Instantiating LPM Functions in VHDL: parallel adder

Thank you tricky, finally I ended up with this:

function slv_to_altera_2d_type(dataa : std_logic_vector; datab : std_logic_vector) return altera_mf_logic_2d is
    variable ret : altera_mf_logic_2D(1 downto 0,(dataa'high - dataa'low) downto 0);
    variable temp_dataa,temp_datab : std_logic_vector((dataa'high - dataa'low) downto 0);
    begin
    temp_dataa:=dataa;
    temp_datab:=datab;
        for i in temp_dataa'range loop
            ret(0,i) :=temp_dataa(i);
            ret(1,i) :=temp_datab(i);
        end loop;
        return ret;
end function;

 input(0,16 downto 0)<=signal1(16 downto 0);
 input(1,16 downto 0)<=signal2(16 downto 0);