[llvm] [InstCombine] Generalize ignoreSignBitOfZero/NaN to handle more cases (PR #141015)

[Nikita Popov via llvm-commits]

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@@ -6357,6 +6357,118 @@ std::optional<bool> llvm::computeKnownFPSignBit(const Value *V, unsigned Depth,
   return Known.SignBit;
 }
 
+/// Return true if the sign bit of result can be ignored by the user when the
+/// result is zero.
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nikic wrote:

No need to repeat comment here.

https://github.com/llvm/llvm-project/pull/141015