alias new_name is original_name;
signal alu_result: unsigned(31 downto 0);
alias sign_bit is alu_result(31);
signal operands: std_logic_vector(31 downto 0);
alias left_operand: std_logic_vector(15 downto 0) is operands(31 downto 16);
alias right_operand: std_logic_vector(15 downto 0) is operands(15 downto 0);
procedure sort(a, b: in integer; x, y: out integer) is ...
procedure sort(a, b: in unsigned; x, y: out unsigned) is ...
alias sort_int is sort[integer, integer, integer, integer];
alias sort_uns is sort[unsigned, unsigned, unsigned, unsigned];