Re: how could "atof" be so slow in vc2005?

i'm using visual studio 2005, and compile the code in release mode

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

int main()
{
    int i = 0;
    double sum = 0.0;
    clock_t start = clock();

    for (i=0; i<10000000; i++)
    {
        sum += atof("1.123400e01");
    }
    cout << "time: " << double(clock() - start) / CLOCKS_PER_SEC <<
"\tresult: " << sum << endl;

    return 0;
}

the code runs more than 7.0 seconds on my Intel Xeon 3.0 box.
meanwhile, the same code runs less than 2.0 seconds on a AMD Athlon
2000+ box which runs freebsd 6.1 and gcc 3.4.4