FFmpeg 7.1.1
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cpu.h
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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#define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
28
29 /* lower 16 bits - CPU features */
30#define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
31#define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
32#define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
33#define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
34#define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
35#define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
36#define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
37 ///< than regular MMX/SSE (e.g. Core1)
38#define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
39#define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
40#define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
41 ///< than regular MMX/SSE (e.g. Core1)
42#define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
43#define AV_CPU_FLAG_SSSE3SLOW 0x4000000 ///< SSSE3 supported, but usually not faster
44#define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
45#define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
46#define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
47#define AV_CPU_FLAG_AESNI 0x80000 ///< Advanced Encryption Standard functions
48#define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
49#define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
50#define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
51#define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
52#define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
53#define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
54#define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
55#define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
56#define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
57#define AV_CPU_FLAG_AVX512 0x100000 ///< AVX-512 functions: requires OS support even if YMM/ZMM registers aren't used
58#define AV_CPU_FLAG_AVX512ICL 0x200000 ///< F/CD/BW/DQ/VL/VNNI/IFMA/VBMI/VBMI2/VPOPCNTDQ/BITALG/GFNI/VAES/VPCLMULQDQ
59#define AV_CPU_FLAG_SLOW_GATHER 0x2000000 ///< CPU has slow gathers.
60
61#define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
62#define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06
63#define AV_CPU_FLAG_POWER8 0x0004 ///< ISA 2.07
64
65#define AV_CPU_FLAG_ARMV5TE (1 << 0)
66#define AV_CPU_FLAG_ARMV6 (1 << 1)
67#define AV_CPU_FLAG_ARMV6T2 (1 << 2)
68#define AV_CPU_FLAG_VFP (1 << 3)
69#define AV_CPU_FLAG_VFPV3 (1 << 4)
70#define AV_CPU_FLAG_NEON (1 << 5)
71#define AV_CPU_FLAG_ARMV8 (1 << 6)
72#define AV_CPU_FLAG_VFP_VM (1 << 7) ///< VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations
73#define AV_CPU_FLAG_DOTPROD (1 << 8)
74#define AV_CPU_FLAG_I8MM (1 << 9)
75#define AV_CPU_FLAG_SETEND (1 <<16)
76
77#define AV_CPU_FLAG_MMI (1 << 0)
78#define AV_CPU_FLAG_MSA (1 << 1)
79
80//Loongarch SIMD extension.
81#define AV_CPU_FLAG_LSX (1 << 0)
82#define AV_CPU_FLAG_LASX (1 << 1)
83
84// RISC-V extensions
85#define AV_CPU_FLAG_RVI (1 << 0) ///< I (full GPR bank)
86#if FF_API_RISCV_FD_ZBA
87#define AV_CPU_FLAG_RVF (1 << 1) ///< F (single precision FP)
88#define AV_CPU_FLAG_RVD (1 << 2) ///< D (double precision FP)
89#endif
90#define AV_CPU_FLAG_RVV_I32 (1 << 3) ///< Vectors of 8/16/32-bit int's */
91#define AV_CPU_FLAG_RVV_F32 (1 << 4) ///< Vectors of float's */
92#define AV_CPU_FLAG_RVV_I64 (1 << 5) ///< Vectors of 64-bit int's */
93#define AV_CPU_FLAG_RVV_F64 (1 << 6) ///< Vectors of double's
94#define AV_CPU_FLAG_RVB_BASIC (1 << 7) ///< Basic bit-manipulations
95#if FF_API_RISCV_FD_ZBA
96#define AV_CPU_FLAG_RVB_ADDR (1 << 8) ///< Address bit-manipulations
97#endif
98#define AV_CPU_FLAG_RV_ZVBB (1 << 9) ///< Vector basic bit-manipulations
99#define AV_CPU_FLAG_RV_MISALIGNED (1 <<10) ///< Fast misaligned accesses
100#define AV_CPU_FLAG_RVB (1 <<11) ///< B (bit manipulations)
101
102/**
103 * Return the flags which specify extensions supported by the CPU.
104 * The returned value is affected by av_force_cpu_flags() if that was used
105 * before. So av_get_cpu_flags() can easily be used in an application to
106 * detect the enabled cpu flags.
107 */
109
110/**
111 * Disables cpu detection and forces the specified flags.
112 * -1 is a special case that disables forcing of specific flags.
113 */
114void av_force_cpu_flags(int flags);
115
116/**
117 * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
118 *
119 * @return negative on error.
120 */
121int av_parse_cpu_caps(unsigned *flags, const char *s);
122
123/**
124 * @return the number of logical CPU cores present.
125 */
126int av_cpu_count(void);
127
128/**
129 * Overrides cpu count detection and forces the specified count.
130 * Count < 1 disables forcing of specific count.
131 */
132void av_cpu_force_count(int count);
133
134/**
135 * Get the maximum data alignment that may be required by FFmpeg.
136 *
137 * Note that this is affected by the build configuration and the CPU flags mask,
138 * so e.g. if the CPU supports AVX, but libavutil has been built with
139 * --disable-avx or the AV_CPU_FLAG_AVX flag has been disabled through
140 * av_set_cpu_flags_mask(), then this function will behave as if AVX is not
141 * present.
142 */
143size_t av_cpu_max_align(void);
144
145#endif /* AVUTIL_CPU_H */
void av_force_cpu_flags(int flags)
Disables cpu detection and forces the specified flags.
size_t av_cpu_max_align(void)
Get the maximum data alignment that may be required by FFmpeg.
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.
void av_cpu_force_count(int count)
Overrides cpu count detection and forces the specified count.
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
int av_cpu_count(void)
swscale version macros