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Java example source code file (Test6897150.java)
The Test6897150.java Java example source code/* * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ /** * @test * @bug 6897150 * @summary Hotspot optimises away a valid loop * * @run main Test6897150 */ // Should be compiled with javac from JDK1.3 to get bytecode which shows the problem. public class Test6897150 { public static void main(String[] args) { // This works loopAndPrint(Integer.MAX_VALUE -1); // This doesn't loopAndPrint(Integer.MAX_VALUE); } static void verify(int max, int a) { if ( a != (max - 1)) { System.out.println("Expected: " + (max - 1)); System.out.println("Actual : " + a); System.exit(97); } } static void loopAndPrint(int max) { int a = -1; int i = 1; for (; i < max; i++) { a = i; } verify(max, a); } } Other Java examples (source code examples)Here is a short list of links related to this Java Test6897150.java source code file: |
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