1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/test/compiler/5091921/Test6897150.java Wed Apr 27 01:25:04 2016 +0800 1.3 @@ -0,0 +1,58 @@ 1.4 +/* 1.5 + * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.23 + * or visit www.oracle.com if you need additional information or have any 1.24 + * questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +/** 1.29 + * @test 1.30 + * @bug 6897150 1.31 + * @summary Hotspot optimises away a valid loop 1.32 + * 1.33 + * @run main Test6897150 1.34 + */ 1.35 + 1.36 +// Should be compiled with javac from JDK1.3 to get bytecode which shows the problem. 1.37 +public class Test6897150 { 1.38 + public static void main(String[] args) { 1.39 + // This works 1.40 + loopAndPrint(Integer.MAX_VALUE -1); 1.41 + // This doesn't 1.42 + loopAndPrint(Integer.MAX_VALUE); 1.43 + } 1.44 + 1.45 + static void verify(int max, int a) { 1.46 + if ( a != (max - 1)) { 1.47 + System.out.println("Expected: " + (max - 1)); 1.48 + System.out.println("Actual : " + a); 1.49 + System.exit(97); 1.50 + } 1.51 + } 1.52 + static void loopAndPrint(int max) { 1.53 + int a = -1; 1.54 + int i = 1; 1.55 + for (; i < max; i++) { 1.56 + a = i; 1.57 + } 1.58 + verify(max, a); 1.59 + } 1.60 +} 1.61 +