[FFmpeg-devel] lavc/aarch64: add simple idct neon functions

[Matthieu Bouron]

On Thu, Feb 23, 2017 at 04:59:16PM +0100, Matthieu Bouron wrote:
> Hello,
> 
> The following patchset add the ff_simple_idct function neon functions for the
> aarch64 platform. It's ported from armv7 simple_idct_neon with some improvements:
>  * the source idct blocks are now loaded once and kept in v24-v31
>  * the source idct blocks are no longer overriden in idct_col4_top
>  * the destination is now written in one pass at the end of
>    ff_simple_idct{,_put,_add}_neon
> 
> It is bitexact with the armv7 neon implementation.
> 
> Here are some results (reported by {START,STOP}_TIMER) on an Odroid-C2 (Cortex
> A53):
> 
> Functions             IDCT: simple       IDCT: simpleneon
> ff_simple_idct_put     9795 units        3170 units
> ff_simple_idct_add    10227 units        3302 units
> 

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