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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity vector is
port (v: out signed(63 downto 0);
u: out unsigned(63 downto 0));
end vector;
architecture synth of vector is
signal v1 : signed (63 downto 0);
signal u1 : unsigned (63 downto 0);
begin
v1 <= x"0ffffffffffffff0";
v <= v1+(-1);
u1 <= x"00ffffffffffff00";
-- u <= u1 + (-6); -- +4294967290;
u <= u1 + 6;
end synth;
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