[PATCH] D101840: [InstCombine] ctlz(x) -> 0 if x is known negative number

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

In D101840#2736994 <https://reviews.llvm.org/D101840#2736994>, @xbolva00 wrote:

> Moved to InstCombine.

Your test already passes before your change. If the Known bits is negative, PossibleZeros and DefiniteZeros will both be 0 which triggers the PossibleZeros == DefiniteZeros case.


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