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<h3>
Simon Peyton Jones pushed to branch wip/T18603
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b2531f680c4d8e034d0b1936ef975648a2b4462">3b2531f6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-09T16:43:31+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the occurrence analyser
Ticket #18603 demonstrated that the occurrence analyser's
handling of
local RULES for imported Ids
(which I now call IMP-RULES) was inadequate. It led the simplifier
into an infnite loop by failing to label a binder as a loop breaker.
The main change in this commit is to treat IMP-RULES in a simple and
uniform way: as extra rules for the local binder. See
Note [IMP-RULES: local rules for imported functions]
This led to quite a bit of refactoring. The result is still tricky,
but it's much better than before, and better documented I think.
Oh, and it fixes the bug.
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#448d7f6e0151c2014de38dead3a902f511c45b75">
compiler/GHC/Core/FVs.hs
</a>
</li>
<li class="file-stats">
<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
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<li class="file-stats">
<a href="#d1d7de5bc3d2b577ac871114201f27e9ccc2f689">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18603.hs
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</li>
<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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</li>
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<h4>Changes:</h4>
<li id="448d7f6e0151c2014de38dead3a902f511c45b75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b2531f680c4d8e034d0b1936ef975648a2b4462#448d7f6e0151c2014de38dead3a902f511c45b75"><strong>compiler/GHC/Core/FVs.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,16 +10,12 @@ Taken quite directly from the Peyton Jones/Lester paper.</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cd">-- | A module concerned with finding the free variables of an expression.</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Free variables of expressions and binding groups</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVars</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">exprsFreeVars</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIds</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVarsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVarsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIds</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsDSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Selective free variables of expressions</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -126,6 +122,9 @@ exprFreeVarsList = fvVarList . exprFVs</td>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprSomeFreeVars</span> <span class="n" style="color: #333;">isLocalId</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">exprsFreeIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="n" style="color: #333;">exprsFreeIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprsSomeFreeVars</span> <span class="n" style="color: #333;">isLocalId</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"><span class="cd">-- | Find all locally-defined free Ids in an expression</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning a deterministic set.</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIdsDSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<li id="bac3d5159a5688007de3aa3f5c4e50569677b347">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b2531f680c4d8e034d0b1936ef975648a2b4462#bac3d5159a5688007de3aa3f5c4e50569677b347"><strong>compiler/GHC/Core/Opt/OccurAnal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -61,10 +61,15 @@ import Data.List</td>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here's the externally-callable interface:</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do occurrence analysis, and discard occurrence info returned</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">occAnal</span> <span class="n" style="color: #333;">initOccEnv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalysePgm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="c1" style="color: #998; font-style: italic;">-- Used only in debug output</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Active unfoldings</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Active rules</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Local rules for imported Ids</span></span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreProgram</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreProgram</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalysePgm</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">active_unf</span> <span class="n" style="color: #333;">active_rule</span> <span class="n" style="color: #333;">imp_rules</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyDetails</span> <span class="n" style="color: #333;">final_usage</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -95,15 +100,21 @@ occurAnalysePgm this_mod active_unf active_rule imp_rules binds</td>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">initial_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">emptyDetails</span> <span class="p">(</span><span class="n" style="color: #333;">rulesFreeVars</span> <span class="n" style="color: #333;">imp_rules</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The RULES declarations keep things alive!</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">plusVarEnv_C</span> <span class="n" style="color: #333;">unionVarSet</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mapVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="n" style="color: #333;">maps_to</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">getUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeIds</span> <span class="n" style="color: #333;">arg</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">imp_rule</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">imp_rules</span></span>
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103
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isBuiltinRule</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Plugin rules]</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">maps_to</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprFreeIds</span> <span class="p">(</span><span class="n" style="color: #333;">ru_rhs</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="n" style="color: #333;">imp_rule</span></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ru_args</span> <span class="n" style="color: #333;">imp_rule</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_edges maps a top-level local binder 'f' to the</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RHS free vars of any IMP-RULE, a local RULE for an imported function,</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where 'f' appears on the LHS</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. RULE foldr f = blah</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_edges contains f :-> fvs(blah)</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We treat such RULES as extra rules for 'f'</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">plusVarEnv_C</span> <span class="p">(</span><span class="o" style="font-weight: 600;">++</span><span class="p">))</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mapVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="p">[(</span><span class="n" style="color: #333;">act</span><span class="p">,</span><span class="n" style="color: #333;">rhs_fvs</span><span class="p">)])</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getUniqSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">exprsFreeIds</span> <span class="n" style="color: #333;">args</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">act</span><span class="p">,</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ru_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">imp_rules</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not BuiltinRules; see Note [Plugin rules]</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprFreeIds</span> <span class="n" style="color: #333;">rhs</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">]</span></span>
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107
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -115,297 +126,64 @@ occurAnalysePgm this_mod active_unf active_rule imp_rules binds</td>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalBind</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bind</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="n" style="color: #333;">bs_usage</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do occurrence analysis, and discard occurrence info returned</span></span>
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">occAnal</span> <span class="n" style="color: #333;">initOccEnv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Plugin rules]</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conal Elliott (#11651) built a GHC plugin that added some</span></span>
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRules (for imported Ids) to the mg_rules field of ModGuts, to</span></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do some domain-specific transformations that could not be expressed</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an ordinary pattern-matching CoreRule. But then we can't extract</span></span>
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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the dependencies (in imp_rule_edges) from ru_rhs etc, because a</span></span>
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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRule doesn't have any of that stuff.</span></span>
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we simply assume that BuiltinRules have no dependencies, and filter</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them out from the imp_rule_edges comprehension.</span></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bindings</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> IMP-RULES</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Local rules for imported functions</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursive bindings: the grand plan]</span></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we come across a binding group</span></span>
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146
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { x1 = r1; ...; xn = rn }</span></span>
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147
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we treat it like this (occAnalRecBind):</span></span>
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148
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Occurrence-analyse each right hand side, and build a</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "Details" for each binding to capture the results.</span></span>
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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wrap the details in a Node (details, node-id, dep-node-ids),</span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where node-id is just the unique of the binder, and</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dep-node-ids lists all binders on which this binding depends.</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We'll call these the "scope edges".</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Forming the Rec groups].</span></span>
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157
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> All this is done by makeNode.</span></span>
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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Do SCC-analysis on these Nodes. Each SCC will become a new Rec or</span></span>
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161
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NonRec. The key property is that every free variable of a binding</span></span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is accounted for by the scope edges, so that when we are done</span></span>
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> everything is still in scope.</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. For each Cyclic SCC of the scope-edge SCC-analysis in (2), we</span></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> identify suitable loop-breakers to ensure that inlining terminates.</span></span>
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167
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is done by occAnalRec.</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. To do so we form a new set of Nodes, with the same details, but</span></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different edges, the "loop-breaker nodes". The loop-breaker nodes</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have both more and fewer dependencies than the scope edges</span></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Choosing loop breakers])</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More edges: if f calls g, and g has an active rule that mentions h</span></span>
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175
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then we add an edge from f -> h</span></span>
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176
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Fewer edges: we only include dependencies on active rules, on rule</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHSs (not LHSs) and if there is an INLINE pragma only</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> on the stable unfolding (and vice versa). The scope</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges must be much more inclusive.</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">5. The "weak fvs" of a node are, by definition:</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the scope fvs - the loop-breaker fvs</span></span>
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Weak loop breakers], and the nd_weak field of Details</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">6. Having formed the loop-breaker nodes</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Dead code]</span></span>
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dropping dead code for a cyclic Strongly Connected Component is done</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a very simple way:</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the entire SCC is dropped if none of its binders are mentioned</span></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the body; otherwise the whole thing is kept.</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key observation is that dead code elimination happens after</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency analysis: so 'occAnalBind' processes SCCs instead of the</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">original term's binding groups.</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus 'occAnalBind' does indeed drop 'f' in an example like</span></span>
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> letrec f = ...g...</span></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = ...(...g...)...</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...g...</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when 'g' no longer uses 'f' at all (eg 'f' does not occur in a RULE in</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'g'). 'occAnalBind' first consumes 'CyclicSCC g' and then it consumes</span></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'AcyclicSCC f', where 'body_usage' won't contain 'f'.</span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Forming Rec groups]</span></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We put bindings {f = ef; g = eg } in a Rec group if "f uses g"</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and "g uses f", no matter how indirectly. We do a SCC analysis</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an edge f -> g if "f uses g".</span></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">More precisely, "f uses g" iff g should be in scope wherever f is.</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is, g is free in:</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) the rhs 'ef'</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) or the RHS of a rule for f (Note [Rules are extra RHSs])</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> c) or the LHS or a rule for f (Note [Rule dependency info])</span></span>
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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These conditions apply regardless of the activation of the RULE (eg it might be</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inactive in this phase but become active later). Once a Rec is broken up</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it can never be put back together, so we must be conservative.</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The principle is that, regardless of rule firings, every variable is</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">always in scope.</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A RULE for 'f' is like an extra RHS for 'f'. That way the "parent"</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> keeps the specialised "children" alive. If the parent dies</span></span>
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (because it isn't referenced any more), then the children will die</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> too (unless they are already referenced directly).</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To that end, we build a Rec group for each cyclic strongly</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> connected component,</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *treating f's rules as extra RHSs for 'f'*.</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More concretely, the SCC analysis runs on a graph with an edge</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from f -> g iff g is mentioned in</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) f's rhs</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) f's RULES</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> These are rec_edges.</span></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Under (b) we include variables free in *either* LHS *or* RHS of</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the rule. The former might seems silly, but see Note [Rule</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency info]. So in Example [eftInt], eftInt and eftIntFB</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> will be put in the same Rec, even though their 'main' RHSs are</span></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> both non-recursive.</span></span>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The VarSet in a RuleInfo is used for dependency analysis in the</span></span>
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrence analyser. We must track free vars in *both* lhs and rhs.</span></span>
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence use of idRuleVars, rather than idRuleRhsVars in occAnalBind.</span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why both? Consider</span></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = y</span></span>
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = v+4</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then if we substitute y for x, we'd better do so in the</span></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule's LHS too, so we'd better ensure the RULE appears to mention 'x'</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as well as 'v'</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are visible in their own rec group]</span></span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We want the rules for 'f' to be visible in f's right-hand side.</span></span>
