[all-commits] [llvm/llvm-project] 6ef6c9: [AMDGPU] Reorder atomic optimizer to avoid CAS loop.

[Pravin Jagtap via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6ef6c954c6dcd34b99897cc00da9bf1b651398b5
      https://github.com/llvm/llvm-project/commit/6ef6c954c6dcd34b99897cc00da9bf1b651398b5
  Author: Pravin Jagtap <Pravin.Jagtap at amd.com>
  Date:   2023-08-30 (Wed, 30 Aug 2023)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/global-atomic-fadd.f32-no-rtn.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/global-atomic-fadd.f32-rtn.ll
    M llvm/test/CodeGen/AMDGPU/atomic-optimizer-strict-wqm.ll
    M llvm/test/CodeGen/AMDGPU/atomic_optimizations_pixelshader.ll
    M llvm/test/CodeGen/AMDGPU/global-atomic-fadd.f32-no-rtn.ll
    M llvm/test/CodeGen/AMDGPU/global-atomic-fadd.f32-rtn.ll
    M llvm/test/CodeGen/AMDGPU/global-atomics-fp.ll
    M llvm/test/CodeGen/AMDGPU/global_atomics_scan_fadd.ll
    M llvm/test/CodeGen/AMDGPU/global_atomics_scan_fsub.ll
    M llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
    M llvm/test/CodeGen/AMDGPU/local-atomics-fp.ll

  Log Message:
  -----------
  [AMDGPU] Reorder atomic optimizer to avoid CAS loop.

Expand-Atomic pass emits the CAS loop for FP operations
which limits the optimizations offered by atomic optimizer.

Moving atomic optimizer before expand-atomics allows
better codegen.

Reviewed By: arsenm, #amdgpu

Differential Revision: https://reviews.llvm.org/D157265