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  1. /*
  2.  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  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_TIMER_H
  22. #define AVUTIL_X86_TIMER_H
  23.  
  24. #include <stdint.h>
  25.  
  26. #if HAVE_INLINE_ASM
  27.  
  28. #define FF_TIMER_UNITS "decicycles"
  29. #define AV_READ_TIME read_time
  30.  
  31. static inline uint64_t read_time(void)
  32. {
  33.     uint32_t a, d;
  34.     __asm__ volatile(
  35. #if ARCH_X86_64 || defined(__SSE2__)
  36.                      "lfence \n\t"
  37. #endif
  38.                      "rdtsc  \n\t"
  39.                      : "=a" (a), "=d" (d));
  40.     return ((uint64_t)d << 32) + a;
  41. }
  42.  
  43. #elif HAVE_RDTSC
  44.  
  45. #include <intrin.h>
  46. #define AV_READ_TIME __rdtsc
  47.  
  48. #endif /* HAVE_INLINE_ASM */
  49.  
  50. #endif /* AVUTIL_X86_TIMER_H */
  51.