[all-commits] [llvm/llvm-project] 018d37: [AMDGPU][NFC] Extract the MFMA read-window calcula...

[Michael Halkenhäuser via All-commits]

  Branch: refs/heads/users/mhalk/fix/amdgpu-mfma-hazard-window-pairing
  Home:   https://github.com/llvm/llvm-project
  Commit: 018d3733b477dc27a936073f467d26d7dfeff458
      https://github.com/llvm/llvm-project/commit/018d3733b477dc27a936073f467d26d7dfeff458
  Author: Michael Halkenhaeuser <MichaelGerald.Halkenhauser at amd.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.h

  Log Message:
  -----------
  [AMDGPU][NFC] Extract the MFMA read-window calculation

Move the wait states a consumer needs before reading an MFMA result out
of checkMAIHazards90A into mfmaReadWindow, taking the producer as an
argument, so a caller can ask about a specific producer. The caller
passes the producer the walk recorded, so nothing changes.

AI-assisted.


  Commit: 9f1fce06c508db205c6146e4df66d8d185c0f475
      https://github.com/llvm/llvm-project/commit/9f1fce06c508db205c6146e4df66d8d185c0f475
  Author: Michael Halkenhaeuser <MichaelGerald.Halkenhauser at amd.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp

  Log Message:
  -----------
  [AMDGPU][NFC] Avoid duplicate MAI hazard checks

PreEmitNoopsCommon called checkMAIVALUHazards twice whenever padding was
required.

AI-assisted.


  Commit: 82c8bb5e4011e664ceda215c305efcbde1da0f78
      https://github.com/llvm/llvm-project/commit/82c8bb5e4011e664ceda215c305efcbde1da0f78
  Author: Michael Halkenhaeuser <MichaelGerald.Halkenhauser at amd.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.h
    M llvm/test/CodeGen/AMDGPU/mai-hazards-gfx90a.mir
    M llvm/test/CodeGen/AMDGPU/mai-hazards-gfx942.mir
    M llvm/test/CodeGen/AMDGPU/rewrite-vgpr-mfma-to-agpr.ll

  Log Message:
  -----------
  [AMDGPU] Measure MFMA read hazards at each producer

PLACEHOLDER: first half of the split, message to be written by the maintainer.

AI-assisted.


  Commit: 51c88cca8430769059cb39240a2703dcb774545d
      https://github.com/llvm/llvm-project/commit/51c88cca8430769059cb39240a2703dcb774545d
  Author: Michael Halkenhaeuser <MichaelGerald.Halkenhauser at amd.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/test/CodeGen/AMDGPU/mai-hazards-gfx90a.mir
    M llvm/test/CodeGen/AMDGPU/mai-hazards-gfx942.mir

  Log Message:
  -----------
  [AMDGPU] Measure MFMA overwrite hazards at each instruction

PLACEHOLDER: second half of the split, message to be written by the maintainer.

AI-assisted.


Compare: https://github.com/llvm/llvm-project/compare/018d3733b477%5E...51c88cca8430

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