91 lines
2.6 KiB
Java
91 lines
2.6 KiB
Java
/*
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* Copyright (C) 2011 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.math;
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import static com.google.common.math.MathBenchmarking.ARRAY_MASK;
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import static com.google.common.math.MathBenchmarking.ARRAY_SIZE;
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import static com.google.common.math.MathBenchmarking.randomDouble;
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import static com.google.common.math.MathBenchmarking.randomPositiveDouble;
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import com.google.caliper.BeforeExperiment;
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import com.google.caliper.Benchmark;
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import com.google.caliper.Param;
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import java.math.RoundingMode;
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/**
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* Benchmarks for the rounding methods of {@code DoubleMath}.
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*
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* @author Louis Wasserman
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*/
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public class DoubleMathRoundingBenchmark {
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private static final double[] doubleInIntRange = new double[ARRAY_SIZE];
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private static final double[] doubleInLongRange = new double[ARRAY_SIZE];
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private static final double[] positiveDoubles = new double[ARRAY_SIZE];
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@Param({"DOWN", "UP", "FLOOR", "CEILING", "HALF_EVEN", "HALF_UP", "HALF_DOWN"})
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RoundingMode mode;
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@BeforeExperiment
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void setUp() {
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for (int i = 0; i < ARRAY_SIZE; i++) {
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doubleInIntRange[i] = randomDouble(Integer.SIZE - 2);
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doubleInLongRange[i] = randomDouble(Long.SIZE - 2);
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positiveDoubles[i] = randomPositiveDouble();
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}
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}
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@Benchmark
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int roundToInt(int reps) {
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int tmp = 0;
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for (int i = 0; i < reps; i++) {
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int j = i & ARRAY_MASK;
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tmp += DoubleMath.roundToInt(doubleInIntRange[j], mode);
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}
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return tmp;
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}
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@Benchmark
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long roundToLong(int reps) {
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long tmp = 0;
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for (int i = 0; i < reps; i++) {
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int j = i & ARRAY_MASK;
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tmp += DoubleMath.roundToLong(doubleInLongRange[j], mode);
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}
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return tmp;
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}
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@Benchmark
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int roundToBigInteger(int reps) {
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int tmp = 0;
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for (int i = 0; i < reps; i++) {
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int j = i & ARRAY_MASK;
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tmp += DoubleMath.roundToBigInteger(positiveDoubles[j], mode).intValue();
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}
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return tmp;
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}
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@Benchmark
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int log2Round(int reps) {
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int tmp = 0;
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for (int i = 0; i < reps; i++) {
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int j = i & ARRAY_MASK;
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tmp += DoubleMath.log2(positiveDoubles[j], mode);
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}
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return tmp;
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}
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}
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