diff options
Diffstat (limited to 'src/gallium/auxiliary/os')
| -rw-r--r-- | src/gallium/auxiliary/os/os_time.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/os/os_time.c b/src/gallium/auxiliary/os/os_time.c index e169139034c..e4a1cae641a 100644 --- a/src/gallium/auxiliary/os/os_time.c +++ b/src/gallium/auxiliary/os/os_time.c @@ -69,10 +69,17 @@ os_time_get_nano(void) static LARGE_INTEGER frequency; LARGE_INTEGER counter; + int64_t secs, nanosecs; if(!frequency.QuadPart) QueryPerformanceFrequency(&frequency); 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 |