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/*
* 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 examples;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
/**
* Testing the old canard that looping backwards is faster.
*
* @author Kevin Bourrillion
*/
public class LoopingBackwardsBenchmark extends SimpleBenchmark {
@Param({"2", "20", "2000", "20000000"}) int max;
public int timeForwards(int reps) {
int dummy = 0;
for (int i = 0; i < reps; i++) {
for (int j = 0; j < max; j++) {
dummy += j;
}
}
return dummy;
}
public int timeBackwards(int reps) {
int dummy = 0;
for (int i = 0; i < reps; i++) {
for (int j = max - 1; j >= 0; j--) {
dummy += j;
}
}
return dummy;
}
public static void main(String[] args) throws Exception {
Runner.main(LoopingBackwardsBenchmark.class, args);
}
}
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