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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 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;
+ }
+ }
+ }
+}