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<h3>
Simon Peyton Jones pushed to branch wip/T18202-simplifier
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/07250e72b1f3c9db1cb84f1904a477f97cd13da0">07250e72</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-24T22:10:31+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta-expand the Simplifier monad

This patch eta-expands the Simplifier's monad, using the method
explained in GHC.Core.Unify Note [The one-shot state monad trick].
It's part of the exta-expansion programme in #18202.

It's a tiny patch, but is worth a 1-2% reduction in bytes-allocated
by the compiler.  Here's the list, based on the compiler-performance
tests in perf/compiler:

                    Reduction in bytes allocated
   T10858(normal)      -0.7%
   T12425(optasm)      -1.3%
   T13056(optasm)      -1.8%
   T14683(normal)      -1.1%
   T15164(normal)      -1.3%
   T15630(normal)      -1.4%
   T17516(normal)      -2.3%
   T18282(normal)      -1.6%
   T18304(normal)      -0.8%
   T1969(normal)       -0.6%
   T4801(normal)       -0.8%
   T5321FD(normal)     -0.7%
   T5321Fun(normal)    -0.5%
   T5642(normal)       -0.9%
   T6048(optasm)       -1.1%
   T9020(optasm)       -2.7%
   T9233(normal)       -0.7%
   T9675(optasm)       -0.5%
   T9961(normal)       -2.9%
   WWRec(normal)       -1.2%

Metric Decrease:
    T12425
    T9020
    T9961
</pre>
</li>
</ul>
<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9">
compiler/GHC/Core/Opt/Simplify/Monad.hs
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="37879a759bc2ca5cc8f1f35235fe96e3e55b57c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07250e72b1f3c9db1cb84f1904a477f97cd13da0#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9"><strong>compiler/GHC/Core/Opt/Simplify/Monad.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">@@ -43,6 +43,7 @@ import GHC.Utils.Panic     (throwGhcExceptionIO, GhcException (..))</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span>     <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">treatZeroAsInf</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkIntWithInf</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span>       <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">ap</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span>        <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span><span class="p">(</span> <span class="n" style="color: #333;">oneShot</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="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="56" 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="57" 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">@@ -56,14 +57,25 @@ For the simplifier monad, we want to {\em thread} a unique supply and a counter.</td>
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<pre style="margin: 0;"> <span id="LC57" 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="LC58" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">SimplM</span> <span class="n" style="color: #333;">result</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span>  <span class="kt" style="color: #458; font-weight: 600;">SM</span>  <span class="p">{</span> <span class="n" style="color: #333;">unSM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplTopEnv</span>  <span class="c1" style="color: #998; font-style: italic;">-- Envt that does not change much</span></span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span>   <span class="c1" style="color: #998; font-style: italic;">-- We thread the unique supply because</span></span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- constantly splitting it is rather expensive</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span><span class="p">)}</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- w</span>e only need IO here for dump output</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span>  <span class="kt" style="color: #458; font-weight: 600;">SM<span class="idiff left right">'</span></span>  <span class="p">{</span> <span class="n" style="color: #333;">unSM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplTopEnv</span>  <span class="c1" style="color: #998; font-style: italic;">-- Envt that does not change much</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="65" 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="LC61" class="line" lang="haskell">                <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span>   <span class="c1" style="color: #998; font-style: italic;">-- We thread the unique supply because</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="65" 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="62" 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="LC62" class="line" lang="haskell">                                <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- constantly splitting it is rather expensive</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="65" 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="LC63" class="line" lang="haskell">                <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="65" 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="LC64" class="line" lang="haskell">                <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span><span class="p">)}</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell">  <span class="idiff left">  </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- W</span>e only need IO here for dump output</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Functor</span><span class="p">)</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SimplTopEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="69" 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="LC69" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SimplCount</span><span class="p">))</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="70" 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="LC70" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplM</span> <span class="n" style="color: #333;">result</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="71" 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="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This pattern synonym makes the simplifier monad eta-expand,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="72" 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="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which as a very beneficial effect on compiler performance</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="73" 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="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (worth a 1-2% reduction in bytes-allocated).  See #18202.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="74" 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="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick] in GHC.Core.Unify</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="75" 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="LC75" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">SM'</span> <span class="n" style="color: #333;">m</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="76" 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">
76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="77" 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">
77
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SM'</span> <span class="p">(</span><span class="n" style="color: #333;">oneShot</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="67" 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="78" 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">
78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="67" 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">
67
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<td class="diff-line-num new_line" data-linenumber="79" 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">
79
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SimplTopEnv</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="68" 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">
68
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80
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">STE</span> <span class="p">{</span> <span class="n" style="color: #333;">st_flags</span>     <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="69" 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">
69
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81
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell">        <span class="p">,</span> <span class="n" style="color: #333;">st_max_ticks</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span>  <span class="c1" style="color: #998; font-style: italic;">-- Max #ticks in this simplifier run</span></span>
</pre>
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