1 /*

     2  * Copyright (c) 2014 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 package org.openjdk.bench.java.lang;

    24 

    25 import org.openjdk.jmh.annotations.Benchmark;

    26 import org.openjdk.jmh.annotations.BenchmarkMode;

    27 import org.openjdk.jmh.annotations.CompilerControl;

    28 import org.openjdk.jmh.annotations.Mode;

    29 import org.openjdk.jmh.annotations.OutputTimeUnit;

    30 import org.openjdk.jmh.annotations.Param;

    31 import org.openjdk.jmh.annotations.Scope;

    32 import org.openjdk.jmh.annotations.Setup;

    33 import org.openjdk.jmh.annotations.State;

    34 import org.openjdk.jmh.annotations.Threads;

    35 

    36 import java.util.Random;

    37 import java.util.concurrent.TimeUnit;

    38 

    39 @BenchmarkMode(Mode.AverageTime)

    40 @OutputTimeUnit(TimeUnit.NANOSECONDS)

    41 @State(Scope.Thread)

    42 public class MathBench {

    43 

    44     @Param("0")

    45     public long seed;

    46 

    47     public int dividend;

    48     public int divisor;

    49 

    50     public long longDividend;

    51     public long longDivisor;

    52 

    53     @Setup

    54     public void setupValues() {

    55         Random random = new Random(seed);

    56         dividend = Math.abs(random.nextInt() + 4711);

    57         divisor  = Math.abs(random.nextInt(dividend) + 17);

    58         longDividend = Math.abs(random.nextLong() + 4711L);

    59         longDivisor  = Math.abs(random.nextLong() + longDividend);

    60     }

    61 

    62     @Benchmark

    63     @CompilerControl(CompilerControl.Mode.DONT_INLINE)

    64     public int floorModIntIntPositive() {

    65         return Math.floorMod(dividend, divisor);

    66     }

    67 

    68     @Benchmark

    69     @CompilerControl(CompilerControl.Mode.DONT_INLINE)

    70     public int floorModIntInt() {

    71         return Math.floorMod( dividend,  divisor) +

    72                Math.floorMod( dividend, -divisor) +

    73                Math.floorMod(-dividend,  divisor) +

    74                Math.floorMod(-dividend, -divisor);

    75     }

    76 

    77     @Benchmark

    78     @CompilerControl(CompilerControl.Mode.DONT_INLINE)

    79     public int floorModLongInt() {

    80         return Math.floorMod( longDividend,  divisor) +

    81                Math.floorMod( longDividend, -divisor) +

    82                Math.floorMod(-longDividend,  divisor) +

    83                Math.floorMod(-longDividend, -divisor);

    84     }

    85 

    86     @Benchmark

    87     @CompilerControl(CompilerControl.Mode.DONT_INLINE)

    88     public long floorModLongLong() {

    89         return Math.floorMod( longDividend,  longDivisor) +

    90                Math.floorMod( longDividend, -longDivisor) +

    91                Math.floorMod(-longDividend,  longDivisor) +

    92                Math.floorMod(-longDividend, -longDivisor);

    93     }

    94 

    95 }