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