diff options
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index d50ccd8..6602db4 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -2816,6 +2816,8 @@ static bool isKnownNonZeroFromOperator(const Operator *I, case Intrinsic::bswap: case Intrinsic::ctpop: return isKnownNonZero(II->getArgOperand(0), DemandedElts, Depth, Q); + // NB: We don't do usub_sat here as in any case we can prove its + // non-zero, we will fold it to `sub nuw` in InstCombine. case Intrinsic::ssub_sat: return isNonZeroSub(DemandedElts, Depth, Q, BitWidth, II->getArgOperand(0), II->getArgOperand(1)); |