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And we'd like them to be visible in other functions in f's Rec</span></span>
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group. E.g. in Note [Specialisation rules] we want f' rule</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be visible in both f's RHS, and fs's RHS.</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This means that we must simplify the RULEs first, before looking</span></span>
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<pre style="margin: 0;">-<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at any of the definitions. This is done by Simplify.simplRecBind,</span></span>
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when it calls addLetIdInfo.</span></span>
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Choosing loop breakers]</span></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Loop breaking is surprisingly subtle. First read the section 4 of</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"Secrets of the GHC inliner". This describes our basic plan.</span></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We avoid infinite inlinings by choosing loop breakers, and</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensuring that a loop breaker cuts each loop.</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Inlining and hs-boot files] in GHC.Core.ToIface, which</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deals with a closely related source of infinite loops.</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fundamentally, we do SCC analysis on a graph. For each recursive</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group we choose a loop breaker, delete all edges to that node,</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">re-analyse the SCC, and iterate.</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what is the graph? NOT the same graph as was used for Note</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Forming Rec groups]! In particular, a RULE is like an equation for</span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'f' that is *always* inlined if it is applicable. We do *not* disable</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rules for loop-breakers. It's up to whoever makes the rules to make</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sure that the rules themselves always terminate. See Note [Rules for</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">recursive functions] in GHC.Core.Opt.Simplify</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence, if</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f's RHS (or its INLINE template if it has one) mentions g, and</span></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g has a RULE that mentions h, and</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h has a RULE that mentions f</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we *must* choose f to be a loop breaker. Example: see Note</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Specialisation rules].</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, take the free variables of f's RHS, and augment it with</span></span>
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all the variables reachable by RULES from those starting points. That</span></span>
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the whole reason for computing rule_fv_env in occAnalBind. (Of</span></span>
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course we only consider free vars that are also binders in this Rec</span></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group.) See also Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when we compute this rule_fv_env, we only consider variables</span></span>
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<pre style="margin: 0;">-<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free in the *RHS* of the rule, in contrast to the way we build the</span></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Rec group in the first place (Note [Rule dependency info])</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that if 'g' has RHS that mentions 'w', we should add w to</span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g's loop-breaker edges. More concretely there is an edge from f -> g</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iff</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) g is mentioned in f's RHS `xor` f's INLINE rhs</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Inline rules])</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) or h is mentioned in f's RHS, and</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g appears in the RHS of an active RULE of h</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or a transitive sequence of active rules starting with h</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "active rules"? See Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that in Example [eftInt], *neither* eftInt *nor* eftIntFB is</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">chosen as a loop breaker, because their RHSs don't mention each other.</span></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And indeed both can be inlined safely.</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note again that the edges of the graph we use for computing loop breakers</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are not the same as the edges we use for computing the Rec blocks.</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's why we compute</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- rec_edges for the Rec block analysis</span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- loop_breaker_nodes for the loop breaker analysis</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this real example from Data Parallel Haskell</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero :: Array Int -> Array Tag</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE [1] tagZeroes #-}</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero xs = pmap (\x -> fromBool (x==0)) xs</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "tagZero" [~1] forall xs n.</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pmap fromBool <blah blah> = tagZero xs #-}</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So tagZero's RHS mentions pmap, and pmap's RULE mentions tagZero.</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, tagZero can only be inlined in phase 1 and later, while</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the RULE is only active *before* phase 1. So there's no problem.</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mapping from a local Id 'f' to info about its IMP-RULES,</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. /local/ rules for an imported Id that mention 'f' on the LHS</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We record (a) its Activation and (b) the RHS free vars</span></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [IMP-RULES: local rules for imported functions]</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To make this work, we look for the RHS free vars only for</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *active* rules. That's the reason for the occ_rule_act field</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the OccEnv.</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Weak loop breakers]</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is a last nasty wrinkle. Suppose we have</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = f_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = h_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = h</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...more...</span></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember that we simplify the RULES before any RHS (see Note</span></span>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Rules are visible in their own rec group] above).</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we must *not* postInlineUnconditionally 'g', even though</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> its RHS turns out to be trivial. (I'm assuming that 'g' is</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not chosen as a loop breaker.) Why not? Because then we</span></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> drop the binding for 'g', which leaves it out of scope in the</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE!</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here's a somewhat different example of the same thing</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { g = h</span></span>
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378
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f...</span></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; f = f_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g }</span></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the RULE is "below" g, but we *still* can't postInlineUnconditionally</span></span>
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382
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g, because the RULE for f is active throughout. So the RHS of h</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might rewrite to h = ...g...</span></span>
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384
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So g must remain in scope in the output program!</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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385
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144
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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386
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We "solve" this by:</span></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">lookupImpRules</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">vs</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Variable mentioned in RHS of an IMP-RULE for the bndr,</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether active or not</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="n" style="color: #333;">imp_rules_info</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">emptyDetails</span> <span class="n" style="color: #333;">imp_rules_info</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">vs</span><span class="p">)</span> <span class="n" style="color: #333;">usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">usage</span> <span class="n" style="color: #333;">vs</span></span>
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387
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158
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Make g a "weak" loop breaker (OccInfo = IAmLoopBreaker True)</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> iff g is a "missing free variable" of the Rec group</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">vs</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">vs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_set</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="p">(</span><span class="n" style="color: #333;">act</span><span class="p">,</span><span class="n" style="color: #333;">vs</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vs</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">acc</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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390
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"></span>
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391
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A "missing free variable" x is one that is mentioned in an RHS or</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> INLINE or RULE of a binding in the Rec group, but where the</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency on x may not show up in the loop_breaker_nodes (see</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> note [Choosing loop breakers} above).</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [IMP-RULES: local rules for imported functions]</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We quite often have</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * A /local/ rule</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * for an /imported/ function</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like this:</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo x = blah</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULE "map/foo" forall xs. map foo xs = xs #-}</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We call them IMP-RULES. They are important in practice, and occur a</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lot in the libraries.</span></span>
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395
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A normal "strong" loop breaker has IAmLoopBreaker False. So</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">IMP-RULES are held in mg_rules of ModGuts, and passed in to</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurAnalysePgm.</span></span>
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180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"></span>
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398
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Inline postInlineUnconditionally</span></span>
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399
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strong IAmLoopBreaker False no no</span></span>
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400
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> weak IAmLoopBreaker True yes no</span></span>
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401
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other yes yes</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Main Invariant:</span></span>
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402
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The **sole** reason for this kind of loop breaker is so that</span></span>
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404
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> postInlineUnconditionally does not fire. Ugh. (Typically it'll</span></span>
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405
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline via the usual callSiteInline stuff, so it'll be dead in the</span></span>
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406
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next pass, so the main Ugh is the tiresome complication.)</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Throughout, we treat an IMP-RULE that mentions 'f' on its LHS</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> just like a RULE for f.</span></span>
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407
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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408
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">Rules for imported function</span>s]</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">IMP-RULES: unavoidable loop</span>s]</span></span>
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409
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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410
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this</span></span>
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411
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = /\a. B.g a</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="428" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -428,14 +206,28 @@ B.g. We could only spot such loops by exhaustively following</td>
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428
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unfoldings of C.h etc, in case we reach B.g, and hence (via the RULE)</span></span>
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429
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f.</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that RULES for imported functions are important in practice; they</span></span>
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432
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occur a lot in the libraries.</span></span>
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433
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We regard this potential infinite loop as a *programmer* error.</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's up the programmer not to write silly rules like</span></span>
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436
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = f x</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the example above is just a more complicated version.</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Specialising imported functions] (referred to from Specialise)</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For *automatically-generated* rules, the programmer can't be</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">responsible for the "programmer error" in Note [IMP-RULES: unavoidable</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loops]. In particular, consider specialising a recursive function</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defined in another module. If we specialise a recursive function B.g,</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g_spec = .....(B.g Int).....</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE B.g Int = g_spec</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, g_spec doesn't look recursive, but when the rule fires, it</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">becomes so. And if B.g was mutually recursive, the loop might not be</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as obvious as it is here.</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid this,</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * When specialising a function that is a loop breaker,</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> give a NOINLINE pragma to the specialised function</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider:</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -501,70 +293,207 @@ And we are in an infinite loop again, except that this time the loop is producin</td>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">infinitely large *term* (an unrolling of filter) and so the simplifier finally</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dies with "ticks exhausted"</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of this problem, we make a small change in the occurrence analyser</span></span>
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505
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">designed to mark functions like "filter" as strong loop breakers on the basis that:</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. The RHS of filter mentions the local function "filterFB"</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. We have a rule which mentions "filterFB" on the LHS and "filter" on the RHS</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SOLUTION: we treat the rule "filterList" as an extra rule for 'filterFB'</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because it mentions 'filterFB' on the LHS. This is the Main Invariant</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [IMP-RULES: local rules for imported functions].</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, during loop-breaker analysis:</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- for each active RULE for a local function 'f' we add an edge bewteen</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'f' and the local FVs of the rule RHS</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- for each active RULE for an *imported* function we add dependency</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges between the *local* FVS of the rule LHS and the *local* FVS of</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the rule RHS.</span></span>
