[PATCH] D121771: [RISCV] Add basic cost model for vector casting

[Yeting Kuo via Phabricator via llvm-commits]

fakepaper56 added a comment.

I also want to handle scalable vector type. `useRVVForFixedLengthVectors` is used to make sure fixed vectors like `<4 x i8>` are legal. But I found that it is redundant for `isTypeLegal` testing.


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https://reviews.llvm.org/D121771