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<h3>
Ben Gamari pushed to branch wip/T16846
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/fa34f0f7aa83dfb3360f4ee56c56292f8a38da15">fa34f0f7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T03:54:57Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreToStg: Enable CAFfyness checking with -dstg-lint
The debugging involved in finding #16846 wouldn't have been necessary
had the consistentCafInfo check been enabled. However, :wq
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/b7a1d0d5dc105f89c1e904fadf8b67d223807c2e">b7a1d0d5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T03:54:57Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't eta-expand unsaturated primops
Previously, as described in Note [Primop wrappers], `hasNoBinding` would
return False in the case of `PrimOpId`s. This would result in eta
expansion of unsaturated primop applications during CorePrep. Not only
did this expansion result in unnecessary allocations, but it also meant
lead to rather nasty inconsistencies between the CAFfy-ness
determinations made by TidyPgm and CorePrep.
This fixes #16846.
</pre>
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<h4>8 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#2c842f2f15e67826dc12cc363525b56acb7b7882">
compiler/basicTypes/Id.hs
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<li class="file-stats">
<a href="#1ef63daa170c0d10cdfbb059b08e3ae2f7bec600">
compiler/basicTypes/Unique.hs
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<li class="file-stats">
<a href="#f50439b73583d5fc97ab8917b6fc66f6188a1e62">
compiler/coreSyn/CorePrep.hs
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<li class="file-stats">
<a href="#6c14b513ade9b691d4a805f6a7de89634d3863ae">
compiler/main/TidyPgm.hs
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<li class="file-stats">
<a href="#f171fcd6a9b405926ab6c9973ca110af70daef3b">
compiler/prelude/PrelInfo.hs
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<li class="file-stats">
<a href="#7b2a3c8a780cfa42412ee2700454599d02c3f69d">
compiler/prelude/PrelNames.hs
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<li class="file-stats">
<a href="#9715ddba4708ba02dac192a1f72fa50717761aff">
compiler/prelude/PrimOp.hs
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<li class="file-stats">
<a href="#268617cbbb60bb1447a471b156b77fb5b7ff05cc">
compiler/stgSyn/CoreToStg.hs
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</li>
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<h4>Changes:</h4>
<li id="2c842f2f15e67826dc12cc363525b56acb7b7882">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#2c842f2f15e67826dc12cc363525b56acb7b7882"><strong>compiler/basicTypes/Id.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">@@ -524,9 +524,17 @@ hasNoBinding :: Id -> Bool</td>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Data constructor workers used to be things of this kind, but</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- they aren't any more. Instead, we inject a binding for</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- them at the CorePrep stage.</span></span>
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<pre style="margin: 0;">+<span id="LC527" 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="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PrimOpId's also used to be of this kind. See Note [Primop wrappers] in PrimOp.hs.</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for the history of this.</span></span>
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<pre style="margin: 0;">+<span id="LC530" 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="LC531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that CorePrep currently eta expands things no-binding things and this</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can cause quite subtle bugs. See Note [Eta expansion of hasNoBinding things</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in CorePrep] in CorePrep for details.</span></span>
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<pre style="margin: 0;">+<span id="LC534" 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="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- EXCEPT: unboxed tuples, which definitely have no binding</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="n" style="color: #333;">hasNoBinding</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">idDetails</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">True</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Primop wrappers]</span></span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Primop wrappers] in PrimOp.hs</span></span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FCallId</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataConWorkId</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isUnboxedTupleCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnboxedSumCon</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isCompulsoryUnfolding</span> <span class="p">(</span><span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">id</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">@@ -570,19 +578,6 @@ The easiest way to do this is for hasNoBinding to return True of all things</td>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that have compulsory unfolding. Some Ids with a compulsory unfolding also</span></span>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have a binding, but it does not harm to say they don't here, and its a very</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simple way to fix #14561.</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Primop wrappers]</span></span>
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<pre style="margin: 0;">-<span id="LC575" 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="LC576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently hasNoBinding claims that PrimOpIds don't have a curried</span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function definition. But actually they do, in GHC.PrimopWrappers,</span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is auto-generated from prelude/primops.txt.pp. So actually, hasNoBinding</span></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">could return 'False' for PrimOpIds.</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we'd need to add something in CoreToStg to swizzle any unsaturated</span></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications of GHC.Prim.plusInt# to GHC.PrimopWrappers.plusInt#.</span></span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Nota Bene: GHC.PrimopWrappers is needed *regardless*, because it's</span></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">used by GHCi, which does not implement primops direct at all.</span></span>
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<pre style="margin: 0;"> <span id="LC581" 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="LC582" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"><span class="n" style="color: #333;">isDeadBinder</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;">Bool</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#1ef63daa170c0d10cdfbb059b08e3ae2f7bec600"><strong>compiler/basicTypes/Unique.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">@@ -46,7 +46,7 @@ module Unique (</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- now all the built-in Uniques (and functions to make them)</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [the Oh-So-Wonderful Haskell module system wins again...]</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAlphaTyVarUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPrimOpIdUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPrimOpIdUnique</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">mkPrimOpWrapperUnique</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPreludeMiscIdUnique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPreludeDataConUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPreludeTyConUnique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPreludeClassUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkCoVarUnique</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">@@ -368,6 +368,8 @@ mkPreludeClassUnique :: Int -> Unique</td>
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368