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308
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>
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309
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even with this extra hack we aren't always going to get things</span></span>
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310
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right. For example, it might be that the rule LHS mentions an imported</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Id, and another module has a RULE that can rewrite that imported Id to</span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one of our local Ids.</span></span>
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313
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"></span>
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314
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Plugin rules]</span></span>
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315
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~</span></span>
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316
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conal Elliott (#11651) built a GHC plugin that added some</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRules (for imported Ids) to the mg_rules field of ModGuts, to</span></span>
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318
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do some domain-specific transformations that could not be expressed</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an ordinary pattern-matching CoreRule. But then we can't extract</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the dependencies (in imp_rule_edges) from ru_rhs etc, because a</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRule doesn't have any of that stuff.</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we simply assume that BuiltinRules have no dependencies, and filter</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them out from the imp_rule_edges comprehension.</span></span>
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325
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Glomming]</span></span>
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327
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~</span></span>
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328
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RULES for imported Ids can make something at the top refer to</span></span>
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329
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">something at the bottom:</span></span>
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330
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"></span>
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331
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = ...(B.f @Int)...</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $sf = blah</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE: B.f @Int = $sf</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Applying this rule makes foo refer to $sf, although foo doesn't appear to</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depend on $sf. (And, as in Note [Rules for imported functions], the</span></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency might be more indirect. For example, foo might mention C.t</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather than B.f, where C.t eventually inlines to B.f.)</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NOTICE that this cannot happen for rules whose head is a</span></span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">locally-defined function, because we accurately track dependencies</span></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through RULES. It only happens for rules whose head is an imported</span></span>
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343
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function (B.f in the example above).</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution:</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - When simplifying, bring all top level identifiers into</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> scope at the start, ignoring the Rec/NonRec structure, so</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that when 'h' pops up in f's rhs, we find it in the in-scope set</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as the simplifier generally expects). This happens in simplTopBinds.</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"></span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - In the occurrence analyser, if there are any out-of-scope</span></span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrences that pop out of the top, which will happen after</span></span>
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353
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> firing the rule: f = \x -> h x</span></span>
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354
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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355
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then just glom all the bindings into a single Rec, so that</span></span>
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356
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the *next* iteration of the occurrence analyser will sort</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> them all out. This part happens in occurAnalysePgm.</span></span>
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358
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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361
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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362
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bindings</span></span>
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364
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"></span>
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367
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursive bindings: the grand plan]</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we come across a binding group</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { x1 = r1; ...; xn = rn }</span></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we treat it like this (occAnalRecBind):</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Note [Forming Rec groups]</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Occurrence-analyse each right hand side, and build a</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "Details" for each binding to capture the results.</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wrap the details in a LetrecNode, ready for SCC analysis.</span></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> All this is done by makeNode.</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Do SCC-analysis on these Nodes:</span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Each CyclicSCC will become a new Rec</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Each AcyclicSCC will become a new NonRec</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The key property is that every free variable of a binding is</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> accounted for by the scope edges, so that when we are done</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> everything is still in scope.</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. For each AcyclicSCC, just make a NonRec binding.</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. For each CyclicSCC of the scope-edge SCC-analysis in (2), we</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> identify suitable loop-breakers to ensure that inlining terminates.</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is done by occAnalRec.</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"></span>
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392
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4a To do so we form a new set of Nodes, with the same details, but</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different edges, the "loop-breaker nodes". The loop-breaker nodes</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have both more and fewer dependencies than the scope edges</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Choosing loop breakers])</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More edges: if f calls g, and g has an active rule that mentions h</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then we add an edge from f -> h</span></span>
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399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"></span>
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400
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Fewer edges: we only include dependencies on active rules, on rule</span></span>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHSs (not LHSs) and if there is an INLINE pragma only</span></span>
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402
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> on the stable unfolding (and vice versa). The scope</span></span>
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403
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges must be much more inclusive.</span></span>
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404
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"></span>
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405
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4b. The "weak fvs" of a node are, by definition:</span></span>
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406
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the scope fvs - the loop-breaker fvs</span></span>
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407
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Weak loop breakers], and the nd_weak field of Details</span></span>
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408
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"></span>
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409
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Dead code]</span></span>
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410
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~</span></span>
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411
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dropping dead code for a cyclic Strongly Connected Component is done</span></span>
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412
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a very simple way:</span></span>
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413
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"></span>
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414
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the entire SCC is dropped if none of its binders are mentioned</span></span>
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415
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the body; otherwise the whole thing is kept.</span></span>
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508
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416
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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509
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for each RULE for an *imported* function we are going to add</span></span>
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510
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency edges between the *local* FVS of the rule LHS and the</span></span>
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511
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*local* FVS of the rule RHS. We don't do anything special for RULES on</span></span>
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512
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">local functions because the standard occurrence analysis stuff is</span></span>
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513
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pretty good at getting loop-breakerness correct there.</span></span>
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417
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key observation is that dead code elimination happens after</span></span>
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418
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency analysis: so 'occAnalBind' processes SCCs instead of the</span></span>
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419
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">original term's binding groups.</span></span>
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514
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420
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"></span>
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515
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is important to note that even with this extra hack we aren't always going to get</span></span>
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516
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">things right. For example, it might be that the rule LHS mentions an imported Id,</span></span>
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517
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and another module has a RULE that can rewrite that imported Id to one of our local</span></span>
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518
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ids.</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus 'occAnalBind' does indeed drop 'f' in an example like</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Specialising imported functions] (referred to from Specialise)</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BUT for *automatically-generated* rules, the programmer can't be</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">responsible for the "programmer error" in Note [Rules for imported</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions]. In particular, consider specialising a recursive function</span></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defined in another module. If we specialise a recursive function B.g,</span></span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g_spec = .....(B.g Int).....</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE B.g Int = g_spec</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, g_spec doesn't look recursive, but when the rule fires, it</span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">becomes so. And if B.g was mutually recursive, the loop might</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not be as obvious as it is here.</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> letrec f = ...g...</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = ...(...g...)...</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...g...</span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">To avoid this,</span></span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> * When specialising a function that is a loop breaker,</span></span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> give a NOINLINE pragma to the specialised function</span></span></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">when 'g' no longer uses 'f' at all (eg 'f' does not occur in a RULE in</span></span></span>
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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'g'). 'occAnalBind' first consumes 'CyclicSCC g' and then it consumes</span></span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'AcyclicSCC f', where 'body_usage' won't contain 'f'.</span></span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Glomming]</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RULES for imported Ids can make something at the top refer to something at the bottom:</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x -> B.g (q x)</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Forming Rec groups]</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key point about the "Forming Rec groups" step is that it /preserves</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">scoping/. If 'x' is mentioned, it had better be bound somewhere. So if</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we start with</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = ...h...</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; g = ...f...</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f... }</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can split into SCCs</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = ...h...</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ..f... }</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NonRec { g = ...f... }</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We put bindings {f = ef; g = eg } in a Rec group if "f uses g" and "g</span></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uses f", no matter how indirectly. We do a SCC analysis with an edge</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f -> g if "f mentions g". That is, g is free in:</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) the rhs 'ef'</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) or the RHS of a rule for f, whether active or inactive</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> c) or the LHS or a rule for f, whether active or inactive</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> d) the RHS of an /active/ local IMP-RULE</span></span>
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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [IMP-RULES: local rules for imported functions]</span></span>
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(b) and (c) apply regardless of the activation of the RULE, because even if</span></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the rule is inactive its free variables must be bound. But (d) doesn't need</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to worry about this because IMP-RULES are always notionally at the bottom</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the file.</span></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE: B.g (q x) = h x</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A RULE for 'f' is like an extra RHS for 'f'. That way the "parent"</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> keeps the specialised "children" alive. If the parent dies</span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (because it isn't referenced any more), then the children will die</span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> too (unless they are already referenced directly).</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Applying this rule makes f refer to h, although f doesn't appear to</span></span>
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<pre style="margin: 0;">-<span id="LC546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depend on h. (And, as in Note [Rules for imported functions], the</span></span>
