diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp index bdfbd75d31a..0b6b7c3c66d 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp @@ -711,9 +711,9 @@ static Value *canonicalizeSaturatedSubtract(const ICmpInst *ICI, else if (!match(TrueVal, m_Sub(m_Specific(A), m_Specific(B)))) return nullptr; - // If sub is used anywhere else, we wouldn't be able to eliminate it - // afterwards. - if (!TrueVal->hasOneUse()) + // If we are adding a negate and the sub and icmp are used anywhere else, we + // would end up with more instructions. + if (IsNegative && !TrueVal->hasOneUse() && !ICI->hasOneUse()) return nullptr; // (a > b) ? a - b : 0 -> usub.sat(a, b) |