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"><span class="n" style="color: #333;">mkPreludeTyConUnique</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;">Unique</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"><span class="n" style="color: #333;">mkPreludeDataConUnique</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimOpIdUnique</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;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Primop wrappers] in PrimOp.hs.</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimOpWrapperUnique</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;">Unique</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">mkPreludeMiscIdUnique</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;">Unique</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="n" style="color: #333;">mkCoVarUnique</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;">Unique</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"></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">@@ -405,7 +407,8 @@ dataConWorkerUnique u = incrUnique u</td>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"><span class="n" style="color: #333;">dataConTyRepNameUnique</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">stepUnique</span> <span class="n" style="color: #333;">u</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC409" 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="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimOpIdUnique</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnique</span> <span class="sc" style="color: #d14;">'9'</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimOpIdUnique</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnique</span> <span class="sc" style="color: #d14;">'9'</span> <span class="p">(</span><span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">op</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimOpWrapperUnique</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnique</span> <span class="sc" style="color: #d14;">'9'</span> <span class="p">(</span><span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">op</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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412
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnique</span> <span class="sc" style="color: #d14;">'0'</span> <span class="n" style="color: #333;">i</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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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The "tyvar uniques" print specially nicely: a, b, c, etc.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#f50439b73583d5fc97ab8917b6fc66f6188a1e62"><strong>compiler/coreSyn/CorePrep.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">@@ -71,7 +71,7 @@ import qualified Data.Set as S</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The goal of this pass is to prepare for code generation.</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Saturate constructor a<span class="idiff left right">nd primop a</span>pplications.</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Saturate constructor applications.</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Convert to A-normal form; that is, function arguments</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are always variables.</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">@@ -1063,8 +1063,21 @@ because that has different strictness. Hence the use of 'allLazy'.</td>
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Building the saturated syntax</span></span>
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1064
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1064
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<pre style="margin: 0;"> <span id="LC1064" 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="LC1065" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">maybeSaturate deals with saturating primops and constructors</span></span>
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<pre style="margin: 0;">-<span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The type is the type of the entire application</span></span>
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expansion of hasNoBinding things in CorePrep]</span></span>
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<pre style="margin: 0;">+<span id="LC1067" 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="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">maybeSaturate deals with eta expanding to saturate things that can't deal with</span></span>
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unsaturated applications (identified by 'hasNoBinding', currently just</span></span>
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">foreign calls and unboxed tuple/sum constructors).</span></span>
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that eta expansion in CorePrep is very fragile due to the "prediction" of</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CAFfyness made by TidyPgm (see Note [CAFfyness inconsistencies due to eta</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expansion in CorePrep] in TidyPgm for details. We previously saturated primop</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications here as well but due to this fragility (see #16846) we now deal</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with this another way, as described in Note [Primop wrappers] in PrimOp.</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="cm" style="color: #998; font-style: italic;">It's quite likely that eta expansion of constructor applications will</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eventually break in a similar way to how primops did. We really should</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eliminate this case as well.</span></span>
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1068
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1069
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1082
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"></span>
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1070
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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;">maybeSaturate</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;">CpeApp</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;">UniqSM</span> <span class="kt" style="color: #458; font-weight: 600;">CpeRhs</span></span>
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<li id="6c14b513ade9b691d4a805f6a7de89634d3863ae">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#6c14b513ade9b691d4a805f6a7de89634d3863ae"><strong>compiler/main/TidyPgm.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">@@ -1301,7 +1301,48 @@ So we have to *predict* the result here, which is revolting.</td>
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1301
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1301
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<pre style="margin: 0;"> <span id="LC1301" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In particular CorePrep expands Integer and Natural literals. So in the</span></span>
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<pre style="margin: 0;"> <span id="LC1303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">prediction code here we resort to applying the same expansion (cvt_literal).</span></span>
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1304
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<pre style="margin: 0;">-<span id="LC1304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ugh!</span></span>
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1304
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<pre style="margin: 0;">+<span id="LC1304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are also numberous other ways in which we can introduce inconsistencies</span></span>
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<pre style="margin: 0;">+<span id="LC1305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">between CorePrep and TidyPgm. See Note [CAFfyness inconsistencies due to eta</span></span>
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1306
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<pre style="margin: 0;">+<span id="LC1306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expansion in TidyPgm] for one such example.</span></span>
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<pre style="margin: 0;">+<span id="LC1307" class="line" lang="haskell"></span>
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1308
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<pre style="margin: 0;">+<span id="LC1308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ugh! What ugliness we hath wrought.</span></span>
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1309
