signal sig1 : std_logic;
attribute dont_touch : string;
attribute dont_touch of sig1 : signal is "true";
....
....
sig1 <= in1 and in2;
out1 <= sig1 and in3;
signal sig1 : std_logic;
attribute dont_touch : string;
attribute dont_touch of sig1 : signal is "true";
....
....
sig1 <= in1 and in2;
out1 <= sig1 and in3;