[PATCH] D91877: [RISCV] Combine GREVI sequences

[Fraser Cormack via Phabricator via llvm-commits]

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This combine step performs the following type of transformation:

  rev.p a0, a0   # grevi a0, a0, 0b01
  rev2.n a0, a0  # grevi a0, a0, 0b10
  -->
  rev.n a0, a0   # grevi a0, a0, 0b11


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D91877

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rv32Zbp.ll
  llvm/test/CodeGen/RISCV/rv64Zbp.ll

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