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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/27ea955ba4ed6d547ac86428bbe95272652a48dc">27ea955b</a></strong>
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<span>by Moritz Angermann</span>
<i>at 2020-07-11T13:36:56+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add latest opt changes.
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<h4>1 changed file:</h4>
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<a href="#6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b">
compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
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<h4>Changes:</h4>
<li id="6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27ea955ba4ed6d547ac86428bbe95272652a48dc#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">@@ -601,16 +601,20 @@ getRegister' config plat expr</td>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- XXX: for now we'll only implement the 64bit versions. And rely on the</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fallthrough to alert us if things go wrong!</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- OPTIMIZATION WARNING: Dyadic CmmMachOp destructuring</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 0. XXX This should not exist! Rewrite: Reg +- 0 -> Reg</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Add</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">expr'</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmGlobal</span> <span class="n" style="color: #333;">r</span><span class="p">)),</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmInt</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</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;">config</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">expr'</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Sub</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">expr'</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmGlobal</span> <span class="n" style="color: #333;">r</span><span class="p">)),</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmInt</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</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;">config</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">expr'</span></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. Compute Reg +/- n directly.</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For Add/Sub we can directly encode 12bits, or 12bits lsl #12.</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Add</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmGlobal</span> <span class="n" style="color: #333;">r</span><span class="p">)),</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmInt</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"getRegister:CmmMachOp:Add:Imm is 0"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Add</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="n" style="color: #333;">reg</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmGlobal</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)),</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmInt</span> <span class="n" style="color: #333;">n</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC610" 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="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span> <span class="p">(</span><span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unitOL</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ANN</span> <span class="p">(</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 class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">d</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;">w'</span> <span class="n" style="color: #333;">r'</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;">ImmInteger</span> <span class="n" style="color: #333;">n</span><span class="p">))))</span></span>
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- XXX: 12bits lsl #12; e.g. lower 12 bits of n are 0; shift n >> 12, and set lsl to #12.</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- OPTIMIZATION WARNING: This only works because reg is CmmGlobal</span></span>
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">w'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">formatToWidth</span> <span class="p">(</span><span class="n" style="color: #333;">cmmTypeFormat</span> <span class="p">(</span><span class="n" style="color: #333;">cmmRegType</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">reg</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">r'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getRegisterReg</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">reg</span></span>
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612
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Sub</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="n" style="color: #333;">reg</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmGlobal</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)),</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmInt</span> <span class="n" style="color: #333;">n</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)]</span></span>
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613
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616
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<pre style="margin: 0;"> <span id="LC616" 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="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;">w</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;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unitOL</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ANN</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SUB</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">d</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;">w'</span> <span class="n" style="color: #333;">r'</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;">ImmInteger</span> <span class="n" style="color: #333;">n</span><span class="p">))))</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- XXX: 12bits lsl #12; e.g. lower 12 bits of n are 0; shift n >> 12, and set lsl to #12.</span></span>
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614
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618
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- OPTIMIZATION WARNING: This only works because reg is CmmGlobal</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">w'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">formatToWidth</span> <span class="p">(</span><span class="n" style="color: #333;">cmmTypeFormat</span> <span class="p">(</span><span class="n" style="color: #333;">cmmRegType</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">reg</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="n" style="color: #333;">r'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getRegisterReg</span> <span class="n" style="color: #333;">plat</span> <span class="n" style="color: #333;">reg</span></span>
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