Re: Performance improvements for src/port/snprintf.c

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>

To: Andres Freund <andres@anarazel.de>

Cc: Alexander Kuzmenkov <a.kuzmenkov@postgrespro.ru>, pgsql-hackers@lists.postgresql.org

Date: 2018-09-27T01:30:25Z

Lists: pgsql-hackers

Attachments

snprintf-speedups-4.patch (text/x-diff) patch

Here's a rebased version of <15785.1536776055@sss.pgh.pa.us>.

I think we should try to get this reviewed and committed before
we worry more about the float business.  It would be silly to
not be benchmarking any bigger changes against the low-hanging
fruit here.

			regards, tom lane

Commits

Improve snprintf.c's handling of NaN, Infinity, and minus zero.
- 6eb3eb577d76 12.0 landed
Rationalize snprintf.c's handling of "ll" formats.
- 595a0eab7f42 12.0 landed
Provide fast path in snprintf.c for conversion specs that are just "%s".
- 6d842be6c118 12.0 landed
Make assorted performance improvements in snprintf.c.
- abd9ca377d66 12.0 landed
Set snprintf.c's maximum number of NL arguments to be 31.
- 625b38ea0e98 12.0 cited
Always use our own versions of *printf().
- 96bf88d52711 12.0 cited