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Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp')
-rw-r--r--llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp10
1 files changed, 3 insertions, 7 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index 74e3dbb4..0ca62b7a 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -882,13 +882,9 @@ bool InstCombiner::WillNotOverflowSignedSub(Value *LHS, Value *RHS,
bool InstCombiner::WillNotOverflowUnsignedSub(Value *LHS, Value *RHS,
Instruction &CxtI) {
// If the LHS is negative and the RHS is non-negative, no unsigned wrap.
- bool LHSKnownNonNegative, LHSKnownNegative;
- bool RHSKnownNonNegative, RHSKnownNegative;
- ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, /*Depth=*/0,
- &CxtI);
- ComputeSignBit(RHS, RHSKnownNonNegative, RHSKnownNegative, /*Depth=*/0,
- &CxtI);
- if (LHSKnownNegative && RHSKnownNonNegative)
+ KnownBits LHSKnown = computeKnownBits(LHS, /*Depth=*/0, &CxtI);
+ KnownBits RHSKnown = computeKnownBits(RHS, /*Depth=*/0, &CxtI);
+ if (LHSKnown.isNegative() && RHSKnown.isNonNegative())
return true;
return false;