[PATCH] D129594: [InstrProf] Add options to profile function groups

[Ellis Hoag via Phabricator via cfe-commits]

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Add docs


ellis added a comment.

Fix test


Add two options, `-fprofile-function-groups=N` and `-fprofile-selected-function-group=i` used to partition functions into `N` groups and only instrument the functions in group `i`. Similar options were added to xray in https://reviews.llvm.org/D87953 and the goal is the same; to reduce instrumented size overhead by spreading the overhead across multiple builds. Raw profiles from different groups can be added like normal using the `llvm-profdata merge` command.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129594

Files:
  clang/docs/ClangCommandLineReference.rst
  clang/docs/UsersManual.rst
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/CodeGenFunction.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/CodeGen/CodeGenModule.h
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/CodeGen/profile-function-groups.c
  compiler-rt/test/profile/instrprof-groups.c

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