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_SubSatW16().
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18#include "signal_processing_library.h"
19
20#ifndef SPL_NO_DOUBLE_IMPLEMENTATIONS
21#ifndef XSCALE_OPT
22
23WebRtc_Word16 WebRtcSpl_SubSatW16(WebRtc_Word16 var1, WebRtc_Word16 var2)
24{
25    WebRtc_Word32 l_diff;
26    WebRtc_Word16 s_diff;
27
28    // perform subtraction
29    l_diff = (WebRtc_Word32)var1 - (WebRtc_Word32)var2;
30
31    // default setting
32    s_diff = (WebRtc_Word16)l_diff;
33
34    // check for overflow
35    if (l_diff > (WebRtc_Word32)32767)
36        s_diff = (WebRtc_Word16)32767;
37
38    // check for underflow
39    if (l_diff < (WebRtc_Word32)-32768)
40        s_diff = (WebRtc_Word16)-32768;
41
42    return s_diff;
43}
44
45#else
46#pragma message(">> WebRtcSpl_SubSatW16.c is excluded from this build")
47#endif // XSCALE_OPT
48#endif // SPL_NO_DOUBLE_IMPLEMENTATIONS
49