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency might be more indirect. For example, f might mention C.t</span></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather than B.g, where C.t eventually inlines to B.g.)</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So in Example [eftInt], eftInt and eftIntFB will be put in the</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> same Rec, even though their 'main' RHSs are both non-recursive.</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NOTICE that this cannot happen for rules whose head is a</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">locally-defined function, because we accurately track dependencies</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through RULES. It only happens for rules whose head is an imported</span></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function (B.g in the example above).</span></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We must also include inactive rules, so that their free vars</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> remain in scope.</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution:</span></span>
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<pre style="margin: 0;">-<span id="LC556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - When simplifying, bring all top level identifiers into</span></span>
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> scope at the start, ignoring the Rec/NonRec structure, so</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that when 'h' pops up in f's rhs, we find it in the in-scope set</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as the simplifier generally expects). This happens in simplTopBinds.</span></span>
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">+<span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The VarSet in a RuleInfo is used for dependency analysis in the</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrence analyser. We must track free vars in *both* lhs and rhs.</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence use of idRuleVars, rather than idRuleRhsVars in occAnalBind.</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why both? Consider</span></span>
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = y</span></span>
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = v+4</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then if we substitute y for x, we'd better do so in the</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule's LHS too, so we'd better ensure the RULE appears to mention 'x'</span></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as well as 'v'</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - In the occurrence analyser, if there are any out-of-scope</span></span>
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrences that pop out of the top, which will happen after</span></span>
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<pre style="margin: 0;">-<span id="LC563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> firing the rule: f = \x -> h x</span></span>
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564
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then just glom all the bindings into a single Rec, so that</span></span>
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the *next* iteration of the occurrence analyser will sort</span></span>
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567
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> them all out. This part happens in occurAnalysePgm.</span></span>
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487
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are visible in their own rec group]</span></span>
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488
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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489
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We want the rules for 'f' to be visible in f's right-hand side.</span></span>
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490
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And we'd like them to be visible in other functions in f's Rec</span></span>
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491
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group. E.g. in Note [Specialisation rules] we want f' rule</span></span>
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492
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be visible in both f's RHS, and fs's RHS.</span></span>
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493
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"></span>
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494
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This means that we must simplify the RULEs first, before looking</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at any of the definitions. This is done by Simplify.simplRecBind,</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when it calls addLetIdInfo.</span></span>
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497
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"></span>
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Inline rules]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -724,6 +653,13 @@ propagate.</td>
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724
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653
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This appears to be very rare in practice. TODO Perhaps we should gather</span></span>
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654
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> statistics to be sure.</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unfoldings and join points]</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We assume that anything in an unfolding occurs multiple times, since</span></span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unfoldings are often copied (that's the whole point!). But we still</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">need to track tail calls for the purpose of finding join points.</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Adjusting right-hand sides]</span></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="794" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -794,45 +730,50 @@ occAnalNonRecBind env lvl imp_rule_edges bndr rhs body_usage</td>
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- It's mentioned in the body</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_usage<span class="idiff left right">4</span></span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">rhs'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">rhs'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span><span class="p">,</span> <span class="n" style="color: #333;">tagged_bndr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagNonRecBinder</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_usage</span> <span class="n" style="color: #333;">bndr</span></span>
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800
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rule_uds</span></span>
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801
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"></span>
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802
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get the join info from the *new* decision</span></span>
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803
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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804
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742
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_join_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">willBeJoinId_maybe</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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805
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743
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<pre style="margin: 0;"> <span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">is_join_point</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">mb_join_arity</span></span>
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806
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744
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"></span>
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807
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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808
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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809
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"></span>
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745
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Right hand side ---------</span></span>
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810
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"> <span class="n" style="color: #333;">env1</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_join_point</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join point RHSs]</span></span>
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811
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747
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">certainly_inline</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cascading inlines]</span></span>
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812
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748
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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813
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749
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"></span>
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814
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750
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Sources of one-shot information]</span></span>
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815
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env1</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">argOneShots</span> <span class="n" style="color: #333;">dmd</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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753
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"></span>
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817
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<pre style="margin: 0;">-<span id="LC817" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage1</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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818
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<pre style="margin: 0;">-<span id="LC818" class="line" lang="haskell"></span>
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819
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unfoldings</span></span>
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<td class="diff-line-num new new_line" data-linenumber="754" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
754
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Unfolding ---------</span></span>
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755
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unfoldings and join points]</span></span>
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821
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756
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">bndr</span></span>
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822
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<pre style="margin: 0;">-<span id="LC822" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_usage</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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823
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage1</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_usage</span></span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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824
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758
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--<span class="idiff left right"> Rules</span></span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--<span class="idiff left right">------- Rules ---------</span></span></span>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Rules are extra RHSs] and Note [Rule dependency info]</span></span>
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827
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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830
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">andUDs</span> <span class="n" style="color: #333;">rhs_usage2</span> <span class="n" style="color: #333;">rule_uds</span></span>
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831
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage4</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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832
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs_usage3</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">rhs_usage3</span> <span class="n" style="color: #333;">vs</span></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="p">(</span><span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_uds: consider</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- h = ...</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- g = ...</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RULE map g = h</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we want to ensure that h is in scope everwhere</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that g is (since the RULE might turn g into h), so</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we make g mention h.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_rule_uds</span> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">add_rule_uds</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">uds</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"> <span class="n" style="color: #333;">certainly_inline</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cascading inlines]</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occ</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OneOcc</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_in_lam</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NotInsideLam</span><span class="p">,</span> <span class="n" style="color: #333;">occ_n_br</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -846,13 +787,13 @@ occAnalNonRecBind env lvl imp_rule_edges bndr rhs body_usage</td>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For a recursive group, we</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * occ-analyse all the RHSs</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * compute strongly-connected components</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * feed those components to occAnalRec</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">pairs</span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">occAnalRec</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="n" style="color: #333;">sccs</span></span>
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a recursive group, we</span></span>
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<pre style="margin: 0;">-<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * occ-analyse all the RHSs</span></span>
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<pre style="margin: 0;">-<span id="LC853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * compute strongly-connected components</span></span>
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * feed those components to occAnalRec</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"> <span class="n" style="color: #333;">sccs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SCC</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="n" style="color: #333;">sccs</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "occAnalBind.scc" #-}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -866,14 +807,6 @@ occAnalRecBind env lvl imp_rule_edges pairs body_usage</td>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">`</span><span class="n" style="color: #333;">addInScope</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unfoldings and join points]</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We assume that anything in an unfolding occurs multiple times, since unfoldings</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are often copied (that's the whole point!). But we still need to track tail</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls for the purpose of finding join points.</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRec</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -893,8 +826,8 @@ occAnalRec _ lvl (AcyclicSCC (ND { nd_bndr = bndr, nd_rhs = rhs</td>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_uds'</span><span class="p">,</span> <span class="n" style="color: #333;">tagged_bndr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagNonRecBinder</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_uds'</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustRhsUsage</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">willBeJoinId_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tagged_bndr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NonRecursive</span></span></span>
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<pre style="margin: 0;">-<span id="LC897" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_uds'</span> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustRhsUsage</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonRecursive</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">willBeJoinId_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tagged_bndr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Rec case is the interesting one</span></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -910,15 +843,14 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="n" style="color: #333;">details_s</span></span>
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">bndrs</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="n" style="color: #333;">details_s</span></span>
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915
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Choosing loop breakers] for loop_breaker_nodes</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the nodes for the loop-breaker analysis</span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Choosing loop breakers] for loop_breaker_nodes</span></span>
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918
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851
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"> <span class="n" style="color: #333;">final_uds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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852
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">loop_breaker_nodes</span><span class="p">)</span></span>
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921
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">loop_breaker_nodes</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"></span>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -927,8 +859,8 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now reconstruct the cycle</span></span>
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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931
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If weak_fvs is empty, the loop_breaker_nodes will include</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all the edges in the original scope edges [remember,</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- weak_fvs is the difference between scope edges and</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -937,14 +869,151 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exactly that case</span></span>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Loop breaking</span></span>
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Loop breaking</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Choosing loop breakers]</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Loop breaking is surprisingly subtle. First read the section 4 of</span></span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"Secrets of the GHC inliner". This describes our basic plan.</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We avoid infinite inlinings by choosing loop breakers, and</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensuring that a loop breaker cuts each loop.</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Inlining and hs-boot files] in GHC.Core.ToIface, which</span></span>
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886
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deals with a closely related source of infinite loops.</span></span>
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887
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"></span>
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888
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fundamentally, we do SCC analysis on a graph. For each recursive</span></span>
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889
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group we choose a loop breaker, delete all edges to that node,</span></span>
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890
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">re-analyse the SCC, and iterate.</span></span>
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891
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"></span>
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892
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what is the graph? NOT the same graph as was used for Note</span></span>
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893
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Forming Rec groups]! In particular, a RULE is like an equation for</span></span>
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894
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'f' that is *always* inlined if it is applicable. We do *not* disable</span></span>
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895
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rules for loop-breakers. It's up to whoever makes the rules to make</span></span>
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896
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sure that the rules themselves always terminate. See Note [Rules for</span></span>
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897
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">recursive functions] in GHC.Core.Opt.Simplify</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence, if</span></span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f's RHS (or its INLINE template if it has one) mentions g, and</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g has a RULE that mentions h, and</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h has a RULE that mentions f</span></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we *must* choose f to be a loop breaker. Example: see Note</span></span>
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905
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Specialisation rules].</span></span>
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906
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, take the free variables of f's RHS, and augment it with</span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all the variables reachable by RULES from those starting points. That</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the whole reason for computing rule_fv_env in occAnalBind. (Of</span></span>
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910
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course we only consider free vars that are also binders in this Rec</span></span>
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911
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group.) See also Note [Finding rule RHS free vars]</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"></span>
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913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when we compute this rule_fv_env, we only consider variables</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free in the *RHS* of the rule, in contrast to the way we build the</span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Rec group in the first place (Note [Rule dependency info])</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that if 'g' has RHS that mentions 'w', we should add w to</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g's loop-breaker edges. More concretely there is an edge from f -> g</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iff</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) g is mentioned in f's RHS `xor` f's INLINE rhs</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Inline rules])</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) or h is mentioned in f's RHS, and</span></span>
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923
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g appears in the RHS of an active RULE of h</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or a /transitive sequence/ of /active rules/ starting with h</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"></span>
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926
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "active rules"? See Note [Finding rule RHS free vars]</span></span>
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927
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"></span>
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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "transitive sequence"? Because active rules apply</span></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unconditionallly, without checking loop-breaker-ness.</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Loop breaker dependencies].</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that in Example [eftInt], *neither* eftInt *nor* eftIntFB is</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">chosen as a loop breaker, because their RHSs don't mention each other.</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And indeed both can be inlined safely.</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"></span>
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936
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note again that the edges of the graph we use for computing loop breakers</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are not the same as the edges we use for computing the Rec blocks.</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's why we use</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"></span>
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940
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- makeNode for the Rec block analysis</span></span>
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941
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- makeLoopBreakerNodes for the loop breaker analysis</span></span>
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942
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Finding rule RHS free vars]</span></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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945
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this real example from Data Parallel Haskell</span></span>
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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero :: Array Int -> Array Tag</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE [1] tagZeroes #-}</span></span>
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948
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero xs = pmap (\x -> fromBool (x==0)) xs</span></span>
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949
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"></span>
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "tagZero" [~1] forall xs n.</span></span>
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951
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pmap fromBool <blah blah> = tagZero xs #-}</span></span>
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952
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So tagZero's RHS mentions pmap, and pmap's RULE mentions tagZero.</span></span>
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953
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, tagZero can only be inlined in phase 1 and later, while</span></span>
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954
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the RULE is only active *before* phase 1. So there's no problem.</span></span>
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955
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To make this work, we look for the RHS free vars only for</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *active* rules. That's the reason for the occ_rule_act field</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the OccEnv.</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Weak loop breakers]</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is a last nasty wrinkle. Suppose we have</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = f_rhs</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = h_rhs</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = h</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...more...</span></span>
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970
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember that we simplify the RULES before any RHS (see Note</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Rules are visible in their own rec group] above).</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we must *not* postInlineUnconditionally 'g', even though</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> its RHS turns out to be trivial. (I'm assuming that 'g' is</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not chosen as a loop breaker.) Why not? Because then we</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> drop the binding for 'g', which leaves it out of scope in the</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE!</span></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here's a somewhat different example of the same thing</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { g = h</span></span>
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983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f...</span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; f = f_rhs</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g }</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the RULE is "below" g, but we *still* can't postInlineUnconditionally</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g, because the RULE for f is active throughout. So the RHS of h</span></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might rewrite to h = ...g...</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So g must remain in scope in the output program!</span></span>
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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We "solve" this by:</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"></span>
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993
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Make g a "weak" loop breaker (OccInfo = IAmLoopBreaker True)</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> iff g is a "missing free variable" of the Rec group</span></span>
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995
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"></span>
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996
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A "missing free variable" x is one that is mentioned in an RHS or</span></span>
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997
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> INLINE or RULE of a binding in the Rec group, but where the</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency on x may not show up in the loop_breaker_nodes (see</span></span>
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999
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> note [Choosing loop breakers} above).</span></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A normal "strong" loop breaker has IAmLoopBreaker False. So</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Inline postInlineUnconditionally</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strong IAmLoopBreaker False no no</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> weak IAmLoopBreaker True yes no</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other yes yes</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The **sole** reason for this kind of loop breaker is so that</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> postInlineUnconditionally does not fire. Ugh. (Typically it'll</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline via the usual callSiteInline stuff, so it'll be dead in the</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next pass, so the main Ugh is the tiresome complication.)</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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943
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"></span>
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944
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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945
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"></span>
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946
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- All binders</span></span>
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948
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders whose dependencies may be "missing"</span></span>
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949
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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950
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -968,7 +1037,7 @@ recording inlinings for any Ids which aren't marked as "no-inline" as it goes.</td>
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968
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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969
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"></span>
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970
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Return the bindings sorted into a plausible order, and marked with loop breakers.</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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972
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "loopBreakNodes" (ppr nodes) $</span></span>
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973
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">stronglyConnCompFromEdgedVerticesUniqR</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span></span>
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974
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -977,20 +1046,20 @@ loopBreakNodes depth bndr_set weak_fvs nodes binds</td>
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="n" style="color: #333;">loop_break_scc</span> <span class="n" style="color: #333;">scc</span> <span class="n" style="color: #333;">binds</span></span>
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AcyclicSCC</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">mk_non_loop_breaker</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">weak_fvs</span></span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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981
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CyclicSCC</span> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AcyclicSCC</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">nodeBinding</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_non_loop_breaker</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">weak_fvs</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CyclicSCC</span> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VarSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Choose a loop breaker, mark it no-inline,</span></span>
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and call loopBreakNodes on the rest</span></span>
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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"reOrderNodes"</span></span>
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<pre style="margin: 0;">-<span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">node</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"reOrderNodes"</span></span>
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">node</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nodeBinding</span></span> <span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span> <span class="n" style="color: #333;">binds</span></span>
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990
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "reOrderNodes" (vcat [ text "unchosen" <+> ppr unchosen</span></span>
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991
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , text "chosen" <+> ppr chosen_nodes ]) $</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">new_depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">unchosen</span> <span class="o" style="font-weight: 600;">$</span></span>
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993
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_loop_breaker</span></span> <span class="n" style="color: #333;">chosen_nodes</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">new_depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">unchosen</span> <span class="o" style="font-weight: 600;">$</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">nodeBinding</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mk_loop_breaker</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">chosen_nodes</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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994
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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995
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">chosen_nodes</span><span class="p">,</span> <span class="n" style="color: #333;">unchosen</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">chooseLoopBreaker</span> <span class="n" style="color: #333;">approximate_lb</span></span>
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">nd_score</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="n" style="color: #333;">node</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1002,20 +1071,24 @@ reOrderNodes depth bndr_set weak_fvs (node : nodes) binds</td>
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1002
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- After two iterations (d=0, d=1) give up</span></span>
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1003
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and approximate, returning to d=0</span></span>
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1004
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdOccInfo</span><span class="p">`</span> <span class="n" style="color: #333;">strongLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">},</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"><span class="n" style="color: #333;">nodeBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="n" style="color: #333;">nodeBinding</span> <span class="n" style="color: #333;">set_id_occ</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">set_id_occ</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">bndr</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdOccInfo</span><span class="p">`</span> <span class="n" style="color: #333;">occ'</span></span>
