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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/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990">13f6c9d0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:13:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor linear reg alloc to remember past assignments.
When assigning registers we now first try registers we
assigned to in the past, instead of picking the "first"
one.
This is in extremely helpful when dealing with loops for
which variables are dead for part of the loop.
This is important for patterns like this:
foo = arg1
loop:
use(foo)
...
foo = getVal()
goto loop;
There we:
* assign foo to the register of arg1.
* use foo, it's dead after this use as it's overwritten after.
* do other things.
* look for a register to put foo in.
If we pick an arbitrary one it might differ from the register the
start of the loop expect's foo to be in.
To fix this we simply look for past register assignments for
the given variable. If we find one and the register is free we
use that register.
This reduces the need for fixup blocks which match the register
assignment between blocks. In the example above between the end
and the head of the loop.
This patch also moves branch weight estimation ahead of register
allocation and adds a flag to control it (cmm-static-pred).
* It means the linear allocator is more likely to assign the hotter
code paths first.
* If it assign these first we are:
+ Less likely to spill on the hot path.
+ Less likely to introduce fixup blocks on the hot path.
These two measure combined are surprisingly effective. Based on nofib
we get in the mean:
* -0.9% instructions executed
* -0.1% reads/writes
* -0.2% code size.
* -0.1% compiler allocations.
* -0.9% compile time.
* -0.8% runtime.
Most of the benefits are simply a result of removing redundant moves
and spills.
Reduced compiler allocations likely are the result of less code being
generated. (The added lookup is mostly non-allocating).
</pre>
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<h4>16 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#10b61652f9817945bb54ccf8fc40f8a664ca3c30">
compiler/GHC/CmmToAsm.hs
</a>
</li>
<li class="file-stats">
<a href="#5986ebaacfa99d264abfd2f7ef19d99a64db720f">
compiler/GHC/CmmToAsm/BlockLayout.hs
</a>
</li>
<li class="file-stats">
<a href="#d6e95c6ffd8955a51f59d69de7525bebd693db69">
compiler/GHC/CmmToAsm/CFG.hs
</a>
</li>
<li class="file-stats">
<a href="#ee14f325b8d394d681c0d3c18a3477016d1092ef">
compiler/GHC/CmmToAsm/Instr.hs
</a>
</li>
<li class="file-stats">
<a href="#83a3b2df5c77503c3a8c6df05a7654333d30cac3">
compiler/GHC/CmmToAsm/Reg/Linear.hs
</a>
</li>
<li class="file-stats">
<a href="#e7e32ef13a93a68891f700047f89c45df0e3772d">
compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
</a>
</li>
<li class="file-stats">
<a href="#b3464ce8651c663fa952441e77c36955a283cd00">
compiler/GHC/CmmToAsm/Reg/Linear/PPC.hs
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<li class="file-stats">
<a href="#9c35bb499c0b984f0940353f6f8514d39fe10870">
compiler/GHC/CmmToAsm/Reg/Linear/SPARC.hs
</a>
</li>
<li class="file-stats">
<a href="#8fc0cb54eee9a1662a2e0ced10fc6eef66561a72">
compiler/GHC/CmmToAsm/Reg/Linear/State.hs
</a>
</li>
<li class="file-stats">
<a href="#8a5d5b6d1415946cdbebc680a0c9d26ebca2a497">
compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
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<li class="file-stats">
<a href="#c2a3ab492c92cc765c97d9d8a6537aacdd65f1f9">
compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
</a>
</li>
<li class="file-stats">
<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
</a>
</li>
<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
</li>
<li class="file-stats">
<a href="#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f">
compiler/GHC/Utils/Outputable.hs
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<li class="file-stats">
<a href="#2e45f2cd303dd998950a7c8042e796a5b2abd64f">
docs/users_guide/using-optimisation.rst
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</ul>
<h4>Changes:</h4>
<li id="10b61652f9817945bb54ccf8fc40f8a664ca3c30">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#10b61652f9817945bb54ccf8fc40f8a664ca3c30"><strong>compiler/GHC/CmmToAsm.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">@@ -728,7 +728,7 @@ cmmNativeGen dflags this_mod modLoc ncgImpl us fileIds dbgMap cmm count</td>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"></span>
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729
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">optimizedCFG</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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730
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="n" style="color: #333;">optimizedCFG</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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731
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<td class="diff-line-num new_line old" data-linenumber="731" 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="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">optimizeCFG</span> <span class="p">(</span><span class="n" style="color: #333;">cfgWeightInfo</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">cmm</span> <span class="o" style="font-weight: 600;"><$!></span> <span class="n" style="color: #333;">postShortCFG</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">optimizeCFG</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">gopt</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Opt_CmmStaticPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">cfgWeightInfo</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">cmm</span> <span class="o" style="font-weight: 600;"><$!></span> <span class="n" style="color: #333;">postShortCFG</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"></span>
</pre>
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733
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733
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"> <span class="n" style="color: #333;">maybeDumpCfg</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">optimizedCFG</span> <span class="s" style="color: #d14;">"CFG Weights - Final"</span> <span class="n" style="color: #333;">proc_name</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"></span>
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<li id="5986ebaacfa99d264abfd2f7ef19d99a64db720f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#5986ebaacfa99d264abfd2f7ef19d99a64db720f"><strong>compiler/GHC/CmmToAsm/BlockLayout.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="636" 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="diff-line-num unfold js-unfold new_line" data-linenumber="636" 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">@@ -636,22 +636,8 @@ sequenceChain :: forall a i. (Instruction i, Outputable i)</td>
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636
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636
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GenBasicBlock</span> <span class="n" style="color: #333;">i</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Blocks placed in sequence.</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"><span class="n" style="color: #333;">sequenceChain</span> <span class="n" style="color: #333;">_info</span> <span class="n" style="color: #333;">_weights</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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638
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="n" style="color: #333;">sequenceChain</span> <span class="n" style="color: #333;">_info</span> <span class="n" style="color: #333;">_weights</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>
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639
