[PATCH] D47775: [AArch64][SVE] Add SPLAT_VECTOR ISD Node

[Graham Hunter via Phabricator via llvm-commits]

huntergr added a subscriber: hfinkel.
huntergr added a comment.

Hi James,

So I implemented a combine to do this, but ran into a problem -- namely that the design suggested by @hfinkel in the llvm-dev discussion (to expand to build_vector when the backend hasn't marked the splat_vector operation as supported) conflicts with the combine and ends up in an infinite loop.

For now I've guarded the combine with a check on whether the operation action has been changed from Expand for that type. Would this be acceptable?


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https://reviews.llvm.org/D47775