diff options
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 3a9e80c..eae6261 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -2670,9 +2670,9 @@ bool isKnownNonZero(const Value *V, const APInt &DemandedElts, unsigned Depth, return isKnownNonZero(I->getOperand(0), Depth, Q); case Instruction::Shl: { - // shl nuw can't remove any non-zero bits. + // shl nsw/nuw can't remove any non-zero bits. const OverflowingBinaryOperator *BO = cast<OverflowingBinaryOperator>(V); - if (Q.IIQ.hasNoUnsignedWrap(BO)) + if (Q.IIQ.hasNoUnsignedWrap(BO) || Q.IIQ.hasNoSignedWrap(BO)) return isKnownNonZero(I->getOperand(0), Depth, Q); // shl X, Y != 0 if X is odd. Note that the value of the shift is undefined |