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
12/* This header file includes the inline functions for ARM processors in
13 * the fix point signal processing library.
14 */
15
16#ifndef WEBRTC_SPL_SPL_INL_ARMV7_H_
17#define WEBRTC_SPL_SPL_INL_ARMV7_H_
18
19/* TODO(kma): Replace some assembly code with GCC intrinsics
20 * (e.g. __builtin_clz).
21 */
22
23/* This function produces result that is not bit exact with that by the generic
24 * C version in some cases, although the former is at least as accurate as the
25 * later.
26 */
27static __inline int32_t WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a, int32_t b) {
28  int32_t tmp = 0;
29  __asm __volatile ("smulwb %0, %1, %2":"=r"(tmp):"r"(b), "r"(a));
30  return tmp;
31}
32
33static __inline int32_t WEBRTC_SPL_MUL_16_16(int16_t a, int16_t b) {
34  int32_t tmp = 0;
35  __asm __volatile ("smulbb %0, %1, %2":"=r"(tmp):"r"(a), "r"(b));
36  return tmp;
37}
38
39// TODO(kma): add unit test.
40static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
41  int32_t tmp = 0;
42  __asm __volatile ("smlabb %0, %1, %2, %3":"=r"(tmp):"r"(a), "r"(b), "r"(c));
43  return tmp;
44}
45
46static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
47  int32_t s_sum = 0;
48
49  __asm __volatile ("qadd16 %0, %1, %2":"=r"(s_sum):"r"(a), "r"(b));
50
51  return (int16_t) s_sum;
52}
53
54static __inline int32_t WebRtcSpl_AddSatW32(int32_t l_var1, int32_t l_var2) {
55  int32_t l_sum = 0;
56
57  __asm __volatile ("qadd %0, %1, %2":"=r"(l_sum):"r"(l_var1), "r"(l_var2));
58
59  return l_sum;
60}
61
62static __inline int32_t WebRtcSpl_SubSatW32(int32_t l_var1, int32_t l_var2) {
63  int32_t l_sub = 0;
64
65  __asm __volatile ("qsub %0, %1, %2":"=r"(l_sub):"r"(l_var1), "r"(l_var2));
66
67  return l_sub;
68}
69
70static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
71  int32_t s_sub = 0;
72
73  __asm __volatile ("qsub16 %0, %1, %2":"=r"(s_sub):"r"(var1), "r"(var2));
74
75  return (int16_t)s_sub;
76}
77
78static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
79  int32_t tmp = 0;
80
81  __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(n));
82
83  return (int16_t)(32 - tmp);
84}
85
86static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
87  int32_t tmp = 0;
88
89  if (a == 0) {
90    return 0;
91  }
92  else if (a < 0) {
93    a ^= 0xFFFFFFFF;
94  }
95
96  __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a));
97
98  return (int16_t)(tmp - 1);
99}
100
101static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
102  int tmp = 0;
103
104  if (a == 0) return 0;
105
106  __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a));
107
108  return (int16_t)tmp;
109}
110
111static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
112  int32_t tmp = 0;
113
114  if (a == 0) {
115    return 0;
116  }
117  else if (a < 0) {
118    a ^= 0xFFFFFFFF;
119  }
120
121  __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a));
122
123  return (int16_t)(tmp - 17);
124}
125
126// TODO(kma): add unit test.
127static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
128  int32_t out = 0;
129
130  __asm __volatile ("ssat %0, #16, %1" : "=r"(out) : "r"(value32));
131
132  return (int16_t)out;
133}
134
135#endif  // WEBRTC_SPL_SPL_INL_ARMV7_H_
136