[all-commits] [llvm/llvm-project] f2453a: [AMDGPU] Improve MemorySSA walking in isClobberedI...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f2453af624353273325fe888d794a925ea9fe852
      https://github.com/llvm/llvm-project/commit/f2453af624353273325fe888d794a925ea9fe852
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2026-07-29 (Wed, 29 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUMemoryUtils.cpp
    M llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll
    M llvm/test/CodeGen/AMDGPU/global_smrd_cfg.ll
    M llvm/test/CodeGen/AMDGPU/move-to-valu-addsubu64.ll
    M llvm/test/CodeGen/AMDGPU/noclobber-barrier.ll

  Log Message:
  -----------
  [AMDGPU] Improve MemorySSA walking in isClobberedInFunction (#211817)

Consistently call the two argument overload
`MemorySSAWalker::getClobberingMemoryAccess(MemoryAccess,
MemoryLocation)` to get a clobbering def (according to the AliasAnalysis
used by MSSA) before applying the special cases in `isReallyAClobber`.

This has the effect of marking more loads as `amdgpu-noclobber` and
selecting SMEM load instructions for them.

Fixes: ROCM-28492



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