diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp index 421d49fdcb7..2d608e74b69 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp @@ -1830,6 +1830,8 @@ static Instruction *foldFNegIntoConstant(Instruction &I) { // Fold negation into constant operand. This is limited with one-use because // fneg is assumed better for analysis and cheaper in codegen than fmul/fdiv. // -(X * C) --> X * (-C) + // FIXME: It's arguable whether these should be m_OneUse or not. The current + // belief is that the FNeg allows for better reassociation opportunities. if (match(&I, m_FNeg(m_OneUse(m_FMul(m_Value(X), m_Constant(C)))))) return BinaryOperator::CreateFMulFMF(X, ConstantExpr::getFNeg(C), &I); // -(X / C) --> X / (-C) |
