[FFmpeg-devel] [PATCH] VP8 MMX optimizations (MC and IDCT dc_add)

[Jason Garrett-Glaser]

On Tue, Jun 22, 2010 at 8:22 PM, Jason Garrett-Glaser
<darkshikari at gmail.com> wrote:
> On Tue, Jun 22, 2010 at 6:50 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
>> On Tue, Jun 22, 2010 at 4:31 PM, Jason Garrett-Glaser
>> <darkshikari at gmail.com> wrote:
>>> On Tue, Jun 22, 2010 at 4:05 PM, Jason Garrett-Glaser
>>> <darkshikari at gmail.com> wrote:
>>>> On Tue, Jun 22, 2010 at 12:35 PM, Ronald S. Bultje <rsbultje at gmail.com> wrote:
>>>>> Hi,
>>>>>
>>>>> as per $subj.
>>>>>
>>>>> Speed gain:
>>>>> - dc_add goes from 1800 to 1350 cycles (where 1150 is overhead,
>>>>> measured as empty asm func), so about 3-3.5x faster.
>>>>> - The MC functions are each about 4-5x faster (I only measured the 4x4
>>>>> ones, the rest I assume are similarly faster but not measured).
>>>>> - Total time spent on a shell-script that decodes the whole testsuite
>>>>> (vp8-test-vectors-r1, file 001-017) including shell overhead and
>>>>> everything goers from 2.3 to 2.1 seconds with these applied.
>>>>>
>>>>> Results are bit-identical, and this is my first MMX/etc. ever! Thanks
>>>>> to Jason for teaching me. ;-).
>>>>>
>>>>> Ronald
>>>>
>>>> New patch attached.
>>>>
>>>> Jason
>>>>
>>>
>>> Now with SSE2 v-filter motion compensation.
>>>
>>> Jason
>>>
>>
>> Now with full SSE2 MC. ?I also went and updated the x264asm headers
>> (and associated asm) to the latest versions. ?This will be split in
>> the real commit.
>>
>> Jason
>>
>
> Now with SSSE3 h-filter. ?I'm pretty sure SSSE3 is something like 2-3
> times faster in this case, though I haven't benched any of it, I'm
> just going by the number of instructions.
>
> Jason
>

Now with full versions of all MC, including SSSE3.  Not as optimized
as it could be, but pretty good so far I think.

There are some... issues... with the current code that prevent commit.
 I will be bringing these up with Ronald soon ;)

Dark Shikari
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