1/*
2 *  Copyright (c) 2011 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
12/*
13 * This file contains the function WebRtcSpl_DotProductWithScale().
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18#include "signal_processing_library.h"
19
20WebRtc_Word32 WebRtcSpl_DotProductWithScale(WebRtc_Word16 *vector1, WebRtc_Word16 *vector2,
21                                            int length, int scaling)
22{
23    WebRtc_Word32 sum;
24    int i;
25#ifdef _ARM_OPT_
26#pragma message("NOTE: _ARM_OPT_ optimizations are used")
27    WebRtc_Word16 len4 = (length >> 2) << 2;
28#endif
29
30    sum = 0;
31
32#ifndef _ARM_OPT_
33    for (i = 0; i < length; i++)
34    {
35        sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1++, *vector2++, scaling);
36    }
37#else
38    if (scaling == 0)
39    {
40        for (i = 0; i < len4; i = i + 4)
41        {
42            sum += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
43            vector1++;
44            vector2++;
45            sum += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
46            vector1++;
47            vector2++;
48            sum += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
49            vector1++;
50            vector2++;
51            sum += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
52            vector1++;
53            vector2++;
54        }
55
56        for (i = len4; i < length; i++)
57        {
58            sum += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
59            vector1++;
60            vector2++;
61        }
62    }
63    else
64    {
65        for (i = 0; i < len4; i = i + 4)
66        {
67            sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1, *vector2, scaling);
68            vector1++;
69            vector2++;
70            sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1, *vector2, scaling);
71            vector1++;
72            vector2++;
73            sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1, *vector2, scaling);
74            vector1++;
75            vector2++;
76            sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1, *vector2, scaling);
77            vector1++;
78            vector2++;
79        }
80
81        for (i = len4; i < length; i++)
82        {
83            sum += WEBRTC_SPL_MUL_16_16_RSFT(*vector1, *vector2, scaling);
84            vector1++;
85            vector2++;
86        }
87    }
88#endif
89
90    return sum;
91}
92