[PATCH] D59480: [NFC] Add SchedState to allow forwarding the Scheduling state between MBB

[Qing Shan Zhang via Phabricator via llvm-commits]

steven.zhang created this revision.
steven.zhang added reviewers: MatzeB, hfinkel, javed.absar, fhahn, echristo, atrick.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

This is a NFC patch to improve the Generic scheduler to allow forwarding the scheduling state between MBB. A new class named SchedState is added to keep all the scheduling state that could be forwarded to next MBB.
Later patch would be committed to leverage this to improve the scheduler for some target.

If MBB2 has single pred MBB1, the MBB1's scheduler state could be forwarded to MBB2 to model the scheduler more precise.


https://reviews.llvm.org/D59480

Files:
  llvm/include/llvm/CodeGen/MachineScheduler.h
  llvm/lib/CodeGen/MachineScheduler.cpp

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