[FFmpeg-devel] [PATCH] Optimization for add_8x8basis

Zuxy Meng zuxy.meng
Sun May 13 17:51:40 CEST 2007


2007/5/13, Guillaume POIRIER <poirierg at gmail.com>:
> Hi,
> On May 13, 2007, at 3:56 , Zuxy Meng wrote:
> Hi,
> 3DNow! and SSSE3 provide instructions for packed mulplication with
> rounding (pmulhrw and pmulhrsw respectively) which can be used to
> replace pmulhw+paddw+psarw.
> Someone willing to test it on Core 2?
> What kind of sample would be a good test? MPEG-4 ASP, AVC, .... ?

To be honest, I really don't have an exact idea of where it's used:-)
The function add_8x8basis is called in mpegvideo.c, but even fulltest
doesn't cover that particular code path.

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While truth is beauty.
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