================
@@ -2548,6 +2548,72 @@ Value
*InstCombinerImpl::SimplifyDemandedUseFPClass(Value *V,
return getFPClassConstant(VTy, ValidResults, /*IsCanonicalizing=*/true);
}
+ case Intrinsic::trunc:
+ case Intrinsic::floor:
+ case Intrinsic::ceil:
+ case Intrinsic::rint:
+ case Intrinsic::nearbyint:
+ case Intrinsic::round:
+ case Intrinsic::roundeven: {
+ FPClassTest DemandedSrcMask = DemandedMask;
+
+ // Zero results imply valid subnormal sources.
+ if (DemandedMask & fcNegZero)
+ DemandedSrcMask |= fcNegSubnormal;
+
+ if (DemandedMask & fcPosZero)
+ DemandedSrcMask |= fcPosSubnormal;
+
+ KnownFPClass KnownSrc;
+ if (SimplifyDemandedFPClass(CI, 0, DemandedSrcMask, KnownSrc, Depth + 1))
+ return I;
+
+ // Note: Possibly dropping snan quiet.
+ if (KnownSrc.isKnownAlways(fcInf | fcNan))
----------------
dtcxzyw wrote:
It also holds for fcZero.
https://github.com/llvm/llvm-project/pull/174842
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