TestPow2.java revision 11833:1cbffa2beba6 
1/*
2 * Copyright (c) 2014, 2016, 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 8063086
27 * @summary X^2 special case for C2 yields different result than interpreter
28 * @library /test/lib /
29 * @modules java.base/jdk.internal.misc
30 *          java.management
31 *
32 * @build sun.hotspot.WhiteBox
33 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
34 *                                sun.hotspot.WhiteBox$WhiteBoxPermission
35 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
36 *                   -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
37 *                   compiler.floatingpoint.TestPow2
38 */
39
40package compiler.floatingpoint;
41
42import compiler.whitebox.CompilerWhiteBoxTest;
43import sun.hotspot.WhiteBox;
44
45import java.lang.reflect.Method;
46
47public class TestPow2 {
48
49    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
50
51    private static final double base = 5350.456329377186;
52    private static final double exp = 2.0;
53
54    static double m() {
55        return Math.pow(base, exp);
56    }
57
58    static public void main(String[] args) throws NoSuchMethodException {
59        Method test_method = TestPow2.class.getDeclaredMethod("m");
60
61        double interpreter_result = m();
62
63        // Compile with C1 if possible
64        WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE);
65
66        double c1_result = m();
67
68        WHITE_BOX.deoptimizeMethod(test_method);
69
70        // Compile it with C2 if possible
71        WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
72
73        double c2_result = m();
74
75        if (interpreter_result != c1_result || interpreter_result != c2_result ||
76            c1_result != c2_result) {
77            System.out.println("interpreter = " + interpreter_result + " c1 = " + c1_result + " c2 = " + c2_result);
78            throw new RuntimeException("Test Failed");
79        }
80    }
81}
82