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

Simon Pilgrim via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Sat Sep 25 13:20:32 PDT 2021

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RKSimon added a comment.

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


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D110488/new/

https://reviews.llvm.org/D110488

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