mirror of
https://git.postgresql.org/git/postgresql.git
synced 2025-01-12 18:34:36 +08:00
Avoid repeated computation of the constants date2j(1970, 1, 1) and
date2j(2000, 1, 1). Should make for some marginal speed improvement in date/time operations.
This commit is contained in:
Tom Lane
parent
3b4ca4c0d9
commit
d685417fbb
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.79 2003/02/13 17:04:19 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.80 2003/04/04 04:50:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -91,7 +91,7 @@ date_in(PG_FUNCTION_ARGS)
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elog(ERROR, "Unrecognized date external representation '%s'", str);
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}
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date = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1));
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date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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PG_RETURN_DATEADT(date);
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}
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@ -108,7 +108,7 @@ date_out(PG_FUNCTION_ARGS)
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*tm = &tt;
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char buf[MAXDATELEN + 1];
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j2date((date + date2j(2000, 1, 1)),
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j2date(date + POSTGRES_EPOCH_JDATE,
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&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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EncodeDateOnly(tm, DateStyle, buf);
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@ -256,9 +256,10 @@ date_pl_interval(PG_FUNCTION_ARGS)
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if (span->month != 0)
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{
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j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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j2date(dateVal + POSTGRES_EPOCH_JDATE,
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&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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tm->tm_mon += span->month;
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dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
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dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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}
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if (span->time != 0)
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dateVal += (span->time / 86400e0);
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@ -279,9 +280,10 @@ date_mi_interval(PG_FUNCTION_ARGS)
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if (span->month != 0)
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{
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j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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j2date(dateVal + POSTGRES_EPOCH_JDATE,
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&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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tm->tm_mon -= span->month;
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dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
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dateVal = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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}
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if (span->time != 0)
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dateVal -= (span->time / 86400e0);
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@ -346,7 +348,7 @@ date_timestamptz(PG_FUNCTION_ARGS)
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struct tm tt,
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*tm = &tt;
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j2date((dateVal + date2j(2000, 1, 1)),
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j2date(dateVal + POSTGRES_EPOCH_JDATE,
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&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
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if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
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@ -399,7 +401,7 @@ timestamptz_date(PG_FUNCTION_ARGS)
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if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn) != 0)
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elog(ERROR, "Unable to convert timestamp to date");
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result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
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result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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PG_RETURN_DATEADT(result);
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}
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@ -431,7 +433,7 @@ abstime_date(PG_FUNCTION_ARGS)
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default:
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abstime2tm(abstime, &tz, tm, NULL);
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result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
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result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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break;
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.102 2003/02/22 05:57:44 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.103 2003/04/04 04:50:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -648,6 +648,14 @@ j2date(int jd, int *year, int *month, int *day)
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return;
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} /* j2date() */
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/*
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* j2day - convert Julian date to day-of-week (0..6 == Sun..Sat)
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*
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* Note: various places use the locution j2day(date - 1) to produce a
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* result according to the convention 0..6 = Mon..Sun. This is a bit of
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* a crock, but will work as long as the computation here is just a modulo.
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*/
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int
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j2day(int date)
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{
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@ -1261,7 +1269,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
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*dtype = DTK_DATE;
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GetCurrentDateTime(tm);
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j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - 1),
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&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
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&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
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tm->tm_hour = 0;
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tm->tm_min = 0;
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tm->tm_sec = 0;
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@ -1281,7 +1289,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
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*dtype = DTK_DATE;
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GetCurrentDateTime(tm);
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j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1),
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&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
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&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
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tm->tm_hour = 0;
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tm->tm_min = 0;
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tm->tm_sec = 0;
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@ -1546,8 +1554,7 @@ DetermineLocalTimeZone(struct tm * tm)
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delta2;
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time_t mytime;
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day = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) -
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date2j(1970, 1, 1));
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day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
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mysec = tm->tm_sec + (tm->tm_min + (day * 24 + tm->tm_hour) * 60) * 60;
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mytime = (time_t) mysec;
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@ -1556,8 +1563,8 @@ DetermineLocalTimeZone(struct tm * tm)
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* and reassemble to get a representation of local time.
