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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/64c774b043a2d9be3b98e445990c795f070dab3f">64c774b0</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-07-14T21:31:27-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explain why keeping DynFlags in AnalEnv saves allocation.
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<h4>1 changed file:</h4>
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compiler/GHC/Core/Opt/DmdAnal.hs
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<h4>Changes:</h4>
<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64c774b043a2d9be3b98e445990c795f070dab3f#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/DmdAnal.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">@@ -1179,8 +1179,26 @@ type DFunFlag = Bool -- indicates if the lambda being considered is in the</td>
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"><span class="n" style="color: #333;">notArgOfDfun</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DFunFlag</span></span>
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"><span class="n" style="color: #333;">notArgOfDfun</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [dmdAnalEnv performance]</span></span>
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<pre style="margin: 0;">+<span id="LC1183" 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="LC1184" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's tempting to think that removing the dynflags from AnalEnv would improve</span></span>
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">performance. After all when analysing recursive groups we end up allocating</span></span>
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a lot of environments. However this is not the case.</span></span>
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do get some performance by making AnalEnv smaller. However very often we</span></span>
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defer computation which means we have to capture the dynflags in the thunks</span></span>
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we allocate. Doing this naively in practice causes more allocation than the</span></span>
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">removal of DynFlags saves us.</span></span>
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In theory it should be possible to make this better if we are stricter in</span></span>
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the analysis and therefore allocate fewer thunks. But I couldn't get there</span></span>
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a few hours and overall the impact on GHC here is small, and there are</span></span>
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bigger fish to fry. So for new the env will keep a reference to the flags.</span></span>
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<pre style="margin: 0;">+<span id="LC1198" 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="LC1200" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AE</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_dflags</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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<td class="diff-line-num new old_line" data-linenumber="1184" 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="LC1201" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AE</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_dflags</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [dmdAnalEnv performance]</span></span></span>
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<td class="diff-line-num old_line" data-linenumber="1184" 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">
1184
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<pre style="margin: 0;"> <span id="LC1202" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_sigs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SigEnv</span></span>
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<td class="diff-line-num old_line" data-linenumber="1185" 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">
1185
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_virgin</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True on first iteration only</span></span>
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<td class="diff-line-num old_line" data-linenumber="1186" 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">
1186
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Initialising strictness]</span></span>
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