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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>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1d5ea5a389f07ac37f65c6c12378f234944f28c">f1d5ea5a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-25T10:42:34+01:00</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.
It turns out that `splitFV` has a quite involved case for thunks that
produces slightly different usage signatures and it's not clear why we
need it: `splitFV` is only relevant in the LetDown case and the only
time we call it on thunks is for top-level or local recursive thunks.
Since usage signatures of top-level thunks can only reference other
top-level bindings and we completely discard demand info we have on
top-level things (see the lack of `setIdDemandInfo` in
`dmdAnalTopBind`), the `is_thunk` case is completely irrelevant here.
For local, recursive thunks, the added benefit of the `is_thunk` test
is marginal: We get used-multiple-times in some cases where previously
we had used-once if a recursive thunk has multiple call sites. It's
very unlikely and not a case to optimise for.
So we kill the `is_thunk` case and inline `splitFV` at its call site,
exposing `isWeakDmd` from `GHC.Types.Demand` instead.
The NoFib summary supports this decision:
```
Min 0.0% -0.0%
Max 0.0% +0.0%
Geometric Mean -0.0% -0.0%
```
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
</a>
</li>
<li class="file-stats">
<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/f1d5ea5a389f07ac37f65c6c12378f234944f28c#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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575
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"></span>
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576
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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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577
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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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578
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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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581
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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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -595,8 +594,9 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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595
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">_env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="cd">-- | If given the let-bound 'Id', 'useLetUp' determines whether we should</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- process the binding up (body before rhs) or down (rhs before body).</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cd">-- | If given the (local, non-recursive) let-bound 'Id', 'useLetUp' determines</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether we should process the binding up (body before rhs) or down (rhs</span></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- before body).</span></span>
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<pre style="margin: 0;"> <span id="LC600" 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="LC601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use LetDown if there is a chance to get a useful strictness signature to</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleash at call sites. LetDown is generally more precise than LetUp if we can</span></span>
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<li id="d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1d5ea5a389f07ac37f65c6c12378f234944f28c#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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<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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803
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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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<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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<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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<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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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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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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