[PATCH] D65360: [AArch64][GlobalISel] Eliminate redundant G_ZEXT when the source is implicitly zext-loaded

[Amara Emerson via Phabricator via llvm-commits]

aemerson added a comment.

In D65360#1603454 <https://reviews.llvm.org/D65360#1603454>, @arsenm wrote:

> Shouldn’t the combiner have already gotten his?


It does catch these cases, but sometimes these patterns arise later after the combiner due to some other optimization or DCE. By then the combiner has already run so we don’t merge these into G_ZEXTLOAD.


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https://reviews.llvm.org/D65360