1/*
2 * Copyright (c) 2017, 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 8181872
27 *
28 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions
29 *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=1
30 *                   -XX:-BackgroundCompilation -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test
31 *                   compiler.c1.MultiplyByMaxInt
32 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-BackgroundCompilation
33 *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=3
34 *                   -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test
35 *                   compiler.c1.MultiplyByMaxInt
36 */
37package compiler.c1;
38
39public class MultiplyByMaxInt {
40    static int test(int x) {
41        int loops = (x >>> 4) & 7;
42        while (loops-- > 0) {
43            x = (x * 2147483647) % 16807;
44        }
45        return x;
46    }
47
48    public static void main(String[] args) {
49        for (int i = 0; i < 20000; i++) {
50            test(i);
51        }
52    }
53}
54