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InstCombine: fold fcmp (fneg x), (fneg y) -> fcmp x, y

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128627 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-03-31 10:12:22 +00:00
parent 0db50189dc
commit 68b4bd0a63
2 changed files with 14 additions and 0 deletions
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lib/Transforms/InstCombine/InstCombineCompares.cpp
+5
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@@ -2855,6 +2855,11 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) {
}
}
// fcmp (fneg x), (fneg y) -> fcmp x, y
Value *X, *Y;
if (match(Op0, m_FNeg(m_Value(X))) && match(Op1, m_FNeg(m_Value(Y))))
return new FCmpInst(I.getPredicate(), X, Y);
// fcmp (fpext x), (fpext y) -> fcmp x, y
if (FPExtInst *LHSExt = dyn_cast<FPExtInst>(Op0))
if (FPExtInst *RHSExt = dyn_cast<FPExtInst>(Op1))