FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
cpu.c
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <stdint.h>
20 #include <stdatomic.h>
21 
22 #include "cpu.h"
23 #include "cpu_internal.h"
24 #include "config.h"
25 #include "opt.h"
26 #include "common.h"
27 
28 #if HAVE_SCHED_GETAFFINITY
29 #ifndef _GNU_SOURCE
30 # define _GNU_SOURCE
31 #endif
32 #include <sched.h>
33 #endif
34 #if HAVE_GETPROCESSAFFINITYMASK || HAVE_WINRT
35 #include <windows.h>
36 #endif
37 #if HAVE_SYSCTL
38 #if HAVE_SYS_PARAM_H
39 #include <sys/param.h>
40 #endif
41 #include <sys/types.h>
42 #include <sys/sysctl.h>
43 #endif
44 #if HAVE_UNISTD_H
45 #include <unistd.h>
46 #endif
47 
49 
50 static int get_cpu_flags(void)
51 {
52  if (ARCH_AARCH64)
53  return ff_get_cpu_flags_aarch64();
54  if (ARCH_ARM)
55  return ff_get_cpu_flags_arm();
56  if (ARCH_PPC)
57  return ff_get_cpu_flags_ppc();
58  if (ARCH_X86)
59  return ff_get_cpu_flags_x86();
60  return 0;
61 }
62 
64  if (ARCH_X86 &&
65  (arg & ( AV_CPU_FLAG_3DNOW |
82  && !(arg & AV_CPU_FLAG_MMX)) {
83  av_log(NULL, AV_LOG_WARNING, "MMX implied by specified flags\n");
84  arg |= AV_CPU_FLAG_MMX;
85  }
86 
87  atomic_store_explicit(&cpu_flags, arg, memory_order_relaxed);
88 }
89 
91 {
92  int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);
93  if (flags == -1) {
94  flags = get_cpu_flags();
95  atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);
96  }
97  return flags;
98 }
99 
101 {
103  memory_order_relaxed);
104 }
105 
106 int av_parse_cpu_flags(const char *s)
107 {
108 #define CPUFLAG_MMXEXT (AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT | AV_CPU_FLAG_CMOV)
109 #define CPUFLAG_3DNOW (AV_CPU_FLAG_3DNOW | AV_CPU_FLAG_MMX)
110 #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)
111 #define CPUFLAG_SSE (AV_CPU_FLAG_SSE | CPUFLAG_MMXEXT)
112 #define CPUFLAG_SSE2 (AV_CPU_FLAG_SSE2 | CPUFLAG_SSE)
113 #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)
114 #define CPUFLAG_SSE3 (AV_CPU_FLAG_SSE3 | CPUFLAG_SSE2)
115 #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)
116 #define CPUFLAG_SSSE3 (AV_CPU_FLAG_SSSE3 | CPUFLAG_SSE3)
117 #define CPUFLAG_SSE4 (AV_CPU_FLAG_SSE4 | CPUFLAG_SSSE3)
118 #define CPUFLAG_SSE42 (AV_CPU_FLAG_SSE42 | CPUFLAG_SSE4)
119 #define CPUFLAG_AVX (AV_CPU_FLAG_AVX | CPUFLAG_SSE42)
120 #define CPUFLAG_AVXSLOW (AV_CPU_FLAG_AVXSLOW | CPUFLAG_AVX)
121 #define CPUFLAG_XOP (AV_CPU_FLAG_XOP | CPUFLAG_AVX)
122 #define CPUFLAG_FMA3 (AV_CPU_FLAG_FMA3 | CPUFLAG_AVX)
123 #define CPUFLAG_FMA4 (AV_CPU_FLAG_FMA4 | CPUFLAG_AVX)
124 #define CPUFLAG_AVX2 (AV_CPU_FLAG_AVX2 | CPUFLAG_AVX)
125 #define CPUFLAG_BMI2 (AV_CPU_FLAG_BMI2 | AV_CPU_FLAG_BMI1)
126 #define CPUFLAG_AESNI (AV_CPU_FLAG_AESNI | CPUFLAG_SSE42)
127  static const AVOption cpuflags_opts[] = {
128  { "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
129 #if ARCH_PPC
130  { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
131 #elif ARCH_X86
132  { "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
133  { "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_MMXEXT }, .unit = "flags" },
134  { "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE }, .unit = "flags" },
135  { "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2 }, .unit = "flags" },
136  { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2SLOW }, .unit = "flags" },
137  { "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3 }, .unit = "flags" },
138  { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3SLOW }, .unit = "flags" },
139  { "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSSE3 }, .unit = "flags" },
140  { "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
141  { "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE4 }, .unit = "flags" },
142  { "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE42 }, .unit = "flags" },
143  { "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX }, .unit = "flags" },
144  { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVXSLOW }, .unit = "flags" },
145  { "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_XOP }, .unit = "flags" },
146  { "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3 }, .unit = "flags" },
147  { "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4 }, .unit = "flags" },
148  { "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2 }, .unit = "flags" },
149  { "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
150  { "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2 }, .unit = "flags" },
