1 /*

     2  * Copyright (c) 2019, 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 8224957

    27  * @summary Test splitting a boxed field load through a loop Phi.

    28  * @run main/othervm -XX:-TieredCompilation -XX:-ProfileInterpreter

    29  *                   -XX:CompileOnly=compiler.eliminateAutobox.TestSplitThroughPhi::test

    30  *                   compiler.eliminateAutobox.TestSplitThroughPhi

    31  */

    32 

    33 package compiler.eliminateAutobox;

    34 

    35 public class TestSplitThroughPhi {

    36 

    37   static volatile boolean loop = true;

    38 

    39   public static void test(Object obj) {

    40       for (int i = 0; i == 0; ) {

    41           // OSR compilation generates Region with 3 input paths

    42           while (true) {

    43               // Load from boxed int

    44               int val = (Integer)obj;

    45               if (val == i++) break;

    46               if (!loop) break;

    47           }

    48       }

    49   }

    50 

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

    52       test(100_000);

    53   }

    54 }