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Multimedia instructions

Multimedia instructions

Posted Feb 27, 2009 16:21 UTC (Fri) by vonbrand (guest, #4458)
In reply to: Constant UI responsiveness by nlucas
Parent article: CrunchBang Linux 8.10

The MMX and SSE stuff is about doing the same operation on several data in parallel (but working on small inputs, i.e., integers 8 bits wide). Some RISCy architectures have their own set of "multimedia" instructions.

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Multimedia instructions

Posted Feb 28, 2009 9:29 UTC (Sat) by nlucas (subscriber, #33793) [Link]

Sure, but alpha blending is just that.

By the nature of the RISC architecture, a lot of simple vector operations coded by hand would always outperform the same thing on earlier x86 CPUs, like the first Pentium.

I suppose there are more complex multimedia cases where it makes sense to have dedicated instructions equivalent to SSE on RISC machines.

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