    #include <stdio.h>
    #include <stdlib.h>
    #include <sys/times.h>

    void do_inst();

    void sobel ( unsigned char *data, float *results, long rows, long cols );

    double time()
    {
        struct tms t;
        times(&t);
        return (t.tms_utime+t.tms_stime)/100.0;
    }

    int main ( int argc, char **argv )
    {
        long rows, cols;
        long count, images;
        int r, c, i;
        double start, end;
        unsigned char **data;
        float *result;

        rows = argc > 1 ? atol(argv[1]) : 1024;
        cols = argc > 2 ? atol(argv[2]) : 1024;
        count = argc > 3 ? atoi(argv[3]) : 1000;
        images = argc > 4 ? atoi(argv[4]) : 10;

        data = (unsigned char **) malloc ( images * sizeof(unsigned char *) );
        for ( i = 0; i < images; i++ ) {
            data[i] = (unsigned char *) malloc ( rows * cols );
            for ( r = 0; r < rows; r++ ) {
                for ( c  = 0; c < cols; c++ ) {
                    data[i][r*cols+c]=random() & 0x0f;
                }
            }
        }
        result = (float *)malloc(rows*cols*sizeof(float));

        start = time();
        for ( i = 0; i < count; i++ ) {
            sobel ( data[i%images], result, rows, cols );
        }
        end = time();
        for ( r = 0; r < 10; r++ ) {
            for ( c  = 0; c < 10; c++ ) {
                printf( "%7d ",data[0][r*cols+c]);
            }
            printf("\n");
        }
        printf("\n");
        for ( r = 0; r < 10; r++ ) {
            for ( c  = 0; c < 10; c++ ) {
                printf( "%7.2f ",result[r*cols+c]);
            }
            printf("\n");
        }

        printf("used: %10.4f\n",end-start);
        printf("FPS: %10.4f\n",count/(end-start));
        return 0;
    }