[all-commits] [llvm/llvm-project] 5b461d: [FS-AFDO] Assign discriminators to pseudo probes

[Hongtao Yu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5b461d5ec172d21029da492064704fe3da6f8bab
      https://github.com/llvm/llvm-project/commit/5b461d5ec172d21029da492064704fe3da6f8bab
  Author: Hongtao Yu <hoy at fb.com>
  Date:   2023-04-04 (Tue, 04 Apr 2023)

  Changed paths:
    M llvm/lib/CodeGen/MIRFSDiscriminator.cpp
    A llvm/test/CodeGen/X86/fsafdo_probe.ll

  Log Message:
  -----------
  [FS-AFDO] Assign discriminators to pseudo probes

This is the first change for FS-AFDO integration with CSSPGO. There are more patches coming.

With pseudo probes, we do not assign FS discriminators to any other instructions since we will be using only probes for profile correlation.

Also call instructions are excluded since their dwarf discriminators are used for other purposes, i.e, storing probe ids. Since they are not getting a FS discriminator, they will also be excluded from MIR profile loading. The corresponding changes will be in the subsequent patches.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D147286