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<h3>
Simon Peyton Jones pushed to branch wip/T18078
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/69c0e16e9ce9fe045851c09425956fa3407824ae">69c0e16e</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-05-23T00:14:17+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimisation in Unique.Supply
Will need a proper Note; putting it up for CI for now
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<h4>1 changed file:</h4>
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<a href="#598aebb67cf4996e7c7414ec0bef247e3b5e0d73">
compiler/GHC/Types/Unique/Supply.hs
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<h4>Changes:</h4>
<li id="598aebb67cf4996e7c7414ec0bef247e3b5e0d73">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69c0e16e9ce9fe045851c09425956fa3407824ae#598aebb67cf4996e7c7414ec0bef247e3b5e0d73"><strong>compiler/GHC/Types/Unique/Supply.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">@@ -3,6 +3,7 @@</td>
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(c) The GRASP/AQUA Project, Glasgow University, 1992-1998</span></span>
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4
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4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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5
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5
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -fno-state-hack #-}</span></span>
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6
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7
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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 CPP #-}</span></span>
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8
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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 DeriveFunctor #-}</span></span>
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9
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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 PatternSynonyms #-}</span></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">@@ -89,21 +90,18 @@ uniqFromMask mask</td>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">mkUnique</span> <span class="n" style="color: #333;">mask</span> <span class="n" style="color: #333;">uqNum</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC92" 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="LC92" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ord</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">c</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">shiftL</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">uNIQUE_BITS</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">of</span></span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="n" style="color: #333;"><span class="idiff">mask</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">let</span></span></span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- here comes THE MAGIC:</span></span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_supply</span></span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">where</span></span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">mask</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ord</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">c</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">shiftL</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">uNIQUE_BITS</span></span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here comes THE MAGIC:</span></span>
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<pre style="margin: 0;"> <span id="LC98" 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>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Use unsafeInterleaveIO for thread-safety.</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeInterleaveIO</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">genSym</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">s1</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">s2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkSplitUniqSupply</span> <span class="p">(</span><span class="n" style="color: #333;">mask</span> <span class="o" style="font-weight: 600;">.|.</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Use unsafeInterleaveIO for thread-safety.</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeInterleaveIO</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">genSym</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">s1</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_supply</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">s2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkSplitUniqSupply</span> <span class="p">(</span><span class="n" style="color: #333;">mask</span> <span class="o" style="font-weight: 600;">.|.</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"genSym"</span> <span class="n" style="color: #333;">genSym</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"initGenSym"</span> <span class="n" style="color: #333;">initUniqSupply</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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