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Old 3rd April 2013, 04:48   #11  |  Link
Dark Shikari
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Join Date: Sep 2005
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Quote:
Originally Posted by foxyshadis View Post
It's actually a reasonably fast range coder, and keeps separate state in both threads; most of the time seems to be spent in prediction, which is already SIMD'd to hell and back.
That seems kind of hard to believe -- median prediction only takes a few SIMD operations per 16 pixels, while even a highly optimized arithmetic coder like x264's takes a dozen or two cycles per output bit. Is something else odd going on here?
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