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| author | Sanjay Patel <spatel@rotateright.com> | 2019-12-08 10:05:28 -0500 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2019-12-08 10:08:02 -0500 |
| commit | 12f39e0fede92ca04c811660530e750585124ed2 (patch) | |
| tree | 12ec331edc3c97eb16e95a3cdb0e8fd6dd6e40b5 /llvm/lib/Analysis/InstructionSimplify.cpp | |
| parent | b32490270b786d2c5ba154e613ee2d5e36ed4197 (diff) | |
| download | bcm5719-llvm-12f39e0fede92ca04c811660530e750585124ed2.tar.gz bcm5719-llvm-12f39e0fede92ca04c811660530e750585124ed2.zip | |
[InstSimplify] fold copysign with negated operand
This is another transform suggested in PR44153:
https://bugs.llvm.org/show_bug.cgi?id=44153
The backend for some targets already manages to get
this if it converts copysign to bitwise logic.
Diffstat (limited to 'llvm/lib/Analysis/InstructionSimplify.cpp')
| -rw-r--r-- | llvm/lib/Analysis/InstructionSimplify.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp index 7942cb09e84..d151b78f04c 100644 --- a/llvm/lib/Analysis/InstructionSimplify.cpp +++ b/llvm/lib/Analysis/InstructionSimplify.cpp @@ -5090,6 +5090,9 @@ static Value *simplifyBinaryIntrinsic(Function *F, Value *Op0, Value *Op1, // copysign X, X --> X if (Op0 == Op1) return Op0; + // copysign -X, X --> X + if (match(Op0, m_FNeg(m_Specific(Op1)))) + return Op1; break; case Intrinsic::maxnum: case Intrinsic::minnum: |
