[FFmpeg-devel] [PATCH 4/5] x86/opusdsp: implement FMA3 accelerated postfilter and deemphasis

[Carl Eugen Hoyos]

2019-03-29 19:05 GMT+01:00, Lynne <dev at lynne.ee>:
> Mar 16, 2019, 4:33 PM by dev at lynne.ee <mailto:dev at lynne.ee>:
>
>> 58893 decicycles in deemphasis_c,  130548 runs,    524 skips
>> 9475 decicycles in deemphasis_fma3,  130686 runs,    386 skips -> 6.21x
>> speedup
>>
>> 24866 decicycles in postfilter_c,   65386 runs,    150 skips
>> 5268 decicycles in postfilter_fma3,   65505 runs,     31 skips -> 4.72x
>> speedup
>>
>> Total decoder speedup: ~14%
>>
>> Deemphasis SIMD based on the following unrolling:
>> const float c1 = CELT_EMPH_COEFF, c2 = c1*c1, c3 = c2*c1, c4 = c3*c1;
>> float state = coeff;
>>
>> for (int i = 0; i < len; i += 4) {
>>     y[0] = x[0] + c1*state;
>>     y[1] = x[1] + c2*state + c1*x[0];
>>     y[2] = x[2] + c3*state + c1*x[1] + c2*x[0];
>>     y[3] = x[3] + c4*state + c1*x[2] + c2*x[1] + c3*x[0];
>>
>>     state = y[3];
>>     y += 4;
>>     x += 4;
>> }
>>
>
> Ping to this part of the patchset while I fix android?

Done.

Please run fate on future patches (it did not pass).

Carl Eugen