[FFmpeg-devel] [PATCH 3/3] avcodec/h264: sse2 and avx 4:2:2 idct add8 10-bit functions

[James Darnley]

On 2016-11-30 13:57, Ronald S. Bultje wrote:
> On Wed, Nov 30, 2016 at 7:10 AM, James Darnley <jdarnley at obe.tv> wrote:
>>>     Nehalem:
>>>      - sse2:
>>>        - complex: 4.13x faster (1514 vs. 367 cycles)
>>>        - simple:  4.38x faster (1836 vs. 419 cycles)
>>>
>>>     Haswell:
>>>      - sse2:
>>>        - complex: 3.61x faster ( 936 vs. 260 cycles)
>>>        - simple:  3.97x faster (1126 vs. 284 cycles)
>>>      - avx (versus sse2):
>>>        - complex: 1.07x faster (260 vs. 244 cycles)
>>>        - simple:  1.03x faster (284 vs. 274 cycles)
>>
>> I included the sse2 results for the Haswell to show that the avx is
>> (slightly) better.
> 
> 
> Ah! Now it makes sense. I had no idea why your SSE2 results changed from
> 367 (SSE2 vs. C) to 260 cycles (AVX vs. SSE2).

Great.  If there are no further comments I will push later tonight.

First I need to correct the micro-architecture names.  Then I will
rebase onto the latest master and push.