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Avoid repeated computation of the constants date2j(1970, 1, 1) and

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date2j(2000, 1, 1).  Should make for some marginal speed improvement
in date/time operations.
This commit is contained in:
Tom Lane
2003-04-04 04:50:44 +00:00
parent 3b4ca4c0d9
commit d685417fbb
7 changed files with 91 additions and 72 deletions
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22
src/backend/utils/adt/date.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.79 2003/02/13 17:04:19 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.80 2003/04/04 04:50:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -91,7 +91,7 @@ date_in(PG_FUNCTION_ARGS)
elog(ERROR, "Unrecognized date external representation '%s'", str);
}
date = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1));
date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT(date);
}
@@ -108,7 +108,7 @@ date_out(PG_FUNCTION_ARGS)
*tm = &tt;
char buf[MAXDATELEN + 1];
j2date((date + date2j(2000, 1, 1)),
j2date(date + POSTGRES_EPOCH_JDATE,
&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
EncodeDateOnly(tm, DateStyle, buf);
@@ -256,9 +256,10 @@ date_pl_interval(PG_FUNCTION_ARGS)
if (span->month != 0)
{
j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
j2date(dateVal + POSTGRES_EPOCH_JDATE,
&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
tm->tm_mon += span->month;
dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
}
if (span->time != 0)
dateVal += (span->time / 86400e0);
@@ -279,9 +280,10 @@ date_mi_interval(PG_FUNCTION_ARGS)
if (span->month != 0)
{
j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
j2date(dateVal + POSTGRES_EPOCH_JDATE,
&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
tm->tm_mon -= span->month;
dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
}
if (span->time != 0)
dateVal -= (span->time / 86400e0);
@@ -346,7 +348,7 @@ date_timestamptz(PG_FUNCTION_ARGS)
struct tm tt,
*tm = &tt;
j2date((dateVal + date2j(2000, 1, 1)),
j2date(dateVal + POSTGRES_EPOCH_JDATE,
&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
@@ -399,7 +401,7 @@ timestamptz_date(PG_FUNCTION_ARGS)
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert timestamp to date");
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT(result);
}
@@ -431,7 +433,7 @@ abstime_date(PG_FUNCTION_ARGS)
default:
abstime2tm(abstime, &tz, tm, NULL);
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
break;
}