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"><span class="n" style="color: #333;">sequenceChain</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">weights'</span> <span class="n" style="color: #333;">blocks</span><span class="o" style="font-weight: 600;">@</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">BasicBlock</span> <span class="n" style="color: #333;">entry</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">weights</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">weights</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">--pprTrace "cfg'" (pprEdgeWeights cfg')</span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg'</span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">globalEdgeWeights</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC mkGlobalWeights #-}</span> <span class="n" style="color: #333;">mkGlobalWeights</span> <span class="n" style="color: #333;">entry</span> <span class="n" style="color: #333;">weights'</span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg'</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC rewriteEdges #-}</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"> <span class="n" style="color: #333;">mapFoldlWithKey</span></span>
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<pre style="margin: 0;">-<span id="LC647" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">mapFoldlWithKey</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">setEdgeWeight</span> <span class="n" style="color: #333;">cfg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EdgeWeight</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">m</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">weights'</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="n" style="color: #333;">globalEdgeWeights</span></span>
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"> <span class="n" style="color: #333;">directEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"><span class="n" style="color: #333;">sequenceChain</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">weights</span> <span class="n" style="color: #333;">blocks</span><span class="o" style="font-weight: 600;">@</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">BasicBlock</span> <span class="n" style="color: #333;">entry</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">directEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">directEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortBy</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">compare</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">relevantWeight</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">(</span><span class="n" style="color: #333;">infoEdgeList</span> <span class="n" style="color: #333;">weights</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="n" style="color: #333;">relevantWeight</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#d6e95c6ffd8955a51f59d69de7525bebd693db69"><strong>compiler/GHC/CmmToAsm/CFG.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">@@ -670,11 +670,21 @@ findBackEdges root cfg =</td>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"> <span class="n" style="color: #333;">typedEdges</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"> <span class="n" style="color: #333;">classifyEdges</span> <span class="n" style="color: #333;">root</span> <span class="n" style="color: #333;">getSuccs</span> <span class="n" style="color: #333;">edges</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[((</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">),</span><span class="kt" style="color: #458; font-weight: 600;">EdgeType</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CfgWeights</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RawCmmDecl</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmData</span> <span class="p">{})</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</span> <span class="n" style="color: #333;">weights</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmProc</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">_lab</span> <span class="n" style="color: #333;">_live</span> <span class="n" style="color: #333;">graph</span><span class="p">)</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC optimizeCFG #-}</span></span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</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;">D</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CfgWeights</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RawCmmDecl</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmData</span> <span class="p">{})</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">optimizeCFG</span> <span class="n" style="color: #333;">doStaticPred</span> <span class="n" style="color: #333;">weights</span> <span class="n" style="color: #333;">proc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmProc</span> <span class="n" style="color: #333;">_info</span> <span class="n" style="color: #333;">_lab</span> <span class="n" style="color: #333;">_live</span> <span class="n" style="color: #333;">graph</span><span class="p">)</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">doStaticPred</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">staticPredCfg</span> <span class="p">(</span><span class="n" style="color: #333;">g_entry</span> <span class="n" style="color: #333;">graph</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"> <span class="n" style="color: #333;">optHsPatterns</span> <span class="n" style="color: #333;">weights</span> <span class="n" style="color: #333;">proc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="cd">-- | Modify branch weights based on educated guess on</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- patterns GHC tends to produce and how they affect</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- performance.</span></span>
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<pre style="margin: 0;">+<span id="LC682" 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="LC683" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Most importantly we penalize jumps across info tables.</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="n" style="color: #333;">optHsPatterns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CfgWeights</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RawCmmDecl</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"><span class="n" style="color: #333;">optHsPatterns</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmData</span> <span class="p">{})</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="n" style="color: #333;">optHsPatterns</span> <span class="n" style="color: #333;">weights</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmProc</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">_lab</span> <span class="n" style="color: #333;">_live</span> <span class="n" style="color: #333;">graph</span><span class="p">)</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC optHsPatterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "Initial:" (pprEdgeWeights cfg) $</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "Initial:" (ppr $ mkGlobalWeights (g_entry graph) cfg) $</span></span>
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690
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<pre style="margin: 0;"> <span id="LC690" 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">@@ -749,6 +759,21 @@ optimizeCFG weights (CmmProc info _lab _live graph) cfg =</td>
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749
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CmmSource</span> <span class="p">{</span> <span class="n" style="color: #333;">trans_cmmNode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmmCondBranch</span> <span class="p">{}</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">source</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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750
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760
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</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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761
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cd">-- | Convert block-local branch weights to global weights.</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="n" style="color: #333;">staticPredCfg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BlockId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="n" style="color: #333;">staticPredCfg</span> <span class="n" style="color: #333;">entry</span> <span class="n" style="color: #333;">cfg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cfg'</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">globalEdgeWeights</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC mkGlobalWeights #-}</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="n" style="color: #333;">mkGlobalWeights</span> <span class="n" style="color: #333;">entry</span> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg'</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC rewriteEdges #-}</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"> <span class="n" style="color: #333;">mapFoldlWithKey</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span></span>
