================
@@ -2519,6 +2519,73 @@ Value
*InstCombinerImpl::SimplifyDemandedUseFPClass(Instruction *I,
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;
----------------
jayfoad wrote:
But you can also get zero results from normal inputs, e.g. trunc(0.5) or
trunc(-0.5)
https://github.com/llvm/llvm-project/pull/174842
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