[all-commits] [llvm/llvm-project] 28a3e7: [RISCV] Override hasAndNotCompare to use more andn...

[Jianjian Guan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 28a3e7dea2abb673c3dd3c08c111a6b00875bfb3
      https://github.com/llvm/llvm-project/commit/28a3e7dea2abb673c3dd3c08c111a6b00875bfb3
  Author: jacquesguan <jacquesguan at me.com>
  Date:   2021-12-23 (Thu, 23 Dec 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/test/CodeGen/RISCV/rv32zbb-zbp.ll
    M llvm/test/CodeGen/RISCV/rv64zbb-zbp.ll

  Log Message:
  -----------
  [RISCV] Override hasAndNotCompare to use more andn when have Zbb extension.

Enable transform (X & Y) == Y ---> (~X & Y) == 0 and (X & Y) != Y ---> (~X & Y) != 0 when have Zbb extension to use more andn instruction.

Differential Revision: https://reviews.llvm.org/D115922