[all-commits] [llvm/llvm-project] 2759cf: [AMDGPU] Remove unnecessary add instructions in ct...

[Leon Clark via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2759cfa0c35478b5a3bc1e51a1ed817d1b1dc39f
      https://github.com/llvm/llvm-project/commit/2759cfa0c35478b5a3bc1e51a1ed817d1b1dc39f
  Author: Leon Clark <PeddleSpam at users.noreply.github.com>
  Date:   2024-01-19 (Fri, 19 Jan 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
    M llvm/test/CodeGen/AMDGPU/ctlz.ll
    M llvm/test/CodeGen/AMDGPU/ctlz_zero_undef.ll

  Log Message:
  -----------
  [AMDGPU] Remove unnecessary add instructions in ctlz.i8 (#77615)

Add custom lowering for ctlz.i8 to avoid multiple add/sub operations.

---------

Co-authored-by: Leon Clark <leoclark at amd.com>
Co-authored-by: Matt Arsenault <Matthew.Arsenault at amd.com>