cpu.h 4.2 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. #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
  33. #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
  34. #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
  35. #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
  36. #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
  37. #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
  38. #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
  39. #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
  40. #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
  41. #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
  42. // #if LIBAVUTIL_VERSION_MAJOR <52
  43. #define AV_CPU_FLAG_CMOV 0x1001000 ///< supports cmov instruction
  44. // #else
  45. // #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
  46. // #endif
  47. #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
  48. #define AV_CPU_FLAG_ARMV5TE (1 << 0)
  49. #define AV_CPU_FLAG_ARMV6 (1 << 1)
  50. #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
  51. #define AV_CPU_FLAG_VFP (1 << 3)
  52. #define AV_CPU_FLAG_VFPV3 (1 << 4)
  53. #define AV_CPU_FLAG_NEON (1 << 5)
  54. /**
  55. * Return the flags which specify extensions supported by the CPU.
  56. * The returned value is affected by av_force_cpu_flags() if that was used
  57. * before. So av_get_cpu_flags() can easily be used in a application to
  58. * detect the enabled cpu flags.
  59. */
  60. int av_get_cpu_flags(void);
  61. /**
  62. * Disables cpu detection and forces the specified flags.
  63. * -1 is a special case that disables forcing of specific flags.
  64. */
  65. void av_force_cpu_flags(int flags);
  66. /**
  67. * Set a mask on flags returned by av_get_cpu_flags().
  68. * This function is mainly useful for testing.
  69. * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
  70. *
  71. * @warning this function is not thread safe.
  72. */
  73. attribute_deprecated void av_set_cpu_flags_mask(int mask);
  74. /**
  75. * Parse CPU flags from a string.
  76. *
  77. * The returned flags contain the specified flags as well as related unspecified flags.
  78. *
  79. * This function exists only for compatibility with libav.
  80. * Please use av_parse_cpu_caps() when possible.
  81. * @return a combination of AV_CPU_* flags, negative on error.
  82. */
  83. attribute_deprecated
  84. int av_parse_cpu_flags(const char *s);
  85. /**
  86. * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
  87. *
  88. * @return negative on error.
  89. */
  90. int av_parse_cpu_caps(unsigned *flags, const char *s);
  91. /* The following CPU-specific functions shall not be called directly. */
  92. int ff_get_cpu_flags_arm(void);
  93. int ff_get_cpu_flags_ppc(void);
  94. int ff_get_cpu_flags_x86(void);
  95. #endif /* AVUTIL_CPU_H */