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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f71f69714255165d0fdc2790a588487ff9439dc">9f71f697</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:13:27-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two bangs to improve perf of flattening
This tiny patch improves the compile time of flatten-heavy
programs by 1-2%, by adding two bangs.
Addresses (somewhat) #18502
This reduces allocation by
T9872b -1.1%
T9872d -3.3%
T5321Fun -0.2%
T5631 -0.2%
T5837 +0.1%
T6048 +0.1%
Metric Decrease:
T9872b
T9872d
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<h4>1 changed file:</h4>
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f71f69714255165d0fdc2790a588487ff9439dc#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.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">@@ -1891,7 +1891,9 @@ substForAllCoBndrUsingLC sym sco (LC subst lc_env) tv co</td>
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1891
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1891
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1892
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1892
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<pre style="margin: 0;"> <span id="LC1892" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For the inverse operation, see 'liftCoMatch'</span></span>
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1893
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1893
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<pre style="margin: 0;"> <span id="LC1893" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LiftingContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1894
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<pre style="margin: 0;">-<span id="LC1894" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- !lc: making this function strict in lc allows callers to</span></span>
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pass its two components separately, rather than boxing them</span></span>
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</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">@@ -2864,9 +2866,9 @@ simplifyArgsWorker orig_ki_binders orig_inner_ki orig_fvs</td>
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<pre style="margin: 0;"> <span id="LC2866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need a coercion (kind_co :: old_kind ~ new_kind).</span></span>
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<pre style="margin: 0;"> <span id="LC2867" 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="LC2868" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The bangs here have been observed to improve performance</span></span>
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<pre style="margin: 0;">-<span id="LC2867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- significantly in optimized builds<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;">-<span id="LC2868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2869" class="line" lang="haskell"> <span class="n" style="color: #333;">liftCoSubst</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">lc</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoBinderType</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- significantly in optimized builds<span class="idiff left right">; see #18502</span></span></span>
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<pre style="margin: 0;">+<span id="LC2870" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2871" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">liftCoSubst</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">lc</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoBinderType</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2872" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">casted_xi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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<pre style="margin: 0;"> <span id="LC2873" class="line" lang="haskell"> <span class="n" style="color: #333;">casted_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoherenceLeftCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC2874" class="line" lang="haskell"></span>
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