Gentoo Archives: gentoo-user

From: Jonathan Wright <mail@×××××××××.uk>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] mmx use flag on Pentium 4
Date: Sat, 24 Sep 2005 20:50:11
Message-Id: 4335BAEA.7030200@djnauk.co.uk
In Reply to: [gentoo-user] mmx use flag on Pentium 4 by Robert Persson
1 Robert Persson wrote:
2 > Should I enable the mmx use flag when I am compiling stuff (e.g. mplayer) for
3 > a pentium 4? I'm confused because I've kind of got the idea that mmx is
4 > obsolete, but I'm not clear exactly how obsolete.
5
6 In theory, yes it is sort of obsolete - sse and sse2 are the preferred
7 method. However, so long as you have specified -march=pentium4 (and
8 -mcpu=pentium4 or -mtune=pentium4 with >=gcc-3.4) mmx/sse/sse2 will be
9 implied as part of the compilation process.
10
11 As for mplayer - unless you set the appropriate use flag, then almost
12 all C(XX)FLAGS will be remove from the process as (like gaim) it is
13 notoriously flaky with anything other than the basic settings.
14
15 --
16 Jonathan Wright ~ mail at djnauk.co.uk
17 ~ www.djnauk.co.uk
18 --
19 2.6.12-gentoo-r10-djnauk-b2 Intel(R) Pentium(R) 4 Mobile CPU 1.80GHz
20 up 2 days, 22 min, 3 users, load average: 0.19, 0.21, 0.37
21 --
22 "Bisexuality immediately doubles your chances for a date on
23 Saturday night."
24
25 ~ Woody Allen
26 --
27 gentoo-user@g.o mailing list

Replies

Subject Author
Re: [gentoo-user] mmx use flag on Pentium 4 Walter Dnes <waltdnes@××××××××.org>