[PATCH] D123374: [InstCombine] Fold (A & 2^C1) + A => A & (2^C1 - 1) iff bit C1 in A is a sign bit (PR21929)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 424213.
RKSimon added a comment.

rebase now that we have a (negative) non-pow2 test


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123374/new/

https://reviews.llvm.org/D123374

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/add-mask.ll
  llvm/test/Transforms/InstCombine/modulo.ll

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