2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
24 #include "attributes.h"
26 #define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
28 /* lower 16 bits - CPU features */
29 #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
30 #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
31 #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
32 #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
33 #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
34 #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
35 #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
36 ///< than regular MMX/SSE (e.g. Core1)
37 #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
38 #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
39 #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
40 ///< than regular MMX/SSE (e.g. Core1)
41 #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
42 #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
43 #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
44 #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
45 #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
46 #define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
47 #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
48 #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
49 // #if LIBAVUTIL_VERSION_MAJOR <52
50 #define AV_CPU_FLAG_CMOV 0x1001000 ///< supports cmov instruction
52 // #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
54 #define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
55 #define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
56 #define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
57 #define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
59 #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
61 #define AV_CPU_FLAG_ARMV5TE (1 << 0)
62 #define AV_CPU_FLAG_ARMV6 (1 << 1)
63 #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
64 #define AV_CPU_FLAG_VFP (1 << 3)
65 #define AV_CPU_FLAG_VFPV3 (1 << 4)
66 #define AV_CPU_FLAG_NEON (1 << 5)
67 #define AV_CPU_FLAG_ARMV8 (1 << 6)
68 #define AV_CPU_FLAG_SETEND (1 <<16)
71 * Return the flags which specify extensions supported by the CPU.
72 * The returned value is affected by av_force_cpu_flags() if that was used
73 * before. So av_get_cpu_flags() can easily be used in a application to
74 * detect the enabled cpu flags.
76 int av_get_cpu_flags(void);
79 * Disables cpu detection and forces the specified flags.
80 * -1 is a special case that disables forcing of specific flags.
82 void av_force_cpu_flags(int flags);
85 * Set a mask on flags returned by av_get_cpu_flags().
86 * This function is mainly useful for testing.
87 * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
89 * @warning this function is not thread safe.
91 attribute_deprecated void av_set_cpu_flags_mask(int mask);
94 * Parse CPU flags from a string.
96 * The returned flags contain the specified flags as well as related unspecified flags.
98 * This function exists only for compatibility with libav.
99 * Please use av_parse_cpu_caps() when possible.
100 * @return a combination of AV_CPU_* flags, negative on error.
103 int av_parse_cpu_flags(const char *s);
106 * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
108 * @return negative on error.
110 int av_parse_cpu_caps(unsigned *flags, const char *s);
113 * @return the number of logical CPU cores present.
115 int av_cpu_count(void);
117 #endif /* AVUTIL_CPU_H */