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Optimizations for integer to decimal output.

Browse Source 
Using a lookup table of digit pairs reduces the number of divisions
needed, and calculating the length upfront saves some work; these
ideas are taken from the code previously committed for floats.

David Fetter, reviewed by Kyotaro Horiguchi, Tels, and me.

Discussion: https://postgr.es/m/20190924052620.GP31596%40fetter.org
This commit is contained in:
Andrew Gierth
2020-02-01 21:57:14 +00:00
parent 7bae0ad9fc
commit 1fd687a035
5 changed files with 300 additions and 240 deletions
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98
src/backend/utils/adt/datetime.c
View File

@ -388,9 +388,9 @@ AppendSeconds(char *cp, int sec, fsec_t fsec, int precision, bool fillzeros)
Assert(precision >= 0);
if (fillzeros)
cp = pg_ltostr_zeropad(cp, Abs(sec), 2);
cp = pg_ultostr_zeropad(cp, Abs(sec), 2);
else
cp = pg_ltostr(cp, Abs(sec));
cp = pg_ultostr(cp, Abs(sec));
/* fsec_t is just an int32 */
if (fsec != 0)
@ -430,7 +430,7 @@ AppendSeconds(char *cp, int sec, fsec_t fsec, int precision, bool fillzeros)
* which will generate a correct answer in the minimum valid width.
*/
if (value)
return pg_ltostr(cp, Abs(fsec));
return pg_ultostr(cp, Abs(fsec));
return end;
}
@ -3831,20 +3831,20 @@ EncodeTimezone(char *str, int tz, int style)
if (sec != 0)
{
str = pg_ltostr_zeropad(str, hour, 2);
str = pg_ultostr_zeropad(str, hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, min, 2);
str = pg_ultostr_zeropad(str, min, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, sec, 2);
str = pg_ultostr_zeropad(str, sec, 2);
}
else if (min != 0 || style == USE_XSD_DATES)
{
str = pg_ltostr_zeropad(str, hour, 2);
str = pg_ultostr_zeropad(str, hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, min, 2);
str = pg_ultostr_zeropad(str, min, 2);
}
else
str = pg_ltostr_zeropad(str, hour, 2);
str = pg_ultostr_zeropad(str, hour, 2);
return str;
}
@ -3861,40 +3861,40 @@ EncodeDateOnly(struct pg_tm *tm, int style, char *str)
case USE_ISO_DATES:
case USE_XSD_DATES:
/* compatible with ISO date formats */
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
break;
case USE_SQL_DATES:
/* compatible with Oracle/Ingres date formats */
if (DateOrder == DATEORDER_DMY)
{
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '/';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
}
else
{
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '/';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '/';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
case USE_GERMAN_DATES:
/* German-style date format */
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '.';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '.';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
@ -3903,18 +3903,18 @@ EncodeDateOnly(struct pg_tm *tm, int style, char *str)
/* traditional date-only style for Postgres */
if (DateOrder == DATEORDER_DMY)
{
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
}
else
{
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '-';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
}
@ -3939,9 +3939,9 @@ EncodeDateOnly(struct pg_tm *tm, int style, char *str)
void
EncodeTimeOnly(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, int style, char *str)
{
str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, tm->tm_min, 2);
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendSeconds(str, tm->tm_sec, fsec, MAX_TIME_PRECISION, true);
if (print_tz)
@ -3984,16 +3984,16 @@ EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char
case USE_ISO_DATES:
case USE_XSD_DATES:
/* Compatible with ISO-8601 date formats */
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = (style == USE_ISO_DATES) ? ' ' : 'T';
str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, tm->tm_min, 2);
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
if (print_tz)
@ -4004,23 +4004,23 @@ EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char
/* Compatible with Oracle/Ingres date formats */
if (DateOrder == DATEORDER_DMY)
{
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '/';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
}
else
{
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '/';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '/';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = ' ';
str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, tm->tm_min, 2);
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
@ -4043,16 +4043,16 @@ EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char
case USE_GERMAN_DATES:
/* German variant on European style */
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '.';
str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '.';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = ' ';
str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, tm->tm_min, 2);
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
@ -4078,7 +4078,7 @@ EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char
*str++ = ' ';
if (DateOrder == DATEORDER_DMY)
{
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = ' ';
memcpy(str, months[tm->tm_mon - 1], 3);
str += 3;
@ -4088,16 +4088,16 @@ EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char
memcpy(str, months[tm->tm_mon - 1], 3);
str += 3;
*str++ = ' ';
str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = ' ';
str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ltostr_zeropad(str, tm->tm_min, 2);
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
*str++ = ' ';
str = pg_ltostr_zeropad(str,
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
if (print_tz)