[PATCH] D99853: [InstSimplify] Teach isUndefValue to understand const vector with both undef & poison

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

This problem isn't really limited to this one function in InstSimplify. Might it make sense to adjust UndefValue to actually represent such constants? We'd have to add a bitmask to it that indicates which values are poison.


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https://reviews.llvm.org/D99853