FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
intmath.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 James Almer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_X86_INTMATH_H
22 #define AVUTIL_X86_INTMATH_H
23 
24 #include <stdint.h>
25 #include "config.h"
26 
27 /* Our generic version of av_popcount is faster than GCC's built-in on
28  * CPUs that don't support the popcnt instruction.
29  */
30 #if defined(__GNUC__) && defined(__POPCNT__)
31  #define av_popcount __builtin_popcount
32 #if ARCH_X86_64
33  #define av_popcount64 __builtin_popcountll
34 #endif
35 
36 #endif /* defined(__GNUC__) && defined(__POPCNT__) */
37 
38 #endif /* AVUTIL_X86_INTMATH_H */