[PATCH] D127514: [RISCV] Implement isElementTypeLegalForScalableVector TTI hook

[Philip Reames via Phabricator via llvm-commits]

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This brings us into alignment with AArch64, and in the process fixes a compile crash bug in uniform store handling in the vectorizer.

Before the recent invalid cost bailout work, this would have also avoided crashes on invalid costs in some cases.  I honestly thing the vectorizer should gracefully bailout on uniform stores it can't use a scatter for, but it doesn't, so lets take the path of least resistance here.  It's also possible that there are other vectorizer bugs AArch64 isn't seeing because of this hook; we don't want to be finding them either.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127514

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
  llvm/test/Transforms/LoopVectorize/RISCV/illegal-type.ll

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