jdk8-mips64-public/hotspot: test/compiler/5091921/Test6897150.java@5201379fe487

     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  */

    25 /**

    26  * @test

    27  * @bug 6897150

    28  * @summary Hotspot optimises away a valid loop

    29  *

    30  * @run main Test6897150

    31  */

    33 // Should be compiled with javac from JDK1.3 to get bytecode which shows the problem.

    34 public class Test6897150 {

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

    36         // This works

    37         loopAndPrint(Integer.MAX_VALUE -1);

    38         // This doesn't

    39         loopAndPrint(Integer.MAX_VALUE);

    40     }

    42     static void verify(int max, int a) {

    43         if ( a != (max - 1)) {

    44             System.out.println("Expected: " + (max - 1));

    45             System.out.println("Actual  : " + a);

    46             System.exit(97);

    47         }

    48     }

    49     static void loopAndPrint(int max) {

    50         int a = -1;

    51         int i = 1;

    52         for (; i < max; i++) {

    53             a = i;

    54         }

    55         verify(max, a);

    56     }

    57 }

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