Merge pull request #65 from antonblanchard/loadstore-opt

A small loadstore optimisation, and some reformatting

loadstore2.vhdl

@@ -62,6 +62,7 @@ begin
     loadstore2_0: process(clk)
         variable tmp : std_ulogic_vector(63 downto 0);
         variable data : std_ulogic_vector(63 downto 0);
+        variable sign_extend_byte_reverse : std_ulogic_vector(1 downto 0);
     begin
         if rising_edge(clk) then
             tmp := (others => '0');
@@ -127,13 +128,15 @@ begin
                                 assert false report "invalid length" severity failure;
                         end case;
 
-					if l_saved.sign_extend = '1' then
-						data := sign_extend(data, to_integer(unsigned(l_saved.length)));
-					end if;
+                        sign_extend_byte_reverse := l_saved.sign_extend & l_saved.byte_reverse;
 
-					if l_saved.byte_reverse = '1' then
+                        case sign_extend_byte_reverse is
+                            when "10" =>
+                                data := sign_extend(data, to_integer(unsigned(l_saved.length)));
+                            when "01" =>
                                 data := byte_reverse(data, to_integer(unsigned(l_saved.length)));
-					end if;
+                            when others =>
+                        end case;
 
                         w_tmp.write_data <= data;