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Index > OS Construction > MMX/SSE/SSE2 extensions in a Kernel

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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
Hey, long time no see!

Correct me if I'm wrong on this, but in order to use MMX, you just have to enable the FPU, right?

But what about SSE/SSE2?
Post 14 Mar 2008, 17:11
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
[????]the mmx is available without any else operation than use the registers. as general operations.[/????]

to use fpu, the need to init the environment is a fact.
Post 14 Mar 2008, 17:20
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narada



Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk
narada
Only one "problem" with MMX: after using mmx you mast use command EMMS. Thats all. In other - mmx "is free" ))
Post 14 Mar 2008, 19:15
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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
Cool, thanks.
Post 15 Mar 2008, 03:29
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo
MMX is only available on later model Pentium 1s and newer. It is lower precision than SSE, and it overlays the FPU stack. And you have to reset it (EMMS or FEMMS for AMD) if you want to use the FPU later. However, SSE is more annoying (alignment, ugh) to use, needs specific OS support, and not necessarily faster. Be sure to test for MMX or SSE availability before using it.
Post 17 Mar 2008, 18:26
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