[PATCH] D155698: [RISCV] Add more patterns for vnsr[a,l].wx

[Luke Lau via Phabricator via llvm-commits]

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We're currently only matching scalar shift amounts where the type is the same
as the vector element type. But because only the bottom log2(2*SEW) bits are
used, only 7 bits will be used at most so we can use any scalar type >= i8.

This patch adds patterns for the case above, as well as for when the shift
amount type is the same as the widened element type and doesn't need extended.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155698

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
  llvm/test/CodeGen/RISCV/rvv/ctlz-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/cttz-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vnsra-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vnsrl-sdnode.ll

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