================
@@ -2196,9 +2196,25 @@ Value
*InstCombinerImpl::SimplifyDemandedUseFPClass(Value *V,
auto *FPOp = cast<FPMathOperator>(CI);
bool ChangedFlags = false;
+ if (!FPOp->hasNoSignedZeros()) {
+ // Add NSZ flag if we know the result will not be sensitive on the sign
+ // of 0.
+ FPClassTest ZeroMask = fcZero;
+
+ if (Mode != DenormalMode::getIEEE())
+ ZeroMask |= fcSubnormal;
+
+ bool ResultNotLogical0 = (ValidResults & ZeroMask) == fcNone;
+ if (ResultNotLogical0 ||
+ ((KnownLHS.isKnownNeverLogicalNegZero(Mode) ||
----------------
dtcxzyw wrote:
Wait for me a moment...
https://github.com/llvm/llvm-project/pull/173898
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