/*
* Copyright (C) 2010 Google Inc.
*
* 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 benchmarks;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
/**
* How do various ways of iterating through an array compare?
*/
public class ArrayIterationBenchmark extends SimpleBenchmark {
Foo[] mArray = new Foo[27];
{
for (int i = 0; i < mArray.length; ++i) mArray[i] = new Foo();
}
public void timeArrayIteration(int reps) {
for (int rep = 0; rep < reps; ++rep) {
int sum = 0;
for (int i = 0; i < mArray.length; i++) {
sum += mArray[i].mSplat;
}
}
}
public void timeArrayIterationCached(int reps) {
for (int rep = 0; rep < reps; ++rep) {
int sum = 0;
Foo[] localArray = mArray;
int len = localArray.length;
for (int i = 0; i < len; i++) {
sum += localArray[i].mSplat;
}
}
}
public void timeArrayIterationForEach(int reps) {
for (int rep = 0; rep < reps; ++rep) {
int sum = 0;
for (Foo a: mArray) {
sum += a.mSplat;
}
}
}
}