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