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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "SigProc_FLP.h"
33
34 /* sum of squares of a silk_float array, with result as double */
silk_energy_FLP(const silk_float * data,opus_int dataSize)35 double silk_energy_FLP(
36 const silk_float *data,
37 opus_int dataSize
38 )
39 {
40 opus_int i;
41 double result;
42
43 /* 4x unrolled loop */
44 result = 0.0;
45 for( i = 0; i < dataSize - 3; i += 4 ) {
46 result += data[ i + 0 ] * (double)data[ i + 0 ] +
47 data[ i + 1 ] * (double)data[ i + 1 ] +
48 data[ i + 2 ] * (double)data[ i + 2 ] +
49 data[ i + 3 ] * (double)data[ i + 3 ];
50 }
51
52 /* add any remaining products */
53 for( ; i < dataSize; i++ ) {
54 result += data[ i ] * (double)data[ i ];
55 }
56
57 silk_assert( result >= 0.0 );
58 return result;
59 }
60