2 * This file is part of FFmpeg.
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.
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.
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
21 * Replacements for frequently missing libm functions
29 #include "attributes.h"
33 #define exp2(x) exp((x) * 0.693147180559945)
34 #endif /* HAVE_EXP2 */
38 #define exp2f(x) ((float)exp2(x))
39 #endif /* HAVE_EXP2F */
43 #define llrint(x) ((long long)rint(x))
44 #endif /* HAVE_LLRINT */
48 #define llrintf(x) ((long long)rint(x))
49 #endif /* HAVE_LLRINT */
53 #define log2(x) (log(x) * 1.44269504088896340736)
54 #endif /* HAVE_LOG2 */
58 #define log2f(x) ((float)log2(x))
59 #endif /* HAVE_LOG2F */
62 static av_always_inline av_const long int lrint(double x)
66 #endif /* HAVE_LRINT */
69 static av_always_inline av_const long int lrintf(float x)
71 return (int)(rint(x));
73 #endif /* HAVE_LRINTF */
76 static av_always_inline av_const double round(double x)
78 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
80 #endif /* HAVE_ROUND */
83 static av_always_inline av_const float roundf(float x)
85 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
87 #endif /* HAVE_ROUNDF */
90 static av_always_inline av_const double trunc(double x)
92 return (x > 0) ? floor(x) : ceil(x);
94 #endif /* HAVE_TRUNC */
97 static av_always_inline av_const float truncf(float x)
99 return (x > 0) ? floor(x) : ceil(x);
101 #endif /* HAVE_TRUNCF */
103 #endif /* AVUTIL_LIBM_H */