library ieee;
use ieee.std_logic_1164.all, ieee.numeric_bit.all;


architecture behavior of ir_extender is
begin

  extender : process ( d, immed_en, immed_size_26, immed_unsigned ) is
  begin
    if immed_en = '1' then
      if immed_size_26 = '1' then  -- 26-bit immediate
        if immed_unsigned = '1' then
          q <= to_X01(bit_vector(resize(d(25 downto 0), 32))) after Tpd;
        else
          q <= to_X01(bit_vector(resize(signed(d(25 downto 0)), 32))) after Tpd;
        end if;
      else -- 16-bit immediate
        if immed_unsigned = '1' then
          q <= to_X01(bit_vector(resize(d(15 downto 0), 32))) after Tpd;
        else
          q <= to_X01(bit_vector(resize(signed(d(15 downto 0)), 32))) after Tpd;
        end if;
      end if;
    else
      q <= disabled_dlx_word after Tpd;
    end if;
  end process extender;

end architecture behavior;