[PATCH] D103788: [InstCombine] Eliminate casts to optimize ctlz operation

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D103788#2810049 <https://reviews.llvm.org/D103788#2810049>, @lebedev.ri wrote:

> Right, it of course should be https://alive2.llvm.org/ce/z/wuRBBs

Note that this only works if the scalar bit width of original un-extended `%x` is at least `6`: https://alive2.llvm.org/ce/z/5ThC64
so i think we actually want to do https://alive2.llvm.org/ce/z/ZtZm4w


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