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*/
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tmp = localtime(&mytime);
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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UNIX_EPOCH_JDATE;
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locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
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/*
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@ -1586,8 +1593,8 @@ DetermineLocalTimeZone(struct tm * tm)
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mysec += delta1;
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mytime = (time_t) mysec;
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tmp = localtime(&mytime);
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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UNIX_EPOCH_JDATE;
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locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
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delta2 = mysec - locsec;
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if (delta2 != delta1)
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@ -1595,8 +1602,8 @@ DetermineLocalTimeZone(struct tm * tm)
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mysec += (delta2 - delta1);
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mytime = (time_t) mysec;
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tmp = localtime(&mytime);
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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day = date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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UNIX_EPOCH_JDATE;
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locsec = tmp->tm_sec + (tmp->tm_min + (day * 24 + tmp->tm_hour) * 60) * 60;
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delta2 = mysec - locsec;
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}
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@ -2360,7 +2367,7 @@ DecodeNumber(int flen, char *str, int fmask,
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{
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*tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
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tm->tm_yday = val;
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j2date((date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1),
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j2date(date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1,
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&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
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}
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@ -3702,6 +3709,9 @@ CheckDateTokenTables(void)
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{
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bool ok = true;
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Assert(UNIX_EPOCH_JDATE == date2j(1970, 1, 1));
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Assert(POSTGRES_EPOCH_JDATE == date2j(2000, 1, 1));
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ok &= CheckDateTokenTable("datetktbl", datetktbl, szdatetktbl);
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ok &= CheckDateTokenTable("deltatktbl", deltatktbl, szdeltatktbl);
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ok &= CheckDateTokenTable("australian_datetktbl",
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@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.105 2003/03/20 03:34:56 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.106 2003/04/04 04:50:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -85,10 +85,7 @@ static int istinterval(char *i_string,
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/*
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* GetCurrentAbsoluteTime()
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*
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* Get the current system time. Set timezone parameters if not specified
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* elsewhere. Define HasCTZSet to allow clients to specify the default
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* timezone.
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*
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* Get the current system time (relative to Unix epoch).
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*/
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AbsoluteTime
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GetCurrentAbsoluteTime(void)
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@ -100,11 +97,11 @@ GetCurrentAbsoluteTime(void)
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}
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/* GetCurrentAbsoluteTimeUsec()
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* Get the current system time.
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/*
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* GetCurrentAbsoluteTimeUsec()
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*
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* Returns the number of seconds since epoch (January 1 1970 GMT),
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* and returns fractional seconds (as # of microseconds) into *usec.
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* Get the current system time (relative to Unix epoch), including fractional
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* seconds expressed as microseconds.
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*/
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AbsoluteTime
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GetCurrentAbsoluteTimeUsec(int *usec)
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@ -119,7 +116,31 @@ GetCurrentAbsoluteTimeUsec(int *usec)
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}
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/* GetCurrentDateTime()
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/*
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* AbsoluteTimeUsecToTimestampTz()
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*
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* Convert system time including microseconds to TimestampTz representation.
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*/
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TimestampTz
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AbsoluteTimeUsecToTimestampTz(AbsoluteTime sec, int usec)
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{
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TimestampTz result;
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#ifdef HAVE_INT64_TIMESTAMP
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result = ((sec - ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * 86400))
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* INT64CONST(1000000)) + usec;
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#else
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result = sec - ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * 86400)
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+ (usec / 1000000.0);
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#endif
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return result;
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}
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/*
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* GetCurrentDateTime()
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*
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* Get the transaction start time ("now()") broken down as a struct tm.
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*/
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void
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@ -131,13 +152,10 @@ GetCurrentDateTime(struct tm * tm)
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}
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/*
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* GetCurrentAbsoluteTimeUsec()
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* GetCurrentTimeUsec()
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*
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* Get the current system time. Set timezone parameters if not specified
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* elsewhere. Define HasCTZSet to allow clients to specify the default
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* timezone.
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*
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* Returns the number of seconds since epoch (January 1 1970 GMT)
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* Get the transaction start time ("now()") broken down as a struct tm,
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* including fractional seconds and timezone offset.
