[all-commits] [llvm/llvm-project] f0f96c: [AMDGPU] Preserve scoped-AA metadata when lowering...

[hidekisaito via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f0f96c7f788b90e48a6925437e918c3196913325
      https://github.com/llvm/llvm-project/commit/f0f96c7f788b90e48a6925437e918c3196913325
  Author: hidekisaito <hidekido at amd.com>
  Date:   2026-04-13 (Mon, 13 Apr 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULowerIntrinsics.cpp
    A llvm/test/CodeGen/AMDGPU/lower-intrinsics-noalias-metadata.ll

  Log Message:
  -----------
  [AMDGPU] Preserve scoped-AA metadata when lowering barriers to wave_barrier (#191858)

AMDGPULowerIntrinsics downgrades s_barrier/s_barrier_wait to
wave_barrier on single-wave workgroups, but dropped all metadata from
the original instruction.  The lost !noalias and !alias.scope metadata
prevented MemorySSA's optimized walker from skipping past the barrier,
causing isClobberedInFunction to walk further and reach unrelated
side-effecting defs (e.g. tensor_load_to_lds) that are misclassified
as clobbers — ultimately losing !amdgpu.noclobber on global loads.

Copy !noalias, !alias.scope, and !tbaa from the old instruction to the
replacement wave_barrier.

Made-with: Cursor



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