[all-commits] [llvm/llvm-project] be4614: AMDGPU: Handle V->A MFMA copy from case with immed...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/handle-subreg-def-read-mfma-copy-from-agpr
  Home:   https://github.com/llvm/llvm-project
  Commit: be46142733bec5b9fe7bc13c15542088740443be
      https://github.com/llvm/llvm-project/commit/be46142733bec5b9fe7bc13c15542088740443be
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-08-28 (Thu, 28 Aug 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp
    M llvm/test/CodeGen/AMDGPU/rewrite-vgpr-mfma-to-agpr-copy-from.mir

  Log Message:
  -----------
  AMDGPU: Handle V->A MFMA copy from case with immediate src2

Handle a special case for copies from AGPR VGPR on the MFMA inputs.
If the "input" is really a subregister def, we will not see the
usual copy to VGPR for src2, only the read of the subregister def.
Not sure if this pattern appears in practice.



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