[PATCH] D23134: Make cltz and cttz zero undef when the operand cannot be zero in InstCombine

[Sanjay Patel via llvm-commits]

spatel added a comment.

For reference, the ctpop side of this patch is one of the missing folds noted in PR28668:
https://llvm.org/bugs/show_bug.cgi?id=28668


https://reviews.llvm.org/D23134