[Git][wine/wine][master] ntdll: Avoid expensive inverted DST check on get_timezone_info() cache hit path.

[Alexandre Julliard (＠julliard)]

Alexandre Julliard pushed to branch master at wine / wine


Commits:
e3394292 by Zhou Qiankang at 2026-03-16T23:08:24+01:00
ntdll: Avoid expensive inverted DST check on get_timezone_info() cache hit path.

inverted DST detection (two mktime() calls) out of the cache hit fast path in
get_timezone_info().

Keep the cache key based on the cheap raw bias value and only compute
inverted_dst/adjusted_bias on cache miss. Preserve the inverse DST correctness
fix by still applying adjusted_bias to tzi->Bias in the slow path.

This restores fast-path behavior for frequent GetTimeZoneInformation
callers without regressing inverse DST handling.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59514
Signed-off-by: Zhou Qiankang <[e-mail]>

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1 changed file:

- dlls/ntdll/unix/system.c


View it on GitLab: https://gitlab.winehq.org/wine/wine/-/commit/e3394292156b8f162ae120a1d0172a7...

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View it on GitLab: https://gitlab.winehq.org/wine/wine/-/commit/e3394292156b8f162ae120a1d0172a7...
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