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<h3>
Sebastian Graf pushed to branch wip/nested-cpr-2019
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d913847bfdc5531f55cf7817f48b1d01d8ef905c">d913847b</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-05-05T10:58:47+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Prune CPR sigs to constant depth on all bindings
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<h4>1 changed file:</h4>
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compiler/GHC/Core/Opt/CprAnal.hs
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<h4>Changes:</h4>
<li id="c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d913847bfdc5531f55cf7817f48b1d01d8ef905c#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b"><strong>compiler/GHC/Core/Opt/CprAnal.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">@@ -311,21 +311,24 @@ cprFix top_lvl env str orig_pairs</td>
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id1</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;">cprAnalBind</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">str</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"> <span class="n" style="color: #333;">id2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdCprInfo</span> <span class="n" style="color: #333;">id1</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">pruneSig</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mAX_DEPTH</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idCprInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id1</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"> <span class="n" style="color: #333;">id2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdCprInfo</span> <span class="n" style="color: #333;">id1</span> <span class="o" style="font-weight: 600;"><span class="idiff left">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pruneSig</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mAX_DEPTH</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">markDiverging</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">idCprInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">id1</span></span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendAnalEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id2</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"><span class="n" style="color: #333;">mAX_DEPTH</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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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"><span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">4</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: We need the lubCpr with the initial CPR because</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of functions like iterate, which we would CPR</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- multiple levels deep, thereby changing termination</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- behavior.</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="n" style="color: #333;">markDiverging</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"><span class="n" style="color: #333;">markDiverging</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">`</span><span class="n" style="color: #333;">lubCpr</span><span class="p">`</span> <span class="n" style="color: #333;">divergeCpr</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"><span class="cd">-- | A widening operator on 'CprSig' to ensure termination of fixed-point</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- iteration. See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</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;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span></span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: We need the lubCpr with the initial CPR because</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of functions like iterate, which we would CPR</span></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- multiple levels deep, thereby changing termination</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- behavior.</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneDeepCpr</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">`</span><span class="n" style="color: #333;">lubCpr</span><span class="p">`</span> <span class="n" style="color: #333;">divergeCpr</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneDeepCpr</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnboxingStrategy</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">dmd</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">@@ -378,7 +381,8 @@ cprAnalBind top_lvl env args id rhs</td>
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<pre style="margin: 0;"> <span id="LC381" 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_ty</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming for CPR signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCprSigForArity</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty'</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We prune so that we discard too deep info on e.g. TyCon bindings</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkCprSigForArity</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty'</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "cprAnalBind" (ppr id $$ ppr sig) $</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"> <span class="n" style="color: #333;">setIdCprInfo</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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