[PATCH] D136582: [InstCombine] fold sub pattern to and

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

I don't know if it would have any effect on this patch, but we seem to be missing a constant-shrinking (DemandedBits) opportunity for sub nuw:
https://alive2.llvm.org/ce/z/7Lb_Dy

We can clear high-bits of the mask constant based on the highest bit set in the subtract constant.


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