Aggiunti moduli Swap, TwoComplement, OperationCheck

PrepareForShift.vhd

@@ -0,0 +1,42 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+entity PrepareForShift is
+	port(
+		X, Y: in std_logic_vector(31 downto 0);
+		DIFF_EXP: out std_logic_vector(8 downto 0);
+		SW: out std_logic
+	);
+end PrepareForShift;
+
+architecture PrepareForShiftArch of PrepareForShift is
+	signal LT: std_logic;
+	signal EQ: std_logic;
+	
+	component Comparator is
+		generic( BITCOUNT: integer := 8 );
+	port(
+		xT, yT: in std_logic_vector((BITCOUNT-1) downto 0);
+		needSwap: out std_logic
+	);
+	end component;
+	
+begin
+	C: Comparator
+		port map (xT => X(22 downto 0), yT => Y(22 downto 0), needSwap => LT);
+		
+	--istaziare sommatore la cui uscita va mappata in X(31 downto 23), Y(31 downto 23), DIFF_EXP
+	
+	EQ <= '0';
+	
+	O: process (DIFF_EXP)
+	begin
+		for i in 8 downto 0 loop
+			EQ <= EQ or DIFF_EXP(i);
+		end loop;
+	end process;
+
+	SW <= DIFF_EXP(8) or (EQ and LT);
+
+end PrepareForShiftArch;
+