[PATCH] D24855: MachineScheduler: Enable macro fusion in post-RA scheduler

[Matthias Braun via llvm-commits]

MatzeB created this revision.
MatzeB added reviewers: atrick, tstellarAMD, jonpa.
MatzeB added a subscriber: llvm-commits.
MatzeB set the repository for this revision to rL LLVM.
Herald added subscribers: wdng, mcrosier, MatzeB.

The post-RA scheduler should respect macro fusion opportunities.

Getting this to actually work in a top-down scheduler:
- When fusing A+B, add all predecessors of B to A as weak edges; That
  way scheduling of A gets delayed until we are in a position where we
  can actually schedule B immediately behind A.
- If B is the bottom schedule boundary mark this in a bit in the
  schedule node instead.

PS: Andrew hinted that he won't do much llvm reviewing; I'd appreciate it if someone else could take a look at this.

Repository:
  rL LLVM

https://reviews.llvm.org/D24855

Files:
  include/llvm/CodeGen/ScheduleDAG.h
  lib/CodeGen/MachineScheduler.cpp
  test/CodeGen/AArch64/postmisched-fusion.mir

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