src/bench/perf.h

   1 // Copyright (c) 2016 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 /** Functions for measurement of CPU cycles */
   6 #ifndef H_PERF
   7 #define H_PERF
   8
   9 #include <stdint.h>
  10
  11 #if defined(__i386__)
  12
  13 static inline uint64_t perf_cpucycles(void)
  14 {
  15     uint64_t x;
  16     __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
  17     return x;
  18 }
  19
  20 #elif defined(__x86_64__)
  21
  22 static inline uint64_t perf_cpucycles(void)
  23 {
  24     uint32_t hi, lo;
  25     __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
  26     return ((uint64_t)lo)|(((uint64_t)hi)<<32);
  27 }
  28 #else
  29
  30 uint64_t perf_cpucycles(void);
  31
  32 #endif
  33
  34 void perf_init(void);
  35 void perf_fini(void);
  36
  37 #endif // H_PERF