1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package benchmarks.regression;
18
19import com.google.caliper.Param;
20
21/**
22 * Testing the old canard that looping backwards is faster.
23 *
24 * @author Kevin Bourrillion
25 */
26public class LoopingBackwardsBenchmark {
27  @Param({"2", "20", "2000", "20000000"}) int max;
28
29  public int timeForwards(int reps) {
30    int dummy = 0;
31    for (int i = 0; i < reps; i++) {
32      for (int j = 0; j < max; j++) {
33        dummy += j;
34      }
35    }
36    return dummy;
37  }
38
39  public int timeBackwards(int reps) {
40    int dummy = 0;
41    for (int i = 0; i < reps; i++) {
42      for (int j = max - 1; j >= 0; j--) {
43        dummy += j;
44      }
45    }
46    return dummy;
47  }
48}
49