iverilog/ivtest/ivltests/signed4.v

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/*
* Copyright (c) 2001 Steve Williams (steve@icarus.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
*/
/* Check that display prints the right signed value. */
module signed1();
reg [7:0] x;
reg signed [7:0] y;
initial
begin
x = 8'b0000_0011;
y = 8'b1111_1101;
$display("x = %0d (should be 3)",x);
$display("y = %0d (should be -3)",y);
x = y;
$display("x = %0d (should be 253)",x);
end
endmodule