1 /* 2 * Copyright (c) 2011, 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 6905845 28 * @summary Server VM improperly optimizing away loop. 29 * 30 * @run main Test6905845 31 */ 32 33 public class Test6905845 { 34 35 public static void main(String[] args){ 36 for (int asdf = 0; asdf < 5; asdf++){ 37 //test block 38 { 39 StringBuilder strBuf1 = new StringBuilder(65); 40 long start = System.currentTimeMillis(); 41 int count = 0; 42 43 for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){ 44 strBuf1.append(i); 45 count++; 46 strBuf1.delete(0, 65); 47 } 48 49 System.out.println(count); 50 if (count != 54366674) { 51 System.out.println("wrong count: " + count +", should be 54366674"); 52 System.exit(97); 53 } 54 } 55 //test block 56 { 57 StringBuilder strBuf1 = new StringBuilder(65); 58 long start = System.currentTimeMillis(); 59 int count = 0; 60 61 for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){ 62 strBuf1.append(i); 63 count++; 64 strBuf1.delete(0, 65); 65 } 66 67 System.out.println(count); 68 if (count != 54366674) { 69 System.out.println("wrong count: " + count +", should be 54366674"); 70 System.exit(97); 71 } 72 } 73 } 74 } 75 } 76