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 */ 23 24 /* 25 * @test 26 * @bug 7088419 27 * @summary Use x86 Hardware CRC32 Instruction with java.util.zip.CRC32 and java.util.zip.Adler32 28 * 29 * @run main compiler.codegen.CRCTest 30 */ 31 32 package compiler.codegen; 33 34 import java.nio.ByteBuffer; 35 import java.util.zip.CRC32; 36 import java.util.zip.Checksum; 37 38 public class CRCTest { 39 main(String[] args)40 public static void main(String[] args) throws Exception { 41 42 byte[] b = initializedBytes(4096 * 4096); 43 44 { 45 CRC32 crc1 = new CRC32(); 46 CRC32 crc2 = new CRC32(); 47 CRC32 crc3 = new CRC32(); 48 CRC32 crc4 = new CRC32(); 49 50 crc1.update(b, 0, b.length); 51 updateSerial(crc2, b, 0, b.length); 52 updateDirect(crc3, b, 0, b.length); 53 updateSerialSlow(crc4, b, 0, b.length); 54 55 check(crc1, crc2); 56 check(crc3, crc4); 57 check(crc1, crc3); 58 59 crc1.update(17); 60 crc2.update(17); 61 crc3.update(17); 62 crc4.update(17); 63 64 crc1.update(b, 1, b.length-2); 65 updateSerial(crc2, b, 1, b.length-2); 66 updateDirect(crc3, b, 1, b.length-2); 67 updateSerialSlow(crc4, b, 1, b.length-2); 68 69 check(crc1, crc2); 70 check(crc3, crc4); 71 check(crc1, crc3); 72 73 report("finished huge crc", crc1, crc2, crc3, crc4); 74 75 for (int i = 0; i < 256; i++) { 76 for (int j = 0; j < 256; j += 1) { 77 crc1.update(b, i, j); 78 updateSerial(crc2, b, i, j); 79 updateDirect(crc3, b, i, j); 80 updateSerialSlow(crc4, b, i, j); 81 82 check(crc1, crc2); 83 check(crc3, crc4); 84 check(crc1, crc3); 85 86 } 87 } 88 89 report("finished small survey crc", crc1, crc2, crc3, crc4); 90 } 91 92 } 93 report(String s, Checksum crc1, Checksum crc2, Checksum crc3, Checksum crc4)94 private static void report(String s, Checksum crc1, Checksum crc2, 95 Checksum crc3, Checksum crc4) { 96 System.out.println(s + ", crc1 = " + crc1.getValue() + 97 ", crc2 = " + crc2.getValue()+ 98 ", crc3 = " + crc3.getValue()+ 99 ", crc4 = " + crc4.getValue()); 100 } 101 check(Checksum crc1, Checksum crc2)102 private static void check(Checksum crc1, Checksum crc2) throws Exception { 103 if (crc1.getValue() != crc2.getValue()) { 104 String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue(); 105 System.err.println(s); 106 throw new Exception(s); 107 } 108 } 109 initializedBytes(int M)110 private static byte[] initializedBytes(int M) { 111 byte[] bytes = new byte[M]; 112 for (int i = 0; i < bytes.length; i++) { 113 bytes[i] = (byte) i; 114 } 115 return bytes; 116 } 117 updateSerial(Checksum crc, byte[] b, int start, int length)118 private static void updateSerial(Checksum crc, byte[] b, int start, int length) { 119 for (int i = 0; i < length; i++) 120 crc.update(b[i+start]); 121 } 122 updateSerialSlow(Checksum crc, byte[] b, int start, int length)123 private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) { 124 for (int i = 0; i < length; i++) 125 crc.update(b[i+start]); 126 crc.getValue(); 127 } 128 updateDirect(CRC32 crc3, byte[] b, int start, int length)129 private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) { 130 ByteBuffer buf = ByteBuffer.allocateDirect(length); 131 buf.put(b, start, length); 132 buf.flip(); 133 crc3.update(buf); 134 } 135 } 136