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/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7088419
* @summary Use x86 Hardware CRC32 Instruction with java.util.zip.CRC32 and java.util.zip.Adler32
*
* @run main compiler.codegen.CRCTest
*/
package compiler.codegen;
import java.nio.ByteBuffer;
import java.util.zip.CRC32;
import java.util.zip.Checksum;
public class CRCTest {
public static void main(String[] args) throws Exception {
byte[] b = initializedBytes(4096 * 4096);
{
CRC32 crc1 = new CRC32();
CRC32 crc2 = new CRC32();
CRC32 crc3 = new CRC32();
CRC32 crc4 = new CRC32();
crc1.update(b, 0, b.length);
updateSerial(crc2, b, 0, b.length);
updateDirect(crc3, b, 0, b.length);
updateSerialSlow(crc4, b, 0, b.length);
check(crc1, crc2);
check(crc3, crc4);
check(crc1, crc3);
crc1.update(17);
crc2.update(17);
crc3.update(17);
crc4.update(17);
crc1.update(b, 1, b.length-2);
updateSerial(crc2, b, 1, b.length-2);
updateDirect(crc3, b, 1, b.length-2);
updateSerialSlow(crc4, b, 1, b.length-2);
check(crc1, crc2);
check(crc3, crc4);
check(crc1, crc3);
report("finished huge crc", crc1, crc2, crc3, crc4);
for (int i = 0; i < 256; i++) {
for (int j = 0; j < 256; j += 1) {
crc1.update(b, i, j);
updateSerial(crc2, b, i, j);
updateDirect(crc3, b, i, j);
updateSerialSlow(crc4, b, i, j);
check(crc1, crc2);
check(crc3, crc4);
check(crc1, crc3);
}
}
report("finished small survey crc", crc1, crc2, crc3, crc4);
}
}
private static void report(String s, Checksum crc1, Checksum crc2,
Checksum crc3, Checksum crc4) {
System.out.println(s + ", crc1 = " + crc1.getValue() +
", crc2 = " + crc2.getValue()+
", crc3 = " + crc3.getValue()+
", crc4 = " + crc4.getValue());
}
private static void check(Checksum crc1, Checksum crc2) throws Exception {
if (crc1.getValue() != crc2.getValue()) {
String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue();
System.err.println(s);
throw new Exception(s);
}
}
private static byte[] initializedBytes(int M) {
byte[] bytes = new byte[M];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) i;
}
return bytes;
}
private static void updateSerial(Checksum crc, byte[] b, int start, int length) {
for (int i = 0; i < length; i++)
crc.update(b[i+start]);
}
private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) {
for (int i = 0; i < length; i++)
crc.update(b[i+start]);
crc.getValue();
}
private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) {
ByteBuffer buf = ByteBuffer.allocateDirect(length);
buf.put(b, start, length);
buf.flip();
crc3.update(buf);
}
}
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