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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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34
src/backend/utils/adt/datetime.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.102 2003/02/22 05:57:44 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.103 2003/04/04 04:50:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -648,6 +648,14 @@ j2date(int jd, int *year, int *month, int *day)
return;
} /* j2date() */
/*
* j2day - convert Julian date to day-of-week (0..6 == Sun..Sat)
*
* Note: various places use the locution j2day(date - 1) to produce a
* result according to the convention 0..6 = Mon..Sun. This is a bit of
* a crock, but will work as long as the computation here is just a modulo.
*/
int
j2day(int date)
{
@ -1261,7 +1269,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
*dtype = DTK_DATE;
GetCurrentDateTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
@ -1281,7 +1289,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
*dtype = DTK_DATE;
GetCurrentDateTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
@ -1546,8 +1554,7 @@ DetermineLocalTimeZone(struct tm * tm)
delta2;
time_t mytime;
day = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) -
date2j(1970, 1, 1));
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
mysec = tm->tm_sec + (tm->tm_min + (day * 24 + tm->tm_hour) * 60) * 60;
mytime = (time_t) mysec;
@ -1556,8 +1563,8 @@ DetermineLocalTimeZone(struct tm * tm)
* and reassemble to get a representation of local time.
*/
tmp = localtime(&mytime);
day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
date2j(1970, 1, 1));
day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
/*
@ -1586,8 +1593,8 @@ DetermineLocalTimeZone(struct tm * tm)
mysec += delta1;
mytime = (time_t) mysec;
tmp = localtime(&mytime);
day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
date2j(1970, 1, 1));
day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
delta2 = mysec - locsec;
if (delta2 != delta1)
@ -1595,8 +1602,8 @@ DetermineLocalTimeZone(struct tm * tm)
mysec += (delta2 - delta1);
mytime = (time_t) mysec;
tmp = localtime(&mytime);
day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
date2j(1970, 1, 1));
day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
delta2 = mysec - locsec;
}
@ -2360,7 +2367,7 @@ DecodeNumber(int flen, char *str, int fmask,
{
*tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
tm->tm_yday = val;
j2date((date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1),
j2date(date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1,
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
}
@ -3702,6 +3709,9 @@ CheckDateTokenTables(void)
{
bool ok = true;
Assert(UNIX_EPOCH_JDATE == date2j(1970, 1, 1));
Assert(POSTGRES_EPOCH_JDATE == date2j(2000, 1, 1));
ok &= CheckDateTokenTable("datetktbl", datetktbl, szdatetktbl);
ok &= CheckDateTokenTable("deltatktbl", deltatktbl, szdeltatktbl);
ok &= CheckDateTokenTable("australian_datetktbl",