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llvm / llvm-project / df1dd803b6a1b1dd514da5e7c1257c0b75592452
commitdf1dd803b6a1b1dd514da5e7c1257c0b75592452[log] [tgz]
authorJoseph Huber <huberjn@outlook.com>Wed Jul 23 13:19:36 2025 -0500
committerGitHub <noreply@github.com>Wed Jul 23 13:19:36 2025 -0500
treeb74edcfdfccdc95e2755044dab63e0e3e74ab03f
parent6a9817113838a3f87e803ac71aab46b3ccf24686 [diff]
[libc] Cache the most recently used slot for a chunk size (#149751)

Summary:
This patch changes the `find_slab` logic to simply cache the most
successful slot. This means the happy fast path is now a single atomic
load on this index. I removed the SIMT shuffling logic that did slab
lookups wave-parallel. Here I am considering the actual traversal to be
comparatively unlikely, so it's not overly bad that it takes longer.
ideally one thread finds a slot and shared it with the rest so we only
pay that cost once.

---------

Co-authored-by: Shilei Tian <i@tianshilei.me>
1 file changed
tree: b74edcfdfccdc95e2755044dab63e0e3e74ab03f
  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. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-format-ignore
  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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