151  { "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW }, .unit = "flags" },
152  { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT }, .unit = "flags" },
153  { "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
154  { "aesni" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AESNI }, .unit = "flags" },
155 #elif ARCH_ARM
156  { "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
157  { "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
158  { "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
159  { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
160  { "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
161  { "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
162  { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
163 #elif ARCH_AARCH64
164  { "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
165  { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
166  { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
167 #endif
168  { NULL },
169  };
170  static const AVClass class = {
171  .class_name = "cpuflags",
172  .item_name = av_default_item_name,
173  .option = cpuflags_opts,
174  .version = LIBAVUTIL_VERSION_INT,
175  };
176 
177  int flags = 0, ret;
178  const AVClass *pclass = &class;
179 
180  if ((ret = av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, &flags)) < 0)
181  return ret;
182 
183  return flags & INT_MAX;
184 }
185 
186 int av_parse_cpu_caps(unsigned *flags, const char *s)
187 {
188  static const AVOption cpuflags_opts[] = {
189  { "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
190 #if ARCH_PPC
191  { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
192 #elif ARCH_X86
193  { "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
194  { "mmx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
195  { "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
196  { "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE }, .unit = "flags" },
197  { "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2 }, .unit = "flags" },
198  { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2SLOW }, .unit = "flags" },
199  { "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3 }, .unit = "flags" },
200  { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3SLOW }, .unit = "flags" },
201  { "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSSE3 }, .unit = "flags" },
202  { "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
203  { "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE4 }, .unit = "flags" },
204  { "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE42 }, .unit = "flags" },
205  { "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX }, .unit = "flags" },
206  { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVXSLOW }, .unit = "flags" },
207  { "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_XOP }, .unit = "flags" },
208  { "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA3 }, .unit = "flags" },
209  { "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA4 }, .unit = "flags" },
210  { "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX2 }, .unit = "flags" },
211  { "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
212  { "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI2 }, .unit = "flags" },
213  { "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW }, .unit = "flags" },
214  { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT }, .unit = "flags" },
215  { "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
216  { "aesni", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AESNI }, .unit = "flags" },
217 
218 #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX
219 #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE
220 #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2
221  { "pentium2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P2 }, .unit = "flags" },
222  { "pentium3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P3 }, .unit = "flags" },
223  { "pentium4", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P4 }, .unit = "flags" },
224 
225 #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW
226 #define CPU_FLAG_ATHLON CPU_FLAG_K62 | AV_CPU_FLAG_CMOV | AV_CPU_FLAG_3DNOWEXT | AV_CPU_FLAG_MMX2
227 #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE
228 #define CPU_FLAG_K8 CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2
229  { "k6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
