/*

 * Copyright (c) 2019, 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 8231550

 * @summary C2: ShouldNotReachHere() in verify_strip_mined_scheduling

 *

 * @run main/othervm -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0 TestConservativeAntiDep

 *

 */

import java.lang.reflect.Array;

import java.util.Arrays;

public class TestConservativeAntiDep {

    private static long longField;

    public static void main(String[] args) throws InstantiationException, IllegalAccessException {

        for (int i = 0; i < 20_000; i++) {

            test1(A.class);

            test2(B.class);

        }

    }

    private static int test1(Class klass) {

        Object[] in = (Object[])Array.newInstance(klass, 100);

        Object[] o = in;

        int v = 1;

        // CountedLoop has control dependent CastPP

        for (int i = 0; i < 100 ; i++) {

            longField = i; // sunk in outer strip mined loop

            o = (A[]) o;

            v *= 2;

        }

        // LoadRange cannot float higher than CountedLoop (because of

        // CastPP) and is found anti-dependent with long store so

        // scheduled in outer strip mined loop

        return v + o.length;

    }

    private static int test2(Class klass) throws IllegalAccessException, InstantiationException {

        A in = (A)klass.newInstance();

        A o = in;

        int v = 1;

        // CountedLoop has control dependent CastPP

        for (int i = 0; i < 100 ; i++) {

            longField = i;  // sunk in outer strip mined loop

            o = (B) o;

            v *= 2;

        }

        // Load cannot float higher than CountedLoop (because of

        // CastPP) and is found anti-dependent with long store so

        // scheduled in outer strip mined loop

        return v + o.intField;

    }

    private static class A {

        int intField;

        public A() {}

    }

    private static class B extends A {

        public B() {}

    }

}