tests/ice40/add_sub.v - third_party/yosys - Git at Google

 module top
 (
  input [3:0] x,
  input [3:0] y,

  output [3:0] A,
  output [3:0] B
  );

 assign A =  x + y;
 assign B =  x - y;

 endmodule
	module top
	(
	input [3:0] x,
	input [3:0] y,

	output [3:0] A,
	output [3:0] B
	);

	assign A = x + y;
	assign B = x - y;

	endmodule