Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright (c) 2015 James Almer
  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_X86_INTMATH_H
  22. #define AVUTIL_X86_INTMATH_H
  23.  
  24. #include <stdint.h>
  25. #include "config.h"
  26.  
  27. #if defined(__GNUC__)
  28.  
  29. /* Our generic version of av_popcount is faster than GCC's built-in on
  30.  * CPUs that don't support the popcnt instruction.
  31.  */
  32. #if defined(__POPCNT__)
  33.     #define av_popcount   __builtin_popcount
  34. #if ARCH_X86_64
  35.     #define av_popcount64 __builtin_popcountll
  36. #endif
  37.  
  38. #endif /* __POPCNT__ */
  39.  
  40. #if defined(__BMI2__)
  41.  
  42. #if AV_GCC_VERSION_AT_LEAST(5,1)
  43. #define av_mod_uintp2 __builtin_ia32_bzhi_si
  44. #elif HAVE_INLINE_ASM
  45. /* GCC releases before 5.1.0 have a broken bzhi builtin, so for those we
  46.  * implement it using inline assembly
  47.  */
  48. #define av_mod_uintp2 av_mod_uintp2_bmi2
  49. static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p)
  50. {
  51.     if (av_builtin_constant_p(p))
  52.         return a & ((1 << p) - 1);
  53.     else {
  54.         unsigned x;
  55.         __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p));
  56.         return x;
  57.     }
  58. }
  59. #endif /* AV_GCC_VERSION_AT_LEAST */
  60.  
  61. #endif /* __BMI2__ */
  62.  
  63. #endif /* __GNUC__ */
  64.  
  65. #endif /* AVUTIL_X86_INTMATH_H */
  66.