Landing: ea72e6be34c4
Project / Subsystem
gcc / libatomic
Date
2025-02-24
Author
Wilco Dijkstra
Commit
ea72e6be34c41ccf54aab44d17386a4fba74edcd
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- libatomic
- patch_id
- —
- commit_hash
- ea72e6be34c41ccf54aab44d17386a4fba74edcd
- source_type
- github
- headline
- libatomic: Use HWCAPs in AArch64 ifunc tests
- tldr
- Simplifies AArch64 atomic operation selection by using HWCAPs instead of low-level checks.
- author
- Wilco Dijkstra
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libatomic
- • aarch64
- • optimization
- • runtime
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2025-02-24T00:00:00.000Z
The libatomic library on AArch64 now uses hardware capability (HWCAP) flags to select the most efficient atomic operations (ifuncs). This replaces older, more complex checks like has_lse128() and has_rcpc3(), simplifying the code and speeding up runtime selection by avoiding expensive system register accesses.