Aggiunto modulo Comparator

Comparator.vhd

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+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+
+entity Comparator is
+	generic( BITCOUNT: integer := 8 );
+	port(
+		xT, yT: in std_logic_vector((BITCOUNT-1) downto 0);
+		needSwap: out std_logic
+	);
+end Comparator;
+
+architecture ComparatorArch of Comparator is
+	signal xGTy: std_logic_vector((BITCOUNT-1) downto 0);
+	signal yGTx: std_logic_vector((BITCOUNT-1) downto 0);
+begin
+	xGTy <= xT and (not yT);
+	yGTx <= (not xT) and yT;
+	
+	needSwap_compute: process (xGTy, yGTx)
+		variable SW: std_logic;
+		variable K: std_logic;
+	begin
+		SW := '0';
+		K := '1';
+		for i in (BITCOUNT-1) downto 0 loop
+			SW := SW or ((not(xGTy(i)) and yGTx(i)) and K);
+			K := K and (not(xGTy(i) and not(yGTx(i))));
+		end loop;
+		needSwap <= SW;
+	end process;
+
+end ComparatorArch;
+