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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>
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<h4>
Commits:
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<ul>
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<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
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<h4>1 changed file:</h4>
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<a href="#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9">
compiler/GHC/Core/Opt/Simplify/Monad.hs
</a>
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<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="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>
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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>
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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>
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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>
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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>
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63
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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>
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64
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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>
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65
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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>
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65
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66
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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>
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66
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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68
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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>
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69
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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>
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70
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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>
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71
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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>
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72
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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>
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73
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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>
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74
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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>
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75
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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>
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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>
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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>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"></span>
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67
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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>
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68
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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>
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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>
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