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llvm / llvm-project / ba4da5a087f28c9522bc7f173e99673bb3009af9
commitba4da5a087f28c9522bc7f173e99673bb3009af9[log] [tgz]
authorMircea Trofin <mtrofin@google.com>Fri Aug 02 20:51:27 2024 -0400
committerGitHub <noreply@github.com>Fri Aug 02 20:51:27 2024 -0400
tree92b87009e6bbe820860cc936e9ffd1cfe284337a
parentac319a8dd8b7999ffa0342e50e02932c5c8f7a6a [diff]
[ctx_prof] "Use" support for pre-thinlink. (#101338)

There is currently no plan to support contextual profiling use in a non-
ThinLTO scenario.

In the pre-link phase, we only instrument and then immediately bail out
to let the linker group functions under an entrypoint in the same module
as the entrypoint. We don't actually care what the profile contains -
just that we want to use a contextual profile.

After that, in post-thinlink, we require the profile be passed again so
we can actually use it. The earlier instrumentation will be used to
match counter values.

While the feature is in development, we add a hidden flag for the use
scenario, but we can eventually tie it to the `PGOOptions` mechanism. We
will use the same flag in both pre- and post-thinlink, because it
simplifies things - usually the post-thinlink args are the same as the
ones for pre-. This, despite the flag being basically treated as a
boolean in pre-thinlink.
2 files changed
tree: 92b87009e6bbe820860cc936e9ffd1cfe284337a
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

Consult the Getting Started with LLVM page for information on building and running LLVM.

For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

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Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.

The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.