library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

package gen_pkg is
	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 :/
	subtype cinteger is integer range -(2**(CBITS-2)) to ((2**(CBITS-2))-1);
	function find_msb(a : csigned) return natural;
end package gen_pkg;

package body gen_pkg is
	function find_msb(a : csigned) return natural is
		variable r : natural := 0;
	begin
		for i in (CBITS-1) downto 0 loop
			exit when a(i) = '1';
			r := r+1;
		end loop;
		return (CBITS - r);
	end function find_msb;
end package body gen_pkg;