immextend.vbe

i need of vhdl code for 32-bit risc processor

ENTITY immextend IS
PORT (
bitv1 : IN BIT;
bitv2 : IN BIT;
bitv3 : IN BIT;
outvector : OUT bit_vector(7 downto 0)
);
END immextend;

ARCHITECTURE immextend_arch OF immextend IS

BEGIN
 with bitv1&bitv2&bitv3 select
 outvector <= b"00000000" when b"000",
       b"00000001" when b"001",
       b"00000010" when b"010",
       b"00000011" when b"011",
       b"00000100" when b"100",
       b"00000101" when b"101",
       b"00000110" when b"110",
       b"00000111" when b"111";
END;