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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/acf537f9fefa31883b7cb28ff61b837ab7f8a44a">acf537f9</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-08-10T20:24:09-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make splitAtList strict in its arguments
Also fix its slightly wrong comment
Metric Decrease:
T5030
T12227
T12545
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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/acf537f9fefa31883b7cb28ff61b837ab7f8a44a#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">@@ -6,6 +6,7 @@</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TupleSections #-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC12" 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">@@ -774,15 +775,18 @@ dropList _ xs@[] = xs</td>
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<pre style="margin: 0;"> <span id="LC775" 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="LC776" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC777" 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<span class="idiff left right">=x0..xn and ys=y0..ym, return `splitAt n</span> ys`.</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cd">-- | Given two lists xs<span class="idiff left right"> and ys, return `splitAt (length xs)</span> 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="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="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="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="o" style="font-weight: 600;"><span class="idiff left right">#</span></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="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="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="LC783" 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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<pre style="margin: 0;">+<span id="LC784" 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="LC785" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We make `xs` strict because in the general case `ys` isn't `[]` so we</span></span>
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will have to evaluate `xs` anyway.</span></span>
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" 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;">-- length ys <= length xs</span></span>
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<pre style="margin: 0;">+<span id="LC788" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">n</span><span class="p">)</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="LC789" 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="o" style="font-weight: 600;">#</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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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC791" 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="LC792" 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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