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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"> <span class="n" style="color: #333;">mapFoldlWithKey</span></span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">setEdgeWeight</span> <span class="n" style="color: #333;">cfg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EdgeWeight</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="p">)</span></span>
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773
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg</span> <span class="n" style="color: #333;">m</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"> <span class="n" style="color: #333;">cfg</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"> <span class="n" style="color: #333;">globalEdgeWeights</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 class="cd">-- | Determine loop membership of blocks based on SCC analysis</span></span>
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778
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is faster but only gives yes/no answers.</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">loopMembers</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">CFG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LabelMap</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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">@@ -922,6 +947,10 @@ revPostorderFrom cfg root =</td>
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922
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- reverse post order. Which is required for diamond control flow to work probably.</span></span>
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948
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<pre style="margin: 0;"> <span id="LC948" 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="LC949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We also apply a few prediction heuristics (based on the same paper)</span></span>
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<pre style="margin: 0;">+<span id="LC950" 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="LC951" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The returned result represents frequences.</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For blocks it's the expected number of executions and</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for edges is the number of traversals.</span></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE mkGlobalWeights #-}</span></span>
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# SCC mkGlobalWeights #-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#ee14f325b8d394d681c0d3c18a3477016d1092ef"><strong>compiler/GHC/CmmToAsm/Instr.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">@@ -37,7 +37,10 @@ import GHC.CmmToAsm.Config</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (for allocation purposes, anyway).</span></span>
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<pre style="margin: 0;"> <span id="LC38" 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="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RegUsage</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RU</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Reg</span><span class="p">]</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Reg</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RU</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="n" style="color: #333;">reads</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Reg</span><span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;">writes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Reg</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cd">-- | No regs read or written to.</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">noUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RegUsage</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#83a3b2df5c77503c3a8c6df05a7654333d30cac3"><strong>compiler/GHC/CmmToAsm/Reg/Linear.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, CPP, ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ConstraintKinds #-}</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" 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="LC5" 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">@@ -137,6 +138,7 @@ import GHC.Platform</td>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Applicative</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC143" 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="LC144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Top level of the register allocator</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">@@ -229,8 +231,13 @@ linearRegAlloc config entry_ids block_live sccs</td>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">linearRegAlloc'</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">entry_ids</span> <span class="n" style="color: #333;">block_live</span> <span class="n" style="color: #333;">sccs</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ncgPlatform</span> <span class="n" style="color: #333;">config</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"><span class="cd">-- | Constraints on the instruction instances used by the</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- linear allocator.</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">OutputableRegConstraint</span> <span class="n" style="color: #333;">freeRegs</span> <span class="n" style="color: #333;">instr</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FR</span> <span class="n" style="color: #333;">freeRegs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">freeRegs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">instr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Instruction</span> <span class="n" style="color: #333;">instr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"><span class="n" style="color: #333;">linearRegAlloc'</span></span>
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">NCGConfig</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">freeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ entry points</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">@@ -246,7 +253,7 @@ linearRegAlloc' config initFreeRegs entry_ids block_live sccs</td>
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">blocks</span><span class="p">,</span> <span class="n" style="color: #333;">stats</span><span class="p">,</span> <span class="n" style="color: #333;">getStackUse</span> <span class="n" style="color: #333;">stack</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="n" style="color: #333;">linearRA_SCCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"><span class="n" style="color: #333;">linearRA_SCCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NatBasicBlock</span> <span class="n" style="color: #333;">instr</span><span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="281" 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="diff-line-num unfold js-unfold new_line" data-linenumber="288" 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">@@ -281,7 +288,7 @@ linearRA_SCCs entry_ids block_live blocksAcc (CyclicSCC blocks : sccs)</td>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> more sanity checking to guard against this eventuality.</span></span>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">process</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="n" style="color: #333;">process</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GenBasicBlock</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LiveInstr</span> <span class="n" style="color: #333;">instr</span><span class="p">)]</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">@@ -325,15 +332,18 @@ process entry_ids block_live (b@(BasicBlock id _) : blocks)</td>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"><span class="cd">-- | Do register allocation on this basic block</span></span>
