module foobaraddsub(a, b, c, d, fa, fs, ba, bs); input [7:0] a, b, c, d; output [7:0] fa, fs, ba, bs; assign fa = a + (* foo *) b; assign fs = a - (* foo *) b; assign ba = c + (* bar *) d; assign bs = c - (* bar *) d; endmodule