142 lines
4.2 KiB
Java
142 lines
4.2 KiB
Java
/*
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* Copyright (c) 2021, Alibaba Group Holding Limited. 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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*/
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package org.openjdk.bench.vm.compiler;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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/**
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* Test for x % 2^n (n is constant)
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*/
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@BenchmarkMode(Mode.AverageTime)
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@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@Fork(value = 3)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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public class ModPowerOf2 {
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@Benchmark
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public int testPositivePowerOf2() {
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int sum = 0;
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for (int i = 0; i < 1000; i++) {
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sum += i % 1;
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sum += i % 2;
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sum += i % 4;
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sum += i % 8;
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sum += i % 16;
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sum += i % 32;
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sum += i % 64;
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sum += i % 128;
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sum += i % 256;
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sum += i % 512;
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sum += i % 1024;
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sum += i % 2048;
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sum += i % 4096;
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sum += i % 8192;
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sum += i % 16384;
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sum += i % 32768;
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sum += i % 65536;
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}
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return sum;
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}
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@Benchmark
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public int testNegativePowerOf2() {
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int sum = 0;
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for (int i = 0; i < 1000; i++) {
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sum += i % -1;
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sum += i % -2;
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sum += i % -4;
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sum += i % -8;
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sum += i % -16;
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sum += i % -32;
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sum += i % -64;
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sum += i % -128;
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sum += i % -256;
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sum += i % -512;
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sum += i % -1024;
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sum += i % -2048;
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sum += i % -4096;
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sum += i % -8192;
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sum += i % -16384;
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sum += i % -32768;
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sum += i % -65536;
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}
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return sum;
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}
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@Benchmark
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public int testMixedPowerOf2() {
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int sum = 0;
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for (int i = 0; i < 1000; i++) {
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sum += i % -1;
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sum += i % 1;
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sum += i % -2;
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sum += i % 2;
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sum += i % -4;
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sum += i % 4;
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sum += i % -8;
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sum += i % 8;
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sum += i % -16;
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sum += i % 16;
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sum += i % -32;
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sum += i % 32;
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sum += i % -64;
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sum += i % 64;
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sum += i % -128;
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sum += i % 128;
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sum += i % -256;
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sum += i % 256;
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sum += i % -512;
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sum += i % 512;
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sum += i % -1024;
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sum += i % 1024;
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sum += i % -2048;
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sum += i % 2048;
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sum += i % -4096;
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sum += i % 4096;
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sum += i % -8192;
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sum += i % 8192;
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sum += i % -16384;
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sum += i % 16384;
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sum += i % -32768;
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sum += i % 32768;
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sum += i % -65536;
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sum += i % 65536;
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}
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return sum;
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}
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}
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