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<pre style="margin: 0;"> <span id="LC333" 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="LC334" class="line" lang="haskell"><span class="n" style="color: #333;">processBlock</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ live regs on entry to each basic block</span></span>
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LiveBasicBlock</span> <span class="n" style="color: #333;">instr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ block to do register allocation on</span></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RegM</span> <span class="n" style="color: #333;">freeRegs</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NatBasicBlock</span> <span class="n" style="color: #333;">instr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ block with registers allocated</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"><span class="n" style="color: #333;">processBlock</span> <span class="n" style="color: #333;">block_live</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BasicBlock</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">instrs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">initBlock</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">block_live</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTraceM "processBlock" $ text "" $$ ppr (BasicBlock id instrs)</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"> <span class="n" style="color: #333;">initBlock</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">block_live</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">instrs'</span><span class="p">,</span> <span class="n" style="color: #333;">fixups</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">linearRA</span> <span class="n" style="color: #333;">block_live</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">instrs</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTraceM "blockResult" $ ppr (instrs', fixups)</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">BasicBlock</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">instrs'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">fixups</span></span>
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338
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348
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"></span>
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349
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<pre style="margin: 0;"> <span id="LC349" 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">@@ -369,7 +379,7 @@ initBlock id block_live</td>
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379
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="cd">-- | Do allocation for a sequence of instructions.</span></span>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"><span class="n" style="color: #333;">linearRA</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ map of what vregs are live on entry to each block.</span></span>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">instr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ accumulator for instructions already processed.</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NatBasicBlock</span> <span class="n" style="color: #333;">instr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ accumulator for blocks of fixup code.</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">@@ -396,7 +406,7 @@ linearRA block_live accInstr accFixups id (instr:instrs)</td>
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406
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"></span>
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397
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407
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"><span class="cd">-- | Do allocation for a single instruction.</span></span>
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398
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408
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">raInsn</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ map of what vregs are love on entry to each block.</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">instr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ accumulator for instructions already processed.</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BlockId</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ the id of the current block, for debugging</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">@@ -476,7 +486,7 @@ isInReg src assig | Just (InReg _) <- lookupUFM assig src = True</td>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</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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487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC479" class="line" lang="haskell"><span class="n" style="color: #333;">genRaInsn</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Instruction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">genRaInsn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">OutputableRegConstraint</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instr</span></span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="kt" style="color: #458; font-weight: 600;">RegSet</span></span>
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">instr</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BlockId</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">@@ -486,6 +496,7 @@ genRaInsn :: (FR freeRegs, Instruction instr, Outputable instr)</td>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RegM</span> <span class="n" style="color: #333;">freeRegs</span> <span class="p">([</span><span class="n" style="color: #333;">instr</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NatBasicBlock</span> <span class="n" style="color: #333;">instr</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">genRaInsn</span> <span class="n" style="color: #333;">block_live</span> <span class="n" style="color: #333;">new_instrs</span> <span class="n" style="color: #333;">block_id</span> <span class="n" style="color: #333;">instr</span> <span class="n" style="color: #333;">r_dying</span> <span class="n" style="color: #333;">w_dying</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="LC499" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pprTraceM "genRaInsn" $ ppr (block_id, instr)</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPlatform</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">regUsageOfInstr</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">instr</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">RU</span> <span class="n" style="color: #333;">read</span> <span class="n" style="color: #333;">written</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</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">@@ -525,6 +536,8 @@ genRaInsn block_live new_instrs block_id instr r_dying w_dying = do</td>
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536
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fixup_blocks</span><span class="p">,</span> <span class="n" style="color: #333;">adjusted_instr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">joinToTargets</span> <span class="n" style="color: #333;">block_live</span> <span class="n" style="color: #333;">block_id</span> <span class="n" style="color: #333;">instr</span></span>
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538
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when (not $ null fixup_blocks) $ pprTraceM "genRA:FixBlocks" $ ppr fixup_blocks</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Debugging - show places where the reg alloc inserted</span></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- assignment fixup blocks.</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when (not $ null fixup_blocks) $</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">@@ -737,7 +750,7 @@ data SpillLoc = ReadMem StackSlot -- reading from register only in memory</td>
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the list of free registers and free stack slots.</span></span>
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"><span class="n" style="color: #333;">allocateRegsAndSpill</span></span>
