cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
cannam@154: POSSIBILITY OF SUCH DAMAGE.
cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: #include "SigProc_FLP.h"
cannam@154: 
cannam@154: /* sum of squares of a silk_float array, with result as double */
cannam@154: double silk_energy_FLP(
cannam@154:     const silk_float    *data,
cannam@154:     opus_int            dataSize
cannam@154: )
cannam@154: {
cannam@154:     opus_int i;
cannam@154:     double   result;
cannam@154: 
cannam@154:     /* 4x unrolled loop */
cannam@154:     result = 0.0;
cannam@154:     for( i = 0; i < dataSize - 3; i += 4 ) {
cannam@154:         result += data[ i + 0 ] * (double)data[ i + 0 ] +
cannam@154:                   data[ i + 1 ] * (double)data[ i + 1 ] +
cannam@154:                   data[ i + 2 ] * (double)data[ i + 2 ] +
cannam@154:                   data[ i + 3 ] * (double)data[ i + 3 ];
cannam@154:     }
cannam@154: 
cannam@154:     /* add any remaining products */
cannam@154:     for( ; i < dataSize; i++ ) {
cannam@154:         result += data[ i ] * (double)data[ i ];
cannam@154:     }
cannam@154: 
cannam@154:     silk_assert( result >= 0.0 );
cannam@154:     return result;
cannam@154: }