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<h3>
Sebastian Graf pushed to branch wip/dmdanal-datacon-sig
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/594163c5968e086cc18ef7e1aa36693fb7947a6f">594163c5</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-04-08T22:33:07+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: No need to attach a StrictSig to DataCon workers
In GHC.Types.Id.Make we were giving a strictness signature to every data
constructor wrapper Id that we weren't looking at in demand analysis
anyway. We used to use its CPR info, but that has its own CPR signature
now.
`Note [Data-con worker strictness]` then felt very out of place, so I
moved it to GHC.Core.DataCon.
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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<li class="file-stats">
<a href="#1419e35d2402c23209a644b054c5a67aa4463451">
compiler/GHC/Core/Op/DmdAnal.hs
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<li class="file-stats">
<a href="#e3fe84599ec044fc7aacb062dada32b067732fc8">
compiler/GHC/Core/Op/Simplify.hs
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<li class="file-stats">
<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<li class="file-stats">
<a href="#261c0c5029eb34eb7436b087d77314f377ff8223">
compiler/GHC/Types/Id/Make.hs
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<h4>Changes:</h4>
<li id="6fcf64907fb5bdd93082d2d1eb94e4566e735865">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/594163c5968e086cc18ef7e1aa36693fb7947a6f#6fcf64907fb5bdd93082d2d1eb94e4566e735865"><strong>compiler/GHC/Core/DataCon.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">@@ -614,7 +614,7 @@ data DataConRep</td>
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and *including* all evidence args</span></span>
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dcr_stricts</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">StrictnessMark</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- 1-1 with dcr_arg_tys</span></span>
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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Data-con worker strictness]<span class="idiff left right"> in GHC.Types.Id.Make</span></span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Data-con worker strictness]</span></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dcr_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsImplBang</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- The actual decisions made (including failures)</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- about the original arguments; 1-1 with orig_arg_tys</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">@@ -715,8 +715,26 @@ filterEqSpec eq_spec</td>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">EqSpec</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqSpec</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Bangs on data constructor arguments]</span></span>
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<pre style="margin: 0;">-<span id="LC719" 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="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Data-con worker strictness]</span></span>
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<pre style="margin: 0;">+<span id="LC719" 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="LC720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that we do *not* say the worker Id is strict even if the data</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor is declared strict</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e.g. data T = MkT !(Int,Int)</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why? Because the *wrapper* $WMkT is strict (and its unfolding has case</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expressions that do the evals) but the *worker* MkT itself is not. If we</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pretend it is strict then when we see</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case x of y -> MkT y</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the simplifier thinks that y is "sure to be evaluated" (because the worker MkT</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is strict) and drops the case. No, the workerId MkT is not strict.</span></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, the worker does have StrictnessMarks. When the simplifier sees a</span></span>
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pattern</span></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case e of MkT x -> ...</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it uses the dataConRepStrictness of MkT to mark x as evaluated; but that's</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fine... dataConRepStrictness comes from the data con not from the worker Id.</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Bangs on data constructor arguments]</span></span>
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<pre style="margin: 0;">+<span id="LC737" 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="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int {-# UNPACK #-} !Int Bool</span></span>
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/594163c5968e086cc18ef7e1aa36693fb7947a6f#1419e35d2402c23209a644b054c5a67aa4463451"><strong>compiler/GHC/Core/Op/DmdAnal.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">@@ -454,7 +454,7 @@ dmdTransform :: AnalEnv -- The strictness environment</td>
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<pre style="margin: 0;"> <span id="LC454" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTransform</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataConWorkId</span> <span class="n" style="color: #333;">var</span> <span class="c1" style="color: #998; font-style: italic;">-- Data constructor</span></span>
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<pre style="margin: 0;">-<span id="LC457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformDataConSig</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">idStrictness</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformDataConSig</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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458
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"></span>
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459
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<pre style="margin: 0;"> <span id="LC459" 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_DmdTxDictSel</span> <span class="p">(</span><span class="n" style="color: #333;">ae_dflags</span> <span class="n" style="color: #333;">env</span><span class="p">),</span></span>
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460
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isClassOpId_maybe</span> <span class="n" style="color: #333;">var</span> <span class="c1" style="color: #998; font-style: italic;">-- Dictionary component selector</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/594163c5968e086cc18ef7e1aa36693fb7947a6f#e3fe84599ec044fc7aacb062dada32b067732fc8"><strong>compiler/GHC/Core/Op/Simplify.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">@@ -2758,7 +2758,7 @@ a case pattern. This is *important*. Consider</td>
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2758
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<pre style="margin: 0;"> <span id="LC2758" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We really must record that b is already evaluated so that we don't</span></span>
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<pre style="margin: 0;"> <span id="LC2760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">go and re-evaluate it when constructing the result.</span></span>
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2761
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<pre style="margin: 0;">-<span id="LC2761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Data-con worker strictness] in GHC.<span class="idiff left right">Types.Id.Make</span></span></span>
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<pre style="margin: 0;">+<span id="LC2761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Data-con worker strictness] in GHC.<span class="idiff left right">Core.DataCon</span></span></span>
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2762
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<pre style="margin: 0;"> <span id="LC2762" class="line" lang="haskell"></span>
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2763
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<pre style="margin: 0;"> <span id="LC2763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: simplLamBndrs preserves this eval info</span></span>
