[all-commits] [llvm/llvm-project] 80b08d: [TableGen] Add support for per-write cycle tunable...

[Ricardo Jesus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 80b08d1bb803a2ee0af7ae5661dc8f2444d97a41
      https://github.com/llvm/llvm-project/commit/80b08d1bb803a2ee0af7ae5661dc8f2444d97a41
  Author: Ricardo Jesus <rjj at nvidia.com>
  Date:   2025-02-17 (Mon, 17 Feb 2025)

  Changed paths:
    M llvm/include/llvm/Target/TargetSchedule.td
    A llvm/test/TableGen/PerWriteCycleCount.td
    M llvm/utils/TableGen/SubtargetEmitter.cpp

  Log Message:
  -----------
  [TableGen] Add support for per-write cycle tunables (#125870)

This patch adds support for describing per-write resource cycle counts
for ReadAdvance records via a new optional field called `tunables`.
    
This makes it possible to declare ReadAdvance records such as:
    
      def : ReadAdvance<Read_C, 1, [Write_A, Write_B], [2]>;
    
The above will effectively declare two entries in the ReadAdvance
table for Read_C, one for Write_A with a cycle count of 1+2, and one for
Write_B with a cycle count of 1+0 (omitted values are assumed 0).
    
The field `tunables` provides a list of deltas relative to the base
`cycle` count of the ReadAdvance. Since the field is optional and
defaults to a list of 0's, this change doesn't affect current targets.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications