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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.randomNonZeroBigInteger;
import static com.google.common.math.MathBenchmarking.randomPositiveBigInteger;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import com.google.common.math.IntMath;
import java.math.RoundingMode;
/**
* Benchmarks for the rounding methods of {@code IntMath}.
*
* @author Louis Wasserman
*/
public class IntMathRoundingBenchmark extends SimpleBenchmark {
private static final int[] positive = new int[ARRAY_SIZE];
private static final int[] nonzero = new int[ARRAY_SIZE];
private static final int[] ints = new int[ARRAY_SIZE];
@Override
protected void setUp() {
for (int i = 0; i < ARRAY_SIZE; i++) {
positive[i] = randomPositiveBigInteger(Integer.SIZE - 2).intValue();
nonzero[i] = randomNonZeroBigInteger(Integer.SIZE - 2).intValue();
ints[i] = RANDOM_SOURCE.nextInt();
}
}
@Param({"DOWN", "UP", "FLOOR", "CEILING", "HALF_EVEN", "HALF_UP", "HALF_DOWN"})
RoundingMode mode;
public int timeLog2(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += IntMath.log2(positive[j], mode);
}
return tmp;
}
public int timeLog10(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += IntMath.log10(positive[j], mode);
}
return tmp;
}
public int timeSqrt(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += IntMath.sqrt(positive[j], mode);
}
return tmp;
}
public int timeDivide(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += IntMath.divide(ints[j], nonzero[j], mode);
}
return tmp;
}
public static void main(String[] args) {
Runner.main(IntMathRoundingBenchmark.class, args);
}
}
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