exp2 is faster.
It may be possible to optimize further; e.g the exponents seem to be
multiples of 0.25. This requires study though.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
for (i = s->startband; i < s->endband; i++) {
float *dst = data + (celt_freq_bands[i] << s->duration);
- float norm = pow(2, frame->energy[i] + celt_mean_energy[i]);
+ float norm = exp2(frame->energy[i] + celt_mean_energy[i]);
for (j = 0; j < celt_freq_range[i] << s->duration; j++)
dst[j] *= norm;
/* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
short blocks don't have the same energy as long */
- r = pow(2, 1 - Ediff);
+ r = exp2(1 - Ediff);
if (s->duration == 3)
r *= M_SQRT2;
r = FFMIN(thresh, r) * sqrt_1;