[tasks]
parameter_signed_unsigned: parameter port_signed
parameter_signed_signed: parameter port_signed signal_signed
parameter_unsigned_signed: parameter signal_signed
parameter_unsigned_unsigned: parameter
signed_unsigned: port_signed
signed_signed: port_signed signal_signed
unsigned_signed: signal_signed
unsigned_unsigned:

[options]
mode bmc
depth 1
expect pass

[engines]
smtbmc

[script]
port_signed: read -define PORT_SIGNED
parameter: read -define PARAMETER
read -formal test.v
prep -top top
cutpoint -blackbox

[file test.v]
`ifdef PARAMETER
`define DEF_PARAMETER #(parameter WIDTH = 24)
`define USE_PARAMETER #(.WIDTH(8))
`define PORT_WIDTH WIDTH
`else
`define DEF_PARAMETER
`define USE_PARAMETER
`define PORT_WIDTH 8
`endif

`ifdef PORT_SIGNED
`define PORT_SIGNED_WORD signed
`else
`define PORT_SIGNED_WORD
`endif

`ifdef SIGNAL_SIGNED
`define SIGNAL_SIGNED_WORD signed
`else
`define SIGNAL_SIGNED_WORD
`endif


(* blackbox *)
module submod `DEF_PARAMETER (a, b);
	input [`PORT_WIDTH - 1:0] a;
	output `PORT_SIGNED_WORD [`PORT_WIDTH - 1:0] b;
endmodule

module top;
	(*anyconst *) wire [7:0] a;
    wire `SIGNAL_SIGNED_WORD [9:0] b;

	submod `USE_PARAMETER submod(
		.a(a),
		.b(b)
	);

	always @* begin
`ifdef PORT_SIGNED
        assert(b[9] == b[7] && b[8] == b[7]);
`else
		assert(b[9:8] == 0);
`endif
	end
endmodule