[PATCH] D44092: [SystemZ] Improve side steering of FPd unit and FXU registers.

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa updated this revision to Diff 319313.
jonpa added a comment.

Latest improvements - still with ongoing experiments.

-Instead of keeping side of the last cycle index of defined GPRs, just remember if the B2BW SU went left or right.

- B2BEdge() looks on the DAG and determines if the two instructions are B2B.

Currently trying two different approaches: "heuristical", or "look-ahead"..."Look-ahead" should hopefully eventually provide a near-optimal result, while maybe the heuristical could get close and simpler...


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D44092/new/

https://reviews.llvm.org/D44092

Files:
  llvm/lib/Target/SystemZ/SystemZHazardRecognizer.cpp
  llvm/lib/Target/SystemZ/SystemZHazardRecognizer.h
  llvm/lib/Target/SystemZ/SystemZMachineScheduler.cpp
  llvm/lib/Target/SystemZ/SystemZMachineScheduler.h
  llvm/lib/Target/SystemZ/SystemZSchedule.td
  llvm/lib/Target/SystemZ/SystemZScheduleZ14.td
  llvm/lib/Target/SystemZ/SystemZScheduleZ15.td
  llvm/test/CodeGen/SystemZ/postra-sched-sidesteer.mir

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