Google Git
Sign in
llvm / llvm-project / 8cc83b66e20e72cdb3bb5fbd549c941797b0e0c9
commit8cc83b66e20e72cdb3bb5fbd549c941797b0e0c9[log] [tgz]
authorAiden Grossman <aidengrossman@google.com>Mon Jan 27 15:23:37 2025 -0800
committerGitHub <noreply@github.com>Mon Jan 27 15:23:37 2025 -0800
treebc21e9a019bea87e194e701d1c5026d5ed502f6a
parent7fd58339b4c783f240904aa5c1007e017378ada1 [diff]
[MLGO] Count LR Evictions Rather than Relying on Cascade (#124440)

This patch adjusts the mlregalloc-max-cascade flag (renaming it to
mlregalloc-max-eviction-count) to actually count evictions rather than
just looking at the cascade number. The cascade number is not very
representative of how many times a LR has been evicted, which can lead
to some problems in certain cases, where we might end up with many
eviction problems where we have now masked off all the interferences and
are forced to evict the candidate.

This is probably what I should've done in the first place. No test case
as this only shows up in quite large functions post ThinLTO and it would
be hard to construct something that would serve as a nice regression
test without being super brittle. I've tested this on the pathological
cases that we have come across so far and it works.

Fixes #122829
1 file changed
tree: bc21e9a019bea87e194e701d1c5026d5ed502f6a
  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

OpenSSF Scorecard OpenSSF Best Practices libc++

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.

Getting in touch

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.