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<h3>
Simon Peyton Jones pushed to branch wip/T13253
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/eaa8446170ae6685978c21a44f0ceb2c275aea3c">eaa84461</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-07-24T10:08:56+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert the multi-case inline fix
It makes GHC run a bit slower in some cases.
Let's try again without.
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<h4>1 changed file:</h4>
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compiler/GHC/Core/Opt/Simplify/Utils.hs
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<h4>Changes:</h4>
<li id="48fbb5cdea308650de5756521feb28ec68819b9b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaa8446170ae6685978c21a44f0ceb2c275aea3c#48fbb5cdea308650de5756521feb28ec68819b9b"><strong>compiler/GHC/Core/Opt/Simplify/Utils.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">@@ -1350,13 +1350,14 @@ postInlineUnconditionally env top_lvl bndr occ_info rhs</td>
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<pre style="margin: 0;"> <span id="LC1350" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is very important in practice; e.g. wheel-seive1 doubles</span></span>
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<pre style="margin: 0;"> <span id="LC1351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in allocation if you miss this out</span></span>
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<pre style="margin: 0;"> <span id="LC1352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OneOcc</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_in_lam</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in_lam</span><span class="p">,</span> <span class="n" style="color: #333;">occ_int_cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">int_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">occ_n_br</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n_br</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OneOcc</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_in_lam</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in_lam</span><span class="p">,</span> <span class="n" style="color: #333;">occ_int_cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">int_cxt</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- occ_n_br = n_br</span></span>
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<pre style="margin: 0;"> <span id="LC1355" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppress exponential blowup]</span></span>
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"> <span class="n" style="color: #333;">n_br</span> <span class="o" style="font-weight: 600;"><</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">int_cxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"> <span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- </span>n_br < (case int_cxt of</span></span>
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<pre style="margin: 0;"> <span id="LC1357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> IsInteresting -> 16</span></span>
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<pre style="margin: 0;"> <span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NotInteresting -> 4)</span></span>
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<pre style="margin: 0;"> <span id="LC1359" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">smallEnoughToInline</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">unfolding</span> <span class="c1" style="color: #998; font-style: italic;">-- Small enough to dup</span></span>
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> && <span class="idiff left">-}</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">smallEnoughToInline</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">unfolding</span> <span class="c1" style="color: #998; font-style: italic;">-- Small enough to dup</span></span>
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<pre style="margin: 0;"> <span id="LC1361" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: consider discount on smallEnoughToInline if int_cxt is true</span></span>
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<pre style="margin: 0;"> <span id="LC1362" 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="LC1363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Do NOT inline arbitrarily big things, even if occ_n_br=1</span></span>
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