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
  21  * questions.
  22  *
  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 
  33 package compiler.c1;
  34 
  35 public 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 }