diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index 8c48dce81de..c96c2d62255 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -136,8 +136,13 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) { if (Value *V = SimplifyUsingDistributiveLaws(I)) return ReplaceInstUsesWith(I, V); - if (match(Op1, m_AllOnes())) // X * -1 == 0 - X - return BinaryOperator::CreateNeg(Op0, I.getName()); + // X * -1 == 0 - X + if (match(Op1, m_AllOnes())) { + BinaryOperator *BO = BinaryOperator::CreateNeg(Op0, I.getName()); + if (I.hasNoSignedWrap()) + BO->setHasNoSignedWrap(); + return BO; + } // Also allow combining multiply instructions on vectors. { |
