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annotate test/compiler/6855215/Test6855215.java @ 3237:399aa66d375e

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Fixed a bug in which the valueEquals method was misused. The method does only check the equality of the node data and not full GVN equality by taking inputs and successors into account.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Jul 2011 14:16:38 -0700
parents c18cbe5936b8
children
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1 /*
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2 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 6855215
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28 * @summary Calculation error (NaN) after about 1500 calculations
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29 *
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30 * @run main/othervm -Xbatch -XX:UseSSE=0 Test6855215
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31 */
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32
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33 public class Test6855215 {
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34 private double m;
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35 private double b;
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36
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37 public static double log10(double x) {
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38 return Math.log(x) / Math.log(10);
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39 }
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40
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41 void calcMapping(double xmin, double xmax, double ymin, double ymax) {
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42 m = (ymax - ymin) / (log10(xmax) - log10(xmin));
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43 b = (log10(xmin) * ymax - log10(xmax) * ymin);
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44 }
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45
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46 public static void main(String[] args) {
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47 Test6855215 c = new Test6855215();
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48 for (int i = 0; i < 30000; i++) {
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49 c.calcMapping(91, 121, 177, 34);
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50 if (c.m != c.m) {
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51 throw new InternalError();
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52 }
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53 }
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54 }
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55 }