cpu.h 5.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129
  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 <stddef.h>
  23. #include "attributes.h"
  24. #define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
  25. /* lower 16 bits - CPU features */
  26. #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
  27. #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
  28. #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
  29. #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
  30. #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
  31. #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
  32. #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
  33. ///< than regular MMX/SSE (e.g. Core1)
  34. #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
  35. #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
  36. #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
  37. ///< than regular MMX/SSE (e.g. Core1)
  38. #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
  39. #define AV_CPU_FLAG_SSSE3SLOW 0x4000000 ///< SSSE3 supported, but usually not faster
  40. #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
  41. #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
  42. #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
  43. #define AV_CPU_FLAG_AESNI 0x80000 ///< Advanced Encryption Standard functions
  44. #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
  45. #define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
  46. #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
  47. #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
  48. #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
  49. #define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
  50. #define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
  51. #define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
  52. #define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
  53. #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
  54. #define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06
  55. #define AV_CPU_FLAG_POWER8 0x0004 ///< ISA 2.07
  56. #define AV_CPU_FLAG_ARMV5TE (1 << 0)
  57. #define AV_CPU_FLAG_ARMV6 (1 << 1)
  58. #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
  59. #define AV_CPU_FLAG_VFP (1 << 3)
  60. #define AV_CPU_FLAG_VFPV3 (1 << 4)
  61. #define AV_CPU_FLAG_NEON (1 << 5)
  62. #define AV_CPU_FLAG_ARMV8 (1 << 6)
  63. #define AV_CPU_FLAG_VFP_VM (1 << 7) ///< VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations
  64. #define AV_CPU_FLAG_SETEND (1 <<16)
  65. /**
  66. * Return the flags which specify extensions supported by the CPU.
  67. * The returned value is affected by av_force_cpu_flags() if that was used
  68. * before. So av_get_cpu_flags() can easily be used in an application to
  69. * detect the enabled cpu flags.
  70. */
  71. int av_get_cpu_flags(void);
  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. * Set a mask on flags returned by av_get_cpu_flags().
  79. * This function is mainly useful for testing.
  80. * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
  81. */
  82. attribute_deprecated void av_set_cpu_flags_mask(int mask);
  83. /**
  84. * Parse CPU flags from a string.
  85. *
  86. * The returned flags contain the specified flags as well as related unspecified flags.
  87. *
  88. * This function exists only for compatibility with libav.
  89. * Please use av_parse_cpu_caps() when possible.
  90. * @return a combination of AV_CPU_* flags, negative on error.
  91. */
  92. attribute_deprecated
  93. int av_parse_cpu_flags(const char *s);
  94. /**
  95. * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
  96. *
  97. * @return negative on error.
  98. */
  99. int av_parse_cpu_caps(unsigned *flags, const char *s);
  100. /**
  101. * @return the number of logical CPU cores present.
  102. */
  103. int av_cpu_count(void);
  104. /**
  105. * Get the maximum data alignment that may be required by FFmpeg.
  106. *
  107. * Note that this is affected by the build configuration and the CPU flags mask,
  108. * so e.g. if the CPU supports AVX, but libavutil has been built with
  109. * --disable-avx or the AV_CPU_FLAG_AVX flag has been disabled through
  110. * av_set_cpu_flags_mask(), then this function will behave as if AVX is not
  111. * present.
  112. */
  113. size_t av_cpu_max_align(void);
  114. #endif /* AVUTIL_CPU_H */