A test program for vector extension in gcc. The sse version is not correct, just for testing

test_sse.cpp

#include <iostream>
#include <algorithm>

using namespace std;

void int_to_str(unsigned int num, char* buffer, unsigned int size)
{
    static const char* digits = "0123456789";
    char* buf_ptr = buffer;
    do
    {
        *(buf_ptr++) = digits[num % 10];
        num /= 10;
    } while (num > 0);
    *buf_ptr = '\0';
    reverse(buffer, buf_ptr);
}

typedef unsigned int v4ui __attribute__ ((vector_size (16)));
void int_to_str_sse(unsigned int num, char* buffer, unsigned int size)
{
    static const char* digits = "0123456789";
    char* buf_ptr = buffer;
    v4ui a, b = {1, 10, 100, 1000}, c;
    do
    {
        a[0] = num, a[1] = num, a[2] = num, a[3] = num;
        c = (a / b) % 10;
        *(buf_ptr++) = digits[c[0]];
        *(buf_ptr++) = digits[c[1]];
        *(buf_ptr++) = digits[c[2]];
        *(buf_ptr++) = digits[c[3]];
        num /= 10000;
    } while (num > 0);
    *buf_ptr = '\0';
    reverse(buffer, buf_ptr);
}

int main(int argc, char** argv)
{
    cout << "sizeof(int) " << sizeof(unsigned int) << endl;
    int times = 100000;
    int which = 1;
    unsigned int num = 12345678;
    if (argc > 1)
    {
        times = atoi(argv[1]);
    }
    if (argc > 2)
    {
        which = atoi(argv[2]);
    }
    if (argc > 3)
    {
        num = atoi(argv[3]);
    }

    char buffer[1024] = "";
    char buffer1[1024] = "";

    switch (which)
    {
    case 1:
        for (int i = 0; i < times; ++i)
        {
            int_to_str(num, buffer, 1024);
        }
        cout << "result: " << buffer << endl;
        break;
    case 2:
        for (int i = 0; i < times; ++i)
        {
            int_to_str_sse(num, buffer1, 1024);
        }
        cout << "result: " << buffer1 << endl;
        break;
    default:
        break;
    }

    return 0;
}