Sanjay Patel f58e0513dd [x86] try harder to lower to PCMPGT instead of not-of-PCMPEQ ...

This is motivated by the example in https://llvm.org/PR50055 ,
but it doesn't do anything for that bug currently because we
don't actually have a zero-extended setcc there.

Proof for the generic transform (inverse of what we would
try to do in combining):
https://alive2.llvm.org/ce/z/aBL-Mg

Differential Revision: https://reviews.llvm.org/D102275

2021-05-12 08:25:29 -04:00

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