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

Tue May 4 14:02:05 PDT 2021

xbolva00 abandoned this revision.
xbolva00 added a comment.

In D101840#2737160 <https://reviews.llvm.org/D101840#2737160>, @craig.topper wrote:

> 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.

ah, yes.

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