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llvm / llvm-project / 218531821a6b6f1132a245a1f52e125610dc7f6a
commit218531821a6b6f1132a245a1f52e125610dc7f6a[log] [tgz]
authorPeter Collingbourne <peter@pcc.me.uk>Wed Apr 16 17:19:50 2025 -0700
committerGitHub <noreply@github.com>Wed Apr 16 17:19:50 2025 -0700
treefb2782ce63c2cd227340c3dcf0517f644e100c83
parenteef978290ccb847c67bf0431e5fdd1dc4c7d408d [diff]
LowerTypeTests: Fix quadratic complexity (try 2).

Currently we have quadratic complexity in LowerTypeTests because
ScopedSaveAliaseesAndUsed loops over all aliases for each disjoint
set, and the number of aliases and number of disjoint sets is
roughly proportional to the program size. Fix that by moving
ScopedSaveAliaseesAndUsed to LowerTypeTestsModule::lower() so that
we do this only once.

Reland of #135875 with fix for bug that caused check-lld test failures.
The fix is to only remove functions from llvm.used/llvm.compiler.used
because buildBitSetsFromGlobalVariables, which now runs while
ScopedSaveAliaseesAndUsed is in scope, will delete global variables,
which would otherwise lead to a use-after-free when they are added
back to llvm.used or llvm.compiler.used.

Reviewers: fmayer, vitalybuka

Reviewed By: fmayer

Pull Request: https://github.com/llvm/llvm-project/pull/136053
1 file changed
tree: fb2782ce63c2cd227340c3dcf0517f644e100c83
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. 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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