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<pre style="margin: 0;">+<span id="LC1309" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1310" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CAFfyness inconsistencies due to eta expansion in TidyPgm]</span></span>
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<pre style="margin: 0;">+<span id="LC1312" 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="LC1313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Eta expansion during CorePrep can have non-obvious negative consequences on</span></span>
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the CAFfyness computation done by TidyPgm (see Note [Disgusting computation of</span></span>
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<pre style="margin: 0;">+<span id="LC1315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CafRefs] in TidyPgm). This late expansion happens/happened for a few reasons:</span></span>
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<pre style="margin: 0;">+<span id="LC1316" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * CorePrep previously eta expanded unsaturated primop applications, as</span></span>
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<pre style="margin: 0;">+<span id="LC1318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> described in Note [Primop wrappers]).</span></span>
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<pre style="margin: 0;">+<span id="LC1319" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * CorePrep still does eta expand unsaturated data constructor applications.</span></span>
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<pre style="margin: 0;">+<span id="LC1321" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In particular, consider the program:</span></span>
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Ty = Ty (RealWorld# -> (# RealWorld#, Int #))</span></span>
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<pre style="margin: 0;">+<span id="LC1325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Is this CAFfy?</span></span>
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<pre style="margin: 0;">+<span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x :: STM Int</span></span>
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<pre style="margin: 0;">+<span id="LC1328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = Ty (retry# @Int)</span></span>
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<pre style="margin: 0;">+<span id="LC1329" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider whether x is CAFfy. One might be tempted to answer "no".</span></span>
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<pre style="margin: 0;">+<span id="LC1331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Afterall, f obviously has no CAF references and the application (retry#</span></span>
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@Int) is essentially just a variable reference at runtime.</span></span>
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, when CorePrep expanded the unsaturated application of 'retry#'</span></span>
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<pre style="margin: 0;">+<span id="LC1335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it would rewrite this to</span></span>
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<pre style="margin: 0;">+<span id="LC1336" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = \u []</span></span>
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1338
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<pre style="margin: 0;">+<span id="LC1338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let sat = retry# @Int</span></span>
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1339
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<pre style="margin: 0;">+<span id="LC1339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in Ty sat</span></span>
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1340
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<pre style="margin: 0;">+<span id="LC1340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is now a CAF. Failing to handle this properly was the cause of</span></span>
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<pre style="margin: 0;">+<span id="LC1342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#16846. We fixed this by eliminating the need to eta expand primops, as</span></span>
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1343
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<pre style="margin: 0;">+<span id="LC1343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described in Note [Primop wrappers]), However we have not yet done the same for</span></span>
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<pre style="margin: 0;">+<span id="LC1344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data constructor applications.</span></span>
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<pre style="margin: 0;">+<span id="LC1345" class="line" lang="haskell"></span>
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1346
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1347
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<pre style="margin: 0;"> <span id="LC1347" class="line" lang="haskell"></span>
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1348
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">CafRefEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarEnv</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;">LitNumType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</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;">CoreExpr</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#f171fcd6a9b405926ab6c9973ca110af70daef3b"><strong>compiler/prelude/PrelInfo.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">@@ -131,6 +131,7 @@ knownKeyNames</td>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"></span>
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132
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">wiredInIds</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">primOpId</span><span class="p">)</span> <span class="n" style="color: #333;">allThePrimOps</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">primOpWrapperId</span><span class="p">)</span> <span class="n" style="color: #333;">allThePrimOps</span></span>
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134
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">basicKnownKeyNames</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">templateHaskellNames</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#7b2a3c8a780cfa42412ee2700454599d02c3f69d"><strong>compiler/prelude/PrelNames.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">@@ -498,7 +498,8 @@ pRELUDE :: Module</td>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">pRELUDE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule_</span> <span class="n" style="color: #333;">pRELUDE_NAME</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_PRIM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_TYPES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GENERICS</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_MAGIC</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC501" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_CLASSES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_BASE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_ENUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GHCI</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_CSTRING</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_CLASSES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_PRIMOPWRAPPERS</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_BASE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_ENUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GHCI</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_CSTRING</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_SHOW</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_READ</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_NUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_MAYBE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_INTEGER_TYPE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_NATURAL</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_LIST</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_TUPLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_TUPLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_EITHER</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_STRING</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="n" style="color: #333;">dATA_FOLDABLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_TRAVERSABLE</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">@@ -516,6 +517,7 @@ gHC_TYPES = mkPrimModule (fsLit "GHC.Types")</td>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_MAGIC</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Magic"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_CSTRING</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.CString"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_CLASSES</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Classes"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_PRIMOPWRAPPERS</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.PrimopWrappers"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_BASE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Base"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_ENUM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Enum"</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#9715ddba4708ba02dac192a1f72fa50717761aff"><strong>compiler/prelude/PrimOp.