[FFmpeg-devel] Anybody has a Core 2? [PATCH] Small SSSE3 optimization

Zuxy Meng zuxy.meng
Wed May 9 16:37:01 CEST 2007


2007/5/9, Michael Niedermayer <michaelni at gmx.at>:
> Hi
> On Wed, May 09, 2007 at 06:16:36PM +0800, Zuxy Meng wrote:
> > Hi,
> >
> > Cool! Can u do a small unit-test to compare the MMX2 and SSSE3 version
> > of hadamard8_diff? Intel don't give the latency of pabsw in their
> > manuals (while AMD always give ALL instructions' latency & throughput)
> see http://www.agner.org/optimize/instruction_tables.pdf

Thanks! According to this document, pabsw is very fast: the latency is
merely 1 cycle and it has a throughput of 2 per cycle so the SSSE3
version should be considerably faster.
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