Landing: 9c40d80365f3
Project / Subsystem
gcc / libstdc++
Date
2026-08-30
Author
Anlai Lu
Commit
9c40d80365f334e01f6e864e62ca9965841774cb
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- 9c40d80365f334e01f6e864e62ca9965841774cb
- source_type
- github
- headline
- libstdc++: Skip locale in chrono operator<< for integer seconds precision
- tldr
- Optimizes chrono time_point formatting by skipping locale for integer-second precision, improving performance and reducing complexity.
- author
- Anlai Lu
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • chrono
- • performance
- • locale
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-30T00:00:00.000Z
This commit refactors libstdc++’s chrono time formatting to improve efficiency when dealing with time points that have integer second precision. For such cases, locale-dependent formatting is unnecessary, so the code now conditionally skips the locale argument. This change eliminates a specific locale overload and simplifies initialization, while also including a minor inlining optimization for a helper function.