[PATCH] D135078: [AArch64][GlobalISel] Fold away lowered vector sign-extend of vector compares

[Amara Emerson via Phabricator via llvm-commits]

aemerson added a comment.

In D135078#3831120 <https://reviews.llvm.org/D135078#3831120>, @paquette wrote:

> Why can't this be caught pre-legalize?

Because the sign-extend and the subsequent shifts only appear during legalization. Before that there’s nothing to combine.


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