1 /*

     2  * Copyright (c) 2019 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.vm.compiler;

    24 

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

    26 import org.openjdk.jmh.infra.*;

    27 

    28 import java.util.concurrent.TimeUnit;

    29 

    30 @BenchmarkMode(Mode.AverageTime)

    31 @OutputTimeUnit(TimeUnit.NANOSECONDS)

    32 @State(Scope.Thread)

    33 public class BitSetAndReset {

    34     private static final int COUNT = 10_000;

    35 

    36     private static final long MASK63 = 0x8000_0000_0000_0000L;

    37     private static final long MASK31 = 0x0000_0000_8000_0000L;

    38     private static final long MASK15 = 0x0000_0000_0000_8000L;

    39     private static final long MASK00 = 0x0000_0000_0000_0001L;

    40 

    41     private long andq, orq;

    42     private boolean success = true;

    43 

    44     @TearDown(Level.Iteration)

    45     public void finish() {

    46         if (!success)

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

    48     }

    49 

    50     @Benchmark

    51     public void bitSet(Blackhole bh) {

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

    53             andq = MASK63 | MASK31 | MASK15 | MASK00;

    54             orq = 0;

    55             bh.consume(test63());

    56             bh.consume(test31());

    57             bh.consume(test15());

    58             bh.consume(test00());

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

    60         }

    61     }

    62 

    63     private long test63() {

    64         andq &= ~MASK63;

    65         orq |= MASK63;

    66         return 0L;

    67     }

    68     private long test31() {

    69         andq &= ~MASK31;

    70         orq |= MASK31;

    71         return 0L;

    72     }

    73     private long test15() {

    74         andq &= ~MASK15;

    75         orq |= MASK15;

    76         return 0L;

    77     }

    78     private long test00() {

    79         andq &= ~MASK00;

    80         orq |= MASK00;

    81         return 0L;

    82     }

    83 

    84     private static final long MASK62 = 0x4000_0000_0000_0000L;

    85     private static final long MASK61 = 0x2000_0000_0000_0000L;

    86     private static final long MASK60 = 0x1000_0000_0000_0000L;

    87 

    88     private long orq63, orq62, orq61, orq60;

    89 

    90     @Benchmark

    91     public void throughput(Blackhole bh) {

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

    93             orq63 = orq62 = orq61 = orq60 = 0;

    94             bh.consume(testTp());

    95         }

    96     }

    97 

    98     private long testTp() {

    99         orq63 |= MASK63;

   100         orq62 |= MASK62;

   101         orq61 |= MASK61;

   102         orq60 |= MASK60;

   103         return 0L;

   104     }

   105 }