[PATCH] D110488: [InstCombine] Canonicalize ((X & -X) - 1) --> (~X & (X - 1)) (PR51784)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 455168.
RKSimon retitled this revision from "[InstCombine] Fold ctpop((x & -x ) - 1) -> cttz(x, false) (PR51784)" to "[InstCombine] Canonicalize ((X & -X) - 1) --> (~X & (X - 1)) (PR51784)".
RKSimon edited the summary of this revision.
RKSimon added a reviewer: nikic.
RKSimon added a comment.
Herald added a project: All.

Replaced the ctpop fold with a generic ((X & -X) - 1) --> (~X & (X - 1)) canonicalization


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110488/new/

https://reviews.llvm.org/D110488

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/add-mask-neg.ll
  llvm/test/Transforms/InstCombine/ctpop-cttz.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D110488.455168.patch
Type: text/x-patch
Size: 6264 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20220824/9399b922/attachment.bin>