[PATCH] D110488: [InstCombine] Fold ctpop((x & -x ) - 1) -> cttz(x, false) (PR51784)

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

In D110488#3022683 <https://reviews.llvm.org/D110488#3022683>, @RKSimon wrote:

> An alternative would be to decide if (~x & (x - 1)) or ((x & -x ) - 1) should be the canonical pattern?
>
> https://alive2.llvm.org/ce/z/WA_cmX

Yeah I was thinking about some more general pattern too. @spatel?


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