[FFmpeg-devel] [PATCH] avcodec/v210enc: add new function for avx2 avx512 avx512icl

[James Darnley]

>> +        %else
>> +            pand       m1, m6, m1
>> +            pandn      m0, m6, m0
>> +            por        m0, m0, m1
>> +        %endif
> 
> Isn't that pattern a vpblendb or some such ?

I think Kieran already responded to this on IRC but I will too. 
Unfortunately not.  This blend is at the bit level.  This is v210 so the 
packing has the middle sample overlapping with the bottom sample in the 
second byte.

I also want to amend my performance numbers on Broadwell.  I can confirm 
Kieran's disagreement and can reproduce the 10% speed up on it:
     1676±14.6 vs 1426±20.9

I will re-check Zen and amend the commit message as necessary.