[FFmpeg-devel] [PATCH] Add filter_limit to VP3 loop filter paramaters

Michael Niedermayer michaelni
Sat Oct 4 16:03:43 CEST 2008

On Sat, Oct 04, 2008 at 12:17:03AM -0400, David Conrad wrote:
> Hi,
> The C implementation of the VP3 loop filter uses a table of pre-calculated 
> values for the filter function. This doesn't work so well in SIMD; it's 
> faster to calculate the function with the limit value.
> Implementing the C version without the table is slightly faster on my 
> Penryn, but about 20% slower on P4, so it's probably not worth it to 
> replace the C version to get rid of the table completely.

> commit d9c9dc44f45e4fcc9628cca77bcdb8f689641cb7
> Author: David Conrad <davedc at wireless-218-141.wireless.umbc.edu>
> Date:   Tue Sep 30 18:44:37 2008 -0400
>     Change vp3 filter arguments to take the filter limit value as well, which is more useful for simd than a table

patch looks ok

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When you are offended at any man's fault, turn to yourself and study your
own failings. Then you will forget your anger. -- Epictetus
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