Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
      12             : 
      13           0 : int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
      14             :                                       const int16_t* vector2,
      15             :                                       size_t length,
      16             :                                       int scaling) {
      17           0 :   int32_t sum = 0;
      18           0 :   size_t i = 0;
      19             : 
      20             :   /* Unroll the loop to improve performance. */
      21           0 :   for (i = 0; i + 3 < length; i += 4) {
      22           0 :     sum += (vector1[i + 0] * vector2[i + 0]) >> scaling;
      23           0 :     sum += (vector1[i + 1] * vector2[i + 1]) >> scaling;
      24           0 :     sum += (vector1[i + 2] * vector2[i + 2]) >> scaling;
      25           0 :     sum += (vector1[i + 3] * vector2[i + 3]) >> scaling;
      26             :   }
      27           0 :   for (; i < length; i++) {
      28           0 :     sum += (vector1[i] * vector2[i]) >> scaling;
      29             :   }
      30             : 
      31           0 :   return sum;
      32             : }