[x264-devel] libx264 for Blackfin?

[Måns Rullgård]

"Georg Lippitsch" <georg.lippitsch at gmx.at> writes:

> Am 10.08.2012, 09:44 Uhr, schrieb Harald Krapfenbauer
> <harald.krapfenbauer at bluetechnix.com>:
>
>> Simultaneous operations on multiple 16-bit values...do you mean this
>> by "dual-issue". I had thought, these vector operations are kind of
>> SIMD...
>
> In addition, the description on the website [1] says:
>
> "..., the Blackfin Processor architecture includes instructions
> specifically defined to enhance performance in video processing
> applications. For example, Discrete Cosine Transform (DCT) is
> supported with an IEEE 1180 rounding operation,

H.264 does not use the IEEE 1180 DCT.

> while the "SUM ABSOLUTE DIFFERENCE" instruction supports motion
> estimation algorithms used in video compression algorithms such as
> MPEG2, MPEG4, and JPEG.",

That one might be somewhat useful.

> which sounds quite useful. But I doubt that any of these instructions
> will currently be used by x264, so you will need to write all these
> optimizations for yourself.

The compiler will certainly not use them on its own.

-- 
Måns Rullgård
mans at mansr.com