1 /*
   2  * Copyright (c) 2014 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 package org.openjdk.bench.java.lang;
  24 
  25 import org.openjdk.jmh.annotations.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Mode;
  28 import org.openjdk.jmh.annotations.OutputTimeUnit;
  29 import org.openjdk.jmh.annotations.Param;
  30 import org.openjdk.jmh.annotations.Scope;
  31 import org.openjdk.jmh.annotations.Setup;
  32 import org.openjdk.jmh.annotations.State;
  33 
  34 import java.util.concurrent.TimeUnit;
  35 
  36 /**
  37  * Benchmark measuring Unaligned System.arraycopy.
  38  */
  39 @BenchmarkMode(Mode.AverageTime)
  40 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  41 @State(Scope.Thread)
  42 public class ArrayCopyUnalignedDst {
  43 
  44     @Param({"1", "3", "5", "10", "20", "70", "150", "300", "600", "1200"})
  45     int length;
  46 
  47     int fromPos, toPos;
  48     byte[] fromByteArr, toByteArr;
  49     char[] fromCharArr, toCharArr;
  50     int[] fromIntArr, toIntArr;
  51     long[] fromLongArr, toLongArr;
  52 
  53     @Setup
  54     public void setup() {
  55         // Dst position Unaligned
  56         fromPos = 8;
  57         toPos = 9;
  58 
  59         fromByteArr = new byte[1210];
  60         toByteArr = new byte[1210];
  61         fromCharArr = new char[1210];
  62         toCharArr = new char[1210];
  63         fromIntArr = new int[1210];
  64         toIntArr = new int[1210];
  65         fromLongArr = new long[1210];
  66         toLongArr = new long[1210];
  67     }
  68 
  69     @Benchmark
  70     public void testByte() {
  71         System.arraycopy(fromByteArr, fromPos, toByteArr, toPos, length);
  72     }
  73 
  74     @Benchmark
  75     public void testChar() {
  76         System.arraycopy(fromCharArr, fromPos, toCharArr, toPos, length);
  77     }
  78 
  79     @Benchmark
  80     public void testInt() {
  81         System.arraycopy(fromIntArr, fromPos, toIntArr, toPos, length);
  82     }
  83 
  84     @Benchmark
  85     public void testLong() {
  86         System.arraycopy(fromLongArr, fromPos, toLongArr, toPos, length);
  87     }
  88 }