991216-4.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Test against a problem with loop reversal.  */
static void bug(int size, int tries)
{
    int i;
    int num = 0;
    while (num < size)
    {
        for (i = 1; i < tries; i++) num++;
    }
}

int main()
{
    bug(5, 10);
    exit (0);
}