[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#3830892 <https://reviews.llvm.org/D135078#3830892>, @arsenm wrote:

> This should have been caught and combined into g_sext_inreg, which should have folded out based on computeNumSignBits

The only place we have an opportunity to catch the extend before it gets legalized into shifts is in the artifact combiner, and this is just a code quality optimization so it shouldn't go there.


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