xorgate.vbe

i need of vhdl code for 32-bit risc processor

ENTITY xorgate IS
PORT (
a1 : IN BIT;
b1 : IN BIT;
c1 : IN BIT;
d1 : OUT BIT
);
END xorgate;

ARCHITECTURE xor_arch OF xorgate IS

BEGIN
  with a1&b1&c1 select
  d1 <= b"0" when b"000",
     b"1" when b"001",
     b"1" when b"010",
     b"0" when b"011",
     b"1" when b"100",
     b"0" when b"101",
     b"0" when b"110",
     b"1" when b"111";
END;