Test6855215.java revision 11707:ad7af1afda7a 
1/*
2 * Copyright (c) 2009, 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
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23 */
24
25/**
26 * @test
27 * @bug 6855215
28 * @summary Calculation error (NaN) after about 1500 calculations
29 *
30 * @run main/othervm -Xbatch -XX:UseSSE=0 compiler.c1.Test6855215
31 */
32
33package compiler.c1;
34
35public class Test6855215 {
36    private double m;
37    private double b;
38
39    public static double log10(double x) {
40        return Math.log(x) / Math.log(10);
41    }
42
43    void calcMapping(double xmin, double xmax, double ymin, double ymax) {
44        m = (ymax - ymin) / (log10(xmax) - log10(xmin));
45        b = (log10(xmin) * ymax - log10(xmax) * ymin);
46    }
47
48    public static void main(String[] args) {
49        Test6855215 c = new Test6855215();
50        for (int i = 0; i < 30000; i++) {
51            c.calcMapping(91, 121, 177, 34);
52            if (c.m != c.m) {
53                throw new InternalError();
54            }
55        }
56    }
57}
58