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tvdiff_secs(): sub-zero time difference adjustment

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Skip a floating point addition operation when integral part of time difference
is zero. This avoids potential floating point addition rounding problems while
preserving decimal part value.
This commit is contained in:
Yang Tse
2011-11-25 13:51:55 +01:00
parent 4a4d04446d
commit 97d7a9260e
3 changed files with 15 additions and 6 deletions
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7
src/tool_util.c
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@@ -123,8 +123,11 @@ long tool_tvdiff(struct timeval newer, struct timeval older)
*/
double tool_tvdiff_secs(struct timeval newer, struct timeval older)
{
return (double)(newer.tv_sec-older.tv_sec)+
(double)(newer.tv_usec-older.tv_usec)/1000000.0;
if(newer.tv_sec != older.tv_sec)
return (double)(newer.tv_sec-older.tv_sec)+
(double)(newer.tv_usec-older.tv_usec)/1000000.0;
else
return (double)(newer.tv_usec-older.tv_usec)/1000000.0;
}
/* return the number of seconds in the given input timeval struct */