[all-commits] [llvm/llvm-project] 84f7fb: [MachineScheduler] Add option to control reorderin...

[Alex Bradbury via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 84f7fb6217fd417f3b5cb65fe7636e0aab84f6c7
      https://github.com/llvm/llvm-project/commit/84f7fb6217fd417f3b5cb65fe7636e0aab84f6c7
  Author: Alex Bradbury <asb at igalia.com>
  Date:   2024-01-16 (Tue, 16 Jan 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineScheduler.h
    M llvm/lib/CodeGen/MachineScheduler.cpp
    M llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
    M llvm/test/CodeGen/RISCV/misched-load-clustering.ll

  Log Message:
  -----------
  [MachineScheduler] Add option to control reordering for store/load clustering (#75338)

Reordering based on the sort order of the MemOpInfo array was disabled
in <https://reviews.llvm.org/D72706>. However, it's not clear this is
desirable for al targets. It also makes it more difficult to compare the
incremental benefit of enabling load clustering in the selectiondag
scheduler as well was the machinescheduler, as the sdag scheduler does
seem to allow this reordering.

This patch adds a parameter that can control the behaviour on a
per-target basis.

Split out from #73789.