Attachment 133537 Details for Bug 102241 – Improve conversion to nanoseconds in Windows os_time_get_nano()

[patch] Improve conversion to nanoseconds in Windows os_time_get_nano()

0005-Fix-os_time_get_nano-to-roll-over-less.patch (text/plain), 1.13 KB, created by frank.richter on 2017-08-16 08:40:55 UTC

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Creator: frank.richter

Created: 2017-08-16 08:40:55 UTC

Size: 1.13 KB

patch

obsolete

>From d86984a256baab8a3ffc932d26bbe8a8d326d686 Mon Sep 17 00:00:00 2001
>From: Frank Richter <frank.richter@dynardo.de>
>Date: Tue, 15 Aug 2017 15:46:35 +0200
>Subject: [PATCH] Fix os_time_get_nano() to roll over less
>
>---
> src/gallium/auxiliary/os/os_time.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
>diff --git a/src/gallium/auxiliary/os/os_time.c b/src/gallium/auxiliary/os/os_time.c
>index e169139..b02d86a 100644
>--- a/src/gallium/auxiliary/os/os_time.c
>+++ b/src/gallium/auxiliary/os/os_time.c
>@@ -69,10 +69,15 @@ 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
> 
>-- 
>2.11.1.windows.1
>

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