double2_add double2_cmp double2_eq double2_make double2_out double2_set double3_add double3_cmp double3_eq double3_make double3_out double3_set double4_add double4_cmp double4_eq double4_make double4_out double4_set

double3_add() double3 * double3_add ( const double3 *  d1, const double3 *  d2  ) Return the addition of the double3 values.