30 lines
459 B
Verilog
30 lines
459 B
Verilog
/*
|
|
* 1364-2001 19.3.2 "An undefined text macro has no value, just as if it had
|
|
* never been defined."
|
|
*/
|
|
`define a 1
|
|
|
|
`ifdef a
|
|
`define b 1
|
|
`else
|
|
`define b 0
|
|
`endif
|
|
|
|
`undef a
|
|
|
|
`ifdef a
|
|
`define c 1
|
|
`else
|
|
`define c 0
|
|
`endif
|
|
|
|
module test;
|
|
initial begin
|
|
if(`a+1 !== 1) begin $display("FAIL"); $finish; end
|
|
if(`b+1 === 1) begin $display("FAIL"); $finish; end
|
|
if(`c+1 !== 1) begin $display("FAIL"); $finish; end
|
|
|
|
$display("PASSED");
|
|
end
|
|
endmodule
|