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FR</span> <span class="n" style="color: #333;">freeRegs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">instr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Instruction</span> <span class="n" style="color: #333;">instr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">freeRegs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">instr</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FR</span> <span class="n" style="color: #333;">freeRegs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">instr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Instruction</span> <span class="n" style="color: #333;">instr</span><span class="p">)</span></span>
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741
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> reading (load up spilled regs)</span></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VirtualReg</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- don't push these out</span></span>
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756
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">instr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- spill insns</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">@@ -749,7 +762,8 @@ allocateRegsAndSpill _ _ spills alloc []</td>
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">spills</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">alloc</span><span class="p">)</span></span>
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763
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"><span class="n" style="color: #333;">allocateRegsAndSpill</span> <span class="n" style="color: #333;">reading</span> <span class="n" style="color: #333;">keep</span> <span class="n" style="color: #333;">spills</span> <span class="n" style="color: #333;">alloc</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">assig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getAssigR</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">assig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getAssigR</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RegM</span> <span class="n" style="color: #333;">freeRegs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RegMap</span> <span class="kt" style="color: #458; font-weight: 600;">Loc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTraceM "allocateRegsAndSpill:assig" (ppr (r:rs) $$ ppr assig)</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">doSpill</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">allocRegsAndSpill_spill</span> <span class="n" style="color: #333;">reading</span> <span class="n" style="color: #333;">keep</span> <span class="n" style="color: #333;">spills</span> <span class="n" style="color: #333;">alloc</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">rs</span> <span class="n" style="color: #333;">assig</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupUFM</span> <span class="n" style="color: #333;">assig</span> <span class="n" style="color: #333;">r</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- case (1a): already in a register</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">@@ -779,6 +793,26 @@ allocateRegsAndSpill reading keep spills alloc (r:rs)</td>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">doSpill</span> <span class="kt" style="color: #458; font-weight: 600;">WriteNew</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"><span class="cd">-- | Given a virtual reg find a preferred real register.</span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The preferred register is simply the first one the variable</span></span>
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- was assigned to (if any). This way when we allocate for a loop</span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables are likely to end up in the same registers at the</span></span>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- end and start of the loop, avoiding redundant reg-reg moves.</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note: I tried returning a list of past assignments, but that</span></span>
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- turned out to barely matter but added a few tenths of</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a percent to compile time.</span></span>
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="n" style="color: #333;">findPrefRealReg</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">freeRegs</span> <span class="n" style="color: #333;">u</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">u</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RegM</span> <span class="n" style="color: #333;">freeRegs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">RealReg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"><span class="n" style="color: #333;">findPrefRealReg</span> <span class="n" style="color: #333;">vreg</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="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">bassig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getBlockAssigR</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RegM</span> <span class="n" style="color: #333;">freeRegs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BlockMap</span> <span class="p">(</span><span class="n" style="color: #333;">freeRegs</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">RegMap</span> <span class="kt" style="color: #458; font-weight: 600;">Loc</span><span class="p">))</span></span>
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808
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"> <span class="n" style="color: #333;">return</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;">findVirtRegAssig</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">bassig</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"> <span class="n" style="color: #333;">findVirtRegAssig</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">freeRegs</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">RegMap</span> <span class="kt" style="color: #458; font-weight: 600;">Loc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">RealReg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">RealReg</span></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"> <span class="n" style="color: #333;">findVirtRegAssig</span> <span class="n" style="color: #333;">assig</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span></span>
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812
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;"><|></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupUFM</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">assig</span><span class="p">)</span> <span class="n" style="color: #333;">vreg</span> <span class="kr" style="font-weight: 600;">of</span></span>
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813
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InReg</span> <span class="n" style="color: #333;">real_reg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">real_reg</span></span>
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814
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InBoth</span> <span class="n" style="color: #333;">real_reg</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">real_reg</span></span>
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815
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">z</span></span>
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816
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- reading is redundant with reason, but we keep it around because it's</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- convenient and it maintains the recursive structure of the allocator. -- EZY</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">@@ -795,18 +829,26 @@ allocRegsAndSpill_spill :: (FR freeRegs, Instruction instr, Outputable instr)</td>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">allocRegsAndSpill_spill</span> <span class="n" style="color: #333;">reading</span> <span class="n" style="color: #333;">keep</span> <span class="n" style="color: #333;">spills</span> <span class="n" style="color: #333;">alloc</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">rs</span> <span class="n" style="color: #333;">assig</span> <span class="n" style="color: #333;">spill_loc</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPlatform</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"> <span class="n" style="color: #333;">freeRegs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFreeRegsR</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">freeRegs_thisClass</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">frGetFreeRegs</span> <span class="n" style="color: #333;">platform</span> <span class="p">(</span><span class="n" style="color: #333;">classOfVirtualReg</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">freeRegs</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">freeRegs_thisClass</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">frGetFreeRegs</span> <span class="n" style="color: #333;">platform</span> <span class="p">(</span><span class="n" style="color: #333;">classOfVirtualReg</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">freeRegs</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RealReg</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">freeRegs_thisClass</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can we put the variable into a register it already was?</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"> <span class="n" style="color: #333;">pref_reg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findPrefRealReg</span> <span class="n" style="color: #333;">r</span></span>
