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<h3>
Ben Gamari pushed to branch wip/T18141
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/6f82de4a5df4f14b19595f4996b58c9b901e30fc">6f82de4a</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-05T17:41:48-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Cmm.Opt: Handle MO_XX_Conv
This MachOp was introduced by 2c959a1894311e59cd2fd469c1967491c1e488f3
but a wildcard match in cmmMachOpFoldM hid the fact that it wasn't
handled. Ideally we would eliminate the match but this appears to be a
larger task.
Fixes #18141.
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<h4>3 changed files:</h4>
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<a href="#00c27365316e033b00cc3ed3854ac8714d25a2b5">
compiler/GHC/Cmm/Opt.hs
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+
testsuite/tests/cmm/opt/T18141.hs
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<li class="file-stats">
<a href="#40db7feb1282e4891cfcfca3a986778333c81855">
testsuite/tests/cmm/opt/all.T
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<h4>Changes:</h4>
<li id="00c27365316e033b00cc3ed3854ac8714d25a2b5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f82de4a5df4f14b19595f4996b58c9b901e30fc#00c27365316e033b00cc3ed3854ac8714d25a2b5"><strong>compiler/GHC/Cmm/Opt.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">@@ -69,6 +69,7 @@ cmmMachOpFoldM _ op [CmmLit (CmmInt x rep)]</td>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MO_SF_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="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmFloat</span> <span class="p">(</span><span class="n" style="color: #333;">fromInteger</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">to</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC70" 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="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="p">(</span><span class="n" style="color: #333;">narrowS</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">to</span><span class="p">)</span></span>
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71
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<pre style="margin: 0;"> <span id="LC71" 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="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="p">(</span><span class="n" style="color: #333;">narrowU</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">to</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC72" 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="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="p">(</span><span class="n" style="color: #333;">narrowS</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">to</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC74" 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;">panic</span> <span class="o" style="font-weight: 600;">$</span> <span class="s" style="color: #d14;">"cmmMachOpFoldM: unknown unary op: "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">op</span></span>
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74
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75
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="76" 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="77" 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">@@ -76,6 +77,7 @@ cmmMachOpFoldM _ op [CmmLit (CmmInt x rep)]</td>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Eliminate conversion NOPs</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="n" style="color: #333;">cmmMachOpFoldM</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_SS_Conv</span> <span class="n" style="color: #333;">rep1</span> <span class="n" style="color: #333;">rep2</span><span class="p">)</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="n" style="color: #333;">rep1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">rep2</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;">x</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="n" style="color: #333;">cmmMachOpFoldM</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_UU_Conv</span> <span class="n" style="color: #333;">rep1</span> <span class="n" style="color: #333;">rep2</span><span class="p">)</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="n" style="color: #333;">rep1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">rep2</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;">x</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">cmmMachOpFoldM</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_XX_Conv</span> <span class="n" style="color: #333;">rep1</span> <span class="n" style="color: #333;">rep2</span><span class="p">)</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="n" style="color: #333;">rep1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">rep2</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;">x</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Eliminate nested conversions where possible</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"><span class="n" style="color: #333;">cmmMachOpFoldM</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">conv_outer</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="n" style="color: #333;">conv_inner</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]]</span></span>
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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 MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18141</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">divInt8</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;">Int8</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;">Int8</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;">Int8</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">divInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">gtInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">zero</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">ltInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">zero</span><span class="o" 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="LC10" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">subInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">one</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">quotInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">subInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">one</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">ltInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">zero</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">gtInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">zero</span><span class="o" 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="LC12" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">plusInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">one</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">quotInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">subInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">one</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC13" 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;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">quotInt8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">zero</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">narrowInt8</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>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">one</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">narrowInt8</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span></pre>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Verify that we optimize away conditional branches which always jump</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># to the same target.</span></span>
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15188</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18141</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">)</span></span></pre>
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