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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/3656dff8259199d0dab2d1a1f1b887c252a9c1a3">3656dff8</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-07-09T09:50:01-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: fix MO_S_Mul2 support (#18434)
The value indicating if the carry is useful wasn't taken into account.
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<h4>1 changed file:</h4>
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compiler/GHC/CmmToLlvm/CodeGen.hs
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<h4>Changes:</h4>
<li id="a49dbda5c8a9c380f638f55cf5ade791db0017cc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3656dff8259199d0dab2d1a1f1b887c252a9c1a3#a49dbda5c8a9c380f638f55cf5ade791db0017cc"><strong>compiler/GHC/CmmToLlvm/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">@@ -353,7 +353,7 @@ genCall (PrimTarget (MO_U_Mul2 w)) [dstH, dstL] [lhs, rhs] = runStmtsDecls $ do</td>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">statement</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Store</span> <span class="n" style="color: #333;">retL</span> <span class="n" style="color: #333;">dstRegL</span></span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">statement</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Store</span> <span class="n" style="color: #333;">retH</span> <span class="n" style="color: #333;">dstRegH</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">genCall</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrimTarget</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_S_Mul2</span> <span class="n" style="color: #333;">w</span><span class="p">))</span> <span class="p">[</span><span class="n" style="color: #333;">dstH</span><span class="p">,</span> <span class="n" style="color: #333;">dstL</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runStmtsDecls</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">genCall</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrimTarget</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_S_Mul2</span> <span class="n" style="color: #333;">w</span><span class="p">))</span> <span class="p">[</span><span class="n" style="color: #333;">dst<span class="idiff left">C</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dst</span>H</span><span class="p">,</span> <span class="n" style="color: #333;">dstL</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runStmtsDecls</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">width</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">widthToLlvmInt</span> <span class="n" style="color: #333;">w</span></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"> <span class="n" style="color: #333;">bitWidth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">widthInBits</span> <span class="n" style="color: #333;">w</span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="n" style="color: #333;">width2x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LMInt</span> <span class="p">(</span><span class="n" style="color: #333;">bitWidth</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">2</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">@@ -373,10 +373,18 @@ genCall (PrimTarget (MO_S_Mul2 w)) [dstH, dstL] [lhs, rhs] = runStmtsDecls $ do</td>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="n" style="color: #333;">retShifted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doExprW</span> <span class="n" style="color: #333;">width2x</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">LlvmOp</span> <span class="kt" style="color: #458; font-weight: 600;">LM_MO_AShr</span> <span class="n" style="color: #333;">retV</span> <span class="n" style="color: #333;">widthLlvmLit</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- And extract them into retH.</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"> <span class="n" style="color: #333;">retH</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doExprW</span> <span class="n" style="color: #333;">width</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="kt" style="color: #458; font-weight: 600;">LM_Trunc</span> <span class="n" style="color: #333;">retShifted</span> <span class="n" style="color: #333;">width</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if the carry is useful by doing a full arithmetic right shift on</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- retL and comparing the result with retH</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">widthLlvmLitm1</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LMLitVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">LMIntLit</span> <span class="p">(</span><span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">bitWidth</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">width</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"> <span class="n" style="color: #333;">retH'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doExprW</span> <span class="n" style="color: #333;">width</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">LlvmOp</span> <span class="kt" style="color: #458; font-weight: 600;">LM_MO_AShr</span> <span class="n" style="color: #333;">retL</span> <span class="n" style="color: #333;">widthLlvmLitm1</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"> <span class="n" style="color: #333;">retC1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doExprW</span> <span class="n" style="color: #333;">i1</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Compare</span> <span class="kt" style="color: #458; font-weight: 600;">LM_CMP_Ne</span> <span class="n" style="color: #333;">retH</span> <span class="n" style="color: #333;">retH'</span> <span class="c1" style="color: #998; font-style: italic;">-- Compare op returns a 1-bit value (i1)</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"> <span class="n" style="color: #333;">retC</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doExprW</span> <span class="n" style="color: #333;">width</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="kt" style="color: #458; font-weight: 600;">LM_Zext</span> <span class="n" style="color: #333;">retC1</span> <span class="n" style="color: #333;">width</span> <span class="c1" style="color: #998; font-style: italic;">-- so we zero-extend it</span></span>
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376
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="n" style="color: #333;">dstRegL</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCmmRegW</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">dstL</span><span class="p">)</span></span>
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377
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383
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">dstRegH</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCmmRegW</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">dstH</span><span class="p">)</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">dstRegC</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCmmRegW</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">dstC</span><span class="p">)</span></span>
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378
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">statement</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Store</span> <span class="n" style="color: #333;">retL</span> <span class="n" style="color: #333;">dstRegL</span></span>
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379
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386
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="n" style="color: #333;">statement</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Store</span> <span class="n" style="color: #333;">retH</span> <span class="n" style="color: #333;">dstRegH</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="n" style="color: #333;">statement</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Store</span> <span class="n" style="color: #333;">retC</span> <span class="n" style="color: #333;">dstRegC</span></span>
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380
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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381
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389
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- MO_U_QuotRem2 is another case we handle by widening the registers to double</span></span>
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382
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390
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the width and use normal LLVM instructions (similarly to the MO_U_Mul2). The</span></span>
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