2442N/A/*
2442N/A * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
2442N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
2442N/A *
2442N/A * This code is free software; you can redistribute it and/or modify it
2442N/A * under the terms of the GNU General Public License version 2 only, as
2442N/A * published by the Free Software Foundation.
2442N/A *
2442N/A * This code is distributed in the hope that it will be useful, but WITHOUT
2442N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
2442N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
2442N/A * version 2 for more details (a copy is included in the LICENSE file that
2442N/A * accompanied this code).
2442N/A *
2442N/A * You should have received a copy of the GNU General Public License version
2442N/A * 2 along with this work; if not, write to the Free Software Foundation,
2442N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
2442N/A *
2442N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2442N/A * or visit www.oracle.com if you need additional information or have any
2442N/A * questions.
2442N/A *
2442N/A */
2442N/A
2442N/A/**
2442N/A * @test
2442N/A * @bug 6897150
2442N/A * @summary Hotspot optimises away a valid loop
2442N/A *
2442N/A * @run main Test6897150
2442N/A */
2442N/A
2442N/A// Should be compiled with javac from JDK1.3 to get bytecode which shows the problem.
2442N/Apublic class Test6897150 {
2442N/A public static void main(String[] args) {
2442N/A // This works
2442N/A loopAndPrint(Integer.MAX_VALUE -1);
2442N/A // This doesn't
2442N/A loopAndPrint(Integer.MAX_VALUE);
2442N/A }
2442N/A
2442N/A static void verify(int max, int a) {
2442N/A if ( a != (max - 1)) {
2442N/A System.out.println("Expected: " + (max - 1));
2442N/A System.out.println("Actual : " + a);
2442N/A System.exit(97);
2442N/A }
2442N/A }
2442N/A static void loopAndPrint(int max) {
2442N/A int a = -1;
2442N/A int i = 1;
2442N/A for (; i < max; i++) {
2442N/A a = i;
2442N/A }
2442N/A verify(max, a);
2442N/A }
2442N/A}
2442N/A