[FFmpeg-devel] [PATCH] VP8 MMX optimizations (MC and IDCT dc_add)
Wed Jun 23 01:31:15 CEST 2010
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:
>> 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. ;-).
> New patch attached.
Now with SSE2 v-filter motion compensation.
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