[PATCH] D35228: [TableGen] Add support for instruction clusters

[Evandro Menezes via Phabricator via llvm-commits]

evandro created this revision.

This change allows the description of instruction clusters by using the `ReadAdvance` and `SchedReadAdvance` classes.

In a subsequent patch, the instruction scheduler is modified to use this information.

The motivation is to allow a target maintainer to specify which instructions pairs should be clustered together in the machine model.  Thus the clustering is done as part of instruction scheduling instead of relying in a scheduling mutation and adding code to the backend to match the instructions.


Repository:
  rL LLVM

https://reviews.llvm.org/D35228

Files:
  llvm/include/llvm/MC/MCSchedule.h
  llvm/include/llvm/MC/MCSubtargetInfo.h
  llvm/include/llvm/Target/TargetSchedule.td
  llvm/utils/TableGen/SubtargetEmitter.cpp

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