From: Frank Richter <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102241
Cc: [email protected]
Reviewed-by: Brian Paul <[email protected]>
---
src/gallium/auxiliary/os/os_time.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/gallium/auxiliary/os/os_time.c
b/src/gallium/auxiliary/os/os_time.c
index e169139..e4a1cae 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
--
1.9.1
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