1 /*
 2  * Copyright (c) 2021, 2024, 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
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23 
24 /**
25  * @test
26  * @bug 8275276
27  * @summary Test loop unswitching with flat array checks.
28  * @enablePreview
29  * @run main/othervm -Xcomp -XX:CompileCommand=compileonly,TestLoopUnswitchingWithFlatArrayCheck::test TestLoopUnswitchingWithFlatArrayCheck
30  */
31 
32 public class TestLoopUnswitchingWithFlatArrayCheck {
33 
34     Object[] objectArray = new Object[1000];
35 
36     boolean test(Object o) {
37         return false;
38     }
39 
40     private Object test(int start, int end) {
41         Object res = null;
42         Object[] array = objectArray;
43         if (array == null) {
44            return null;
45         }
46         for (int i = start; ; i++) {
47             if (test(array[i])) {
48                 continue;
49             }
50             if (i == end) {
51                 break;
52             }
53         }
54         for (int i = 0; i < 100; i++) {
55             for (; i < 100; i++) {
56                 res = array[i];
57             }
58         }
59         return res;
60     }
61 
62     public static void main(String[] args) {
63         TestLoopUnswitchingWithFlatArrayCheck t = new TestLoopUnswitchingWithFlatArrayCheck();
64         t.test(0, 10);
65     }
66 }