cpu.h 4.4 KB

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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. #ifndef AVUTIL_CPU_H
  21. #define AVUTIL_CPU_H
  22. #include "attributes.h"
  23. #define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
  24. /* lower 16 bits - CPU features */
  25. #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
  26. #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
  27. #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
  28. #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
  29. #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
  30. #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
  31. #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
  32. ///< than regular MMX/SSE (e.g. Core1)
  33. #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
  34. #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
  35. #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
  36. ///< than regular MMX/SSE (e.g. Core1)
  37. #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
  38. #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
  39. #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
  40. #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
  41. #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
  42. #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
  43. #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
  44. // #if LIBAVUTIL_VERSION_MAJOR <52
  45. #define AV_CPU_FLAG_CMOV 0x1001000 ///< supports cmov instruction
  46. // #else
  47. // #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
  48. // #endif
  49. #define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
  50. #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
  51. #define AV_CPU_FLAG_ARMV5TE (1 << 0)
  52. #define AV_CPU_FLAG_ARMV6 (1 << 1)
  53. #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
  54. #define AV_CPU_FLAG_VFP (1 << 3)
  55. #define AV_CPU_FLAG_VFPV3 (1 << 4)
  56. #define AV_CPU_FLAG_NEON (1 << 5)
  57. /**
  58. * Return the flags which specify extensions supported by the CPU.
  59. * The returned value is affected by av_force_cpu_flags() if that was used
  60. * before. So av_get_cpu_flags() can easily be used in a application to
  61. * detect the enabled cpu flags.
  62. */
  63. int av_get_cpu_flags(void);
  64. /**
  65. * Disables cpu detection and forces the specified flags.
  66. * -1 is a special case that disables forcing of specific flags.
  67. */
  68. void av_force_cpu_flags(int flags);
  69. /**
  70. * Set a mask on flags returned by av_get_cpu_flags().
  71. * This function is mainly useful for testing.
  72. * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
  73. *
  74. * @warning this function is not thread safe.
  75. */
  76. attribute_deprecated void av_set_cpu_flags_mask(int mask);
  77. /**
  78. * Parse CPU flags from a string.
  79. *
  80. * The returned flags contain the specified flags as well as related unspecified flags.
  81. *
  82. * This function exists only for compatibility with libav.
  83. * Please use av_parse_cpu_caps() when possible.
  84. * @return a combination of AV_CPU_* flags, negative on error.
  85. */
  86. attribute_deprecated
  87. int av_parse_cpu_flags(const char *s);
  88. /**
  89. * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
  90. *
  91. * @return negative on error.
  92. */
  93. int av_parse_cpu_caps(unsigned *flags, const char *s);
  94. /**
  95. * @return the number of logical CPU cores present.
  96. */
  97. int av_cpu_count(void);
  98. #endif /* AVUTIL_CPU_H */