/*

 * Copyright (c) 2017, Red Hat, Inc. 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

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 */

/**

 * @test

 * @bug 8191887

 * @summary loop cloning misses support for Opaque4 node

 * @modules java.base/jdk.internal.misc:+open

 *

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

 *

 */

import jdk.internal.misc.Unsafe;

import java.lang.reflect.Field;

import java.util.Arrays;

public class TestLoopUnswitching {

    static final jdk.internal.misc.Unsafe UNSAFE = Unsafe.getUnsafe();

    static final long F_OFFSET;

    static class A {

        int f;

        A(int f) {

            this.f = f;

        }

    }

    static {

        try {

            Field fField = A.class.getDeclaredField("f");

            F_OFFSET = UNSAFE.objectFieldOffset(fField);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

    static int test1(A[] arr, boolean flag1, boolean flag2) {

        int res = 0;

        for (int i = 0; i < 10; i++) {

            A a = arr[i];

            if (flag1) { // triggers unswitching

                res += UNSAFE.getInt(a, F_OFFSET);

            }

            if (flag2) {

                // Opaque4 node here is in the loop but If is out of the loop

                res += UNSAFE.getInt(a, F_OFFSET);

                break;

            }

            res += UNSAFE.getInt(a, F_OFFSET);

        }

        return res;

    }

    static int test2(A[] arr, boolean flag1, boolean flag2) {

        int res = 0;

        for (int i = 0; i < 10; i++) {

            A a = arr[i];

            if (flag1) { // triggers unswitching

                res += UNSAFE.getInt(a, F_OFFSET);

            }

            if (flag2) {

                // Opaque4 node here is out of the loop but Bool is in the the loop

                res += UNSAFE.getInt(a, F_OFFSET);

                break;

            }

            res += a.f;

        }

        return res;

    }

    static public void main(String[] args) {

        A[] arr = new A[1000];

        Arrays.fill(arr, new A(0x42));

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

            test1(arr, (i%2) == 0, (i%2) == 0);

            test2(arr, (i%2) == 0, (i%2) == 0);

        }

    }

}