| // |
| // Copyright (c) 1999 Steven Wilson (stevew@home.com) |
| // |
| // This source code is free software; you can redistribute it |
| // and/or modify it in source code form under the terms of the GNU |
| // General Public License as published by the Free Software |
| // Foundation; either version 2 of the License, or (at your option) |
| // any later version. |
| // |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| // |
| // SDW: Function with if clause |
| // |
| // D: |
| // |
| |
| module main (); |
| |
| reg [3:0] global_var; |
| reg [3:0] result; |
| // Interesting because 2 * 0 is 0 ;-) |
| function [3:0] my_func ; |
| input [3:0] a; |
| begin |
| if(a == 4'b0) |
| my_func = 4'b0; |
| else |
| my_func = a + a; |
| end |
| endfunction |
| |
| initial |
| begin |
| global_var = 2; |
| result = my_func(global_var); |
| |
| if(result != 4) |
| begin |
| $display("FAILED - function didn't function!\n"); |
| $finish ; |
| end |
| |
| $display("PASSED\n"); |
| $finish ; |
| end |
| endmodule |
