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llvm / llvm-project / 6ef829941b38f7e8a28c4cba1ff25cd0ae9f7d3d
commit6ef829941b38f7e8a28c4cba1ff25cd0ae9f7d3d[log] [tgz]
authorFlorian Hahn <flo@fhahn.com>Wed Mar 27 19:11:17 2024 +0000
committerFlorian Hahn <flo@fhahn.com>Wed Mar 27 19:11:18 2024 +0000
treeabd14f98d6e27286e8322e5b44e2a1f9093adeb0
parented68aac9f225ce560a89315c30f1e97e7e035a03 [diff]
Recommit "[VPlan] Replace disjoint or with add instead of dropping disjoint. (#83821)"

Recommit with a fix for the use-after-free causing the revert.
This reverts the revert commit f872043e055f4163c3c4b1b86ca0354490174987.

Original commit message:

Dropping disjoint from an OR may yield incorrect results, as some
analysis may have converted it to an Add implicitly (e.g. SCEV used for
dependence analysis). Instead, replace it with an equivalent Add.

This is possible as all users of the disjoint OR only access lanes where
the operands are disjoint or poison otherwise.

Note that replacing all disjoint ORs with ADDs instead of dropping the
flags is not strictly necessary. It is only needed for disjoint ORs that
SCEV treated as ADDs, but those are not tracked.

There are other places that may drop poison-generating flags; those
likely need similar treatment.

Fixes https://github.com/llvm/llvm-project/issues/81872

PR: https://github.com/llvm/llvm-project/pull/83821
5 files changed
tree: abd14f98d6e27286e8322e5b44e2a1f9093adeb0
  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. openmp/
  21. polly/
  22. pstl/
  23. runtimes/
  24. third-party/
  25. utils/
  26. .clang-format
  27. .clang-tidy
  28. .git-blame-ignore-revs
  29. .gitattributes
  30. .gitignore
  31. .mailmap
  32. CODE_OF_CONDUCT.md
  33. CONTRIBUTING.md
  34. LICENSE.TXT
  35. pyproject.toml
  36. README.md
  37. SECURITY.md
README.md

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