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1008
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strongLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1009
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="n" style="color: #333;">tail_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tailCallInfo</span> <span class="p">(</span><span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1010
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1084
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LetrecNode</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Binding</span></span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span></span>
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1012
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1086
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">setIdOccInfo</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">occ'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">bndr</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdOccInfo</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">occ'</span></span>
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1089
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span></span>
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1017
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1090
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">weakLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">weakLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1019
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1092
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"> <span class="n" style="color: #333;">tail_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tailCallInfo</span> <span class="p">(</span><span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1020
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1093
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"></span>
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1021
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1178,11 +1251,6 @@ ToDo: try using the occurrence info for the inline'd binder.</td>
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1178
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1251
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1179
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1252
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1180
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1253
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"></span>
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1181
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Mapping from FVs of imported RULE LHSs to RHS FVs</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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1184
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"></span>
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1186
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1254
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Node</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span> <span class="c1" style="color: #998; font-style: italic;">-- Node comes from Digraph</span></span>
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1187
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Unique key is gotten from the Id</span></span>
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1188
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1256
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1209,7 +1277,8 @@ data Details</td>
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1209
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- dependencies might not be respected by loop_breaker_nodes</span></span>
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1210
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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1211
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Free variables of the RHS of active RULES</span></span>
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Variables bound in this Rec group that are free</span></span>
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the RHS of an active rule for this bndr</span></span>
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"></span>
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NodeScore</span></span>
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1289" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1220,7 +1289,7 @@ instance Outputable Details where</td>
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1220
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"uds ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_uds</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1221
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1290
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"inl ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_inl</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1222
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1291
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"weak ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_weak</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1223
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rule ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1292
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<pre style="margin: 0;">+<span id="LC1292" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rule<span class="idiff left right">_rvs</span> ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1293
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<pre style="margin: 0;"> <span id="LC1293" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"score ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_score</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1225
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1294
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<pre style="margin: 0;"> <span id="LC1294" class="line" lang="haskell"> <span class="p">])</span></span>
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1295
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<pre style="margin: 0;"> <span id="LC1295" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1241" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1241,7 +1310,9 @@ makeNode :: OccEnv -> ImpRuleEdges -> VarSet</td>
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span></span>
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1242
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1311
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<pre style="margin: 0;"> <span id="LC1311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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1243
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<pre style="margin: 0;"> <span id="LC1312" class="line" lang="haskell"><span class="n" style="color: #333;">makeNode</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr_set</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="n" style="color: #333;">details</span> <span class="p">(</span><span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">node_fvs</span><span class="p">)</span></span>
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1313
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<pre style="margin: 0;">+<span id="LC1313" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="p">{</span> <span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">details</span></span>
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1314
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">bndr</span></span>
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1315
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<pre style="margin: 0;">+<span id="LC1315" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_dependencies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">node_fvs</span> <span class="p">}</span></span>
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1316
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<pre style="margin: 0;"> <span id="LC1316" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use nonDetKeysUniqSet here as stronglyConnCompFromEdgedVerticesR</span></span>
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1246
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1317
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<pre style="margin: 0;"> <span id="LC1317" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is still deterministic with edges in nondeterministic order as</span></span>
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1247
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1318
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<pre style="margin: 0;"> <span id="LC1318" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- explained in Note [Deterministic SCC] in GHC.Data.Graph.Directed.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1249" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1249,7 +1320,7 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1249
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr'</span></span>
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1250
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span></span>
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1251
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1322
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs'</span></span>
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1252
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<pre style="margin: 0;">-<span id="LC1252" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage<span class="idiff left right">3</span></span></span>
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1323
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage</span></span>
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1253
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1324
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_inl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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1254
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_weak</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">node_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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1255
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">active_rule_fvs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1258" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1258,6 +1329,11 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1258
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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1331
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rule_uds</span></span>
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">+<span id="LC1334" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">+<span id="LC1335" class="line" lang="haskell"> <span class="n" style="color: #333;">node_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage</span></span>
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1336
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<pre style="margin: 0;">+<span id="LC1336" class="line" lang="haskell"></span>
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1261
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<pre style="margin: 0;"> <span id="LC1337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get join point info from the *current* decision</span></span>
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1262
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<pre style="margin: 0;"> <span id="LC1338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't know what the new decision will be!</span></span>
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1339
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Using the old decision at least allows us to</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1265,66 +1341,68 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1265
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1341
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<pre style="margin: 0;"> <span id="LC1341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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1266
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1342
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<pre style="margin: 0;"> <span id="LC1342" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_join_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">bndr</span></span>
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1267
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1343
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="haskell"></span>
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1344
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<pre style="margin: 0;">+<span id="LC1344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Right hand side ---------</span></span>
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1268
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1345
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constructing the edges for the main Rec computation</span></span>
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1269
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1346
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Forming Rec groups]</span></span>
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1270
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage1</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body'</span></span>
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1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">andUDs</span> <span class="n" style="color: #333;">rhs_usage1</span> <span class="n" style="color: #333;">rule_uds</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1276
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<pre style="margin: 0;">-<span id="LC1276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rules are extra RHSs]</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rule dependency info]</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">node_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage3</span></span>
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1347
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not use occAnalRhs because we don't yet know</span></span>
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1348
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the final answer for mb_join_arity</span></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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1350
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span></span>
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1352
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body'</span></span>
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1353
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"></span>
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1354
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Unfolding ---------</span></span>
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1355
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unfoldings and join points]</span></span>
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1356
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">bndr</span> <span class="c1" style="color: #998; font-style: italic;">-- realIdUnfolding: Ignore loop-breaker-ness</span></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because that is what we are setting!</span></span>
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1358
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">Recursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_uds</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">inl_uds</span></span>
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1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inl_fvs: the vars that would become free if the function was inlined;</span></span>
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1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- usually that means the RHS, unless the unfolding is a stable one.</span></span>
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1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: We could do this only for functions with an *active* unfolding</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (returning emptyVarSet for an inactive one), but is_active</span></span>
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1366
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- isn't the right thing (it tells about RULE activation),</span></span>
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1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we'd need more plumbing</span></span>
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1279
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1368
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finding the free variables of the rules</span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"> <span class="n" style="color: #333;">is_active</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ_rule_act</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1282
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"></span>
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1370
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- IMP-RULES --------</span></span>
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"> <span class="n" style="color: #333;">is_active</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ_rule_act</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span></span>
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1373
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="n" style="color: #333;">imp_rule_info</span></span>
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1374
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">imp_rule_info</span></span>
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1375
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- All rules --------</span></span>
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1283
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1377
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">)]</span></span>
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1284
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1378
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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1379
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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1285
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1380
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"></span>
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1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"></span>
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1288
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_rhs_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- Find the RHS fvs</span></span>
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1289
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_rhs_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ids</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">AlwaysActive</span><span class="p">,</span> <span class="n" style="color: #333;">ids</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="p">))</span></span>
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1290
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1291
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<pre style="margin: 0;">-<span id="LC1291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">-<span id="LC1292" class="line" lang="haskell"> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">ru_act</span> <span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span></span>
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1293
