[PATCH] D145073: [InstCombine] fold signed absolute diff patterns

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 501869.
spatel added a comment.

Patch updated:

1. Match any pair of no-wrap subtracts.
2. But only propagate "nsw" with restrictions.

I added tests to try to make sure we are covering all of the variations and confirmed those and several others with Alive2.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D145073/new/

https://reviews.llvm.org/D145073

Files:
  llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
  llvm/test/Transforms/InstCombine/abs-1.ll

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