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<h3>
Sebastian Graf pushed to branch wip/cpr-expandable-unfoldings
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68b5786d17d8c9f801f15d5e4fc25167b6eff8fe">68b5786d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-06T17:13:44+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CprAnal: Don't attach CPR sigs to expandable bindings (#18154)

Instead, look through expandable unfoldings in `cprTransform`.
See the new Note [CPR for expandable unfoldings]:

```
GHC generates a lot of TyCon and KindRep bindings, one for each new data
declaration. Attaching CPR signatures to each of them is quite wasteful.
In general, DataCon application bindings
  * Never get WW'd, so their CPR signature should be irrelevant after analysis
  * Would need to be inlined to see their CPR
  * Recording (Nested!) CPR on them blows up interface file sizes
But we can't just stop giving DataCon application bindings the CPR property,
for example
  fac 0 = 1
  fac n = n * fac (n-1)
fac certainly has the CPR property and should be WW'd! But FloatOut will
transform the first clause to
  lvl = 1
  fac 0 = lvl
If lvl doesn't have the CPR property, fac won't either. So instead we keep on
looking through *expandable* unfoldings for these arity 0 bindings.
```

Fixes #18154.
</pre>
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<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
compiler/GHC/Core/Opt/CprAnal.hs
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<h4>Changes:</h4>
<li id="c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68b5786d17d8c9f801f15d5e4fc25167b6eff8fe#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b"><strong>compiler/GHC/Core/Opt/CprAnal.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell">    <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell">    <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">id</span>                   <span class="c1" style="color: #998; font-style: italic;">-- imported function or data con worker</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">+<span id="LC235" 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;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupExpandableUnfolding</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cprAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- Imported function or data con worker</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getCprSig</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC236" 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;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="c1" style="color: #998; font-style: italic;">-- local let-bound</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- Local let-bound</span></span>
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<pre style="margin: 0;">+<span id="LC241" 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;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getCprSig</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topCprType</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="303" 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="diff-line-num unfold js-unfold new_line" data-linenumber="308" 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">@@ -303,6 +308,8 @@ cprAnalBind top_lvl env id rhs</td>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">stays_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trimCprTy</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for sum types]</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">returns_sum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trimCprTy</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<td class="diff-line-num new old_line" data-linenumber="306" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">will_expand</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topCprType</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming for CPR signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell">    <span class="n" style="color: #333;">sig</span>             <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCprSigForArity</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty'</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="316" 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="diff-line-num unfold js-unfold new_line" data-linenumber="323" 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">@@ -316,6 +323,19 @@ cprAnalBind top_lvl env id rhs</td>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell">    <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ret_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell">    <span class="n" style="color: #333;">not_a_prod</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNothing</span> <span class="p">(</span><span class="n" style="color: #333;">deepSplitProductType_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ret_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell">    <span class="n" style="color: #333;">returns_sum</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;">isTopLevel</span> <span class="n" style="color: #333;">top_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not_a_prod</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell">    <span class="n" style="color: #333;">will_expand</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">lookupExpandableUnfolding</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="n" style="color: #333;">lookupExpandableUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="n" style="color: #333;">lookupExpandableUnfolding</span> <span class="n" style="color: #333;">id</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
331
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expandUnfolding_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">cprIdUnfolding</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="332" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span>       <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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333
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="334" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
334
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="n" style="color: #333;">cprIdUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdUnfoldingFun</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="n" style="color: #333;">cprIdUnfolding</span> <span class="n" style="color: #333;">id</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- There will only be phase 0 Simplifier runs after CprAnal</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="337" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isActiveIn</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">idInlineActivation</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">id</span></span>
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<td class="diff-line-num new new_line" data-linenumber="338" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
338
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<pre style="margin: 0;">+<span id="LC338" 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;">noUnfolding</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Arity trimming for CPR signatures]</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="626" 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="diff-line-num unfold js-unfold new_line" data-linenumber="646" 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">@@ -626,6 +646,28 @@ fac won't have the CPR property here when we trim every thunk! But the</td>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">assumption is that error cases are rarely entered and we are diverging anyway,</span></span>
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<td class="diff-line-num new_line" data-linenumber="647" 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">
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so WW doesn't hurt.</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="628" 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">
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<td class="diff-line-num new_line" data-linenumber="648" 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">
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="649" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Should we also trim CPR on DataCon bindings?</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="650" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [CPR for expandable unfoldings]!</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="651" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC generates a lot of TyCon and KindRep bindings, one for each new data</span></span>
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655
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">declaration. Attaching CPR signatures to each of them is quite wasteful.</span></span>
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656
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, DataCon application bindings</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  * Never get WW'd, so their CPR signature should be irrelevant after analysis</span></span>
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658
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  * Would need to be inlined to see their CPR</span></span>
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659
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  * Recording (Nested!) CPR on them blows up interface file sizes</span></span>
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660
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we can't just stop giving DataCon application bindings the CPR property,</span></span>
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661
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for example</span></span>
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662
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  fac 0 = 1</span></span>
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663
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  fac n = n * fac (n-1)</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fac certainly has the CPR property and should be WW'd! But FloatOut will</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transform the first clause to</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  lvl = 1</span></span>
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667
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  fac 0 = lvl</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If lvl doesn't have the CPR property, fac won't either. So instead we keep on</span></span>
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669
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">looking through *expandable* unfoldings for these arity 0 bindings.</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"></span>
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629
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CPR examples]</span></span>
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<td class="diff-line-num old_line" data-linenumber="630" 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">
630
</td>
<td class="diff-line-num new_line" data-linenumber="672" 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">
672
</td>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="631" 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">
631
</td>
<td class="diff-line-num new_line" data-linenumber="673" 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">
673
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here are some examples (stranal/should_compile/T10482a) of the</span></span>
</pre>
</td>
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