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Nothing has been moved

Posted Nov 2, 2012 17:24 UTC (Fri) by nix (subscriber, #2304)
In reply to: Nothing has been moved by Arker
Parent article: Airlie: raspberry pi drivers are NOT useful

Er, *none* of the video playback and decoding engines are written in 'ultra-high languages': the inner loops of most of them are handcrafted assembler. None of them are 'essentially unoptimized'. The pixel display routines in X are also, these days, mostly done by pixman and to a considerable degree done in handcrafted assembler, taking advantage of SSE and the like.

I note that your 386 almost certainly did not have to decompress compressed video and blit it at the same time as everything else.


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Nothing has been moved

Posted Nov 2, 2012 23:50 UTC (Fri) by Arker (guest, #14205) [Link]

I didnt say the codecs are written in ultra-high level languages, although I wouldnt be shocked if you found an instance of it particularly on a less common architecture like ARM. But what I did say was that the rest of the system is often written so. And regardless of how good your codec is, it is still running inside of a much larger, looser system which has very significant performance costs.


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