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libm.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * Replacements for frequently missing libm functions
22  */
23 
24 #ifndef AVUTIL_LIBM_H
25 #define AVUTIL_LIBM_H
26 
27 #include <math.h>
28 #include "config.h"
29 #include "attributes.h"
30 #include "intfloat.h"
31 
32 #if HAVE_MIPSFPU && HAVE_INLINE_ASM
34 #endif /* HAVE_MIPSFPU && HAVE_INLINE_ASM*/
35 
36 #if !HAVE_ATANF
37 #undef atanf
38 #define atanf(x) ((float)atan(x))
39 #endif
40 
41 #if !HAVE_ATAN2F
42 #undef atan2f
43 #define atan2f(y, x) ((float)atan2(y, x))
44 #endif
45 
46 #if !HAVE_POWF
47 #undef powf
48 #define powf(x, y) ((float)pow(x, y))
49 #endif
50 
51 #if !HAVE_CBRT
52 static av_always_inline double cbrt(double x)
53 {
54  return x < 0 ? -pow(-x, 1.0 / 3.0) : pow(x, 1.0 / 3.0);
55 }
56 #endif
57 
58 #if !HAVE_CBRTF
59 static av_always_inline float cbrtf(float x)
60 {
61  return x < 0 ? -powf(-x, 1.0 / 3.0) : powf(x, 1.0 / 3.0);
62 }
63 #endif
64 
65 #if !HAVE_COSF
66 #undef cosf
67 #define cosf(x) ((float)cos(x))
68 #endif
69 
70 #if !HAVE_EXPF
71 #undef expf
72 #define expf(x) ((float)exp(x))
73 #endif
74 
75 #if !HAVE_EXP2
76 #undef exp2
77 #define exp2(x) exp((x) * 0.693147180559945)
78 #endif /* HAVE_EXP2 */
79 
80 #if !HAVE_EXP2F
81 #undef exp2f
82 #define exp2f(x) ((float)exp2(x))
83 #endif /* HAVE_EXP2F */
84 
85 #if !HAVE_ISINF
86 static av_always_inline av_const int isinf(float x)
87 {
88  uint32_t v = av_float2int(x);
89  if ((v & 0x7f800000) != 0x7f800000)
90  return 0;
91  return !(v & 0x007fffff);
92 }
93 #endif /* HAVE_ISINF */
94 
95 #if !HAVE_ISNAN
96 static av_always_inline av_const int isnan(float x)
97 {
98  uint32_t v = av_float2int(x);
99  if ((v & 0x7f800000) != 0x7f800000)
100  return 0;
101  return v & 0x007fffff;
102 }
103 #endif /* HAVE_ISNAN */
104 
105 #if !HAVE_LDEXPF
106 #undef ldexpf
107 #define ldexpf(x, exp) ((float)ldexp(x, exp))
108 #endif
109 
110 #if !HAVE_LLRINT
111 #undef llrint
112 #define llrint(x) ((long long)rint(x))
113 #endif /* HAVE_LLRINT */
114 
115 #if !HAVE_LLRINTF
116 #undef llrintf
117 #define llrintf(x) ((long long)rint(x))
118 #endif /* HAVE_LLRINT */
119 
120 #if !HAVE_LOG2
121 #undef log2
122 #define log2(x) (log(x) * 1.44269504088896340736)
123 #endif /* HAVE_LOG2 */
124 
125 #if !HAVE_LOG2F
126 #undef log2f
127 #define log2f(x) ((float)log2(x))
128 #endif /* HAVE_LOG2F */
129 
130 #if !HAVE_LOG10F
131 #undef log10f
132 #define log10f(x) ((float)log10(x))
133 #endif
134 
135 #if !HAVE_SINF
136 #undef sinf
137 #define sinf(x) ((float)sin(x))
138 #endif
139 
140 #if !HAVE_RINT
141 static inline double rint(double x)
142 {
143  return x >= 0 ? floor(x + 0.5) : ceil(x - 0.5);
144 }
145 #endif /* HAVE_RINT */
146 
147 #if !HAVE_LRINT
148 static av_always_inline av_const long int lrint(double x)
149 {
150  return rint(x);
151 }
152 #endif /* HAVE_LRINT */
153 
154 #if !HAVE_LRINTF
155 static av_always_inline av_const long int lrintf(float x)
156 {
157  return (int)(rint(x));
158 }
159 #endif /* HAVE_LRINTF */
160 
161 #if !HAVE_ROUND
162 static av_always_inline av_const double round(double x)
163 {
164  return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
165 }
166 #endif /* HAVE_ROUND */
167 
168 #if !HAVE_ROUNDF
169 static av_always_inline av_const float roundf(float x)
170 {
171  return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
172 }
173 #endif /* HAVE_ROUNDF */
174 
175 #if !HAVE_TRUNC
176 static av_always_inline av_const double trunc(double x)
177 {
178  return (x > 0) ? floor(x) : ceil(x);
179 }
180 #endif /* HAVE_TRUNC */
181 
182 #if !HAVE_TRUNCF
183 static av_always_inline av_const float truncf(float x)
184 {
185  return (x > 0) ? floor(x) : ceil(x);
186 }
187 #endif /* HAVE_TRUNCF */
188 
189 #endif /* AVUTIL_LIBM_H */