1 /*
   2  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 6973329
  27  * @summary C2 with Zero based COOP produces code with broken anti-dependency on x86
  28  *
  29  * @run main/othervm -Xbatch -Xcomp -XX:CompileOnly=Test Test
  30  */
  31 
  32 class A {
  33   A next;
  34   int n;
  35 
  36   public int get_n() {
  37     return n+1;
  38   }
  39 }
  40 public class Test {
  41 
  42   A a;
  43 
  44   void test (A new_next) {
  45     A prev_next = a.next;
  46     a.next = new_next;
  47     if (prev_next == null) {
  48       a.n = a.get_n();
  49     }
  50   }
  51 
  52   public static void main(String args[]) {
  53     Test t = new Test();
  54     t.a = new A();
  55     t.a.n = 1;
  56     t.test(new A());
  57     if (t.a.n != 2) {
  58       System.out.println("Wrong value: " + t.a.n + " expected: 2");
  59       System.exit(97);
  60     }
  61   }
  62 }
  63