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<h3>
Moritz Angermann pushed to branch wip/angerman/aarch64-ncg
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b942b00339f3eb7ba85d0d8dd8bf650f71c9b7">65b942b0</a></strong>
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<span>by Moritz Angermann</span>
<i>at 2020-07-20T12:37:09+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Address Takenobus observations!
Thanks!
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<h4>2 changed files:</h4>
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<a href="#6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b">
compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
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compiler/GHC/CmmToAsm/AArch64/Instr.hs
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<h4>Changes:</h4>
<li id="6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b942b00339f3eb7ba85d0d8dd8bf650f71c9b7#6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b"><strong>compiler/GHC/CmmToAsm/AArch64/CodeGen.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">@@ -583,7 +583,7 @@ getRegister' config plat expr</td>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- UBFM will set the high bits to 0. SBFM will copy the sign (sign extend).</span></span>
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584
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_UU_Conv</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="o" style="font-weight: 600;">-></span> <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;">Any</span> <span class="p">(</span><span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">dst</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">code</span> <span class="p">`</span><span class="n" style="color: #333;">snocOL</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">UBFM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="p">(</span><span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="p">(</span><span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="n" style="color: #333;">reg</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">0</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">toImm</span> <span class="p">(</span><span class="n" style="color: #333;">min</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="LC585" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_SS_Conv</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="o" style="font-weight: 600;">-></span> <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;">Any</span> <span class="p">(</span><span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">dst</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">code</span> <span class="p">`</span><span class="n" style="color: #333;">snocOL</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">SBFM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="p">(</span><span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="p">(</span><span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="n" style="color: #333;">reg</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">0</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">toImm</span> <span class="p">(</span><span class="n" style="color: #333;">min</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="LC586" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_FF_Conv</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">in</span>tFormat</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">dst</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">code</span> <span class="p">`</span><span class="n" style="color: #333;">snocOL</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">FCVT</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">reg</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_FF_Conv</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">floa</span>tFormat</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">dst</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">code</span> <span class="p">`</span><span class="n" style="color: #333;">snocOL</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">FCVT</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">reg</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Conversions</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_XX_Conv</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">swizzleRegisterRep</span> <span class="p">(</span><span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">to</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getRegister</span> <span class="n" style="color: #333;">e</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b942b00339f3eb7ba85d0d8dd8bf650f71c9b7#807babf5b215890881c92043bcd08486141a405c"><strong>compiler/GHC/CmmToAsm/AArch64/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">@@ -387,7 +387,7 @@ aarch64_mkLoadInstr config reg delta slot | (spillSlotToOffset config slot) - de</td>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">delta'</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">spillSlotToOffset</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">slot</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">delta</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="n" style="color: #333;">aarch64_mkLoadInstr</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">reg</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">slot</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spillSlotToOffset</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">slot</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;"><</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">4095</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="n" style="color: #333;">isns</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">aarch64_mkLoadInstr</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">reg</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">409<span class="idiff left right">6</span></span><span class="p">)</span> <span class="n" style="color: #333;">slot</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="n" style="color: #333;">isns</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">aarch64_mkLoadInstr</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">reg</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">409<span class="idiff left right">5</span></span><span class="p">)</span> <span class="n" style="color: #333;">slot</span></span>
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">sp</span> <span class="n" style="color: #333;">sp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">4095</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">isns</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SUB</span> <span class="n" style="color: #333;">sp</span> <span class="n" style="color: #333;">sp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">4095</span><span class="p">))])</span></span>
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"><span class="n" style="color: #333;">aarch64_mkLoadInstr</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">reg</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">slot</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spillSlotToOffset</span> <span class="n" style="color: #333;">config</span> <span class="n" style="color: #333;">slot</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;"><</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">256</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">@@ -470,8 +470,8 @@ aarch64_mkStackDeallocInstr :: Platform -> Int -> [Instr]</td>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">aarch64_mkStackDeallocInstr</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">4096</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">sp</span> <span class="n" style="color: #333;">sp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC473" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">sp</span> <span class="n" style="color: #333;">sp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">4095</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">aarch64_mkStack<span class="idiff left">AllocInstr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">platform</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-</span></span> <span class="mi" style="color: #099;">4095</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC474" class="line" lang="haskell"><span class="n" style="color: #333;">aarch64_mkStackDeallocInstr</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"aarch64_mkStack<span class="idiff left right">A</span>llocInstr"</span> <span class="p">(</span><span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">sp</span> <span class="n" style="color: #333;">sp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpImm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ImmInt</span> <span class="mi" style="color: #099;">4095</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">aarch64_mkStack<span class="idiff left">DeallocInstr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">platform</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">+</span></span> <span class="mi" style="color: #099;">4095</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"><span class="n" style="color: #333;">aarch64_mkStackDeallocInstr</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"aarch64_mkStack<span class="idiff left right">Dea</span>llocInstr"</span> <span class="p">(</span><span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC476" 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="LC477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See note [extra spill slots] in X86/Instr.hs</span></span>
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