russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
81 lines
2.5 KiB
Java
81 lines
2.5 KiB
Java
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.vm.compiler;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Measurement(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Fork(3)
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public class LeadingZeros {
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private static final int SIZE = 512;
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@Benchmark
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public void testInt(Blackhole blackhole, BenchState state) {
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for (int i = 0; i < SIZE; i++) {
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state.result[i] = Integer.numberOfLeadingZeros(state.ints[i]);
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}
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blackhole.consume(state.result);
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}
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@Benchmark
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public void testLong(Blackhole blackhole, BenchState state) {
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for (int i = 0; i < SIZE; i++) {
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state.result[i] = Long.numberOfLeadingZeros(state.longs[i]);
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}
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blackhole.consume(state.result);
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}
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@State(Scope.Benchmark)
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public static class BenchState {
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private final int[] ints = new int[SIZE];
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private final long[] longs = new long[SIZE];
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private final int[] result = new int[SIZE];
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private Random random;
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public BenchState() {
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}
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@Setup
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public void setup() {
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this.random = new Random(1000);
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for (int i = 0; i < SIZE; i++) {
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ints[i] = this.random.nextInt();
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longs[i] = this.random.nextLong();
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}
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}
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}
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}
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