ref: f26afaa60dfa4c71426e56f537567d811b766c9e
dir: /silk/float/energy_FLP.c/
/***********************************************************************
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "SigProc_FLP.h"
/* sum of squares of a silk_float array, with result as double */
double silk_energy_FLP(
const silk_float *data,
opus_int dataSize
)
{
opus_int i;
double result;
/* 4x unrolled loop */
result = 0.0;
for( i = 0; i < dataSize - 3; i += 4 ) {
result += data[ i + 0 ] * (double)data[ i + 0 ] +
data[ i + 1 ] * (double)data[ i + 1 ] +
data[ i + 2 ] * (double)data[ i + 2 ] +
data[ i + 3 ] * (double)data[ i + 3 ];
}
/* add any remaining products */
for( ; i < dataSize; i++ ) {
result += data[ i ] * (double)data[ i ];
}
silk_assert( result >= 0.0 );
return result;
}