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 int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1, 14 const int16_t* vector2, 15 size_t length, 16 int scaling) { 17 int32_t sum = 0; 18 size_t i = 0; 19 20 /* Unroll the loop to improve performance. */ 21 for (i = 0; i + 3 < length; i += 4) { 22 sum += (vector1[i + 0] * vector2[i + 0]) >> scaling; 23 sum += (vector1[i + 1] * vector2[i + 1]) >> scaling; 24 sum += (vector1[i + 2] * vector2[i + 2]) >> scaling; 25 sum += (vector1[i + 3] * vector2[i + 3]) >> scaling; 26 } 27 for (; i < length; i++) { 28 sum += (vector1[i] * vector2[i]) >> scaling; 29 } 30 31 return sum; 32 } 33
