Mar 16, 2019, 4:33 PM by [email protected] <mailto:[email protected]>:
> 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?
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