andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 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 | |
pbos@webrtc.org | abf0cd8 | 2013-05-27 09:49:58 +0000 | [diff] [blame] | 11 | #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 12 | |
| 13 | int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1, |
| 14 | const int16_t* vector2, |
| 15 | int length, |
| 16 | int scaling) { |
| 17 | int32_t sum = 0; |
| 18 | int i = 0; |
| 19 | |
| 20 | /* Unroll the loop to improve performance. */ |
| 21 | for (i = 0; i < length - 3; 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 | } |