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diff --git a/testsuite/gna/issue50/idct.d/sub_489.vhd b/testsuite/gna/issue50/idct.d/sub_489.vhd
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+library ieee;
+use ieee.std_logic_1164.all;
+
+library ieee;
+use ieee.numeric_std.all;
+
+entity sub_489 is
+ port (
+ result : out std_logic_vector(31 downto 0);
+ in_a : in std_logic_vector(31 downto 0);
+ in_b : in std_logic_vector(31 downto 0)
+ );
+end sub_489;
+
+architecture augh of sub_489 is
+
+ signal carry_inA : std_logic_vector(33 downto 0);
+ signal carry_inB : std_logic_vector(33 downto 0);
+ signal carry_res : std_logic_vector(33 downto 0);
+
+begin
+
+ -- To handle the CI input, the operation is '0' - CI
+ -- If CI is not present, the operation is '0' - '0'
+ carry_inA <= '0' & in_a & '0';
+ carry_inB <= '0' & in_b & '0';
+ -- Compute the result
+ carry_res <= std_logic_vector(unsigned(carry_inA) - unsigned(carry_inB));
+
+ -- Set the outputs
+ result <= carry_res(32 downto 1);
+
+end architecture;