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/*
* 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.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import com.google.common.math.DoubleMath;
import java.math.RoundingMode;
/**
* Benchmarks for the rounding methods of {@code DoubleMath}.
*
* @author Louis Wasserman
*/
public class DoubleMathRoundingBenchmark extends SimpleBenchmark {
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;
@Override
protected 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();
}
}
public int timeRoundToInt(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;
}
public long timeRoundToLong(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;
}
public int timeRoundToBigInteger(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;
}
public int timeLog2Round(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;
}
public static void main(String[] args) {
Runner.main(DoubleMathRoundingBenchmark.class, args);
}
}
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