[all-commits] [llvm/llvm-project] 03677f: [MachineScheduler] Optional scheduling of single-M...

[Lucas Ramirez via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 03677f63a7d3f8bfd50407b5fa2a86f8fbcc162f
      https://github.com/llvm/llvm-project/commit/03677f63a7d3f8bfd50407b5fa2a86f8fbcc162f
  Author: Lucas Ramirez <11032120+lucas-rami at users.noreply.github.com>
  Date:   2025-03-04 (Tue, 04 Mar 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
    M llvm/lib/CodeGen/MachineScheduler.cpp
    M llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
    M llvm/test/CodeGen/ARM/misched-branch-targets.mir
    M llvm/test/CodeGen/X86/fake-use-scheduler.mir

  Log Message:
  -----------
  [MachineScheduler] Optional scheduling of single-MI regions (#129704)

Following 15e295d the machine scheduler no longer filters-out single-MI
regions when emitting regions to schedule. While this has no functional
impact at the moment, it generally has a negative compile-time impact
(see #128739).

Since all targets but AMDGPU do not care for this behavior, this
introduces an off-by-default flag to `ScheduleDAGInstrs` to control
whether such regions are going to be scheduled, effectively reverting
15e295d for all targets but AMDGPU (currently the only target enabling
this flag).



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