230  { "k62", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K62 }, .unit = "flags" },
231  { "athlon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLON }, .unit = "flags" },
232  { "athlonxp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLONXP }, .unit = "flags" },
233  { "k8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K8 }, .unit = "flags" },
234 #elif ARCH_ARM
235  { "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
236  { "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
237  { "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
238  { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
239  { "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
240  { "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
241  { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
242  { "setend", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SETEND }, .unit = "flags" },
243 #elif ARCH_AARCH64
244  { "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
245  { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
246  { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
247 #endif
248  { NULL },
249  };
250  static const AVClass class = {
251  .class_name = "cpuflags",
252  .item_name = av_default_item_name,
253  .option = cpuflags_opts,
254  .version = LIBAVUTIL_VERSION_INT,
255  };
256  const AVClass *pclass = &class;
257 
258  return av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, flags);
259 }
260 
261 int av_cpu_count(void)
262 {
263  static volatile int printed;
264 
265  int nb_cpus = 1;
266 #if HAVE_WINRT
267  SYSTEM_INFO sysinfo;
268 #endif
269 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
270  cpu_set_t cpuset;
271 
272  CPU_ZERO(&cpuset);
273 
274  if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
275  nb_cpus = CPU_COUNT(&cpuset);
276 #elif HAVE_GETPROCESSAFFINITYMASK
277  DWORD_PTR proc_aff, sys_aff;
278  if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
279  nb_cpus = av_popcount64(proc_aff);
280 #elif HAVE_SYSCTL && defined(HW_NCPU)
281  int mib[2] = { CTL_HW, HW_NCPU };
282  size_t len = sizeof(nb_cpus);
283 
284  if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
285  nb_cpus = 0;
286 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
287  nb_cpus = sysconf(_SC_NPROC_ONLN);
288 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
289  nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
290 #elif HAVE_WINRT
291  GetNativeSystemInfo(&sysinfo);
292  nb_cpus = sysinfo.dwNumberOfProcessors;
293 #endif
294 
295  if (!printed) {
296  av_log(NULL, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
297  printed = 1;
298  }
299 
300  return nb_cpus;
301 }
#define CPUFLAG_3DNOW
#define AV_CPU_FLAG_AVX
AVX functions: requires OS support even if YMM registers aren't used.
Definition: cpu.h:47
#define ATOMIC_VAR_INIT(value)
Definition: stdatomic.h:31
#define NULL
Definition: coverity.c:32
#define AV_CPU_FLAG_ALTIVEC
standard
Definition: cpu.h:57
const char * s
Definition: avisynth_c.h:768
AVOption.
Definition: opt.h:246
int av_cpu_count(void)
Definition: cpu.c:261
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:86
#define AV_CPU_FLAG_SSE
SSE functions.
Definition: cpu.h:33
#define CPUFLAG_SSE3
void av_set_cpu_flags_mask(int mask)
Set a mask on flags returned by av_get_cpu_flags().
Definition: cpu.c:100
#define AV_CPU_FLAG_MMX2
SSE integer functions or AMD MMX ext.
Definition: cpu.h:31
#define CPUFLAG_SSE4
#define AV_CPU_FLAG_CMOV
supports cmov instruction
Definition: cpu.h:51
#define AV_CPU_FLAG_VFP
Definition: cpu.h:64
static atomic_int cpu_flags
Definition: cpu.c:48
intptr_t atomic_int
Definition: stdatomic.h:55
#define CPUFLAG_AESNI
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
AVOptions.
#define CPUFLAG_SSE3SLOW
#define AV_CPU_FLAG_FMA3
Haswell FMA3 functions.
Definition: cpu.h:53
#define AV_CPU_FLAG_NEON
Definition: cpu.h:66
#define AV_CPU_FLAG_MMXEXT
SSE integer functions or AMD MMX ext.
Definition: cpu.h:30
int ff_get_cpu_flags_ppc(void)
This function MAY rely on signal() or fork() in order to make sure AltiVec is present.
Definition: cpu.c:48
int av_parse_cpu_flags(const char *s)
Parse CPU flags from a string.
Definition: cpu.c:106
#define AV_CPU_FLAG_ATOM
Atom processor, some SSSE3 instructions are slower.
Definition: cpu.h:43
static int flags
Definition: log.c:57
#define AV_CPU_FLAG_AVX2
AVX2 functions: requires OS support even if YMM registers aren't used.
