function [7:0] do_add;
input [7:0] inp_a;
input [7:0] inp_b;
do_add = inp_a + inp_b;
endfunction
module foo(clk, rst, inp_a, inp_b, out);
input wire clk;
input wire rst;
input wire [7:0] inp_a;
input wire [7:0] inp_b;
output reg [7:0] out;
always @(posedge clk)
if (rst) out <= 0;
else out <= do_add (* combinational_adder *) (inp_a, inp_b);
endmodule
