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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);
}
}
}
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