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<h3>
Sebastian Graf pushed to branch wip/dmdanal-split-fvs
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/fc6d33ca3f9e2acea3ac452491d409a4ba3ee77a">fc6d33ca</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-10-24T23:57:42+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Kill `is_thunk` case in `splitFV`
The `splitFV` function implements the highly dubious hack
described in `Note [Lazy und unleashable free variables]` in
GHC.Core.Opt.DmdAnal. It arranges it so that demand signatures only
carry strictness info on free variables. Usage info is released through
other means, see the Note. It's purely for analysis performance reasons.
TODO: Update commit message
But in case of a strict FV demand, we still add the FV to the demand
signature *and* the lazy_fv DmdEnv. It would be far simpler (and more
precise) not having to split the demand over both places, if analysis
performance doesn't degrade too much.
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<h4>2 changed files:</h4>
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<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<h4>Changes:</h4>
<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc6d33ca3f9e2acea3ac452491d409a4ba3ee77a#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/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">@@ -574,8 +574,7 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_fv2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_fv1</span> <span class="p">`</span><span class="n" style="color: #333;">keepAliveDmdEnv</span><span class="p">`</span> <span class="n" style="color: #333;">extra_fvs</span></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Lazy and unleashable free variables]</span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">sig_fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFVs</span> <span class="n" style="color: #333;">is_thunk</span> <span class="n" style="color: #333;">rhs_fv2</span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">exprIsHNF</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">sig_fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionVarEnv</span> <span class="n" style="color: #333;">isWeakDmd</span> <span class="n" style="color: #333;">rhs_fv2</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find the RHS free vars of the unfoldings and RULES</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Absence analysis for stable unfoldings and RULES]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc6d33ca3f9e2acea3ac452491d409a4ba3ee77a#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">@@ -42,7 +42,7 @@ module GHC.Types.Demand (</td>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">seqDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDemandList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqStrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">evalDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cleanEvalDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cleanEvalProdDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrictDmd</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitDmdTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">splitFVs</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">deferAfterPreciseException</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitDmdTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">isWeakDmd</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">deferAfterPreciseException</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">postProcessUnsat</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">postProcessDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"></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;">splitProdDmd_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelManyCalls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmds</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">@@ -796,22 +796,6 @@ cleanUseDmd_maybe :: Demand -> Maybe UseDmd</td>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"><span class="n" style="color: #333;">cleanUseDmd_maybe</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;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Use</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">u</span> <span class="p">})</span> <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;">u</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"><span class="n" style="color: #333;">cleanUseDmd_maybe</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;">Nothing</span></span>
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798
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="n" style="color: #333;">splitFVs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- Thunk</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">)</span></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="n" style="color: #333;">splitFVs</span> <span class="n" style="color: #333;">is_thunk</span> <span class="n" style="color: #333;">rhs_fvs</span></span>
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802
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strictPairToTuple</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">nonDetStrictFoldUFM_Directly</span> <span class="n" style="color: #333;">add</span> <span class="p">(</span><span class="n" style="color: #333;">emptyVarEnv</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">emptyVarEnv</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_fvs</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use a non-deterministic fold because we</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- immediately forget the ordering by putting the elements</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the envs again</span></span>
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<pre style="margin: 0;">-<span id="LC807" 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;">partitionVarEnv</span> <span class="n" style="color: #333;">isWeakDmd</span> <span class="n" style="color: #333;">rhs_fvs</span></span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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809
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">uniq</span> <span class="n" style="color: #333;">dmd</span><span class="o" style="font-weight: 600;">@</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;">s</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;">u</span> <span class="p">})</span> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">sig_fv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Lazy</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addToUFM_Directly</span> <span class="n" style="color: #333;">lazy_fv</span> <span class="n" style="color: #333;">uniq</span> <span class="n" style="color: #333;">dmd</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">sig_fv</span></span>
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<pre style="margin: 0;">-<span id="LC811" 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;">addToUFM_Directly</span> <span class="n" style="color: #333;">lazy_fv</span> <span class="n" style="color: #333;">uniq</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="kt" style="color: #458; font-weight: 600;">Lazy</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;">u</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC812" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:*:</span></span>
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<pre style="margin: 0;">-<span id="LC813" class="line" lang="haskell"> <span class="n" style="color: #333;">addToUFM_Directly</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">uniq</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;">s</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Abs</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC814" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"><span class="n" style="color: #333;">keepAliveDmdEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span></span>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (keepAliveDmdType dt vs) makes sure that the Ids in vs have</span></span>
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- /some/ usage in the returned demand types -- they are not Absent</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">@@ -842,11 +826,6 @@ splitProdDmd_maybe (JD { sd = s, ud = u })</td>
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842
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826
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lazy</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Use</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UProd</span> <span class="n" style="color: #333;">ux</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">mkJointDmds</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ux</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Lazy</span><span class="p">)</span> <span class="n" style="color: #333;">ux</span><span class="p">)</span></span>
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843
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827
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <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;">Nothing</span></span>
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844
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"></span>
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845
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</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="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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848
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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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849
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"></span>
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850
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829
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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851
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830
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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852
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TypeShape and demand trimming</span></span>
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