1 /*
   2  * Copyright (c) 2013, 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 8011706
  27  * @summary loop invariant code motion may move load before store to the same field
  28  *
  29  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
  30  *      compiler.c1.Test8011706
  31  */
  32 
  33 package compiler.c1;
  34 
  35 public class Test8011706 {
  36     int[] array;
  37 
  38     void m(boolean test, int[] array1, int[] array2) {
  39         int i = 0;
  40         if (test) {
  41             array = array1;
  42         } else {
  43             array = array2;
  44         }
  45 
  46         while(true) {
  47             int v = array[i];
  48             i++;
  49             if (i >= 10) return;
  50         }
  51     }
  52 
  53     static public void main(String[] args) {
  54         int[] new_array = new int[10];
  55         Test8011706 ti = new Test8011706();
  56         boolean failed = false;
  57         try {
  58             for (int i = 0; i < 10000; i++) {
  59                 ti.array = null;
  60                 ti.m(true, new_array, new_array);
  61             }
  62         } catch(NullPointerException ex) {
  63             throw new RuntimeException("TEST FAILED", ex);
  64         }
  65         System.out.println("TEST PASSED");
  66     }
  67 
  68 }