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<pre style="margin: 0;">-<span id="LC1293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rules_w_uds</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">-<span id="LC1295" class="line" lang="haskell"> <span class="n" style="color: #333;">active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unionVarSets</span> <span class="p">[</span><span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rules_w_rhs_fvs</span></span>
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<pre style="margin: 0;">-<span id="LC1296" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_rule_uds</span> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"> <span class="n" style="color: #333;">add_rule_uds</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">uds</span></span>
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1298" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finding the usage details of the INLINE pragma (if any)</span></span>
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1299
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<pre style="margin: 0;">-<span id="LC1299" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">bndr</span> <span class="c1" style="color: #998; font-style: italic;">-- realIdUnfolding: Ignore loop-breaker-ness</span></span>
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1300
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<pre style="margin: 0;">-<span id="LC1300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because that is what we are setting!</span></span>
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<pre style="margin: 0;">-<span id="LC1301" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"> <span class="n" style="color: #333;">active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_active_rule</span> <span class="n" style="color: #333;">imp_rule_fvs</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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1385
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"> <span class="n" style="color: #333;">add_active_rule</span> <span class="p">(</span><span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_active</span> <span class="p">(</span><span class="n" style="color: #333;">ruleActivation</span> <span class="n" style="color: #333;">rule</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvs</span></span>
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1302
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1390
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<pre style="margin: 0;"> <span id="LC1390" class="line" lang="haskell"></span>
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1303
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<pre style="margin: 0;">-<span id="LC1303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find the "nd_inl" free vars; for the loop-breaker phase</span></span>
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1304
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<pre style="margin: 0;">-<span id="LC1304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These are the vars that would become free if the function</span></span>
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1305
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<pre style="margin: 0;">-<span id="LC1305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- was inlinined; usually that means the RHS, unless the</span></span>
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1306
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<pre style="margin: 0;">-<span id="LC1306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unfolding is a stable one.</span></span>
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1307
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<pre style="margin: 0;">-<span id="LC1307" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: We could do this only for functions with an *active* unfolding</span></span>
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1308
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<pre style="margin: 0;">-<span id="LC1308" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (returning emptyVarSet for an inactive one), but is_active</span></span>
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1309
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<pre style="margin: 0;">-<span id="LC1309" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- isn't the right thing (it tells about RULE activation),</span></span>
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1310
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we'd need more plumbing</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_fvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1312
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage1</span></span>
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1313
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1391
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"></span>
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1314
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1392
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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1315
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<pre style="margin: 0;">-<span id="LC1315" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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1316
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- for BODY of let</span></span>
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1317
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Details</span><span class="p">]</span></span>
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1318
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- adjusted</span></span>
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1319
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1396
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">])</span></span>
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1320
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does four things</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function primarily creates the Nodes for the</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- loop-breaker SCC analysis. More specifically:</span></span>
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1321
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a) tag each binder with its occurrence info</span></span>
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1322
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1400
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) add a NodeScore to each node</span></span>
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1323
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1401
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<pre style="margin: 0;"> <span id="LC1401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- c) make a Node with the right dependency edges for</span></span>
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1324
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the loop-breaker SCC analysis</span></span>
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1325
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1403
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- d) adjust each RHS's usage details according to</span></span>
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1326
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the binder's (new) shotness and join-point-hood</span></span>
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1327
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">b<span class="idiff left">ndr_set</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">b</span>ody_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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1328
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"mkLoopBreakerNodes"</span> <span class="n" style="color: #333;">mk_lb_node</span> <span class="n" style="color: #333;">details_s</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span></span>
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1329
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1330
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1334,28 +1412,46 @@ mkLoopBreakerNodes env lvl bndr_set body_uds details_s</td>
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1334
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1412
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span> <span class="p">]</span></span>
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1335
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"></span>
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1336
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_lb_node</span> <span class="n" style="color: #333;">nd</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_inl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inl_fvs</span> <span class="p">})</span> <span class="n" style="color: #333;">new_bndr</span></span>
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1337
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="n" style="color: #333;">nd'</span> <span class="p">(</span><span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">old_bndr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">lb_deps</span><span class="p">)</span></span>
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1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="p">{</span> <span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_nd</span></span>
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">old_bndr</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_dependencies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">lb_deps</span> <span class="p">}</span></span>
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1338
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use nonDetKeysUniqSet here as</span></span>
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1339
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- stronglyConnCompFromEdgedVerticesR is still deterministic with edges</span></span>
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1340
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in nondeterministic order as explained in</span></span>
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1341
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Deterministic SCC] in GHC.Data.Graph.Directed.</span></span>
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1342
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1343
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"> <span class="n" style="color: #333;">n<span class="idiff left">d'</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nd</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">score</span> <span class="p">}</span></span>
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1344
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<pre style="margin: 0;">-<span id="LC1344" class="line" lang="haskell"> <span class="n" style="color: #333;">score</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nodeScore</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">lb_deps</span> <span class="n" style="color: #333;">nd</span></span>
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="n" style="color: #333;">n<span class="idiff left right">ew_nd</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nd</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">score</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="n" style="color: #333;">score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nodeScore</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">lb_deps</span> <span class="n" style="color: #333;">nd</span></span>
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1345
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"> <span class="n" style="color: #333;">lb_deps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendFvs_</span> <span class="n" style="color: #333;">rule_fv_env</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Loop breaker dependencies]</span></span>
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span></span>
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maps a variable f to the variables from this group</span></span>
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1350
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<pre style="margin: 0;">-<span id="LC1350" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mentioned in RHS of active rules for f</span></span>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Domain is *subset* of bound vars (others have no rule fvs)</span></span>
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1352
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<pre style="margin: 0;">-<span id="LC1352" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transClosureFV</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarEnv</span> <span class="n" style="color: #333;">init_rule_fvs</span><span class="p">)</span></span>
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1353
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"> <span class="n" style="color: #333;">init_rule_fvs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">-<span id="LC1354" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span><span class="p">)</span></span>
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1355
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span></span>
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1356
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<pre style="margin: 0;">-<span id="LC1356" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_set</span></span>
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1357
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<pre style="margin: 0;">-<span id="LC1357" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maps a variable f to the variables from this group</span></span>
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reachable by a sequence of RULES starting with f</span></span>
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Domain is *subset* of bound vars (others have no rule fvs)</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why transClosureFV? See Note [Loop breaker dependencies]</span></span>
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transClosureFV</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">rule_fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span></span>
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">rule_fvs</span><span class="p">)</span> <span class="p">]</span></span>
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1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"></span>
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1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Loop breaker dependencies]</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The loop breaker dependencies of x in a recursive</span></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group { f1 = e1; ...; fn = en } are:</span></span>
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1358
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"></span>
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1444
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- The "inline free variables" of f: the fi free in</span></span>
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1445
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> either f's unfolding (if f has a stable unfolding)</span></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of f's RHS (if not)</span></span>
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1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- Any fi reachable from those inline free variables by a sequence</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of RULE rewrites. Remember, rule rewriting is not affected</span></span>
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1450
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by fi being a loop breaker, so we have to take the transitive</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> closure in case f is the only possible loop breaker in the loop.</span></span>
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1452
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"></span>
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1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence rule_fv_env. We need only account for /active/ rules.</span></span>
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1454
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1359
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1455
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"></span>
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1360
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1456
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
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1361
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1457
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"><span class="n" style="color: #333;">nodeScore</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1567,29 +1663,31 @@ Hence the is_lb field of NodeScore</td>
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1567
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1663
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1568
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1664
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1569
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1570" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span></span>
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1666
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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span></span>
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1571
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1667
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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1572
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1573" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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1574
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="p">(</span><span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span></span>
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_bndrs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;">is_rec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a /non-recursive/ join point we can mark all</span></span>
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its join-lambda as one-shot; and it's a good idea to do so</span></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Final adjustment</span></span>
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonRecursive</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bndrs'</span></span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mb_join_arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">final_bndrs</span></span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1582" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rhs</span>'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1679" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">mkLams</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">final_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">body</span>'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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1682
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span></span>
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RecFlag</span></span>
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1587
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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1588