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*/
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void
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GetCurrentTimeUsec(struct tm * tm, fsec_t *fsec, int *tzp)
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@ -152,7 +170,7 @@ GetCurrentTimeUsec(struct tm * tm, fsec_t *fsec, int *tzp)
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#ifdef HAVE_INT64_TIMESTAMP
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*fsec = usec;
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#else
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*fsec = usec * 1.0e-6;
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*fsec = usec / 1000000.0;
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#endif
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}
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@ -307,7 +325,7 @@ tm2abstime(struct tm * tm, int tz)
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|| tm->tm_sec < 0 || tm->tm_sec > 59)
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return INVALID_ABSTIME;
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day = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(1970, 1, 1));
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day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
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/* check for time out of range */
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if ((day < MIN_DAYNUM) || (day > MAX_DAYNUM))
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@ -328,18 +328,7 @@ pg_stat_get_backend_activity_start(PG_FUNCTION_ARGS)
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if (sec == 0 && usec == 0)
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PG_RETURN_NULL();
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/*
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* This method of converting "Unix time" (sec/usec since epoch) to a
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* PostgreSQL timestamp is an ugly hack -- if you fix it, be sure to
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* fix the similar hackery in timestamp.c
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*/
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#ifdef HAVE_INT64_TIMESTAMP
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result = (((sec - ((date2j(2000, 1, 1) - date2j(1970, 1, 1)) * 86400))
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* INT64CONST(1000000)) + usec);
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#else
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result = (sec + (usec * 1.0e-6) - ((date2j(2000, 1, 1) -
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date2j(1970, 1, 1)) * 86400));
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#endif
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result = AbsoluteTimeUsecToTimestampTz(sec, usec);
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PG_RETURN_TIMESTAMPTZ(result);
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.81 2003/03/20 06:02:59 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.82 2003/04/04 04:50:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -728,12 +728,7 @@ now(PG_FUNCTION_ARGS)
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sec = GetCurrentTransactionStartTimeUsec(&usec);
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#ifdef HAVE_INT64_TIMESTAMP
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result = (((sec - ((date2j(2000, 1, 1) - date2j(1970, 1, 1)) * 86400))
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* INT64CONST(1000000)) + usec);
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#else
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result = (sec + (usec * 1.0e-6) - ((date2j(2000, 1, 1) - date2j(1970, 1, 1)) * 86400));
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#endif
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result = AbsoluteTimeUsecToTimestampTz(sec, usec);
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PG_RETURN_TIMESTAMPTZ(result);
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}
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@ -800,7 +795,7 @@ timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, fsec_t *fsec, char **tzn)
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struct tm *tx;
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#endif
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date0 = date2j(2000, 1, 1);
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date0 = POSTGRES_EPOCH_JDATE;
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/*
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* If HasCTZSet is true then we have a brute force time zone
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@ -871,9 +866,9 @@ timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, fsec_t *fsec, char **tzn)
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{
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#ifdef HAVE_INT64_TIMESTAMP
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utime = ((dt / INT64CONST(1000000))
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+ ((date0 - date2j(1970, 1, 1)) * INT64CONST(86400)));
