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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.RANDOM_SOURCE;
import static com.google.common.math.MathBenchmarking.randomDouble;
import static com.google.common.math.MathBenchmarking.randomPositiveDouble;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
/**
* Tests for the non-rounding methods of {@code DoubleMath}.
*
* @author Louis Wasserman
*/
public class DoubleMathBenchmark extends SimpleBenchmark {
private static final double[] positiveDoubles = new double[ARRAY_SIZE];
private static final int[] factorials = new int[ARRAY_SIZE];
private static final double [] doubles = new double[ARRAY_SIZE];
@Override
protected void setUp() {
for (int i = 0; i < ARRAY_SIZE; i++) {
positiveDoubles[i] = randomPositiveDouble();
doubles[i] = randomDouble(Long.SIZE);
factorials[i] = RANDOM_SOURCE.nextInt(100);
}
}
public long timeLog2(int reps) {
long tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += Double.doubleToRawLongBits(DoubleMath.log2(positiveDoubles[j]));
}
return tmp;
}
public long timeFactorial(int reps) {
long tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += Double.doubleToRawLongBits(DoubleMath.factorial(factorials[j]));
}
return tmp;
}
public int timeIsMathematicalInteger(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
if (DoubleMath.isMathematicalInteger(doubles[j])) {
tmp++;
}
}
return tmp;
}
public int timeIsPowerOfTwo(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
if (DoubleMath.isPowerOfTwo(doubles[j])) {
tmp++;
}
}
return tmp;
}
public static void main(String[] args) {
Runner.main(DoubleMathBenchmark.class, args);
}
}
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