[PATCH] D149462: [RISCV] Rewrite isLegalElementTypeForRVV in terms of ValueTypes [nfc]

[Philip Reames via Phabricator via llvm-commits]

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This was briefly mentioned as a possibility in review discussion on D149369 <https://reviews.llvm.org/D149369>.

One slightly surprising bit to call out - these interfaces can get invoked with non-vector typed arguments.  LoopVectorizer likes to call the costing interfaces with scalar types when unrolling, but not vectorizing.  I found that surprising, not sure if others do.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149462

Files:
  llvm/lib/Target/RISCV/RISCVGatherScatterLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h

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