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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/77398b678aba45ba25932a39b7e8a7a31d0dd6f3">77398b67</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-08-09T21:18:34-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid allocations in `splitAtList` (#18535)
As suspected by @simonpj in #18535, avoiding allocations in
`GHC.Utils.Misc.splitAtList` when there are no leftover arguments is
beneficial for performance:
On CI validate-x86_64-linux-deb9-hadrian:
T12227 -7%
T12545 -12.3%
T5030 -10%
T9872a -2%
T9872b -2.1%
T9872c -2.5%
Metric Decrease:
T12227
T12545
T5030
T9872a
T9872b
T9872c
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<h4>1 changed file:</h4>
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compiler/GHC/Utils/Misc.hs
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<h4>Changes:</h4>
<li id="4d45cd1896284e4b4034580e431af68b09013b33">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77398b678aba45ba25932a39b7e8a7a31d0dd6f3#4d45cd1896284e4b4034580e431af68b09013b33"><strong>compiler/GHC/Utils/Misc.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">@@ -774,12 +774,15 @@ dropList _ xs@[] = xs</td>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"><span class="n" style="color: #333;">dropList</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;">xs</span><span class="p">)</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;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropList</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cd">-- | Given two lists xs=x0..xn and ys=y0..ym, return `splitAt n ys`.</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">splitAtList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="n" style="color: #333;">a</span><span class="p">],</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">splitAtList</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">splitAtList</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">xs</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span><span class="p">,</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"><span class="n" style="color: #333;">splitAtList</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;">xs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ys'</span><span class="p">,</span> <span class="n" style="color: #333;">ys''</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC781" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ys'</span><span class="p">,</span> <span class="n" style="color: #333;">ys''</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAtList</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">splitAtList</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we are careful to avoid allocating when there are no leftover</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- arguments: in this case we can return "ys" directly (cf #18535)</span></span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ys</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- len(ys) <= len(xs)</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ys</span><span class="p">,</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- = splitAt n ys</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</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;">as</span><span class="p">)</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;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">bs</span></span>
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786
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"></span>
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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- drop from the end of a list</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="n" style="color: #333;">dropTail</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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