TestSplitIfUnswitchedLoopsEliminated.java revision 11707:ad7af1afda7a 
1/*
2 * Copyright (c) 2015, 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.
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23 */
24
25/**
26 * @test
27 * @bug 8078426
28 * @summary split if finds predicates on several incoming paths when unswitched's loops are optimized out
29 *
30 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement
31 *                   -XX:-BackgroundCompilation -XX:-UseCompressedOops
32 *                   compiler.loopopts.TestSplitIfUnswitchedLoopsEliminated
33 */
34
35package compiler.loopopts;
36
37public class TestSplitIfUnswitchedLoopsEliminated {
38
39    static class A {
40        int f;
41    }
42
43    static A aa = new A();
44    static A aaa = new A();
45
46    static int test_helper(int stop, boolean unswitch) {
47        A a = null;
48        for (int i = 3; i < 10; i++) {
49            if (unswitch) {
50                a = null;
51            } else {
52                a = aa;
53                int v = a.f;
54            }
55        }
56        if (stop != 4) {
57            a = aaa;
58        }
59        if (a != null) {
60            return a.f;
61        }
62        return 0;
63    }
64
65    static int test(boolean unswitch) {
66        int stop = 1;
67        for (; stop < 3; stop *= 4) {
68        }
69        return test_helper(stop, unswitch);
70    }
71
72    public static void main(String[] args) {
73        for (int i = 0; i < 20000; i++) {
74            test_helper(10, i%2 == 0);
75            test(i%2 == 0);
76        }
77    }
78}
79