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801
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">freeRegs_thisClass</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- case (2): we have a free register</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">my_reg</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">spills'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">loadTemp</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">spill_loc</span> <span class="n" style="color: #333;">my_reg</span> <span class="n" style="color: #333;">spills</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">first_free</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_reg</span></span>
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">reg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pref_reg</span></span>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">reg</span> <span class="p">`</span><span class="n" style="color: #333;">elem</span><span class="p">`</span> <span class="n" style="color: #333;">freeRegs_thisClass</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reg</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">first_free</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="n" style="color: #333;">spills'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">loadTemp</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">spill_loc</span> <span class="n" style="color: #333;">final_reg</span> <span class="n" style="color: #333;">spills</span></span>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="n" style="color: #333;">setAssigR</span> <span class="p">(</span><span class="n" style="color: #333;">addToUFM</span> <span class="n" style="color: #333;">assig</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">newLocation</span> <span class="n" style="color: #333;">spill_loc</span> <span class="n" style="color: #333;"><span class="idiff left right">my</span>_reg</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">setFreeRegsR</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">frAllocateReg</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;"><span class="idiff left right">my</span>_reg</span> <span class="n" style="color: #333;">freeRegs</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"> <span class="n" style="color: #333;">setAssigR</span> <span class="p">(</span><span class="n" style="color: #333;">addToUFM</span> <span class="n" style="color: #333;">assig</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">newLocation</span> <span class="n" style="color: #333;">spill_loc</span> <span class="n" style="color: #333;"><span class="idiff left right">final</span>_reg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="n" style="color: #333;">setFreeRegsR</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">frAllocateReg</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;"><span class="idiff left right">final</span>_reg</span> <span class="n" style="color: #333;">freeRegs</span></span>
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850
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="n" style="color: #333;">allocateRegsAndSpill</span> <span class="n" style="color: #333;">reading</span> <span class="n" style="color: #333;">keep</span> <span class="n" style="color: #333;">spills'</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">my</span>_reg</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">alloc</span><span class="p">)</span> <span class="n" style="color: #333;">rs</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="n" style="color: #333;">allocateRegsAndSpill</span> <span class="n" style="color: #333;">reading</span> <span class="n" style="color: #333;">keep</span> <span class="n" style="color: #333;">spills'</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">final</span>_reg</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">alloc</span><span class="p">)</span> <span class="n" style="color: #333;">rs</span></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- case (3): we need to push something out to free up a register</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">@@ -814,7 +856,8 @@ allocRegsAndSpill_spill reading keep spills alloc r rs assig spill_loc</td>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inRegOrBoth</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InReg</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</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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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="n" style="color: #333;">inRegOrBoth</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InBoth</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</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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816
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">inRegOrBoth</span> <span class="kr" style="font-weight: 600;">_</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="LC817" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">candidates'</span> <span class="o" style="font-weight: 600;">=</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">candidates'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqFM</span> <span class="kt" style="color: #458; font-weight: 600;">Loc</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="n" style="color: #333;">candidates'</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">delListFromUFM</span> <span class="n" style="color: #333;">keep</span> <span class="o" style="font-weight: 600;">$</span></span>
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819
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">filterUFM</span> <span class="n" style="color: #333;">inRegOrBoth</span> <span class="o" style="font-weight: 600;">$</span></span>
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820
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="n" style="color: #333;">assig</span></span>
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<li id="e7e32ef13a93a68891f700047f89c45df0e3772d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#e7e32ef13a93a68891f700047f89c45df0e3772d"><strong>compiler/GHC/CmmToAsm/Reg/Linear/Base.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">@@ -30,6 +30,7 @@ import GHC.Types.Unique.FM</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Supply</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.BlockId</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ReadingOrWriting</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Reading</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Writing</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Ord</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="cd">-- | Used to store the register assignment on entry to a basic block.</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use this to handle join points, where multiple branch instructions</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">@@ -138,6 +139,8 @@ data RA_State freeRegs</td>
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138
