[all-commits] [llvm/llvm-project] bbf69d: [AMDGPU] Add structural stall heuristic to schedul...

[Austin Kerbow via All-commits]

  Branch: refs/heads/users/kerbowa/structural-vs-latency-stall-heuristic
  Home:   https://github.com/llvm/llvm-project
  Commit: bbf69d1b280b197c3f0a6e0fc9edf91f361ec407
      https://github.com/llvm/llvm-project/commit/bbf69d1b280b197c3f0a6e0fc9edf91f361ec407
  Author: Austin Kerbow <Austin.Kerbow at amd.com>
  Date:   2025-11-25 (Tue, 25 Nov 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUMLSchedStrategy.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUMLSchedStrategy.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/GCNSchedStrategy.h
    M llvm/test/CodeGen/AMDGPU/ml-sched-effective-stall.mir

  Log Message:
  -----------
  [AMDGPU] Add structural stall heuristic to scheduling strategies

Implements a structural stall heuristic that considers both resource
hazards and latency constraints when selecting instructions from the
pending queue.

- Add getStructuralStallCycles() to GCNSchedStrategy that computes the
number of cycles an instruction must wait due to:
  - Resource conflicts on unbuffered resources (from the SchedModel)
  - Sequence-dependent hazards (from GCNHazardRecognizer)

- Add getHazardWaitStates() to GCNHazardRecognizer that returns the number
of wait states until all hazards for an instruction are resolved,
providing cycle-accurate hazard information for scheduling heuristics.



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