125 lines
4.0 KiB
Java
125 lines
4.0 KiB
Java
/*
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* Copyright (c) 2014, 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.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.Param;
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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.concurrent.TimeUnit;
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/**
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* Tests speed of multiplication calculations with constants.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@Fork(value = 3)
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public class Multiplication {
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@Param("500")
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private int arraySize;
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private long[] longArraySmall, longArrayBig;
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@Setup
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public void setupSubclass() {
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longArraySmall = new long[arraySize];
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longArrayBig = new long[arraySize];
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/*
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* small values always have higher 32 bits cleared. big values always
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* have higher 32 bits set.
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*/
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for (int i = 0; i < arraySize; i++) {
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longArraySmall[i] = 100L * i + i;
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longArrayBig[i] = ((100L * i + i) << 32) + 4543 + i * 4;
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}
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}
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/* helper for small constant benchmarks. */
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private static long smallConstantHelper(long[] values) {
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long sum = 0;
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for (long value : values) {
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sum += value * 453543L;
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}
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return sum;
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}
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/* helper for big constant benchmarks. */
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private static long bigConstantHelper(long[] values) {
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long sum = 0;
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for (long value : values) {
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sum += value * 4554345533543L;
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}
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return sum;
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}
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/**
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* Test multiplications of longs. One of the operands is a small constant and the other is a variable that always is
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* small.
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*/
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@Benchmark
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public long testLongSmallVariableSmallConstantMul() {
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return smallConstantHelper(longArraySmall);
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}
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/**
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* Test multiplications of longs. One of the operands is a big constant and the other is a variable that always is
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* small.
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*/
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@Benchmark
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public long testLongSmallVariableBigConstantMul() {
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return bigConstantHelper(longArraySmall);
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}
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/**
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* Test multiplications of longs. One of the operands is a small constant and the other is a variable that always is
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* big.
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*/
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@Benchmark
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public long testLongBigVariableSmallConstantMul() {
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return smallConstantHelper(longArrayBig);
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}
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/**
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* Test multiplications of longs. One of the operands is a big constant and the other is a variable that always is
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* big.
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*/
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@Benchmark
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public long testLongBigVariableBigConstantMul() {
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return bigConstantHelper(longArrayBig);
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}
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}
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