[PATCH] D158195: [RISCV] Combine (vrot{l,r} vxi16, 8) -> vrev8

[Luke Lau via Phabricator via llvm-commits]

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There is an equivalent generic combine on ISD::ROT{L,R}, but on fixed vectors
they are legalized before they have the chance to be combined. This patch adds
a RISC-V specific combine to handle it in VL node form.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158195

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-reverse.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-rotate.ll

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