Gentoo Archives: gentoo-dev

From: Ryan Hill <deemkay@×××××.com>
To: gentoo-dev@××××××××××××.org
Subject: [gentoo-dev] Re: mmxext flag
Date: Wed, 23 Mar 2005 07:26:21
In Reply to: Re: [gentoo-dev] Re: mmxext flag by Drake Wyrm
1 Drake Wyrm <wyrm <at>> writes:
3 > > MMX2 is supported by Pentium 3 Katmai and Coppermine processors.
4 > > MMXEXT is supported by Athlon processors. As far as I can tell
5 > > they're two very different things. I'm confused.
6 >
7 > You, and a lot of other people.
8 >
9 > Also, I should correct my earlier statement. "MMX2" is _a_ marketing
10 > name for the "Extensions to the MMX Instruction Set", which were
11 > apparently introduced in the AMD-K6-2E+ and AMD-K6-IIIE+. You're right,
12 > though; the Athlon was the first mainline processor with mmx(2|ext).
13 > These extensions were subsequently adopted by Intel into the Pentium II
14 > much in the same way AMD adopted Intel's original MultiMedia eXtensions.
15 >
16 > In my further research on the subject, it looks like Intel has been of
17 > late bragging up it's whiz-bang new "Intel Wireless MMX2 Technology".
18 > It's apparently an instruction set extension targeted at all-in-one
19 > cell-phone-camera-music-player-PDA gadgets. As far as I can tell, it's
20 > the only time Intel has used the term "MMX2".
21 >
22 > Therefore, I recommend the use of "mmxext" to refer to the original
23 > multimedia extensions extensions, to avoid aggravating an
24 > already-confusing situation.
26 thanks, that makes things a little less murky. i see that back in 98-99,
27 everyone was buzzing about the new KNI/MMX2 instruction set, but all references
28 to it seem to have disappeared when it was released. the thing that confuses me
29 most is that MPlayer insists i have MMX2 support. now that its flag has changed
30 to mmxext i find it strange that to enable MMX2 support for an Intel chip, I
31 have to enable support for an Athlon specific technology (at least that's the
32 only references i could find indicate).
34 but this is all semantics anyways. thanks for the prompt reply.
36 --
37 gentoo-dev@g.o mailing list