Definition: cpu.h:52
#define AV_CPU_FLAG_SSE2SLOW
SSE2 supported, but usually not faster.
Definition: cpu.h:35
#define AV_CPU_FLAG_XOP
Bulldozer XOP functions.
Definition: cpu.h:49
#define av_log(a,...)
#define AV_CPU_FLAG_SSE42
Nehalem SSE4.2 functions.
Definition: cpu.h:45
#define AV_CPU_FLAG_SSSE3
Conroe SSSE3 functions.
Definition: cpu.h:41
static const uint16_t mask[17]
Definition: lzw.c:38
av_default_item_name
int av_opt_eval_flags(void *obj, const AVOption *o, const char *val, int *flags_out)
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
const char * arg
Definition: jacosubdec.c:66
#define AV_CPU_FLAG_ARMV6T2
Definition: cpu.h:63
#define AV_CPU_FLAG_VFP_VM
VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations.
Definition: cpu.h:68
#define CPUFLAG_SSE
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:186
#define AV_CPU_FLAG_ARMV5TE
Definition: cpu.h:61
#define CPUFLAG_SSE2
#define AV_CPU_FLAG_SSE3
Prescott SSE3 functions.
Definition: cpu.h:38
int ff_get_cpu_flags_x86(void)
Definition: cpu.c:90
#define atomic_load_explicit(object, order)
Definition: stdatomic.h:96
#define AV_CPU_FLAG_BMI2
Bit Manipulation Instruction Set 2.
Definition: cpu.h:55
#define AV_CPU_FLAG_VFPV3
Definition: cpu.h:65
#define CPUFLAG_BMI2
#define AV_CPU_FLAG_3DNOW
AMD 3DNOW.
Definition: cpu.h:32
#define AV_CPU_FLAG_ARMV6
Definition: cpu.h:62
int ff_get_cpu_flags_aarch64(void)
Definition: cpu.c:23
#define AV_CPU_FLAG_SSE3SLOW
SSE3 supported, but usually not faster.
Definition: cpu.h:39
#define AV_CPU_FLAG_AVXSLOW
AVX supported, but slow when using YMM registers (e.g. Bulldozer)
Definition: cpu.h:48
#define CPUFLAG_FMA4
#define AV_CPU_FLAG_BMI1
Bit Manipulation Instruction Set 1.
Definition: cpu.h:54
#define AV_CPU_FLAG_MMX
standard MMX
Definition: cpu.h:29
#define CPUFLAG_FMA3
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AV_CPU_FLAG_FMA4
Bulldozer FMA4 functions.
Definition: cpu.h:50
#define AV_CPU_FLAG_SSE4
Penryn SSE4.1 functions.
Definition: cpu.h:44
#define CPUFLAG_AVXSLOW
#define AV_CPU_FLAG_AESNI
Advanced Encryption Standard functions.
Definition: cpu.h:46
#define atomic_store_explicit(object, desired, order)
Definition: stdatomic.h:90
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:90
#define CPUFLAG_SSE2SLOW
#define CPUFLAG_XOP
#define AV_CPU_FLAG_3DNOWEXT
AMD 3DNowExt.
Definition: cpu.h:37
common internal and external API header
#define AV_CPU_FLAG_ARMV8
Definition: cpu.h:67
#define CPUFLAG_AVX2
int len
DWORD * DWORD_PTR
int ff_get_cpu_flags_arm(void)
Definition: cpu.c:149
#define AV_CPU_FLAG_SETEND
Definition: cpu.h:69
static int get_cpu_flags(void)
Definition: cpu.c:50
#define AV_CPU_FLAG_SSE2
PIV SSE2 functions.
Definition: cpu.h:34
#define CPUFLAG_3DNOWEXT
void av_force_cpu_flags(int arg)
Disables cpu detection and forces the specified flags.
Definition: cpu.c:63
#define CPUFLAG_MMXEXT
#define CPUFLAG_AVX
#define CPUFLAG_SSE42
#define CPUFLAG_SSSE3