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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/4549cadf855d14a6b737ceddf4e474faf8e343ff">4549cadf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-06-18T20:03:19Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sure mkSplitUniqSupply stores the precomputed mask only.

mkSplitUniqSupply was lazy on the boxed char.

This caused a bunch of issues:
* The closure captured the boxed Char
* The mask was recomputed on every split of the supply.
* It also caused the allocation of MkSplitSupply to happen in it's own
(allocated) closure. The reason of which I did not further investigate.

We know force the computation of the mask inside mkSplitUniqSupply.
* This way the mask is computed at most once per UniqSupply creation.
* It allows ww to kick in, causing the closure to retain the unboxed
value.

Requesting Uniques in a loop is now faster by about 20%.

I did not check the impact on the overall compiler, but I added a test
to avoid regressions.
</pre>
</li>
</ul>
<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#2da47fed955dc80b79c67ba640b94aeecf9d5524">
compiler/basicTypes/UniqSupply.hs
</a>
</li>
<li class="file-stats">
<a href="#15a9f9be4aeaf88dc41618baa2ab24b3b57941dc">
<span class="new-file">
+
testsuite/tests/perf/should_run/UniqLoop.hs
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</a>
</li>
<li class="file-stats">
<a href="#f41ec90131956922871428d1f65574b7c372b5af">
testsuite/tests/perf/should_run/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="2da47fed955dc80b79c67ba640b94aeecf9d5524">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/4549cadf855d14a6b737ceddf4e474faf8e343ff#2da47fed955dc80b79c67ba640b94aeecf9d5524"><strong>compiler/basicTypes/UniqSupply.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 CPP #-}</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 DeriveFunctor #-}</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 PatternSynonyms #-}</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 BangPatterns #-}</span></span>
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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="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GHC_LOADED_INTO_GHCI</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="89" 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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -88,7 +89,7 @@ takeUniqFromSupply :: UniqSupply -> (Unique, UniqSupply)</td>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"><span class="n" style="color: #333;">mkSplitUniqSupply</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ord</span> <span class="n" style="color: #333;">c</span> <span class="p">`</span><span class="n" style="color: #333;">shiftL</span><span class="p">`</span> <span class="n" style="color: #333;">uNIQUE_BITS</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new_line old" data-linenumber="92" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="haskell">     <span class="n" style="color: #333;">mask</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span></span>
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<td class="diff-line-num new new_line" data-linenumber="92" 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="LC92" class="line" lang="haskell">     <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="n" style="color: #333;">mask</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span></span>
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<td class="diff-line-num new_line" data-linenumber="93" 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">
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- here comes THE MAGIC:</span></span>
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<td class="diff-line-num new_line" data-linenumber="94" 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">
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line" data-linenumber="95" 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">
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- This is one of the most hammered bits in the whole compiler</span></span>
</pre>
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</table>
<br>
</li>
<li id="15a9f9be4aeaf88dc41618baa2ab24b3b57941dc">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/4549cadf855d14a6b737ceddf4e474faf8e343ff#15a9f9be4aeaf88dc41618baa2ab24b3b57941dc"><strong>testsuite/tests/perf/should_run/UniqLoop.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" 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="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqSupply</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Generate a lot of uniques</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell">    <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkSplitUniqSupply</span> <span class="sc" style="color: #d14;">'v'</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell">    <span class="n" style="color: #333;">seq</span> <span class="p">(</span><span class="n" style="color: #333;">churn</span> <span class="n" style="color: #333;">us</span> <span class="mi" style="color: #099;">10000000</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">churn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</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="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">churn</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">us</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getKey</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">uniqFromSupply</span> <span class="n" style="color: #333;">us</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">churn</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">us'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeUniqFromSupply</span> <span class="n" style="color: #333;">us</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">churn</span> <span class="n" style="color: #333;">us'</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></pre>
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<li id="f41ec90131956922871428d1f65574b7c372b5af">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/4549cadf855d14a6b737ceddf4e474faf8e343ff#f41ec90131956922871428d1f65574b7c372b5af"><strong>testsuite/tests/perf/should_run/all.T</strong></a>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="perl">     <span class="nv" style="color: #008080;">only_ways</span><span class="p">([</span><span class="s" style="color: #d14;">'normal'</span><span class="p">])],</span></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="perl">    <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="perl">    <span class="p">[</span><span class="s" style="color: #d14;">'-O2'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Test performance of creating Uniques.</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'UniqLoop'</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="perl">     <span class="p">[</span><span class="nv" style="color: #008080;">collect_stats</span><span class="p">(</span><span class="s" style="color: #d14;">'bytes allocated'</span><span class="p">,</span><span class="mi" style="color: #099;">5</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="perl">      <span class="nv" style="color: #008080;">only_ways</span><span class="p">([</span><span class="s" style="color: #d14;">'normal'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="perl">      <span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="perl">     <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="perl">     <span class="p">[</span><span class="s" style="color: #d14;">'-O -package ghc'</span><span class="p">])</span></span></pre>
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