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">@@ -13,6 +13,7 @@ module PrimOp (</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</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;">PrimOpVecCat</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">allThePrimOps</span><span class="p">,</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;">primOpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">primOpSig</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;">primOpTag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">maxPrimOpTag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">primOpOcc</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;">primOpWrapperId</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></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;">tagToEnumKey</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></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">@@ -34,14 +35,18 @@ import TysWiredIn</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">CmmType</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">OccName</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprOccName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkVarOccFS</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Id</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkVanillaGlobalWithInfo</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">IdInfo</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">vanillaIdInfo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCafInfo</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CafInfo</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoCafRefs</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrelNames</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">gHC_PRIMOPWRAPPERS</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TyCon</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isPrimTyCon</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PrimRep</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">RepType</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">typePrimRep1</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConPrimRep1</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">BasicTypes</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Fixity</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;">FixityDirection</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;">Boxity</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="LC46" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SourceText</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">SrcLoc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">wiredInSrcSpan</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ForeignCall</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">CLabelString</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unique</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPrimOpIdUnique</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unique</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPrimOpIdUnique</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">mkPrimOpWrapperUnique</span></span> <span class="p">)</span></span>
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50
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Module</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">UnitId</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">@@ -572,6 +577,47 @@ primOpOcc op = case primOpInfo op of</td>
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572
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Compare</span> <span class="n" style="color: #333;">occ</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">occ</span></span>
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573
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578
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GenPrimOp</span> <span class="n" style="color: #333;">occ</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> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">occ</span></span>
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574
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Primop wrappers]</span></span>
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<pre style="margin: 0;">+<span id="LC581" 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="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Previously hasNoBinding would claim that PrimOpIds didn't have a curried</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function definition. This caused quite some trouble as we would be forced to</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eta expand unsaturated primop applications very late in the Core pipeline. Not</span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only would this produce unnecessary thunks, but it would also result in nasty</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inconsistencies in CAFfy-ness determinations (see #16846 and</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CAFfyness inconsistencies due to late eta expansion] in TidyPgm).</span></span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, it was quite unnecessary for hasNoBinding to claim this; primops in</span></span>
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fact *do* have curried definitions which are found in GHC.PrimopWrappers, which</span></span>
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is auto-generated by utils/genprimops from prelude/primops.txt.pp. These wrappers</span></span>
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are standard Haskell functions mirroring the types of the primops they wrap.</span></span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For instance, in the case of plusInt# we would have:</span></span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> module GHC.PrimopWrappers where</span></span>
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> import GHC.Prim as P</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> plusInt# a b = P.plusInt# a b</span></span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"></span>
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599
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We now take advantage of these curried definitions by letting hasNoBinding</span></span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">claim that PrimOpIds have a curried definition and then rewrite any unsaturated</span></span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PrimOpId applications that we find during CoreToStg as applications of the</span></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">associated wrapper (e.g. `GHC.Prim.plusInt# 3#` will get rewritten to</span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`GHC.PrimopWrappers.plusInt# 3#`).` The Id of the wrapper for a primop can be</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">found using 'PrimOp.primOpWrapperId'.</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Nota Bene: GHC.PrimopWrappers is needed *regardless*, because it's</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">used by GHCi, which does not implement primops direct at all.</span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="cd">-- | Returns the 'Id' of the wrapper associated with the given 'PrimOp'.</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Primop wrappers].</span></span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="n" style="color: #333;">primOpWrapperId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</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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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="n" style="color: #333;">primOpWrapperId</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVanillaGlobalWithInfo</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">info</span></span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCafInfo</span> <span class="n" style="color: #333;">vanillaIdInfo</span> <span class="kt" style="color: #458; font-weight: 600;">NoCafRefs</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkExternalName</span> <span class="n" style="color: #333;">uniq</span> <span class="n" style="color: #333;">gHC_PRIMOPWRAPPERS</span> <span class="p">(</span><span class="n" style="color: #333;">primOpOcc</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">wiredInSrcSpan</span></span>
