diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp index 9d640e849dc..7e3d405e906 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp @@ -1676,12 +1676,16 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) { if (match(Op1, m_LShr(m_Value(X), m_APInt(ShAmt))) && *ShAmt == BitWidth - 1) { Value *ShAmtOp = cast<Instruction>(Op1)->getOperand(1); - return BinaryOperator::CreateAShr(X, ShAmtOp); + Instruction *NewShift = BinaryOperator::CreateAShr(X, ShAmtOp); + NewShift->copyIRFlags(Op1); + return NewShift; } if (match(Op1, m_AShr(m_Value(X), m_APInt(ShAmt))) && *ShAmt == BitWidth - 1) { Value *ShAmtOp = cast<Instruction>(Op1)->getOperand(1); - return BinaryOperator::CreateLShr(X, ShAmtOp); + Instruction *NewShift = BinaryOperator::CreateLShr(X, ShAmtOp); + NewShift->copyIRFlags(Op1); + return NewShift; } if (Op1->hasOneUse()) { |
