2 * This file is part of Libav.
4 * Libav 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.
9 * Libav 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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * Replacements for frequently missing libm functions
29 #include "attributes.h"
33 static av_always_inline float cbrtf(float x)
35 return x < 0 ? -powf(-x, 1.0 / 3.0) : powf(x, 1.0 / 3.0);
41 #define exp2(x) exp((x) * 0.693147180559945)
42 #endif /* HAVE_EXP2 */
46 #define exp2f(x) ((float)exp2(x))
47 #endif /* HAVE_EXP2F */
50 static av_always_inline av_const int isinf(float x)
52 uint32_t v = av_float2int(x);
53 if ((v & 0x7f800000) != 0x7f800000)
55 return !(v & 0x007fffff);
57 #endif /* HAVE_ISINF */
60 static av_always_inline av_const int isnan(float x)
62 uint32_t v = av_float2int(x);
63 if ((v & 0x7f800000) != 0x7f800000)
65 return v & 0x007fffff;
67 #endif /* HAVE_ISNAN */
71 #define llrint(x) ((long long)rint(x))
72 #endif /* HAVE_LLRINT */
76 #define llrintf(x) ((long long)rint(x))
77 #endif /* HAVE_LLRINT */
81 #define log2(x) (log(x) * 1.44269504088896340736)
82 #endif /* HAVE_LOG2 */
86 #define log2f(x) ((float)log2(x))
87 #endif /* HAVE_LOG2F */
90 static inline double rint(double x)
92 return x >= 0 ? floor(x + 0.5) : ceil(x - 0.5);
94 #endif /* HAVE_RINT */
97 static av_always_inline av_const long int lrint(double x)
101 #endif /* HAVE_LRINT */
104 static av_always_inline av_const long int lrintf(float x)
106 return (int)(rint(x));
108 #endif /* HAVE_LRINTF */
111 static av_always_inline av_const double round(double x)
113 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
115 #endif /* HAVE_ROUND */
118 static av_always_inline av_const float roundf(float x)
120 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
122 #endif /* HAVE_ROUNDF */
125 static av_always_inline av_const double trunc(double x)
127 return (x > 0) ? floor(x) : ceil(x);
129 #endif /* HAVE_TRUNC */
132 static av_always_inline av_const float truncf(float x)
134 return (x > 0) ? floor(x) : ceil(x);
136 #endif /* HAVE_TRUNCF */
138 #endif /* AVUTIL_LIBM_H */