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/*
* Copyright (C) 2016 Linaro Limited. All rights reserved.
*
* 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: Simple loops around CRC32 intrinsics.
* Main Focus: CRC32-related intrinsics.
*/
package art_benchmarks.micro.intrinsics;
import java.util.Random;
import java.util.zip.CRC32;
public class CRC32Bench {
private byte []bytes = new byte[8192];
private CRC32 crc32 = new CRC32();
private static final int iterCount = 100;
private static final int loopSize = 3000;
public CRC32Bench() {
Random rnd = new Random(0);
rnd.nextBytes(bytes);
}
public void timeUpdateInt(int iterations) {
for (int i = 0; i < iterations; i++) {
benchUpdateInt();
}
}
public void timeUpdateBytes(int iterations) {
for (int i = 0; i < iterations; i++) {
benchUpdateBytes();
}
}
public void benchUpdateInt() {
int count = loopSize * 230;
crc32.reset();
for (int i = 0; i < count; i++) {
crc32.update(i);
}
}
public void benchUpdateBytes() {
crc32.reset();
for (int i = 0; i < loopSize; i++) {
crc32.update(bytes);
}
}
public boolean verifyCRC32Bench() {
byte []tmp = new String("Linaro ART Team 2016.").getBytes();
crc32.reset();
crc32.update(2016);
if (crc32.getValue() != 0x72080DF5L) {
return false;
}
crc32.reset();
crc32.update(tmp, 0, tmp.length - 1);
if (crc32.getValue() != 0x7A7583F7L) {
return false;
}
crc32.reset();
crc32.update(tmp);
if (crc32.getValue() != 0x2D77F07EL) {
return false;
}
return true;
}
public static void main(String[] args) {
int rc = 0;
CRC32Bench obj = new CRC32Bench();
long before = System.currentTimeMillis();
obj.timeUpdateInt(iterCount);
long after = System.currentTimeMillis();
System.out.println("art_benchmarks/micro/intrinsics/CRC32Bench/UpdateInt: " + (after - before));
before = System.currentTimeMillis();
obj.timeUpdateBytes(iterCount);
after = System.currentTimeMillis();
System.out.println("art_benchmarks/micro/intrinsics/CRC32Bench/UpdateBytes: " + (after - before));
if (!obj.verifyCRC32Bench()) {
rc++;
}
System.exit(rc);
}
}
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