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llvm / llvm-project / 0df1a52852f570fb72c25f88f94f9b51e4689f1d
commit0df1a52852f570fb72c25f88f94f9b51e4689f1d[log] [tgz]
authorAhmed Bougacha <ahmed@bougacha.org>Thu May 08 14:29:24 2025 -0700
committerGitHub <noreply@github.com>Thu May 08 14:29:24 2025 -0700
tree144860f0730abe25cf40eb996718af2f45ab410e
parent03896403d3bf330c8163aa9ae3fe2aa284e273be [diff]
[AArch64][FastISel] Fallback on atomic stlr/cas with non-reg operands. (#133987)

This has been a latent bug for almost 10 years, but is relatively hard
to trigger, needing an address operand that isn't handled by
getRegForValue (in the test here, constexpr casts). When that happens,
it returns 0, which FastISel happily uses as a register operand, all the
way to asm, where we either get a crash on an invalid register, or a
silently corrupt instruction.

Unfortunately, FastISel is still enabled at -O0 for at least
ILP32/arm64_32.
2 files changed
tree: 144860f0730abe25cf40eb996718af2f45ab410e
  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

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.