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 /* This header file includes the inline functions for ARM processors in
12 * the fix point signal processing library.
13 */
14
15 #ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
16 #define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
17
18 #include <stdint.h>
19
20 /* TODO(kma): Replace some assembly code with GCC intrinsics
21 * (e.g. __builtin_clz).
22 */
23
24 /* This function produces result that is not bit exact with that by the generic
25 * C version in some cases, although the former is at least as accurate as the
26 * later.
27 */
WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a,int32_t b)28 static __inline int32_t WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a, int32_t b) {
29 int32_t tmp = 0;
30 __asm __volatile("smulwb %0, %1, %2" : "=r"(tmp) : "r"(b), "r"(a));
31 return tmp;
32 }
33
WEBRTC_SPL_MUL_16_16(int16_t a,int16_t b)34 static __inline int32_t WEBRTC_SPL_MUL_16_16(int16_t a, int16_t b) {
35 int32_t tmp = 0;
36 __asm __volatile("smulbb %0, %1, %2" : "=r"(tmp) : "r"(a), "r"(b));
37 return tmp;
38 }
39
40 // TODO(kma): add unit test.
WebRtc_MulAccumW16(int16_t a,int16_t b,int32_t c)41 static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
42 int32_t tmp = 0;
43 __asm __volatile("smlabb %0, %1, %2, %3"
44 : "=r"(tmp)
45 : "r"(a), "r"(b), "r"(c));
46 return tmp;
47 }
48
WebRtcSpl_AddSatW16(int16_t a,int16_t b)49 static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
50 int32_t s_sum = 0;
51
52 __asm __volatile("qadd16 %0, %1, %2" : "=r"(s_sum) : "r"(a), "r"(b));
53
54 return (int16_t)s_sum;
55 }
56
WebRtcSpl_AddSatW32(int32_t l_var1,int32_t l_var2)57 static __inline int32_t WebRtcSpl_AddSatW32(int32_t l_var1, int32_t l_var2) {
58 int32_t l_sum = 0;
59
60 __asm __volatile("qadd %0, %1, %2" : "=r"(l_sum) : "r"(l_var1), "r"(l_var2));
61
62 return l_sum;
63 }
64
WebRtcSpl_SubSatW32(int32_t l_var1,int32_t l_var2)65 static __inline int32_t WebRtcSpl_SubSatW32(int32_t l_var1, int32_t l_var2) {
66 int32_t l_sub = 0;
67
68 __asm __volatile("qsub %0, %1, %2" : "=r"(l_sub) : "r"(l_var1), "r"(l_var2));
69
70 return l_sub;
71 }
72
WebRtcSpl_SubSatW16(int16_t var1,int16_t var2)73 static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
74 int32_t s_sub = 0;
75
76 __asm __volatile("qsub16 %0, %1, %2" : "=r"(s_sub) : "r"(var1), "r"(var2));
77
78 return (int16_t)s_sub;
79 }
80
WebRtcSpl_GetSizeInBits(uint32_t n)81 static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
82 int32_t tmp = 0;
83
84 __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(n));
85
86 return (int16_t)(32 - tmp);
87 }
88
WebRtcSpl_NormW32(int32_t a)89 static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
90 int32_t tmp = 0;
91
92 if (a == 0) {
93 return 0;
94 } else if (a < 0) {
95 a ^= 0xFFFFFFFF;
96 }
97
98 __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a));
99
100 return (int16_t)(tmp - 1);
101 }
102
WebRtcSpl_NormU32(uint32_t a)103 static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
104 int tmp = 0;
105
106 if (a == 0)
107 return 0;
108
109 __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a));
110
111 return (int16_t)tmp;
112 }
113
WebRtcSpl_NormW16(int16_t a)114 static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
115 int32_t tmp = 0;
116 int32_t a_32 = a;
117
118 if (a_32 == 0) {
119 return 0;
120 } else if (a_32 < 0) {
121 a_32 ^= 0xFFFFFFFF;
122 }
123
124 __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a_32));
125
126 return (int16_t)(tmp - 17);
127 }
128
129 // TODO(kma): add unit test.
WebRtcSpl_SatW32ToW16(int32_t value32)130 static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
131 int32_t out = 0;
132
133 __asm __volatile("ssat %0, #16, %1" : "=r"(out) : "r"(value32));
134
135 return (int16_t)out;
136 }
137
138 #endif // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
139