#include <sys/time.h>
#include <byteswap.h> 
#include <stdio.h> 

typedef unsigned int uint32_t;

#define UINT32_GLIBC_SWAP(x) ((uint32_t) bswap_32((uint32_t) x)) 
#define UINT32_GCC_SWAP(x) ((uint32_t) __builtin_bswap32((uint32_t) x)) 
#define UINT32_SWAP(x) ( (uint32_t) ( ((uint32_t) x >> 24) | ((uint32_t) x << 24) | (((uint32_t) x & 0xFF00) << 8) | ((((uint32_t) x) >> 8) & 0xFF00) ) ) 
#define UINT32_CAIRO_SWAP(x) (((x & 0x000000ff) << 24) | \
                  ((x & 0x0000ff00) << 8) | \
                  ((x & 0x00ff0000) >> 8) | \
                  ((x)              >> 24))

static void
swap_4bytes1 (uint32_t *ximage, int len)
{   
    int i, j;
    uint32_t *p = ximage;

    for (i = 0; i < len; i++) {
        *p = UINT32_CAIRO_SWAP (*p);
            p++;
    }
}

static void
swap_4bytes2 (uint32_t *ximage, int len)
{   
    int i, j;
    uint32_t *p = ximage;

    for (i = 0; i < len; i++) {
            *p = UINT32_SWAP (*p);
            p++;
    }
}

static void
swap_4bytes3 (uint32_t *ximage, int len)
{   
    int i, j;
    uint32_t *p = ximage;

    for (i = 0; i < len; i++) {
            *p = UINT32_GLIBC_SWAP (*p);
            p++;
    }
}

static void
swap_4bytes4 (uint32_t *ximage, int len)
{   
    int i, j;
    uint32_t *p = ximage;

    for (i = 0; i < len; i++) {
            *p = UINT32_GCC_SWAP (*p);
            p++;
    }
}

void
display (struct timeval *start, struct timeval *stop)
{
   printf ("time spent: %d\n",
           (stop->tv_sec-start->tv_sec)*1000 +
           (stop->tv_usec-start->tv_usec)/1000);
}

main ()
{
#define LEN 65535
    uint32_t image [LEN];
    int i;
    struct timeval start, stop;
    
    printf ("UINT32_GCC_SWAP\n");
    gettimeofday (&start, NULL);
    for (i = 0; i < 16000; i++)
      swap_4bytes4 (image, LEN);
    gettimeofday (&stop, NULL);
    display (&start, &stop);

    printf ("cairo code\n");
    gettimeofday (&start, NULL);
    for (i = 0; i < 16000; i++)
      swap_4bytes1 (image, LEN);
    gettimeofday (&stop, NULL);
    display (&start, &stop);

    printf ("UINT32_SWAP\n");
    gettimeofday (&start, NULL);
    for (i = 0; i < 16000; i++)
      swap_4bytes2 (image, LEN);
    gettimeofday (&stop, NULL);
    display (&start, &stop);

    printf ("UINT32_GLIBC_SWAP\n");
    gettimeofday (&start, NULL);
    for (i = 0; i < 16000; i++)
      swap_4bytes3 (image, LEN);
    gettimeofday (&stop, NULL);
    display (&start, &stop);
}