TestCastIINoLoopLimitCheck.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.
22 *
23 */
24
25/**
26 * @test
27 * @bug 8073184
28 * @summary CastII that guards counted loops confuses range check elimination with LoopLimitCheck off
29 *
30 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp
31 *      -XX:CompileCommand=compileonly,compiler.loopopts.TestCastIINoLoopLimitCheck::m
32 *      compiler.loopopts.TestCastIINoLoopLimitCheck
33 */
34
35package compiler.loopopts;
36/*
37 * The test was originally run with
38 *
39 * -XX:+UnlockDiagnosticVMOptions -XX:-LoopLimitCheck
40 *
41 * to trigger a problem with code guarded with !LoopLimitCheck.
42 * JDK-8072422 has removed that code but kept the test because the
43 * test generates an interesting graph shape.
44 */
45public class TestCastIINoLoopLimitCheck {
46
47    static void m(int i, int index, char[] buf) {
48        while (i >= 65536) {
49            i = i / 100;
50            buf [--index] = 0;
51            buf [--index] = 1;
52        }
53    }
54
55    static public void main(String[] args) {
56        m(0, 0, null);
57    }
58}
59