[Mingw-users] libstdc++ vs stlport

[Cristian A. <ac...@po...>]

Hi all

Take this little program:

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

int main()
{
    string str = "0123456789abc";
   
    unsigned long start = GetTickCount();
    for (int i = 0; i < 10000000; ++i)
    {
        str.find("abc");
    }
    unsigned long stop = GetTickCount();
    cout << (stop - start) / 1000.0 << endl;
}

I've compiled it with gcc 3.2's libstdc++ and with stlport 5.0
both with -O3 switch, and here the results:
libstdc++:
5.75s, 5.75s, 5.75s
stlport:
0.843s, 0.859s, 0.844s

With: strstr(str.c_str(), "abc")  took only:
0.484s, 0.469s, 0.484s

I don't know why the libstdc++ find is 6.8 times slower than
stlport find!

Cheers,
Cristi.