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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 "attributes.h"
  25.  
  26. #define AV_CPU_FLAG_FORCE    0x80000000 /* force usage of selected flags (OR) */
  27.  
  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_XOP          0x0400 ///< Bulldozer XOP functions
  47. #define AV_CPU_FLAG_FMA4         0x0800 ///< Bulldozer FMA4 functions
  48. // #if LIBAVUTIL_VERSION_MAJOR <52
  49. #define AV_CPU_FLAG_CMOV      0x1001000 ///< supports cmov instruction
  50. // #else
  51. // #define AV_CPU_FLAG_CMOV         0x1000 ///< supports cmov instruction
  52. // #endif
  53. #define AV_CPU_FLAG_AVX2         0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
  54.  
  55. #define AV_CPU_FLAG_ALTIVEC      0x0001 ///< standard
  56.  
  57. #define AV_CPU_FLAG_ARMV5TE      (1 << 0)
  58. #define AV_CPU_FLAG_ARMV6        (1 << 1)
  59. #define AV_CPU_FLAG_ARMV6T2      (1 << 2)
  60. #define AV_CPU_FLAG_VFP          (1 << 3)
  61. #define AV_CPU_FLAG_VFPV3        (1 << 4)
  62. #define AV_CPU_FLAG_NEON         (1 << 5)
  63.  
  64. /**
  65.  * Return the flags which specify extensions supported by the CPU.
  66.  * The returned value is affected by av_force_cpu_flags() if that was used
  67.  * before. So av_get_cpu_flags() can easily be used in a application to
  68.  * detect the enabled cpu flags.
  69.  */
  70. int av_get_cpu_flags(void);
  71.  
  72. /**
  73.  * Disables cpu detection and forces the specified flags.
  74.  * -1 is a special case that disables forcing of specific flags.
  75.  */
  76. void av_force_cpu_flags(int flags);
  77.  
  78. /**
  79.  * Set a mask on flags returned by av_get_cpu_flags().
  80.  * This function is mainly useful for testing.
  81.  * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
  82.  *
  83.  * @warning this function is not thread safe.
  84.  */
  85. attribute_deprecated void av_set_cpu_flags_mask(int mask);
  86.  
  87. /**
  88.  * Parse CPU flags from a string.
  89.  *
  90.  * The returned flags contain the specified flags as well as related unspecified flags.
  91.  *
  92.  * This function exists only for compatibility with libav.
  93.  * Please use av_parse_cpu_caps() when possible.
  94.  * @return a combination of AV_CPU_* flags, negative on error.
  95.  */
  96. attribute_deprecated
  97. int av_parse_cpu_flags(const char *s);
  98.  
  99. /**
  100.  * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
  101.  *
  102.  * @return negative on error.
  103.  */
  104. int av_parse_cpu_caps(unsigned *flags, const char *s);
  105.  
  106. /**
  107.  * @return the number of logical CPU cores present.
  108.  */
  109. int av_cpu_count(void);
  110.  
  111. #endif /* AVUTIL_CPU_H */
  112.