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

[Simon Pilgrim via Phabricator via llvm-commits]

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

LGTM - I'd be interested to know if this will allow us to remove the x86 specific fold?


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  https://reviews.llvm.org/D128080/new/

https://reviews.llvm.org/D128080