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library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
entity bug is
port (
a : in unsigned(8-1 downto 0);
b : in unsigned(8-1 downto 0);
d : out signed(8 downto 0)
);
end bug;
architecture behav of bug is
begin
d <= (abs(signed('0' & a) - signed('0' & b)));
end behav;
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