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AK: Increase MonotonicTime precision on Windows

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MonotonicTime was using 32 bit floats for operations on the values
converted from an i64 returned by the performance counter. This caused
to either precision losses or complete losses of the data for timing
even things as long as hundreds of miliseconds, which should never be a
problem with the resolution of the performance counter. This change
fixes that behavior.
This commit is contained in:
R-Goc 2025-10-29 00:14:34 +01:00 committed by Andrew Kaster
parent c2ca712406
commit 991ab62dd7
1 changed files with 3 additions and 4 deletions
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7
AK/Time.cpp
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@ -248,17 +248,16 @@ Duration now_time_from_filetime()
Duration now_time_from_query_performance_counter() Duration now_time_from_query_performance_counter()
{ {
static LARGE_INTEGER ticks_per_second; static LARGE_INTEGER ticks_per_second;
// FIXME: Limit to microseconds for now, but could probably use nanos? static f64 ticks_per_nanosecond;
static float ticks_per_microsecond;
if (ticks_per_second.QuadPart == 0) { if (ticks_per_second.QuadPart == 0) {
QueryPerformanceFrequency(&ticks_per_second); QueryPerformanceFrequency(&ticks_per_second);
VERIFY(ticks_per_second.QuadPart != 0); VERIFY(ticks_per_second.QuadPart != 0);
ticks_per_microsecond = static_cast<float>(ticks_per_second.QuadPart) / 1'000'000.0F; ticks_per_nanosecond = static_cast<f64>(ticks_per_second.QuadPart) / 1'000'000'000.0;
} }
LARGE_INTEGER now_time {}; LARGE_INTEGER now_time {};
QueryPerformanceCounter(&now_time); QueryPerformanceCounter(&now_time);
return Duration::from_microseconds(static_cast<i64>(now_time.QuadPart / ticks_per_microsecond)); return Duration::from_nanoseconds(static_cast<i64>(now_time.QuadPart / ticks_per_nanosecond));
} }
Duration now_time_from_clock(int clock_id) Duration now_time_from_clock(int clock_id)