diff_sq_acc_tb.cpp

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/************************************************
Copyright (c) 2016, Xilinx, Inc.
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.// Copyright (c) 2016 Xilinx, Inc.
************************************************/

#include <stdio.h>
#include "../src/diff_sq_acc.h"



void ref_diff_sq_acc(int a[N], int b[N], long long int *dout)
{
        int i;
        long long int acc  = 0;
    int diff;
    long long int diff2;

        for(i=0; i<N; i++)
        {
                diff = a[i]-b[i];
                diff2 = (long long int) diff * (long long int) diff;
                acc += diff2;
        }

        *dout = acc;

}

int main(void)
{
        int i, k, cnt;
        int ret_val = 0;

        int    a[N],  b[N];
        din_t aa[N], bb[N];

        long long int ref_res;
        dout_t    res;

        cnt = 0;
        for (k=0; k<10; k++)
        {
                //create random data
                for(i=0; i<N; i++)
                {
                        a[i] =  rand() % (1024*16);
                        b[i] =  rand() % (1024*16);
                        aa[i] =  (din_t) a[i];
                        bb[i] =  (din_t) b[i];
                }

                //call reference function
                ref_diff_sq_acc(a, b, &ref_res);

                //call design Under Test
                diff_sq_acc( aa, bb, &res);

                //check results
                printf("got %lld expected %lld\n", (long long int) res.to_double(), (long long int) ref_res);
                if ( (ref_res - (long long int) res) !=0 ) cnt++;
        }

        if (cnt>0)
        {
                printf("TEST FAILED: %d errors\n", cnt);
                ret_val = 1;
        }
        else
        {
                printf("TEST SUCCESS!\n");
                ret_val = 0;
        }


        return ret_val;

}