[all-commits] [llvm/llvm-project] 86842e: [AMDGPU] New clang option for emitting a waitcnt i...

[Jun Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 86842e1f724fba5abae50ce438553895e69b8141
      https://github.com/llvm/llvm-project/commit/86842e1f724fba5abae50ce438553895e69b8141
  Author: Jun Wang <jwang86 at yahoo.com>
  Date:   2024-04-10 (Wed, 10 Apr 2024)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/AMDGPU.cpp
    M clang/test/Driver/amdgpu-features.c
    M llvm/lib/Target/AMDGPU/AMDGPU.td
    M llvm/lib/Target/AMDGPU/GCNSubtarget.h
    M llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
    A llvm/test/CodeGen/AMDGPU/insert_waitcnt_for_precise_memory.ll

  Log Message:
  -----------
  [AMDGPU] New clang option for emitting a waitcnt instruction after each memory instruction (#79236)

This patch introduces a new command-line option for clang, namely,
amdgpu-precise-mem-op (or precise-memory in the backend). When this option is specified, a waitcnt
instruction is generated after each memory load/store instruction. The
counter values are always 0, but which counters are involved depends on
the memory instruction.

---------

Co-authored-by: Jun Wang <jun.wang7 at amd.com>



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