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