Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #include "SigProc_FLP.h"
Chris@69: 
Chris@69: /* sum of squares of a silk_float array, with result as double */
Chris@69: double silk_energy_FLP(
Chris@69:     const silk_float    *data,
Chris@69:     opus_int            dataSize
Chris@69: )
Chris@69: {
Chris@69:     opus_int i;
Chris@69:     double   result;
Chris@69: 
Chris@69:     /* 4x unrolled loop */
Chris@69:     result = 0.0;
Chris@69:     for( i = 0; i < dataSize - 3; i += 4 ) {
Chris@69:         result += data[ i + 0 ] * (double)data[ i + 0 ] +
Chris@69:                   data[ i + 1 ] * (double)data[ i + 1 ] +
Chris@69:                   data[ i + 2 ] * (double)data[ i + 2 ] +
Chris@69:                   data[ i + 3 ] * (double)data[ i + 3 ];
Chris@69:     }
Chris@69: 
Chris@69:     /* add any remaining products */
Chris@69:     for( ; i < dataSize; i++ ) {
Chris@69:         result += data[ i ] * (double)data[ i ];
Chris@69:     }
Chris@69: 
Chris@69:     silk_assert( result >= 0.0 );
Chris@69:     return result;
Chris@69: }