[all-commits] [llvm/llvm-project] d9b511: [CSSPGO] Set PseudoProbeInserter as a default pass.

[Hongtao Yu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d9b511d8e8c43f79e0e277be287656693dd6563f
      https://github.com/llvm/llvm-project/commit/d9b511d8e8c43f79e0e277be287656693dd6563f
  Author: Hongtao Yu <hoy at fb.com>
  Date:   2021-09-22 (Wed, 22 Sep 2021)

  Changed paths:
    M clang/lib/CodeGen/BackendUtil.cpp
    M lld/ELF/Config.h
    M lld/ELF/Driver.cpp
    M lld/ELF/LTO.cpp
    M lld/ELF/Options.td
    M lld/test/ELF/lto/pseudo-probe-lto.ll
    M llvm/include/llvm/CodeGen/CommandFlags.h
    M llvm/include/llvm/Target/TargetOptions.h
    M llvm/lib/CodeGen/CommandFlags.cpp
    M llvm/lib/CodeGen/PseudoProbeInserter.cpp
    M llvm/lib/CodeGen/TargetPassConfig.cpp
    M llvm/lib/Target/X86/X86TargetMachine.cpp
    M llvm/test/CodeGen/X86/O0-pipeline.ll
    M llvm/test/CodeGen/X86/opt-pipeline.ll
    M llvm/test/Transforms/SampleProfile/pseudo-probe-dangle.ll
    M llvm/test/Transforms/SampleProfile/pseudo-probe-emit-inline.ll
    M llvm/test/Transforms/SampleProfile/pseudo-probe-emit.ll
    M llvm/test/Transforms/SampleProfile/pseudo-probe-instsched.ll
    M llvm/test/tools/llvm-profgen/truncated-pseudoprobe.test

  Log Message:
  -----------
  [CSSPGO] Set PseudoProbeInserter as a default pass.

Currenlty PseudoProbeInserter is a pass conditioned on a target switch. It works well with a single clang invocation. It doesn't work so well when the backend is called separately (i.e, through the linker or llc), where user has always to pass -pseudo-probe-for-profiling explictly. I'm making the pass a default pass that requires no command line arg to trigger, but will be actually run depending on whether the CU comes with `llvm.pseudo_probe_desc` metadata.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D110209