[PATCH] D112754: X86: Fold masked merge pattern when and-not is not available

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

> Also, we have TargetLowering::hasAndNot - could we not use that and work to make this a generic combine?

Only some targets implement `hasAndNot`: AArch64, PowerPC, VE and X86. Some of the others provide hasAndNot implementations anyway and I've seen various failures in recognizing min/max/saturation patterns when implementing it. So unfortunately implementing this in a generic fashion is not really an option, hence I provide a generic helper function here that target authors can start to use when they made sure there's no accidental regressions.


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  https://reviews.llvm.org/D112754/new/

https://reviews.llvm.org/D112754