[all-commits] [llvm/llvm-project] 61b616: Partially revert "[SchedModels][CortexA55] Add ASI...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 61b616755aced8ed7afc48ffd152f02194b9d201
      https://github.com/llvm/llvm-project/commit/61b616755aced8ed7afc48ffd152f02194b9d201
  Author: David Green <david.green at arm.com>
  Date:   2022-02-28 (Mon, 28 Feb 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64SchedA55.td
    M llvm/test/tools/llvm-mca/AArch64/Cortex/A55-neon-instructions.s

  Log Message:
  -----------
  Partially revert "[SchedModels][CortexA55] Add ASIMD integer instructions"

The Cortex-A55 scheduling model is used for -mcpu=generic, meaning it
can have a wider effect than just the A55. The changes to the A55
scheduling model seems to have caused performance regressions on
Cortex-A510 device which have latencies closer to the original and
different forwarding paths.

This partially reverts the changes from D117003, at least until we can
do something to improve Cortex-A510. According to my results, this
improves the A510 results without altering the A55 very much.