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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/22ea9c296906ad3a8fed384bcf6fb35d4b6ca814">22ea9c29</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-11-28T15:42:13-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small optimization to CmmSink.
Inside `regsUsedIn` we can avoid some thunks by specializing the
recursion. In particular we avoid the thunk for `(f e z)` in the
MachOp/Load branches, where we know this will evaluate to z.
Reduces allocations for T3294 by ~1%.
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<h4>1 changed file:</h4>
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<a href="#b1390f6749e1a2dddcae35f88d55623ea6269f56">
compiler/GHC/Cmm/Sink.hs
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<h4>Changes:</h4>
<li id="b1390f6749e1a2dddcae35f88d55623ea6269f56">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22ea9c296906ad3a8fed384bcf6fb35d4b6ca814#b1390f6749e1a2dddcae35f88d55623ea6269f56"><strong>compiler/GHC/Cmm/Sink.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">@@ -449,6 +449,7 @@ tryToInline platform live node assigs = go usages node emptyLRegSet assigs</td>
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449
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemLRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">skipped</span></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">okToInline</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">node</span><span class="p">)</span></span>
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451
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- How often is l used in the current node.</span></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"> <span class="n" style="color: #333;">l_usages</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupUFM</span> <span class="n" style="color: #333;">usages</span> <span class="n" style="color: #333;">l</span></span>
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<pre style="margin: 0;"> <span id="LC454" class="line" lang="haskell"> <span class="n" style="color: #333;">l_live</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">live</span></span>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"></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">@@ -554,10 +555,16 @@ addUsage m r = addToUFM_C (+) m r 1</td>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"><span class="n" style="color: #333;">regsUsedIn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LRegSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"><span class="n" style="color: #333;">regsUsedIn</span> <span class="n" style="color: #333;">ls</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">nullLRegSet</span> <span class="n" style="color: #333;">ls</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="LC557" class="line" lang="haskell"><span class="n" style="color: #333;">regsUsedIn</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapRecExpf</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">e</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">l</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemLRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">ls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmRegOff</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemLRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">ls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"><span class="n" style="color: #333;">regsUsedIn</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">e</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">use</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LRegSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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560
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">ls</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">l</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemLRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">ls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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561
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">ls</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmRegOff</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">elemLRegSet</span><span class="p">`</span> <span class="n" style="color: #333;">ls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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562
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">_ls</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span></span>
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563
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"></span>
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564
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<pre style="margin: 0;">+<span id="LC564" 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;">LRegSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">es</span></span>
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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLoad</span> <span class="n" style="color: #333;">addr</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">z</span></span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">ls</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">z</span></span>
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561
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568
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"></span>
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562
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569
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we don't inline into CmmUnsafeForeignCall if the expression refers</span></span>
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563
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570
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to global registers. This is a HACK to avoid global registers</span></span>
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