197aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes/* 297aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * Copyright (C) 2010 Google Inc. 397aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * 497aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 597aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * you may not use this file except in compliance with the License. 697aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * You may obtain a copy of the License at 797aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * 897aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 997aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * 1097aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * Unless required by applicable law or agreed to in writing, software 1197aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 1297aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1397aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * See the License for the specific language governing permissions and 1497aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * limitations under the License. 1597aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes */ 1697aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes 1797aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughespackage benchmarks.regression; 1897aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes 1997aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughesimport com.google.caliper.Param; 2097aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes 2197aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes/** 2297aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * Testing the old canard that looping backwards is faster. 2397aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * 2497aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes * @author Kevin Bourrillion 2597aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes */ 26ea13f8291a92b6f47f50011da1d5e8c107984bc3Paul Duffinpublic class LoopingBackwardsBenchmark { 2797aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes @Param({"2", "20", "2000", "20000000"}) int max; 2897aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes 2997aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes public int timeForwards(int reps) { 3097aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes int dummy = 0; 3197aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes for (int i = 0; i < reps; i++) { 3297aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes for (int j = 0; j < max; j++) { 3397aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes dummy += j; 3497aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 3597aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 3697aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes return dummy; 3797aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 3897aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes 3997aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes public int timeBackwards(int reps) { 4097aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes int dummy = 0; 4197aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes for (int i = 0; i < reps; i++) { 4297aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes for (int j = max - 1; j >= 0; j--) { 4397aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes dummy += j; 4497aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 4597aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 4697aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes return dummy; 4797aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes } 4897aba27f961a5a6f37dcaf7f455df371e250ede3Elliott Hughes} 49