/*

 * Copyright (c) 2019 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

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 */

package org.openjdk.bench.vm.compiler;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.infra.*;

import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class BitSetAndReset {

    private static final int COUNT = 10_000;

    private static final long MASK63 = 0x8000_0000_0000_0000L;

    private static final long MASK31 = 0x0000_0000_8000_0000L;

    private static final long MASK15 = 0x0000_0000_0000_8000L;

    private static final long MASK00 = 0x0000_0000_0000_0001L;

    private long andq, orq;

    private boolean success = true;

    @TearDown(Level.Iteration)

    public void finish() {

        if (!success)

            throw new AssertionError("Failure while setting or clearing long vector bits!");

    }

    @Benchmark

    public void bitSet(Blackhole bh) {

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

            andq = MASK63 | MASK31 | MASK15 | MASK00;

            orq = 0;

            bh.consume(test63());

            bh.consume(test31());

            bh.consume(test15());

            bh.consume(test00());

            success &= andq == 0 && orq == (MASK63 | MASK31 | MASK15 | MASK00);

        }

    }

    private long test63() {

        andq &= ~MASK63;

        orq |= MASK63;

        return 0L;

    }

    private long test31() {

        andq &= ~MASK31;

        orq |= MASK31;

        return 0L;

    }

    private long test15() {

        andq &= ~MASK15;

        orq |= MASK15;

        return 0L;

    }

    private long test00() {

        andq &= ~MASK00;

        orq |= MASK00;

        return 0L;

    }

    private static final long MASK62 = 0x4000_0000_0000_0000L;

    private static final long MASK61 = 0x2000_0000_0000_0000L;

    private static final long MASK60 = 0x1000_0000_0000_0000L;

    private long orq63, orq62, orq61, orq60;

    @Benchmark

    public void throughput(Blackhole bh) {

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

            orq63 = orq62 = orq61 = orq60 = 0;

            bh.consume(testTp());

        }

    }

    private long testTp() {

        orq63 |= MASK63;

        orq62 |= MASK62;

        orq61 |= MASK61;

        orq60 |= MASK60;

        return 0L;

    }

}