lesson_c.c

dsp6713开发板的许多例程.对入门特别有用

/****************************************************************************/
/*                                                                          */
/* lesson_c  -  First version                                               */
/*                                                                          */
/* Results for Release 4.00:                                                */
/*                                                                          */
/*     When compiled with -k -mw -mh -o3:                                   */
/*          10 cycles per iteration - Loop Carry Path on passed pointers    */
/*                                                                          */
/*          Program info needed but not available:                          */
/*              Potential pointer aliasing info                             */
/*              Loop count info - minimum trip count                        */
/*              Loop count info - max trip count factor                     */
/*              Alignment info - xptr and yptr aligned on a word boundary   */
/*                                                                          */
/*     When compiled with -k -mw -mh -o3 -pm -op2 with tutor_d              */
/*           1 cycle per iteration - All info available                     */
/*                                                                          */
/****************************************************************************/


void lesson_c(short *xptr, short *yptr, short *zptr, short *w_sum, int N)
{
    int i, w_vec1, w_vec2;
    short w1,w2;

    w1 = zptr[0];
    w2 = zptr[1];
    for (i = 0; i < N; i++)
    {
        w_vec1 =  xptr[i] * w1;
        w_vec2 =  yptr[i] * w2;
        w_sum[i] = (w_vec1 + w_vec2) >> 15;
    }

}