Simon Pilgrim 38c799bce8 [X86] Fold cmpeq/ne(and(X,Y),Y) --> cmpeq/ne(and(~X,Y),0) ...

Followup to D100177, handle an similar (demorgan inverse style) case from PR47797 as well

The AVX512 test cases could be further improved if we folded not(iX bitcast(vXi1)) -> (iX bitcast(not(vXi1)))

Alive2: https://alive2.llvm.org/ce/z/AnA_-W

2021-04-11 18:42:01 +01:00

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