[PATCH] D128080: [SDAG] convert sub from (Pow2-1) constant into xor

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

I put up D128123 <https://reviews.llvm.org/D128123> as the potential better/final patch, so we can see the current test diffs.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128080/new/

https://reviews.llvm.org/D128080