package math_pkg is
    -- calculates the logarithm dualis of the operand and rounds up
    -- the result to the next integer value.
    function log2c(constant value : in integer) return integer;
    -- returns the maximum of the two operands
    function max(constant value1, value2 : in integer) return integer;
    -- returns the maximum of the three operands
    function max(constant value1, value2, value3 : in integer) return integer;
    -- returns the minimum of the two operands
    function min(constant value1, value2 : in integer) return integer;
end package;


package body math_pkg is

    --*****FUNCTION DEFINITION*****

    function log2c(constant value : in integer) return integer is
        variable ret_value : integer;
        variable cur_value : integer;
    begin
        ret_value := 0;
        cur_value := 1;

        while cur_value < value loop
            ret_value := ret_value + 1;
            cur_value := cur_value * 2;
        end loop;
        return ret_value;
    end function;

    function max(constant value1, value2 : in integer) return integer is
        variable ret_value : integer;
    begin
        if value1 > value2 then
            ret_value := value1;
        else
            ret_value := value2;
        end if;
        return ret_value;
    end function;

    function max(constant value1, value2, value3 : in integer) return integer is
    begin
        return max(max(value1, value2), value3);
    end function;
    
    function min(constant value1, value2 : in integer) return integer is
        variable ret_value : integer;
    begin
        if value1 < value2 then
            ret_value := value1;
        else
            ret_value := value2;
        end if;
        return ret_value;
    end function;
    
    function round_div(constant divident, divisor : in integer) return integer is
        variable ret : integer;
    begin
        ret := divident / divisor;
        if (divident mod divisor /= 0) then
            ret := ret + 1;
        end if;
        return ret;
    end function;
    
 end package body;