================
@@ -5553,6 +5553,37 @@ void computeKnownFPClass(const Value *V, const APInt
&DemandedElts,
// TODO: Copy inf handling from instructions
break;
+ case Intrinsic::amdgcn_rsq: {
+ KnownFPClass KnownSrc;
+ // The only negative value that can be returned is -0 for -0 inputs.
+ Known.knownNot(fcNegInf | fcNegSubnormal | fcNegNormal);
----------------
dtcxzyw wrote:
`rsq(-0.0) = -inf`.
https://github.com/llvm/llvm-project/pull/171837
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