[all-commits] [llvm/llvm-project] ca8eef: [CodeGen] Use ProcResGroup information in SchedBou...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ca8eef7e3da8f750d7c7aa004fe426d1d34787ea
      https://github.com/llvm/llvm-project/commit/ca8eef7e3da8f750d7c7aa004fe426d1d34787ea
  Author: David Penry <david.penry at arm.com>
  Date:   2021-04-19 (Mon, 19 Apr 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineScheduler.h
    M llvm/lib/CodeGen/MachineScheduler.cpp
    M llvm/test/CodeGen/ARM/cortex-m7-wideops.mir

  Log Message:
  -----------
  [CodeGen] Use ProcResGroup information in SchedBoundary

When the ProcResGroup has BufferSize=0,

1. if there is a subunit in the list of write resources for the
   scheduling class, do not attempt to schedule the ProcResGroup.
2. if there is not a subunit in the list of write resources for the
   scheduling class, choose a subunit to use instead of the ProcResGroup.
3. having both the ProcResGroup and any of its subunits in the resources
   implied by a InstRW is not supported.

Used to model parallel uses from a pool of resources.

Differential Revision: https://reviews.llvm.org/D98976