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ra_config</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">NCGConfig</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | (from,fixup,to) : We inserted fixup code between from and to</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ra_fixups</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">)]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ra_fixups</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">BlockId</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#b3464ce8651c663fa952441e77c36955a283cd00"><strong>compiler/GHC/CmmToAsm/Reg/Linear/PPC.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 GeneralizedNewtypeDeriving #-}</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="cd">-- | Free regs map for PowerPC</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.CmmToAsm.Reg.Linear.PPC</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC5" 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">@@ -27,6 +29,9 @@ import Data.Bits</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Word32</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Word32</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The Show is used in an ASSERT</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">show</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="mi" style="color: #099;">0</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#9c35bb499c0b984f0940353f6f8514d39fe10870"><strong>compiler/GHC/CmmToAsm/Reg/Linear/SPARC.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 CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GeneralizedNewtypeDeriving #-}</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cd">-- | Free regs map for SPARC</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.CmmToAsm.Reg.Linear.SPARC</span> <span class="kr" style="font-weight: 600;">where</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">@@ -38,6 +39,9 @@ data FreeRegs</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showFreeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">showFreeRegs</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cd">-- | A reg map where no regs are free to be allocated.</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="mi" style="color: #099;">0</span> <span class="mi" style="color: #099;">0</span> <span class="mi" style="color: #099;">0</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#8fc0cb54eee9a1662a2e0ced10fc6eef66561a72"><strong>compiler/GHC/CmmToAsm/Reg/Linear/State.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 CPP, PatternSynonyms, DeriveFunctor #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" 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="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" 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="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#8a5d5b6d1415946cdbebc680a0c9d26ebca2a497"><strong>compiler/GHC/CmmToAsm/Reg/Linear/X86.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 GeneralizedNewtypeDeriving #-}</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="cd">-- | Free regs map for i386</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.CmmToAsm.Reg.Linear.X86</span> <span class="kr" style="font-weight: 600;">where</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">@@ -9,12 +10,13 @@ import GHC.Platform.Reg.Class</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform.Reg</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bits</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="kt" style="color: #458; font-weight: 600;">Word32</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Show</span></span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Show</span></span><span class="p"><span class="idiff">,</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="mi" style="color: #099;">0</span></span>
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<li id="c2a3ab492c92cc765c97d9d8a6537aacdd65f1f9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#c2a3ab492c92cc765c97d9d8a6537aacdd65f1f9"><strong>compiler/GHC/CmmToAsm/Reg/Linear/X86_64.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 GeneralizedNewtypeDeriving #-}</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="cd">-- | Free regs map for x86_64</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.CmmToAsm.Reg.Linear.X86_64</span> <span class="kr" style="font-weight: 600;">where</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">@@ -9,12 +10,13 @@ import GHC.Platform.Reg.Class</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform.Reg</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span></span>
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bits</span></span>
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17
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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16
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="kt" style="color: #458; font-weight: 600;">Word64</span></span>
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17
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Show</span></span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Show</span></span><span class="p"><span class="idiff">,</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Outputable</span></span><span class="p"><span class="idiff right">)</span></span></span>
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18
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20
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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19
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeRegs</span> <span class="mi" style="color: #099;">0</span></span>
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<li id="2e5692f568fd7b67a6b172e2a60469da8392508c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#2e5692f568fd7b67a6b172e2a60469da8392508c"><strong>compiler/GHC/Driver/Flags.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="181" 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="diff-line-num unfold js-unfold new_line" data-linenumber="181" 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">@@ -181,6 +181,7 @@ data GeneralFlag</td>
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181
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_LlvmFillUndefWithGarbage</span> <span class="c1" style="color: #998; font-style: italic;">-- Testing for undef bugs (hidden flag)</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_IrrefutableTuples</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmSink</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmStaticPred</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmElimCommonBlocks</span></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_AsmShortcutting</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_OmitYields</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.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">@@ -3514,6 +3514,7 @@ fFlagsDeps = [</td>
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3514
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<pre style="margin: 0;"> <span id="LC3514" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"case-folding"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CaseFolding</span><span class="p">,</span></span>
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3515
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<pre style="margin: 0;"> <span id="LC3515" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"cmm-elim-common-blocks"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmElimCommonBlocks</span><span class="p">,</span></span>
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3516
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<pre style="margin: 0;"> <span id="LC3516" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"cmm-sink"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmSink</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC3517" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"cmm-static-pred"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmStaticPred</span><span class="p">,</span></span>
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3517
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3518
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<pre style="margin: 0;"> <span id="LC3518" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"cse"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CSE</span><span class="p">,</span></span>
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3518
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3519
