时间开销模型源码

#include "stdafx.h"
#include "time.h"
#include <iostream>
using namespace std;

#define trails 5
#define n 10000
#define M(op) \
    cout << #op;     cout << "\t";     timesum = 0;     for(int tr=0;tr<trails;++tr)     {         start = clock();         for(int i=1;i<=n;++i)            for(int j=1;j<=n;++j)               op;         t = clock() - start;         cout << t;         cout << "\t";         timesum += t;     }     cout << 1e9 * timesum / (n*n*trails * CLOCKS_PER_SEC);     cout << "\n";


int main()
{    
    int k = 0;
    int timesum = 0;
    int start = 0;
    int t = 0;

    M({});
    M(k++);
    M(k=i+j);
    M(k=i-j);
    M(k=i*j);
    M(k=i/j);
    M(k=i%j);
    M(k=i&j);
    M(k=i|j);

    M(k=sqrt(i));

    return 0;
}

{}      224     222     222     222     221     622.83
k++     237     236     237     237     237     663.754
k=i+j   195     194     195     194     194     544.906
k=i-j   195     195     198     197     195     549.391
k=i*j   202     202     202     202     202     566.209
k=i/j   397     397     398     396     396     1112.24
k=i%j   401     397     396     399     396     1115.04
k=i&j   195     194     195     197     194     546.588
k=i|j   194     195     193     195     194     544.345
k=sqrt(i)       3177    3181    3177    3171    3173    8901.81