[all-commits] [llvm/llvm-project] 5e007a: [AMDGPU] Handle hazard in v_scalef32_sr_fp4_* conv...

[Pravin Jagtap via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5e007afa9d4f175decc328ee89533a5fe89be99b
      https://github.com/llvm/llvm-project/commit/5e007afa9d4f175decc328ee89533a5fe89be99b
  Author: Pravin Jagtap <Pravin.Jagtap at amd.com>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.td
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
    M llvm/lib/Target/AMDGPU/VOP3Instructions.td
    M llvm/lib/Target/AMDGPU/VOPInstructions.td
    M llvm/test/CodeGen/AMDGPU/hazards-gfx950.mir

  Log Message:
  -----------
  [AMDGPU] Handle hazard in v_scalef32_sr_fp4_* conversions (#118589)

Presently, compiler selectivelly adds nop when opsel != 0 i.e. only when
partially writing to high bytes.
Experiments in SWDEV-499733 and SWDEV-501347 suggest that we need nop
for above cases irrespective of opsel values.

Note: We might need to add few others into the same table.



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