                       FIXP_DBL *c_Im,                           FIXP_DBL  a_Re,                           FIXP_DBL  a_Im,                           FIXP_DBL  b_Re,                           FIXP_DBL  b_Im) {   *c_Re = (((long long)a_Re * (long long)b_Re) - ((long long)a_Im * (long long)b_Im))>>00