/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8086046

 * @summary load bypasses arraycopy that sets the value after the ArrayCopyNode is expanded

 *

 * @run main/othervm -XX:-BackgroundCompilation  -XX:-UseOnStackReplacement

 *                   -XX:CompileCommand=dontinline,compiler.arraycopy.TestLoadBypassArrayCopy::test_helper

 *                   -XX:-TieredCompilation

 *                   compiler.arraycopy.TestLoadBypassArrayCopy

 */

package compiler.arraycopy;

public class TestLoadBypassArrayCopy {

    static long i;

    static boolean test_helper() {

        i++;

        if ((i%10) == 0) {

            return false;

        }

        return true;

    }

    static int test(int[] src, int len, boolean flag) {

        int[] dest = new int[10];

        int res = 0;

        while (test_helper()) {

            System.arraycopy(src, 0, dest, 0, len);

            // predicate moved out of loop so control of following

            // load is not the ArrayCopyNode. Otherwise, if the memory

            // of the load is changed and the control is set to the

            // ArrayCopyNode the graph is unschedulable and the test

            // doesn't fail.

            if (flag) {

            }

            // The memory of this load shouldn't bypass the arraycopy

            res = dest[0];

        }

        return res;

    }

    static public void main(String[] args) {

        int[] src = new int[10];

        src[0] = 0x42;

        for (int i = 0; i < 20000; i++) {

            int res = test(src, 10, false);

            if (res != src[0]) {

                throw new RuntimeException("test failed");

            }

        }

    }

}