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  * @test

    26  * @bug 7020614

    27  * @summary "-server" mode optimizer makes code hang

    28  *

    29  * @run main/othervm/timeout=30 -Xbatch compiler.c2.Test7020614

    30  */

    31 

    32 package compiler.c2;

    33 

    34 public class Test7020614 {

    35 

    36     private static final int ITERATIONS = 1000;

    37     private static int doNotOptimizeOut = 0;

    38 

    39     public static long bitCountShort() {

    40         long t0 = System.currentTimeMillis();

    41         int sum = 0;

    42         for (int it = 0; it < ITERATIONS; ++it) {

    43             short value = 0;

    44             do {

    45                 sum += Integer.bitCount(value);

    46             } while (++value != 0);

    47         }

    48         doNotOptimizeOut += sum;

    49         return System.currentTimeMillis() - t0;

    50     }

    51 

    52     public static void main(String[] args) {

    53         for (int i = 0; i < 4; ++i) {

    54             System.out.println((i + 1) + ": " + bitCountShort());

    55         }

    56         System.out.println("doNotOptimizeOut value: " + doNotOptimizeOut);

    57     }

    58 }

    59