[PATCH] D109151: [InstCombine] Convert xor (ashr X, BW-1), C -> select(X >=s 0, C, ~C)

[Dave Green via Phabricator via llvm-commits]

dmgreen updated this revision to Diff 377634.
dmgreen added a comment.

Sorry for the delay, other things came up. This is a rebase, plus makes used of m_APIntAllowUndef and moves the m_OneUse before the m_TruncOrSelf.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D109151/new/

https://reviews.llvm.org/D109151

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/truncating-saturate.ll
  llvm/test/Transforms/InstCombine/xor-ashr.ll

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