Simon Pilgrim ad3a7654dc [X86] combineCMP - peek through zero-extensions for X86cmp(zext(x0),0) zero tests (PR38960) ...

If we're comparing a value against zero, strip away any zero-extension and perform the comparison on the pre-extended value

Fixes #38308

Differential Revision: https://reviews.llvm.org/D121472

2022-03-13 11:38:40 +00:00

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