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llvm / scudo / 7112166df1ad68376618f9b7397a9003c6e560ec
commit7112166df1ad68376618f9b7397a9003c6e560ec[log] [tgz]
authorPeter Collingbourne <peter@pcc.me.uk>Thu Apr 22 12:59:57 2021 -0700
committerCopybara-Service <copybara-worker@google.com>Sun May 09 19:09:10 2021 -0700
tree94b14eeacec319fba2d2469792d8691984e727ea
parentfb0a4a8ed3eaf6f702297d378d0b7ff4858ba89a [diff]
scudo: Optimize getSizeLSBByClassId() by compressing the table into an integer if possible. NFCI.

With AndroidSizeClassMap all of the LSBs are in the range 4-6 so we
only need 2 bits of information per size class. Furthermore we have
32 size classes, which conveniently lets us fit all of the information
into a 64-bit integer. Do so if possible so that we can avoid a table
lookup entirely.

Differential Revision: https://reviews.llvm.org/D101105

GitOrigin-RevId: a6500b013a257c969e19ce0d8414ff43fe9bd4fa
1 file changed
tree: 94b14eeacec319fba2d2469792d8691984e727ea
  1. benchmarks/
  2. fuzz/
  3. include/
  4. tests/
  5. tools/
  6. allocator_config.h
  7. atomic_helpers.h
  8. bytemap.h
  9. checksum.cpp
  10. checksum.h
  11. chunk.h
  12. combined.h
  13. common.cpp
  14. common.h
  15. crc32_hw.cpp
  16. flags.cpp
  17. flags.h
  18. flags.inc
  19. flags_parser.cpp
  20. flags_parser.h
  21. fuchsia.cpp
  22. fuchsia.h
  23. internal_defs.h
  24. LICENSE.TXT
  25. linux.cpp
  26. linux.h
  27. list.h
  28. local_cache.h
  29. memtag.h
  30. mutex.h
  31. options.h
  32. platform.h
  33. primary32.h
  34. primary64.h
  35. quarantine.h
  36. release.cpp
  37. release.h
  38. report.cpp
  39. report.h
  40. secondary.h
  41. size_class_map.h
  42. stack_depot.h
  43. stats.h
  44. string_utils.cpp
  45. string_utils.h
  46. tsd.h
  47. tsd_exclusive.h
  48. tsd_shared.h
  49. vector.h
  50. wrappers_c.cpp
  51. wrappers_c.h
  52. wrappers_c.inc
  53. wrappers_c_bionic.cpp
  54. wrappers_c_checks.h
  55. wrappers_cpp.cpp