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<h3>
Simon Peyton Jones pushed to branch wip/T18354
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/2a165899a6b447e74e2b02ea7b26eff1496f8eb4">2a165899</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-06-18T22:43:06+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Two small tweaks to Coercion.simplifyArgsWorker
These tweaks affect the inner loop of simplifyArgsWorker, which
in turn is called from the flattener in Flatten.hs. This is
a key perf bottleneck to T9872{a,b,c,d}.
These two small changes have a modest but useful benefit.
No change in functionality whatsoever.
Relates to #18354
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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/2a165899a6b447e74e2b02ea7b26eff1496f8eb4#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">@@ -1794,6 +1794,8 @@ liftCoSubstWith r tvs cos ty</td>
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @lc_left@ is a substitution mapping type variables to the left-hand</span></span>
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<pre style="margin: 0;"> <span id="LC1795" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- types of the mapped coercions in @lc@, and similar for @lc_right@.</span></span>
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1796
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<pre style="margin: 0;"> <span id="LC1796" class="line" lang="haskell"><span class="n" style="color: #333;">liftCoSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</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;">LiftingContext</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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<pre style="margin: 0;">+<span id="LC1797" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE liftCoSubst #-}</span></span>
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Inlining this function is worth 2% of allocation in T9872d,</span></span>
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<pre style="margin: 0;"> <span id="LC1799" class="line" lang="haskell"><span class="n" style="color: #333;">liftCoSubst</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">lc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LC</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkReflCo</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1801" 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;">ty_co_subst</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2846" 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>
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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">@@ -2846,7 +2848,9 @@ simplifyArgsWorker orig_ki_binders orig_inner_ki orig_fvs</td>
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<pre style="margin: 0;"> <span id="LC2848" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Role</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Roles at which to flatten these ...</span></span>
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<pre style="margin: 0;"> <span id="LC2849" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- flattened arguments, with their flattening coercions</span></span>
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<pre style="margin: 0;"> <span id="LC2850" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2849" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_xis</span> <span class="n" style="color: #333;">acc_cos</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">binders</span> <span class="n" style="color: #333;">inner_ki</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC2851" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_xis</span> <span class="n" style="color: #333;">acc_cos</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">binders</span> <span class="n" style="color: #333;">inner_ki</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC2852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The !lc makes the function strict in the lifting context</span></span>
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<pre style="margin: 0;">+<span id="LC2853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which means GHC can unbox that pair. A modest win.</span></span>
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<pre style="margin: 0;"> <span id="LC2854" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">acc_xis</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">acc_cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2855" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2856" class="line" lang="haskell"> <span class="n" style="color: #333;">final_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPiTys</span> <span class="n" style="color: #333;">binders</span> <span class="n" style="color: #333;">inner_ki</span></span>
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