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llvm / llvm-project / f8de1618cc3349829ed5ab699413dcb84451e0c7
commitf8de1618cc3349829ed5ab699413dcb84451e0c7[log] [tgz]
authorOrlando Cazalet-Hyams <orlando.hyams@sony.com>Tue May 06 15:03:20 2025 +0100
committerGitHub <noreply@github.com>Tue May 06 15:03:20 2025 +0100
treeef571b0cbd097f457615b98032bd182cee9b9579
parentaec39293316049e5944ac281f800efe5e0dcac5f [diff]
[KeyInstr][SimplifyCFG] Remap atoms when folding br to common succ into pred (#133482)

SimplifyCFG folds `d` into preds `b` and `c`.

              +---------------+
              |               |
         +--> b --+           |
         |        v           v
     --> a        d --> e --> f -->
         |        ^           ^
         +--> c --+           |
              |               |
              +---------------+
    
Remap source atoms so that the duplicated instructions are analysed
independently to determine is_stmt positions.

The pull request contains a discussion covering various edge cases here:
https://github.com/llvm/llvm-project/pull/133482/files#r2039519348

The summary of the discussion is that we could avoid remapping when there's a
single pred, but we decided that it's still a trade off, and not worth the
additional complexity right now.

RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
3 files changed
tree: ef571b0cbd097f457615b98032bd182cee9b9579
  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
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