cpu.h (5682B)
1 /* 2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard 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_CPU_H 22 #define AVUTIL_CPU_H 23 24 #include <stddef.h> 25 26 #include "attributes.h" 27 28 #define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */ 29 30 /* lower 16 bits - CPU features */ 31 #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX 32 #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext 33 #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext 34 #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW 35 #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions 36 #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions 37 #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster 38 ///< than regular MMX/SSE (e.g. Core1) 39 #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt 40 #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions 41 #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster 42 ///< than regular MMX/SSE (e.g. Core1) 43 #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions 44 #define AV_CPU_FLAG_SSSE3SLOW 0x4000000 ///< SSSE3 supported, but usually not faster 45 #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower 46 #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions 47 #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions 48 #define AV_CPU_FLAG_AESNI 0x80000 ///< Advanced Encryption Standard functions 49 #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used 50 #define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer) 51 #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions 52 #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions 53 #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 58 #define AV_CPU_FLAG_AVX512 0x100000 ///< AVX-512 functions: requires OS support even if YMM/ZMM registers aren't used 59 60 #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard 61 #define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06 62 #define AV_CPU_FLAG_POWER8 0x0004 ///< ISA 2.07 63 64 #define AV_CPU_FLAG_ARMV5TE (1 << 0) 65 #define AV_CPU_FLAG_ARMV6 (1 << 1) 66 #define AV_CPU_FLAG_ARMV6T2 (1 << 2) 67 #define AV_CPU_FLAG_VFP (1 << 3) 68 #define AV_CPU_FLAG_VFPV3 (1 << 4) 69 #define AV_CPU_FLAG_NEON (1 << 5) 70 #define AV_CPU_FLAG_ARMV8 (1 << 6) 71 #define AV_CPU_FLAG_VFP_VM (1 << 7) ///< VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations 72 #define AV_CPU_FLAG_SETEND (1 <<16) 73 74 /** 75 * Return the flags which specify extensions supported by the CPU. 76 * The returned value is affected by av_force_cpu_flags() if that was used 77 * before. So av_get_cpu_flags() can easily be used in an application to 78 * detect the enabled cpu flags. 79 */ 80 int av_get_cpu_flags(void); 81 82 /** 83 * Disables cpu detection and forces the specified flags. 84 * -1 is a special case that disables forcing of specific flags. 85 */ 86 void av_force_cpu_flags(int flags); 87 88 /** 89 * Set a mask on flags returned by av_get_cpu_flags(). 90 * This function is mainly useful for testing. 91 * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible 92 */ 93 attribute_deprecated void av_set_cpu_flags_mask(int mask); 94 95 /** 96 * Parse CPU flags from a string. 97 * 98 * The returned flags contain the specified flags as well as related unspecified flags. 99 * 100 * This function exists only for compatibility with libav. 101 * Please use av_parse_cpu_caps() when possible. 102 * @return a combination of AV_CPU_* flags, negative on error. 103 */ 104 attribute_deprecated 105 int av_parse_cpu_flags(const char *s); 106 107 /** 108 * Parse CPU caps from a string and update the given AV_CPU_* flags based on that. 109 * 110 * @return negative on error. 111 */ 112 int av_parse_cpu_caps(unsigned *flags, const char *s); 113 114 /** 115 * @return the number of logical CPU cores present. 116 */ 117 int av_cpu_count(void); 118 119 /** 120 * Get the maximum data alignment that may be required by FFmpeg. 121 * 122 * Note that this is affected by the build configuration and the CPU flags mask, 123 * so e.g. if the CPU supports AVX, but libavutil has been built with 124 * --disable-avx or the AV_CPU_FLAG_AVX flag has been disabled through 125 * av_set_cpu_flags_mask(), then this function will behave as if AVX is not 126 * present. 127 */ 128 size_t av_cpu_max_align(void); 129 130 #endif /* AVUTIL_CPU_H */