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimOpWrapperUnique</span> <span class="p">(</span><span class="n" style="color: #333;">primOpTag</span> <span class="n" style="color: #333;">op</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">primOpType</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">isComparisonPrimOp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</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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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">isComparisonPrimOp</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">primOpInfo</span> <span class="n" style="color: #333;">op</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Compare</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<li id="268617cbbb60bb1447a471b156b77fb5b7ff05cc">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/aa6955c03496216d7b94d06f77bdfcb8f4f278bc...b7a1d0d5dc105f89c1e904fadf8b67d223807c2e#268617cbbb60bb1447a471b156b77fb5b7ff05cc"><strong>compiler/stgSyn/CoreToStg.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">@@ -45,7 +45,7 @@ import Util</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ForeignCall</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isUsedOnce</span> <span class="p">)</span></span>
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48
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrimOp</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PrimCall</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrimOp</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PrimCall</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)<span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">primOpWrapperId</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">SrcLoc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkGeneralSrcSpan</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toList</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">@@ -268,7 +268,7 @@ coreTopBindToStg dflags this_mod env ccs (NonRec id rhs)</td>
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StgTopLifted</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">StgNonRec</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">stg_rhs</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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271
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ASSERT2</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">consistentCafInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bind</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff right"> </span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">assertConsistentCaInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bind</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bind</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: previously the assertion printed 'rhs' and 'bind'</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as well as 'id', but that led to a black hole</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where printing the assertion error tripped the</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">@@ -296,9 +296,18 @@ coreTopBindToStg dflags this_mod env ccs (Rec pairs)</td>
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"></span>
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StgTopLifted</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">StgRec</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">binders</span> <span class="n" style="color: #333;">stg_rhss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ASSERT2</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">consistentCafInfo</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">head</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binders</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bind</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">binders</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">assertConsistentCaInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">head</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binders</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bind</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">binders</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">ccs'</span><span class="p">,</span> <span class="n" style="color: #333;">bind</span><span class="p">)</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="cd">-- | CAF consistency issues will generally result in segfaults and are quite</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- difficult to debug (see #16846). We enable checking of the</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'consistentCafInfo' invariant with @-dstg-lint@ to increase the chance that</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we catch these issues.</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="n" style="color: #333;">assertConsistentCaInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</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;">StgTopBinding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</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;">a</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="n" style="color: #333;">assertConsistentCaInfo</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">err_doc</span> <span class="n" style="color: #333;">result</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoStgLinting</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">consistentCafInfo</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"assertConsistentCaInfo"</span> <span class="n" style="color: #333;">err_doc</span></span>
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<pre style="margin: 0;">+<span id="LC310" 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;">result</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="c1" style="color: #998; font-style: italic;">-- Assertion helper: this checks that the CafInfo on the Id matches</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;">-- what CoreToStg has figured out about the binding's SRT. The</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">@@ -528,8 +537,12 @@ coreToStgApp _ f args ticks = do</td>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dropRuntimeRepArgs</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">tyConAppArgs_maybe</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)))</span></span>
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529
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538
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Some primitive operator that might be implemented as a library call.</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">saturated</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgPrimOp</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- As described in Note [Primop wrappers] in PrimOp.hs, here we</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- turn unsaturated primop applications into applications of</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the primop's wrapper.</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">saturated</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgPrimOp</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC545" 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="kt" style="color: #458; font-weight: 600;">StgApp</span> <span class="p">(</span><span class="n" style="color: #333;">primOpWrapperId</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A call to some primitive Cmm function.</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FCallId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CCall</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CCallSpec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StaticTarget</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pkgId</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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