From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Windows warnings from VS 2017 |
Date: | 2017-09-22 01:41:08 |
Message-ID: | 20170922014108.64om7wh3ozfhcczl@alap3.anarazel.de |
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Lists: | pgsql-hackers |
On 2017-09-21 09:30:31 -0400, Tom Lane wrote:
> Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> writes:
> > The speed of memset is hardly going to be the dominating factor in a
> > 'CREATE DATABASE' command, so we could certainly afford to change to
> > plain memset calls here.
>
> Another thought is that it may be time for our decennial debate about
> whether MemSet is worth the electrons it's printed on. I continue to
> think that any modern compiler+libc ought to do an equivalent or better
> optimization given just a plain memset(). If that seems to be true
> for recent MSVC, we could consider putting an #if into c.h to define
> MemSet as just memset for MSVC. Maybe later that could be extended
> to other compilers.
+many. glibc's memset is nearly an order of magnitude faster than MemSet
on my machine for medium+ length copies, and still 3-4 four times ~100
bytes. And both gcc and clang optimize way the memcpy entirely when the
length is a fixed short length.
Greetings,
Andres Freund
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