06.01.01_snippet-1.sv

system verilog design book examples

/**********************************************************************
 * Post-increment and pre-increment operators
 *
 * Author: Stuart Sutherland
 *
 * (c) Copyright 2003, Sutherland HDL, Inc. *** ALL RIGHTS RESERVED ***
 * www.sutherland-hdl.com
 *
 * Used with permission in the book, "SystemVerilog for Design"
 *  By Stuart Sutherland, Simon Davidmann, and Peter Flake.
 *  Book copyright: 2003, Kluwer Academic Publishers, Norwell, MA, USA
 *  www.wkap.il, ISBN: 0-4020-7530-8
 *
 * Revision History:
 *   1.00 15 Dec 2003 -- original code, as included in book
 *   1.01 10 Jul 2004 -- cleaned up comments, added expected results
 *                       to output messages
 *
 * Caveat: Expected results displayed for this code example are based
 * on an interpretation of the SystemVerilog 3.1 standard by the code
 * author or authors.  At the time of writing, official SystemVerilog
 * validation suites were not available to validate the example.
 *
 * RIGHT TO USE: This code example, or any portion thereof, may be
 * used and distributed without restriction, provided that this entire
 * comment block is included with the example.
 *
 * DISCLAIMER: THIS CODE EXAMPLE IS PROVIDED "AS IS" WITHOUT WARRANTY
 * OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED
 * TO WARRANTIES OF MERCHANTABILITY, FITNESS OR CORRECTNESS. IN NO
 * EVENT SHALL THE AUTHOR OR AUTHORS BE LIABLE FOR ANY DAMAGES,
 * INCLUDING INCIDENTAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF THE
 * USE OF THIS CODE.
 *********************************************************************/

module test;

  parameter LIMIT = 8;
  int i, j;

  initial begin
    $display("\nExpect i to increment from 0 to 8");
    i = 0;
    while (i++ < LIMIT) begin: loop1
      //...  // last value of i will be LIMIT
      $display("  within loop, i=%0d", i);
    end
    $display("Value of i after loop is %0d (expect 9)", i);

    $display("\nExpect j to increment from 0 to 7");
    j = 0;
    while (++j < LIMIT) begin: loop2
      //...  // last value of j will be LIMIT-1
      $display("  within loop, j=%0d", j);
    end
    $display("Value of j after loop is %0d (expect 8)\n", j);

    $finish;
  end
endmodule