text: // Copyright (c) 2016 The Pershyancoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  /** Functions for measurement of CPU cycles */
  #ifndef H_PERF
  #define H_PERF
  
  #include <stdint.h>
  
  #if defined(__i386__)
  
  static inline uint64_t perf_cpucycles(void)
  {
      uint64_t x;
      __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
      return x;
  }
  
  #elif defined(__x86_64__)
  
  static inline uint64_t perf_cpucycles(void)
  {
      uint32_t hi, lo;
      __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
      return ((uint64_t)lo)|(((uint64_t)hi)<<32);
  }
  #else
  
  uint64_t perf_cpucycles(void);
  
  #endif
  
  void perf_init(void);
  void perf_fini(void);
  
  #endif // H_PERF
  