[all-commits] [llvm/llvm-project] 79ab21: [AMDGPU] Model WMMA co-execution windows in the sc...

[Austin Kerbow via All-commits]

  Branch: refs/heads/users/kerbowa/amdgpu-coexec-hazard-mode
  Home:   https://github.com/llvm/llvm-project
  Commit: 79ab217dc4a76871dd0c93bbcb42374140c0e44a
      https://github.com/llvm/llvm-project/commit/79ab217dc4a76871dd0c93bbcb42374140c0e44a
  Author: Austin Kerbow <Austin.Kerbow at amd.com>
  Date:   2026-08-04 (Tue, 04 Aug 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineScheduler.h
    M llvm/lib/CodeGen/MachineScheduler.cpp
    A llvm/lib/Target/AMDGPU/AMDGPUCoExecInfo.h
    M llvm/lib/Target/AMDGPU/AMDGPUCoExecSchedStrategy.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUCoExecSchedStrategy.h
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.h
    M llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.h
    A llvm/test/CodeGen/AMDGPU/coexec-hazardrec-preRA.mir
    M llvm/test/CodeGen/AMDGPU/coexec-scheduler.ll
    M llvm/test/CodeGen/AMDGPU/fdiv.bf16.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.sched.group.barrier.gfx12.ll
    M llvm/test/CodeGen/AMDGPU/misched-into-wmma-hazard-shadow.mir
    A llvm/test/CodeGen/AMDGPU/wmma-trans-multi-shadow-hazard.mir

  Log Message:
  -----------
  [AMDGPU] Model WMMA co-execution windows in the scheduler for gfx1250

WMMA instructions in gfx1250 exposes an execution window during which
only certain other instruction classes may co-execute. Teach the hazard
recognizer about those windows so the scheduler can fill co-execution slots and
account for the resulting stalls. This adds a preRA hazard recognizer
mode.

Add AMDGPUCoExecInfo.h, a shared model of a co-execution window: the
per-stage capability bitmask, the stage types (CoExecStageType), and
CoExecInfo, which maps a multi-cycle instruction to its per-cycle slot
pattern via getCoExecInfo(). InstructionFlavor and its helpers move here
from AMDGPUCoExecSchedStrategy.h with no functional change so they can
be shared by the scheduler and the hazard recognizer.



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