[PATCH] D52075: [InstCombine] Support (sub (sext x), (sext y)) --> (sext (sub x, y)) and (sub (zext x), (zext y)) --> (zext (sub x, y))

[Sanjay Patel via Phabricator via llvm-commits]

spatel accepted this revision.
spatel added a comment.
This revision is now accepted and ready to land.

LGTM - but please add at least one negative test where the math actually could overflow, so we verify that the value tracking is in place.


Repository:
  rL LLVM

https://reviews.llvm.org/D52075