| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andreas Karlsson <andreas(at)proxel(dot)se>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Using 128-bit integers for sum, avg and statistics aggregates |
| Date: | 2015-03-18 23:07:40 |
| Message-ID: | 20150318230740.GC26995@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2015-03-18 15:59:52 -0700, Peter Geoghegan wrote:
> Okay. Attached revision has a few tweaks that reflect the status of
> int128/uint128 as specialized types that are basically only useful for
> this optimization, or other similar optimizations on compilers that
> either are GCC, or aim to be compatible with it. I don't think
> Andreas' V9 reflected that sufficiently.
Given that we don't rely on C99, I don't think that actually
matters. Lots of our platforms build on pre C99 compilers... I think it
makes sense to say that this currently only tests for a gcc extension
and might be extended in the future. But nothing more.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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