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<pre style="margin: 0;"> <span id="LC2764" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/594163c5968e086cc18ef7e1aa36693fb7947a6f#d09e98aae6ad2eb59d08eac7894b68c0ab820cda"><strong>compiler/GHC/Types/Demand.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">@@ -1666,17 +1666,15 @@ dmdTransformSig (StrictSig dmd_ty@(DmdType _ arg_ds _)) cd</td>
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">postProcessUnsat</span> <span class="p">(</span><span class="n" style="color: #333;">peelManyCalls</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">arg_ds</span><span class="p">)</span> <span class="n" style="color: #333;">cd</span><span class="p">)</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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1667
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Demands from unsaturated function calls]</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"></span>
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1669
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTransformDataConSig</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;"><span class="idiff left">StrictSig</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTransformDataConSig</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;">CleanDemand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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1670
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Same as dmdTransformSig but for a data constructor (worker),</span></span>
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1671
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which has a special kind of demand transformer.</span></span>
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<pre style="margin: 0;"> <span id="LC1672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the constructor is saturated, we feed the demand on</span></span>
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the result into the constructor arguments.</span></span>
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTransformDataConSig</span> <span class="n" style="color: #333;">arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">con_res</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">str</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">abs</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTransformDataConSig</span> <span class="n" style="color: #333;">arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">str</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">abs</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">str_dmds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_str</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">abs_dmds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_abs</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">abs</span></span>
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">emptyDmdEnv</span> <span class="p">(</span><span class="n" style="color: #333;">mkJointDmds</span> <span class="n" style="color: #333;">str_dmds</span> <span class="n" style="color: #333;">abs_dmds</span><span class="p">)</span> <span class="n" style="color: #333;">con_res</span></span>
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Must remember whether it's a product, hence con_res, not TopRes</span></span>
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">emptyDmdEnv</span> <span class="p">(</span><span class="n" style="color: #333;">mkJointDmds</span> <span class="n" style="color: #333;">str_dmds</span> <span class="n" style="color: #333;">abs_dmds</span><span class="p">)</span> <span class="n" style="color: #333;">topDiv</span></span>
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Not saturated</span></span>
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nopDmdType</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">@@ -506,10 +506,9 @@ mkDataConWorkId wkr_name data_con</td>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">data_con</span> <span class="c1" style="color: #998; font-style: italic;">-- The representation TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"> <span class="n" style="color: #333;">wkr_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConRepType</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">----------- Workers for data types --------------</span></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------- Workers for data types --------------</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"> <span class="n" style="color: #333;">alg_wkr_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noCafIdInfo</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setArityInfo</span><span class="p">`</span> <span class="n" style="color: #333;">wkr_arity</span></span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span> <span class="n" style="color: #333;">wkr_sig</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="n" style="color: #333;">wkr_arity</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCPR</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setUnfoldingInfo</span><span class="p">`</span> <span class="n" style="color: #333;">evaldUnfolding</span> <span class="c1" style="color: #998; font-style: italic;">-- Record that it's evaluated,</span></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- even if arity = 0</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">@@ -518,27 +517,7 @@ mkDataConWorkId wkr_name data_con</td>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- setNeverLevPoly</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"> <span class="n" style="color: #333;">wkr_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConRepArity</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"> <span class="n" style="color: #333;">wkr_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">wkr_arity</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="n" style="color: #333;">topDiv</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Data-con worker strictness]</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Notice that we do *not* say the worker Id is strict</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- even if the data constructor is declared strict</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;">-- e.g. data T = MkT !(Int,Int)</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;">-- Why? Because the *wrapper* $WMkT is strict (and its unfolding has</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;">-- case expressions that do the evals) but the *worker* MkT itself is</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;">-- not. If we pretend it is strict then when we see</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;">-- case x of y -> MkT y</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;">-- the simplifier thinks that y is "sure to be evaluated" (because</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;">-- the worker MkT is strict) and drops the case. No, the workerId</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;">-- MkT is not strict.</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;">--</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;">-- However, the worker does have StrictnessMarks. When the simplifier</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;">-- sees a pattern</span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- case e of MkT x -> ...</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it uses the dataConRepStrictness of MkT to mark x as evaluated;</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but that's fine... dataConRepStrictness comes from the data con</span></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;">-- not from the worker Id.</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"></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;">----------- Workers for newtypes --------------</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------- Workers for newtypes --------------</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"> <span class="n" style="color: #333;">univ_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConUnivTyVars</span> <span class="n" style="color: #333;">data_con</span></span>
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543
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522
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConRepArgTys</span> <span class="n" style="color: #333;">data_con</span> <span class="c1" style="color: #998; font-style: italic;">-- Should be same as dataConOrigArgTys</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="n" style="color: #333;">nt_work_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noCafIdInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- The NoCaf-ness is set by noCafIdInfo</span></span>
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