| /* |
| * 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); |
| } |
| } |