makefile: more fun with quartus

[hwmod.git] / src / gen_pkg.vhd

diff --git a/src/gen_pkg.vhd b/src/gen_pkg.vhd
index 6f1ff43d48089bff05b40bd342d988ff68407efa..e654a3b24d5597ce54230ae777d81a22325c6680 100644 (file)
--- a/src/gen_pkg.vhd
+++ b/src/gen_pkg.vhd
@@ -3,7 +3,14 @@ use ieee.std_logic_1164.all;
 use ieee.numeric_std.all;
 
 package gen_pkg is
-       type alu_ops is (NOP, SUB, ADD, MUL, DIV, DONE);
+       subtype alu_ops is std_logic_vector(2 downto 0);
+       constant ALU_NOP : alu_ops := "000";
+       constant ALU_SUB : alu_ops := "001";
+       constant ALU_ADD : alu_ops := "010";
+       constant ALU_MUL : alu_ops := "011";
+       constant ALU_DIV : alu_ops := "100";
+       constant ALU_DONE : alu_ops := "101";
+
        constant CBITS : integer := 32;
        subtype csigned is signed((CBITS-1) downto 0);
        --TODO: bei CBITS-1 gibts einen overflow :/
@@ -14,18 +21,10 @@ end package gen_pkg;
 package body gen_pkg is
        function find_msb(a : csigned) return natural is
                variable r : natural := 0;
-               variable count : boolean := true;
        begin
                for i in (CBITS-1) downto 0 loop
-                       if count then
-                               if a(i) = '1' then
-                                       count := false;
-                               else
-                                       r := r+1;
-                               end if;
-                       else
-                               null;
-                       end if;
+                       exit when a(i) = '1';
+                       r := r+1;
                end loop;
                return (CBITS - r);
        end function find_msb;