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<pre style="margin: 0;"> <span id="LC3519" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"stg-cse"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_StgCSE</span><span class="p">,</span></span>
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3519
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3520
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<pre style="margin: 0;"> <span id="LC3520" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"stg-lift-lams"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_StgLiftLams</span><span class="p">,</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">@@ -4065,6 +4066,7 @@ optLevelFlags -- see Note [Documenting optimisation flags]</td>
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4065
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4066
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<pre style="margin: 0;"> <span id="LC4066" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmElimCommonBlocks</span><span class="p">)</span></span>
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4066
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4067
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<pre style="margin: 0;"> <span id="LC4067" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_AsmShortcutting</span><span class="p">)</span></span>
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4067
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4068
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<pre style="margin: 0;"> <span id="LC4068" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmSink</span><span class="p">)</span></span>
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4069
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<pre style="margin: 0;">+<span id="LC4069" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CmmStaticPred</span><span class="p">)</span></span>
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4068
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4070
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<pre style="margin: 0;"> <span id="LC4070" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CSE</span><span class="p">)</span></span>
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4069
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4071
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<pre style="margin: 0;"> <span id="LC4071" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_StgCSE</span><span class="p">)</span></span>
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4072
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<pre style="margin: 0;"> <span id="LC4072" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_StgLiftLams</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f"><strong>compiler/GHC/Utils/Outputable.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">@@ -837,6 +837,9 @@ instance Outputable Word16 where</td>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Word32</span> <span class="kr" style="font-weight: 600;">where</span></span>
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">integer</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">n</span></span>
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839
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Word64</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">integer</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">integer</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-notes.rst</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">@@ -10,7 +10,14 @@ following sections.</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">Highlights</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">----------</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext">- TODO</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">* NCG</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> - The linear register allocator saw improvements reducing the number</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> of redundant move instructions. Rare edge cases can see double</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> digit improvements in runtime for inner loops.</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> In the mean this improved runtime by about 0.8%. For details</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> see ticket #17823.</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">Full details</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">------------</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">@@ -155,11 +162,11 @@ Arrow notation</td>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="plaintext"> ``hsGroupTopLevelFixitySigs`` function, which collects all top-level fixity</span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="plaintext"> signatures, including those for class methods defined inside classes.</span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="plaintext">- The ``Exception`` module was boiled down acknowledging the existence of<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">- The ``Exception`` module was boiled down acknowledging the existence of</span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext"> the ``exceptions`` dependency. In particular, the ``ExceptionMonad``</span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext"> class is not a proper class anymore, but a mere synonym for ``MonadThrow``,</span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="plaintext"> ``MonadCatch``, ``MonadMask`` (all from ``exceptions``) and ``MonadIO``.<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="plaintext"> All of ``g*``-functions from the module (``gtry``, ``gcatch``, etc.) are<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext"> ``MonadCatch``, ``MonadMask`` (all from ``exceptions``) and ``MonadIO``.</span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext"> All of ``g*``-functions from the module (``gtry``, ``gcatch``, etc.) are</span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext"> erased, and their ``exceptions``-alternatives are meant to be used in the</span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="plaintext"> GHC code instead.</span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990#2e45f2cd303dd998950a7c8042e796a5b2abd64f"><strong>docs/users_guide/using-optimisation.rst</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">@@ -214,6 +214,19 @@ by saying ``-fno-wombat``.</td>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="plaintext"> to their usage sites. It also inlines simple expressions like</span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="plaintext"> literals or registers.</span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="plaintext">.. ghc-flag:: -fcmm-static-pred</span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext"> :shortdesc: Enable static control flow prediction. Implied by :ghc-flag:`-O`.</span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext"> :type: dynamic</span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="plaintext"> :reverse: -fno-cmm-static-pred</span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext"> :category:</span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="plaintext"> :default: off but enabled with :ghc-flag:`-O`.</span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="plaintext"> This enables static control flow prediction on the final Cmm</span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="plaintext"> code. If enabled GHC will apply certain heuristics to identify</span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="plaintext"> loops and hot code paths. This information is then used by the</span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="plaintext"> register allocation and code layout passes.</span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext">.. ghc-flag:: -fasm-shortcutting</span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="plaintext"> :shortdesc: Enable shortcutting on assembly. Implied by :ghc-flag:`-O2`.</span>
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<td class="diff-line-num new_line" data-linenumber="232" 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">
232
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="plaintext"> :type: dynamic</span>
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