---- OLD -----

    int i=0;
    int j=0;

    for (i = 0; i < dim; i++){
        for (j = 0; j < dim; j++){
            dst[RIDX(dim-1-j, i, dim)] = src[RIDX(i,j,dim)];
        } // end inner loop
    } // end outer loop
}

----- NEW -----

    int i=0;
    int j=0;
    int calc=0

    for (i = 0; i < dim; i++){
        calc=i*dim;
        for (j = 0; j < dim; j++){
            calc=calc+j;
            dst[RIDX(dim-1-j, i, dim)] = src[calc];
        } // end inner loop
    } // end outer loop
}


RIDX is defined as ----- i*n + j when called as RIDX(i,j,n)