[PATCH] D118539: [InstCombine] try to fold one-demanded-bit-of-multiply

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I don't suppose this can handle D117995 <https://reviews.llvm.org/D117995>? If we can do this in SimplifyDemandedBits then we can add the knownbits fold with the additional NeverUndefOrPoison check.

Otherwise I think I'll just add a (DemandedMask ==2 && X == Y) -> 0 special case.


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  https://reviews.llvm.org/D118539/new/

https://reviews.llvm.org/D118539