jdk8-mips64-public/hotspot: test/compiler/7088419/CRCTest.java@49b5160951dd

     1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /*

    25    @test

    26    @bug 7088419

    27    @run main CRCTest

    28    @summary Use x86 Hardware CRC32 Instruction with java.util.zip.CRC32 and java.util.zip.Adler32

    29  */

    31 import java.nio.ByteBuffer;

    32 import java.util.zip.CRC32;

    33 import java.util.zip.Checksum;

    35 public class CRCTest {

    37     public static void main(String[] args) throws Exception {

    39         byte[] b = initializedBytes(4096 * 4096);

    41         {

    42             CRC32 crc1 = new CRC32();

    43             CRC32 crc2 = new CRC32();

    44             CRC32 crc3 = new CRC32();

    45             CRC32 crc4 = new CRC32();

    47             crc1.update(b, 0, b.length);

    48             updateSerial(crc2, b, 0, b.length);

    49             updateDirect(crc3, b, 0, b.length);

    50             updateSerialSlow(crc4, b, 0, b.length);

    52             check(crc1, crc2);

    53             check(crc3, crc4);

    54             check(crc1, crc3);

    56             crc1.update(17);

    57             crc2.update(17);

    58             crc3.update(17);

    59             crc4.update(17);

    61             crc1.update(b, 1, b.length-2);

    62             updateSerial(crc2, b, 1, b.length-2);

    63             updateDirect(crc3, b, 1, b.length-2);

    64             updateSerialSlow(crc4, b, 1, b.length-2);

    66             check(crc1, crc2);

    67             check(crc3, crc4);

    68             check(crc1, crc3);

    70             report("finished huge crc", crc1, crc2, crc3, crc4);

    72             for (int i = 0; i < 256; i++) {

    73                 for (int j = 0; j < 256; j += 1) {

    74                     crc1.update(b, i, j);

    75                     updateSerial(crc2, b, i, j);

    76                     updateDirect(crc3, b, i, j);

    77                     updateSerialSlow(crc4, b, i, j);

    79                     check(crc1, crc2);

    80                     check(crc3, crc4);

    81                     check(crc1, crc3);

    83                 }

    84             }

    86             report("finished small survey crc", crc1, crc2, crc3, crc4);

    87         }

    89     }

    91     private static void report(String s, Checksum crc1, Checksum crc2,

    92             Checksum crc3, Checksum crc4) {

    93         System.out.println(s + ", crc1 = " + crc1.getValue() +

    94                 ", crc2 = " + crc2.getValue()+

    95                 ", crc3 = " + crc3.getValue()+

    96                 ", crc4 = " + crc4.getValue());

    97     }

    99     private static void check(Checksum crc1, Checksum crc2) throws Exception {

   100         if (crc1.getValue() != crc2.getValue()) {

   101             String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue();

   102             System.err.println(s);

   103             throw new Exception(s);

   104         }

   105     }

   107     private static byte[] initializedBytes(int M) {

   108         byte[] bytes = new byte[M];

   109         for (int i = 0; i < bytes.length; i++) {

   110             bytes[i] = (byte) i;

   111         }

   112         return bytes;

   113     }

   115     private static void updateSerial(Checksum crc, byte[] b, int start, int length) {

   116         for (int i = 0; i < length; i++)

   117             crc.update(b[i+start]);

   118     }

   120     private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) {

   121         for (int i = 0; i < length; i++)

   122             crc.update(b[i+start]);

   123         crc.getValue();

   124     }

   126     private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) {

   127         ByteBuffer buf = ByteBuffer.allocateDirect(length);

   128         buf.put(b, start, length);

   129         buf.flip();

   130         crc3.update(buf);

   131     }

   132 }

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