[all-commits] [llvm/llvm-project] dc312f: [MISched] Introduce and use ResourceSegments.

[Francesco Petrogalli via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dc312f0331309692e8d6e06e93b3492b6a40989f
      https://github.com/llvm/llvm-project/commit/dc312f0331309692e8d6e06e93b3492b6a40989f
  Author: Francesco Petrogalli <francesco.petrogalli at apple.com>
  Date:   2023-06-09 (Fri, 09 Jun 2023)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineScheduler.h
    M llvm/include/llvm/CodeGen/TargetSchedule.h
    M llvm/include/llvm/MC/MCSchedule.h
    M llvm/include/llvm/Target/TargetSchedule.td
    M llvm/lib/CodeGen/MachineScheduler.cpp
    M llvm/lib/MC/MCSchedule.cpp
    M llvm/unittests/CodeGen/CMakeLists.txt
    A llvm/unittests/CodeGen/SchedBoundary.cpp
    M llvm/utils/TableGen/SubtargetEmitter.cpp

  Log Message:
  -----------
  [MISched] Introduce and use ResourceSegments.

The class `ResourceSegments` is used to keep track of the intervals
that represent resource usage of a list of instructions that are
being scheduled by the machine scheduler.

The collection is made of intervals that are closed on the left and
open on the right (represented by the standard notation `[a, b)`).

These collections of intervals can be extended by `add`ing new
intervals accordingly while scheduling a basic block.

Unit tests are added to verify the possible configurations of
intervals, and the relative possibility of scheduling a new
instruction in these configurations. Specifically, the methods
`getFirstAvailableAtFromBottom` and `getFirstAvailableAtFromTop` are
tested to make sure that both bottom-up and top-down scheduling work
when tracking resource usage across the basic block with
`ResourceSegments`.

Note that the scheduler tracks resource usage with two methods:

1. counters (via `std::vector<unsigned> ReservedCycles;`);

2. intervals (via `std::map<unsigned, ResourceSegments> ReservedResourceSegments;`).

This patch can be considered a NFC test for existing scheduling models
because the tracking system that uses intervals is turned off by
default (field `bit EnableIntervals = false;` in the tablegen class
`SchedMachineModel`).

Reviewed By: andreadb

Differential Revision: https://reviews.llvm.org/D150312