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+/*
+ * Copyright (C) 2016 Linaro Limited.
+ *
+ * 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.
+ */
+
+/*
+ * Description: Tracks performance of accessing array locations using variables and constants
+ * as indexes.
+ * Main Focus: Memory accesses using arrays.
+ *
+ */
+
+package org.linaro.benchmarks.micro;
+
+import org.openjdk.jmh.annotations.*;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Benchmark)
+
+public class ArrayAccess {
+
+ private static final int ITER_COUNT = 1000;
+ private int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+ public static void accessArrayConstants(int[] array) {
+ for (int j = 0; j < 100000; j++) {
+ array[4]++;
+ array[5]++;
+ }
+ }
+
+ public static void accessArrayVariables(int[] array, int i) {
+ for (int j = 0; j < 100000; j++) {
+ array[i]++;
+ array[i + 1]++;
+ array[i + 2]++;
+ array[i - 2]++;
+ array[i - 1]++;
+ }
+ }
+
+ @Benchmark
+ public void jmhTimeAccessArrayConstants() {
+ for (int i = 0; i < 1000; i++) {
+ accessArrayConstants(array);
+ }
+ }
+
+ @Benchmark
+ public void jmhTimeAccessArrayVariables() {
+ for (int i = 0; i < 1000; i++) {
+ accessArrayVariables(array, 5);
+ }
+ }
+}