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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81560981fd9af7ea21b2592c405e9e22af838aab">81560981</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-11-04T16:48:42-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use LEA with 8-bit registers (#18614)
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<h4>3 changed files:</h4>
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<a href="#2bae5947e9412f6deebf4db7dcb89d780913130f">
compiler/GHC/CmmToAsm/X86/CodeGen.hs
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+
testsuite/tests/codeGen/should_compile/T18614.hs
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<a href="#6b1c188363067aa37c05e3a281dad45535511b14">
testsuite/tests/codeGen/should_compile/all.T
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<h4>Changes:</h4>
<li id="2bae5947e9412f6deebf4db7dcb89d780913130f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81560981fd9af7ea21b2592c405e9e22af838aab#2bae5947e9412f6deebf4db7dcb89d780913130f"><strong>compiler/GHC/CmmToAsm/X86/CodeGen.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1052" 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="1052" 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">@@ -1052,7 +1052,9 @@ getRegister' _ is32Bit (CmmMachOp mop [x, y]) = -- dyadic MachOps</td>
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1052
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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1053
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"> <span class="n" style="color: #333;">add_code</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Width</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatM</span> <span class="kt" style="color: #458; font-weight: 600;">Register</span></span>
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1054
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <span class="n" style="color: #333;">add_code</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</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;">y</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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1055
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<td class="diff-line-num new_line old" data-linenumber="1055" 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="LC1055" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is32BitInteger</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_int</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is32BitInteger</span> <span class="n" style="color: #333;">y</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">W8</span> <span class="c1" style="color: #998; font-style: italic;">-- LEA doesn't support byte size (#18614)</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_int</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1056
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="n" style="color: #333;">add_code</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trivialCode</span> <span class="n" style="color: #333;">rep</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">format</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ADD</span> <span class="n" style="color: #333;">format</span><span class="p">))</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1057
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">format</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">rep</span></span>
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1058
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: There are other interesting patterns we want to replace</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1061" 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="1063" 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">@@ -1061,7 +1063,9 @@ getRegister' _ is32Bit (CmmMachOp mop [x, y]) = -- dyadic MachOps</td>
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1061
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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1062
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="n" style="color: #333;">sub_code</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Width</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatM</span> <span class="kt" style="color: #458; font-weight: 600;">Register</span></span>
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1063
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="n" style="color: #333;">sub_code</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</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;">y</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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1064
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<pre style="margin: 0;">-<span id="LC1064" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is32BitInteger</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_int</span> <span class="n" style="color: #333;">rep</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;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is32BitInteger</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">W8</span> <span class="c1" style="color: #998; font-style: italic;">-- LEA doesn't support byte size (#18614)</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_int</span> <span class="n" style="color: #333;">rep</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;">y</span><span class="p">)</span></span>
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="n" style="color: #333;">sub_code</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trivialCode</span> <span class="n" style="color: #333;">rep</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SUB</span> <span class="p">(</span><span class="n" style="color: #333;">intFormat</span> <span class="n" style="color: #333;">rep</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- our three-operand add instruction:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81560981fd9af7ea21b2592c405e9e22af838aab#6acf043a97aa875c79874ffd6c4cb7851c389be1"><strong>testsuite/tests/codeGen/should_compile/T18614.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 MagicHash, UnboxedTuples #-}</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;">{-# OPTIONS_GHC -O #-}</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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</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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<pre style="margin: 0;">+<span id="LC6" 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="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">test</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word8</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;">Word8</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="n" style="color: #333;">test</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">plusWord8</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="n" style="color: #333;">narrowWord8</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></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81560981fd9af7ea21b2592c405e9e22af838aab#6b1c188363067aa37c05e3a281dad45535511b14"><strong>testsuite/tests/codeGen/should_compile/all.T</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">@@ -101,3 +101,5 @@ test('T15570',</td>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-Wno-overflowed-literals</span><span class="p">'])</span></span>
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102
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="perl"> <span class="c1" style="color: #998; font-style: italic;"># skipped with CmmToC because it generates a warning:</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="perl"> <span class="c1" style="color: #998; font-style: italic;"># warning: integer constant is so large that it is unsigned</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18614</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="p">[''])</span></span></pre>
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