Gentoo Archives: gentoo-dev

From: Paul de Vrieze <pauldv@g.o>
To: gentoo-dev@g.o
Subject: Re: [gentoo-dev] The SIMD debacle
Date: Tue, 30 Sep 2003 12:57:43
Message-Id: 200309301457.10626.pauldv@gentoo.org
In Reply to: [gentoo-dev] The SIMD debacle by Jon Ellis
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4 On Tuesday 30 September 2003 14:46, Jon Ellis wrote:
5 > Can someone explain the sse / 3dnow! situation to me?
6 >
7 > My understanding is that most modern intel and amd chips supprt sse,
8 > but only amd support 3dnow! Is this correct? Why would someone with a
9 > pentium 4 box have 3dnow in their use flags?
10 >
11
12 I think you are completely right, 3dnow in the useflags should be only done on
13 amd systems that have 3dnow.
14
15 > Does anyone point me a ebuilds that correctly handle this stuff? It
16 > would be most useful to understand how protect users from themselves
17 > and reduce the number 'invalid instruction' bugs filed against
18 > libvorbis!
19
20 I think you might want to put in a check to test for actual 3dnow support.
21 However it is perfectly legal to build a package on a p4 that is going to run
22 on an athlon, so disabling the useflag might limit the users.
23
24 Paul
25
26 - --
27 Paul de Vrieze
28 Gentoo Developer
29 Mail: pauldv@g.o
30 Homepage: http://www.devrieze.net
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