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llvm / llvm-project / 716b02d8c575afde7af1af13df145019659abca2
commit716b02d8c575afde7af1af13df145019659abca2[log] [tgz]
authorDominik Adamski <dominik.adamski@amd.com>Thu Apr 10 12:23:53 2025 +0200
committerGitHub <noreply@github.com>Thu Apr 10 12:23:53 2025 +0200
tree65d7e5d9ed1e44708dd1d50896f1307c921bc611
parent2fe123a1195e16e065f913ba2bba8582370a8707 [diff]
[LLVM][MemCpyOpt] Unify alias tags if we optimize allocas (#129537)

Optimization of alloca instructions may lead to invalid alias tags.
Incorrect alias tags can result in incorrect optimization outcomes for
Fortran source code compiled by Flang with flags: `-O3 -mmlir
-local-alloc-tbaa -flto`.

This commit removes alias tags when memcpy optimization replaces two
arrays with one array, thus ensuring correct compilation of Fortran
source code using flags: `-O3 -mmlir -local-alloc-tbaa -flto`.

This commit is also a proposal to fix the reported issue:
https://github.com/llvm/llvm-project/issues/133984

---------

Co-authored-by: Shilei Tian <i@tianshilei.me>
3 files changed
tree: 65d7e5d9ed1e44708dd1d50896f1307c921bc611
  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-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. 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.

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

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