[all-commits] [llvm/llvm-project] d8f929: [RISCV] Custom legalize BITREVERSE with Zbkb.

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d8f929a567083a6b90264193f1e4476f6b77c5fe
      https://github.com/llvm/llvm-project/commit/d8f929a567083a6b90264193f1e4476f6b77c5fe
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-01-28 (Fri, 28 Jan 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
    M llvm/test/CodeGen/RISCV/bswap-bitreverse.ll

  Log Message:
  -----------
  [RISCV] Custom legalize BITREVERSE with Zbkb.

With Zbkb, a bitreverse can be split into a rev8 and a brev8.

Reviewed By: VincentWu

Differential Revision: https://reviews.llvm.org/D118430