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+ ((date0 - UNIX_EPOCH_JDATE) * INT64CONST(86400)));
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#else
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utime = (dt + ((date0 - date2j(1970, 1, 1)) * 86400));
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utime = (dt + ((date0 - UNIX_EPOCH_JDATE) * 86400));
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#endif
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#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
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@ -960,7 +955,7 @@ tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, Timestamp *result)
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if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
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return -1;
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date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
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date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
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time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
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#ifdef HAVE_INT64_TIMESTAMP
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*result = ((date * INT64CONST(86400000000)) + time);
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@ -2675,7 +2670,7 @@ isoweek2date(int woy, int *year, int *mon, int *mday)
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day4 = date2j(*year, 1, 4);
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/* day0 == offset to first day of week (Monday) */
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day0 = (j2day(day4 - 1) % 7);
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day0 = j2day(day4 - 1);
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dayn = ((woy - 1) * 7) + (day4 - day0);
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@ -2701,7 +2696,7 @@ date2isoweek(int year, int mon, int mday)
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day4 = date2j(year, 1, 4);
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/* day0 == offset to first day of week (Monday) */
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day0 = (j2day(day4 - 1) % 7);
|
||||
day0 = j2day(day4 - 1);
|
||||
|
||||
/*
|
||||
* We need the first week containing a Thursday, otherwise this day
|
||||
@ -2709,10 +2704,10 @@ date2isoweek(int year, int mon, int mday)
|
||||
*/
|
||||
if (dayn < (day4 - day0))
|
||||
{
|
||||
day4 = date2j((year - 1), 1, 4);
|
||||
day4 = date2j(year - 1, 1, 4);
|
||||
|
||||
/* day0 == offset to first day of week (Monday) */
|
||||
day0 = (j2day(day4 - 1) % 7);
|
||||
day0 = j2day(day4 - 1);
|
||||
}
|
||||
|
||||
result = (((dayn - (day4 - day0)) / 7) + 1);
|
||||
@ -2723,10 +2718,10 @@ date2isoweek(int year, int mon, int mday)
|
||||
*/
|
||||
if (result >= 53)
|
||||
{
|
||||
day4 = date2j((year + 1), 1, 4);
|
||||
day4 = date2j(year + 1, 1, 4);
|
||||
|
||||
/* day0 == offset to first day of week (Monday) */
|
||||
day0 = (j2day(day4 - 1) % 7);
|
||||
day0 = j2day(day4 - 1);
|
||||
|
||||
if (dayn >= (day4 - day0))
|
||||
result = (((dayn - (day4 - day0)) / 7) + 1);
|
||||
|
||||
@ -9,7 +9,7 @@
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: datetime.h,v 1.36 2003/02/20 05:24:55 tgl Exp $
|
||||
* $Id: datetime.h,v 1.37 2003/04/04 04:50:44 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -259,6 +259,10 @@ extern int day_tab[2][13];
|
||||
|| (((y) == UTIME_MAXYEAR) && (((m) < UTIME_MAXMONTH) \
|
||||
|| (((m) == UTIME_MAXMONTH) && ((d) <= UTIME_MAXDAY))))))
|
||||
|
||||
/* Julian-date equivalents of Day 0 in Unix and Postgres reckoning */
|
||||
#define UNIX_EPOCH_JDATE 2440588 /* == date2j(1970, 1, 1) */
|
||||
#define POSTGRES_EPOCH_JDATE 2451545 /* == date2j(2000, 1, 1) */
|
||||
|
||||
|
||||
extern void GetCurrentDateTime(struct tm * tm);
|
||||
extern void GetCurrentTimeUsec(struct tm * tm, fsec_t *fsec, int *tzp);
|
||||
@ -289,7 +293,7 @@ extern int EncodeInterval(struct tm * tm, fsec_t fsec, int style, char *str);
|
||||
|
||||
extern int DecodeSpecial(int field, char *lowtoken, int *val);
|
||||
extern int DecodeUnits(int field, char *lowtoken, int *val);
|
||||
extern bool ClearDateCache(bool, bool, bool);
|
||||
extern bool ClearDateCache(bool newval, bool doit, bool interactive);
|
||||
|
||||
extern int j2day(int jd);
|
||||
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: nabstime.h,v 1.37 2002/09/01 00:58:07 tgl Exp $
|
||||
* $Id: nabstime.h,v 1.38 2003/04/04 04:50:44 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -157,6 +157,7 @@ extern Datum timeofday(PG_FUNCTION_ARGS);
|
||||
/* non-fmgr-callable support routines */
|
||||
extern AbsoluteTime GetCurrentAbsoluteTime(void);
|
||||
extern AbsoluteTime GetCurrentAbsoluteTimeUsec(int *usec);
|
||||
extern TimestampTz AbsoluteTimeUsecToTimestampTz(AbsoluteTime sec, int usec);
|
||||
extern void abstime2tm(AbsoluteTime time, int *tzp, struct tm * tm, char **tzn);
|
||||
|
||||
#endif /* NABSTIME_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user