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gallium/os: fix os_time_get_nano() to roll over less

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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102241
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
(cherry picked from commit 7fb7287ce7)
This commit is contained in:
Frank Richter 2017-08-15 15:46:35 +02:00 • committed by Emil Velikov
parent e452ed26ff
commit 42e8f3ccdf
1 changed files with 8 additions and 1 deletions
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9
src/gallium/auxiliary/os/os_time.c
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@ -69,10 +69,17 @@ os_time_get_nano(void)
static LARGE_INTEGER frequency; static LARGE_INTEGER frequency;
LARGE_INTEGER counter; LARGE_INTEGER counter;
int64_t secs, nanosecs;
if(!frequency.QuadPart) if(!frequency.QuadPart)
QueryPerformanceFrequency(&frequency); QueryPerformanceFrequency(&frequency);
QueryPerformanceCounter(&counter); QueryPerformanceCounter(&counter);
return counter.QuadPart*INT64_C(1000000000)/frequency.QuadPart; /* Compute seconds and nanoseconds parts separately to
* reduce severity of precision loss.
*/
secs = counter.QuadPart / frequency.QuadPart;
nanosecs = (counter.QuadPart % frequency.QuadPart) * INT64_C(1000000000)
/ frequency.QuadPart;
return secs*INT64_C(1000000000) + nanosecs;
#else #else