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llvm / llvm-project / 8476a5d480304bf7bd934c660a159e1c6906a69d
commit8476a5d480304bf7bd934c660a159e1c6906a69d[log] [tgz]
authorMatt Arsenault <Matthew.Arsenault@amd.com>Tue Mar 04 10:04:14 2025 +0700
committerGitHub <noreply@github.com>Tue Mar 04 10:04:14 2025 +0700
treed59402054273ba2599da91acb0ec637a982dc6de
parentce1a18e2c714f39fe72cd46aa04faed29ad23cb6 [diff]
SplitKit: Fix rematerialization undoing subclass based split (#122110)

This fixes an allocation failure in the new test.

In cases where getLargestLegalSuperClass can inflate the register class,
rematerialization could effectively undo a split which was done to
inflate
the register class, if the defining instruction can only write a
subclass
and the use can read the superclass.

Some of the x86 tests changes look like improvements, but some are
likely regressions.

I'm not entirely sure this is the correct place to fix this. It also
seems more complicated than necessary, but the decision to change
the register class is far removed from the point where the decision
to split the virtual register is made. I'm also also not sure if this
should be considering the register classes of all the use indexes
in getUseSlots, rather than just checking if this use index instruction
reads the register.
7 files changed
tree: d59402054273ba2599da91acb0ec637a982dc6de
  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

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