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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1589
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span><span class="p">)</span></span>
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1590
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Occurrence-analyse a stable unfolding;</span></span>
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- discard a non-stable one altogether.</span></span>
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<pre style="margin: 0;">-<span id="LC1592" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unf</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableSource</span> <span class="n" style="color: #333;">src</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1600,7 +1698,7 @@ occAnalUnfolding env mb_join_arity unf</td>
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to guide its decisions. It's ok to leave un-substituted</span></span>
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expressions in the tree because all the variables that were in</span></span>
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- scope remain in scope; there is no cloning etc.</span></span>
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<pre style="margin: 0;">-<span id="LC1603" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"></span>
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1605
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1703
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"> <span class="n" style="color: #333;">unf'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">noBinderSwaps</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unfoldings and rules]</span></span>
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1606
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1897" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1995" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1897,7 +1995,7 @@ occAnalApp env (Var fun, args, ticks)</td>
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1897
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1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This caused #18296</span></span>
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1898
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<td class="diff-line-num new_line" data-linenumber="1996" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1996
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<pre style="margin: 0;"> <span id="LC1996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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1899
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<td class="diff-line-num new_line" data-linenumber="1997" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1997
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<pre style="margin: 0;"> <span id="LC1997" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1900" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1900
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<td class="diff-line-num new_line old" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1901" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NonRecursive</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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1901
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<td class="diff-line-num new_line" data-linenumber="1999" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">mkTicks</span> <span class="n" style="color: #333;">ticks</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">])</span></span>
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1902
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2000
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<pre style="margin: 0;"> <span id="LC2000" class="line" lang="haskell"></span>
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1903
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2001
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<pre style="margin: 0;"> <span id="LC2001" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalApp</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ticks</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2233,6 +2331,7 @@ addAppCtxt :: OccEnv -> [Arg CoreBndr] -> OccEnv</td>
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2233
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2331
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<pre style="margin: 0;"> <span id="LC2331" class="line" lang="haskell"><span class="n" style="color: #333;">addAppCtxt</span> <span class="n" style="color: #333;">env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">})</span> <span class="n" style="color: #333;">args</span></span>
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2234
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2332
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<pre style="margin: 0;"> <span id="LC2332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">valArgCount</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">}</span></span>
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2235
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2333
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<pre style="margin: 0;"> <span id="LC2333" class="line" lang="haskell"></span>
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2334
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<pre style="margin: 0;">+<span id="LC2334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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2236
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2335
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<pre style="margin: 0;"> <span id="LC2335" class="line" lang="haskell"><span class="n" style="color: #333;">transClosureFV</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2237
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2336
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<pre style="margin: 0;"> <span id="LC2336" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (f,g), (g,h) are in the input, then (f,h) is in the output</span></span>
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2238
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2337
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<pre style="margin: 0;"> <span id="LC2337" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as well as (f,g), (g,h)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2643" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2742" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2643,7 +2742,10 @@ v `usedIn` ud = isExportedId v || v `elemVarEnv` ud_env ud</td>
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2643
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2742
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<pre style="margin: 0;"> <span id="LC2742" class="line" lang="haskell"></span>
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2644
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2743
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<pre style="margin: 0;"> <span id="LC2743" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2645
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2744
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<pre style="margin: 0;"> <span id="LC2744" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Find the subset of bndrs that are mentioned in uds</span></span>
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2646
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<pre style="margin: 0;">-<span id="LC2646" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictUniqSetToUFM</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">ud_env</span> <span class="n" style="color: #333;">ud</span><span class="p">)</span></span>
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2745
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<pre style="margin: 0;">+<span id="LC2745" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">ud_env</span> <span class="n" style="color: #333;">ud</span><span class="p">)</span></span>
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2746
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<pre style="margin: 0;">+<span id="LC2746" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2747" class="line" lang="haskell"><span class="n" style="color: #333;">restrictFreeVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OccInfoEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2748
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<pre style="margin: 0;">+<span id="LC2748" class="line" lang="haskell"><span class="n" style="color: #333;">restrictFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictUniqSetToUFM</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">fvs</span></span>
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2647
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2749
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<pre style="margin: 0;"> <span id="LC2749" class="line" lang="haskell"></span>
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2648
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2750
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not mark CoVars as dead]</span></span>
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2649
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2712,20 +2814,20 @@ flattenUsageDetails ud</td>
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2814
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<pre style="margin: 0;"> <span id="LC2814" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------</span></span>
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<pre style="margin: 0;"> <span id="LC2816" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Adjusting right-hand sides]</span></span>
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<pre style="margin: 0;">-<span id="LC2715" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">JoinArity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">RecFlag</span></span></span>
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<pre style="margin: 0;">+<span id="LC2817" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">JoinArity</span></span></span>
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<pre style="margin: 0;"> <span id="LC2818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Outer lambdas, AFTER occ anal</span></span>
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2819
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- From body of lambda</span></span>
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2820
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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<pre style="margin: 0;">-<span id="LC2719" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rec_flag</span></span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">usage</span></span>
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<pre style="margin: 0;">-<span id="LC2720" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllInsideLamIf</span> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shot</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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2821
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<pre style="margin: 0;">+<span id="LC2821" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_join_arity</span></span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">usage</span></span>
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2822
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<pre style="margin: 0;">+<span id="LC2822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllInsideLamIf</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shot</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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2721
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2823
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<pre style="margin: 0;"> <span id="LC2823" class="line" lang="haskell"> <span class="n" style="color: #333;">markAllNonTailIf</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">exact_join</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2722
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2824
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<pre style="margin: 0;"> <span id="LC2824" class="line" lang="haskell"> <span class="n" style="color: #333;">usage</span></span>
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2723
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2825
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<pre style="margin: 0;"> <span id="LC2825" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2724
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2826
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<pre style="margin: 0;"> <span id="LC2826" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2725
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2827
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<pre style="margin: 0;"> <span id="LC2827" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">join_arity</span></span>
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2726
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<pre style="margin: 0;">-<span id="LC2726" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_flag</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2727
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<pre style="margin: 0;">-<span id="LC2727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="p">(</span><span class="n" style="color: #333;">drop</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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2728
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<pre style="margin: 0;">-<span id="LC2728" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="n" style="color: #333;">bndrs</span></span>
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2828
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<pre style="margin: 0;">+<span id="LC2828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;"><span class="idiff left right">is_rec</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2829
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<pre style="margin: 0;">+<span id="LC2829" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="p">(</span><span class="n" style="color: #333;">drop</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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2830
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<pre style="margin: 0;">+<span id="LC2830" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="n" style="color: #333;">bndrs</span></span>
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2729
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2831
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<pre style="margin: 0;"> <span id="LC2831" class="line" lang="haskell"></span>
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2730
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2832
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<pre style="margin: 0;"> <span id="LC2832" class="line" lang="haskell"> <span class="n" style="color: #333;">exact_join</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exactJoin</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs</span></span>
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2731
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2833
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<pre style="margin: 0;"> <span id="LC2833" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2908" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2806,7 +2908,7 @@ tagRecBinders lvl body_uds triples</td>
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2806
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2908
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- join-point-hood decision</span></span>
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2807
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2909
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<pre style="margin: 0;"> <span id="LC2909" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_udss'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">adjust</span> <span class="n" style="color: #333;">triples</span></span>
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2808
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2910
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<pre style="margin: 0;"> <span id="LC2910" class="line" lang="haskell"> <span class="n" style="color: #333;">adjust</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_bndrs</span><span class="p">)</span></span>
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2809
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<pre style="margin: 0;">-<span id="LC2809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Recursive</span></span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;">+<span id="LC2911" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Recursive</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_join_arity</span></span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;"> <span id="LC2912" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2913" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can't use willBeJoinId_maybe here because we haven't tagged the</span></span>
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<pre style="margin: 0;"> <span id="LC2914" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- binder yet (the tag depends on these adjustments!)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b2531f680c4d8e034d0b1936ef975648a2b4462#d1d7de5bc3d2b577ac871114201f27e9ccc2f689"><strong>testsuite/tests/simplCore/should_compile/T18603.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NoImplicitPrelude #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Test</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">build</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rs</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE [1] mapMaybe #-}</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# RULES</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">"mapMaybe" [~1] forall f xs. mapMaybe f xs</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> = build (\c n -> foldr (mapMaybeFB c f) n xs)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">"mapMaybeList" [1] forall f. foldr (mapMaybeFB (:) f) [] = mapMaybe f</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> #-}</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE [0] mapMaybeFB #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Inline FB functions] in GHC.List</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybeFB</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybeFB</span> <span class="n" style="color: #333;">cons</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">next</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cons</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">next</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b2531f680c4d8e034d0b1936ef975648a2b4462#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -333,3 +333,4 @@ test('T18347', normal, compile, ['-dcore-lint -O'])</td>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18355</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">OneShot</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -ddump-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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334
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334
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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335
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335
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18589</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18603</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span></pre>
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