4 BIT COMPARATOR Using LOOP (Behavioral)

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity cpr is
    Port ( a : in  STD_LOGIC_VECTOR (3 downto 0):="0000";
           b : in  STD_LOGIC_VECTOR (3 downto 0):="0000";
           e : out  STD_LOGIC;
           l : out  STD_LOGIC;
           g : out  STD_LOGIC);
end cpr;
architecture Behavioral of cpr is
begin
process(a,b)
begin
for i in 3 downto 0 loop
 if a(i)=b(i) then e<='1';l<='0';g<='0';
     else
       if a(i)='0' and b(i)='1' then e<='0';l<='1';g<='0';
             else e<='0';l<='0';g<='1';
       end if;
    exit;
end if;
end loop;
end process;
end Behavioral;