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Originally Posted by akupenguin
Codecs have nothing to do with floating-point. There aren't any x87 or SSE2 instructions at all in libav's H.264 decoder.
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You're correct. Change x87 to MMX and my post will make a little more sense.
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And, furthermore, only amd64 and P4 have SSE2, and, for most amd64 ( if not all ), SSE2 ops are as slow as their MMX counterparts.
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So you mean they're only fast for the overwhelming majority of machines
I'm still intersted on figures from a newer P4 or A64. While the P3 numbers are relevent, a control would be nice.