FFmpeg
cpu.h
Go to the documentation of this file.
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 #include "version.h"
26 
27 #if FF_API_CPU_FLAG_FORCE
28 #define AV_CPU_FLAG_FORCE 0x80000000 /* @deprecated, should not be used */
29 #endif
30 
31  /* lower 16 bits - CPU features */
32 #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
33 #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
34 #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
35 #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
36 #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
37 #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
38 #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
39  ///< than regular MMX/SSE (e.g. Core1)
40 #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
41 #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
42 #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
43  ///< than regular MMX/SSE (e.g. Core1)
44 #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
45 #define AV_CPU_FLAG_SSSE3SLOW 0x4000000 ///< SSSE3 supported, but usually not faster
46 #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
47 #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
48 #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
49 #define AV_CPU_FLAG_AESNI 0x80000 ///< Advanced Encryption Standard functions
50 #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
51 #define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
52 #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
53 #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
54 #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
55 #define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
56 #define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
57 #define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
58 #define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
59 #define AV_CPU_FLAG_AVX512 0x100000 ///< AVX-512 functions: requires OS support even if YMM/ZMM registers aren't used
60 #define AV_CPU_FLAG_AVX512ICL 0x200000 ///< F/CD/BW/DQ/VL/VNNI/IFMA/VBMI/VBMI2/VPOPCNTDQ/BITALG/GFNI/VAES/VPCLMULQDQ
61 #define AV_CPU_FLAG_SLOW_GATHER 0x2000000 ///< CPU has slow gathers.
62 
63 #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
64 #define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06
65 #define AV_CPU_FLAG_POWER8 0x0004 ///< ISA 2.07
66 
67 #define AV_CPU_FLAG_ARMV5TE (1 << 0)
68 #define AV_CPU_FLAG_ARMV6 (1 << 1)
69 #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
70 #define AV_CPU_FLAG_VFP (1 << 3)
71 #define AV_CPU_FLAG_VFPV3 (1 << 4)
72 #define AV_CPU_FLAG_NEON (1 << 5)
73 #define AV_CPU_FLAG_ARMV8 (1 << 6)
74 #define AV_CPU_FLAG_VFP_VM (1 << 7) ///< VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations
75 #define AV_CPU_FLAG_DOTPROD (1 << 8)
76 #define AV_CPU_FLAG_I8MM (1 << 9)
77 #define AV_CPU_FLAG_SVE (1 <<10)
78 #define AV_CPU_FLAG_SVE2 (1 <<11)
79 #define AV_CPU_FLAG_SETEND (1 <<16)
80 
81 #define AV_CPU_FLAG_MMI (1 << 0)
82 #define AV_CPU_FLAG_MSA (1 << 1)
83 
84 //Loongarch SIMD extension.
85 #define AV_CPU_FLAG_LSX (1 << 0)
86 #define AV_CPU_FLAG_LASX (1 << 1)
87 
88 // RISC-V extensions
89 #define AV_CPU_FLAG_RVI (1 << 0) ///< I (full GPR bank)
90 #if FF_API_RISCV_FD_ZBA
91 #define AV_CPU_FLAG_RVF (1 << 1) ///< F (single precision FP)
92 #define AV_CPU_FLAG_RVD (1 << 2) ///< D (double precision FP)
93 #endif
94 #define AV_CPU_FLAG_RVV_I32 (1 << 3) ///< Vectors of 8/16/32-bit int's */
95 #define AV_CPU_FLAG_RVV_F32 (1 << 4) ///< Vectors of float's */
96 #define AV_CPU_FLAG_RVV_I64 (1 << 5) ///< Vectors of 64-bit int's */
97 #define AV_CPU_FLAG_RVV_F64 (1 << 6) ///< Vectors of double's
98 #define AV_CPU_FLAG_RVB_BASIC (1 << 7) ///< Basic bit-manipulations
99 #if FF_API_RISCV_FD_ZBA
100 #define AV_CPU_FLAG_RVB_ADDR (1 << 8) ///< Address bit-manipulations
101 #endif
102 #define AV_CPU_FLAG_RV_ZVBB (1 << 9) ///< Vector basic bit-manipulations
103 #define AV_CPU_FLAG_RV_MISALIGNED (1 <<10) ///< Fast misaligned accesses
104 #define AV_CPU_FLAG_RVB (1 <<11) ///< B (bit manipulations)
105 
106 // WASM extensions
107 #define AV_CPU_FLAG_SIMD128 (1 << 0)
108 
109 /**
110  * Return the flags which specify extensions supported by the CPU.
111  * The returned value is affected by av_force_cpu_flags() if that was used
112  * before. So av_get_cpu_flags() can easily be used in an application to
113  * detect the enabled cpu flags.
114  */
115 int av_get_cpu_flags(void);
116 
117 /**
118  * Disables cpu detection and forces the specified flags.
119  * -1 is a special case that disables forcing of specific flags.
120  */
121 void av_force_cpu_flags(int flags);
122 
123 /**
124  * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
125  *
126  * @return negative on error.
127  */
128 int av_parse_cpu_caps(unsigned *flags, const char *s);
129 
130 /**
131  * @return the number of logical CPU cores present.
132  */
133 int av_cpu_count(void);
134 
135 /**
136  * Overrides cpu count detection and forces the specified count.
137  * Count < 1 disables forcing of specific count.
138  */
139 void av_cpu_force_count(int count);
140 
141 /**
142  * Get the maximum data alignment that may be required by FFmpeg.
143  *
144  * Note that this is affected by the build configuration and the CPU flags mask,
145  * so e.g. if the CPU supports AVX, but libavutil has been built with
146  * --disable-avx or the AV_CPU_FLAG_AVX flag has been disabled through
147  * av_set_cpu_flags_mask(), then this function will behave as if AVX is not
148  * present.
149  */
150 size_t av_cpu_max_align(void);
151 
152 #endif /* AVUTIL_CPU_H */
flags
const SwsFlags flags[]
Definition: swscale.c:61
av_parse_cpu_caps
int av_parse_cpu_caps(unsigned *flags, const char *s)
Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
Definition: cpu.c:119
av_cpu_force_count
void av_cpu_force_count(int count)
Overrides cpu count detection and forces the specified count.
Definition: cpu.c:275
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_cpu_max_align
size_t av_cpu_max_align(void)
Get the maximum data alignment that may be required by FFmpeg.
Definition: cpu.c:280
av_cpu_count
int av_cpu_count(void)
Definition: cpu.c:221
av_force_cpu_flags
void av_force_cpu_flags(int flags)
Disables cpu detection and forces the specified flags.
Definition: cpu.c:81
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:109
version.h
Generated on Fri Nov 21 2025 19:23:12 for FFmpeg by   doxygen 1.8.17