[FFmpeg-devel] [PATCH] VC-1: Faster C loopfilter

[David Conrad]

On Jan 18, 2009, at 12:39 AM, Jason Garrett-Glaser wrote:

> On Sat, Jan 17, 2009 at 11:54 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
>> Yuvi requested I optimize this one, so I did.  This patch can be
>> summed up as follows:
>>
>> 13:20 <@mru> I see a lot of xor
>> 13:20 <@mru> that's usually a sign of magic
>>
>> 338 -> 315 cycles for vc1_loop_filter on Core 2 Duo.
>> Overall decoding 12.047s -> 11.781s
>>
>> Dark Shikari
>>
>
> Also, it seems forcing inlining of vc1_filter_line improves
> performance greatly (315 -> 275 cycles from the above); is it fine to
> av_always_inline it?

I am working on mmx/sse versions you know :P
Anyways you should most of the inlining benefits with separate h/v and  
size=4/8/16 functions (h/v much more so than 4/8/16), e.g. with the  
attached (I'll split/update it once your optimizations hit svn)

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