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llvm / llvm-project / ba84cfbe0ce2c697702c377b32e4dbf50dd1e114
commitba84cfbe0ce2c697702c377b32e4dbf50dd1e114[log] [tgz]
authorHari Limaye <hari.limaye@arm.com>Tue Aug 20 11:00:03 2024 +0100
committerGitHub <noreply@github.com>Tue Aug 20 11:00:03 2024 +0100
treefa4f4715b9e6765ea385f58ff2cdef3f7c230c1c
parentb432afc28406b670a58933c2fe56c73e6f85911e [diff]
[BasicAA] Use nuw attribute of GEPs (#98608)

Use the nuw attribute of GEPs to prove that pointers do not alias, in
cases matching the following:

   +                +                     +
   | BaseOffset     |   +<nuw> Indices    |
   ---------------->|-------------------->|
   |-->V2Size       |                     |-------> V1Size
  LHS                                    RHS

If the difference between pointers is Offset +<nuw> Indices then we know
that the addition does not wrap the pointer index type (add nuw) and the
constant Offset is a lower bound on the distance between the pointers. We
can then prove NoAlias via Offset u>= V2Size.
2 files changed
tree: fa4f4715b9e6765ea385f58ff2cdef3f7c230c1c
  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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