gitee.com/liu-zhao234568/cntest@v1.0.0/crypto/secp256k1/libsecp256k1/src/bench.h (about)

     1  /**********************************************************************
     2   * Copyright (c) 2014 Pieter Wuille                                   *
     3   * Distributed under the MIT software license, see the accompanying   *
     4   * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
     5   **********************************************************************/
     6  
     7  #ifndef _SECP256K1_BENCH_H_
     8  #define _SECP256K1_BENCH_H_
     9  
    10  #include <stdio.h>
    11  #include <math.h>
    12  #include "sys/time.h"
    13  
    14  static double gettimedouble(void) {
    15      struct timeval tv;
    16      gettimeofday(&tv, NULL);
    17      return tv.tv_usec * 0.000001 + tv.tv_sec;
    18  }
    19  
    20  void print_number(double x) {
    21      double y = x;
    22      int c = 0;
    23      if (y < 0.0) {
    24          y = -y;
    25      }
    26      while (y < 100.0) {
    27          y *= 10.0;
    28          c++;
    29      }
    30      printf("%.*f", c, x);
    31  }
    32  
    33  void run_benchmark(char *name, void (*benchmark)(void*), void (*setup)(void*), void (*teardown)(void*), void* data, int count, int iter) {
    34      int i;
    35      double min = HUGE_VAL;
    36      double sum = 0.0;
    37      double max = 0.0;
    38      for (i = 0; i < count; i++) {
    39          double begin, total;
    40          if (setup != NULL) {
    41              setup(data);
    42          }
    43          begin = gettimedouble();
    44          benchmark(data);
    45          total = gettimedouble() - begin;
    46          if (teardown != NULL) {
    47              teardown(data);
    48          }
    49          if (total < min) {
    50              min = total;
    51          }
    52          if (total > max) {
    53              max = total;
    54          }
    55          sum += total;
    56      }
    57      printf("%s: min ", name);
    58      print_number(min * 1000000.0 / iter);
    59      printf("us / avg ");
    60      print_number((sum / count) * 1000000.0 / iter);
    61      printf("us / max ");
    62      print_number(max * 1000000.0 / iter);
    63      printf("us\n");
    64  }
    65  
    66  #endif