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.OperationsPerInvocation;
  29 import org.openjdk.jmh.annotations.OutputTimeUnit;
  30 import org.openjdk.jmh.annotations.Scope;
  31 import org.openjdk.jmh.annotations.Setup;
  32 import org.openjdk.jmh.annotations.State;
  33 import org.openjdk.jmh.infra.Blackhole;
  34 
  35 import java.util.Random;
  36 import java.util.concurrent.TimeUnit;
  37 
  38 /**
  39  * Tests for sun.misc.FloatingDecimal. Performs floating point number to String conversions.
  40  */
  41 @BenchmarkMode(Mode.AverageTime)
  42 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  43 @State(Scope.Thread)
  44 public class FloatingDecimal {
  45 
  46     private double[] randomArray, twoDecimalsArray, integerArray;
  47     private static final int TESTSIZE = 1000;
  48 
  49     @Setup
  50     public void setup() {
  51         Random r = new Random(1123);
  52         randomArray = new double[TESTSIZE];
  53         twoDecimalsArray = new double[TESTSIZE];
  54         integerArray = new double[TESTSIZE];
  55         for (int i = 0; i < TESTSIZE; i++) {
  56             randomArray[i] = r.nextDouble() * 10000.0D;
  57             twoDecimalsArray[i] = ((double) (10000 - r.nextInt(20000))) / 100;
  58             integerArray[i] = (double) (100 - r.nextInt(200));
  59         }
  60     }
  61 
  62     /** Tests Double.toString on double values generated from Random.nextDouble() */
  63     @Benchmark
  64     @OperationsPerInvocation(TESTSIZE)
  65     public void randomDoubleToString(Blackhole bh) {
  66         for (double d : randomArray) {
  67             bh.consume(Double.toString(d));
  68         }
  69     }
  70 
  71     /** Tests Double.toString on double values that are integers between -100 and 100. */
  72     @Benchmark
  73     @OperationsPerInvocation(TESTSIZE)
  74     public void integerDoubleToString(Blackhole bh) {
  75         for (double d : integerArray) {
  76             bh.consume(Double.toString(d));
  77         }
  78     }
  79 
  80     /** Tests Double.toString on double values that are between -100 and 100 and have two decimal digits. */
  81     @Benchmark
  82     @OperationsPerInvocation(TESTSIZE)
  83     public void twoDecimalsDoubleToString(Blackhole bh) {
  84         for (double d : twoDecimalsArray) {
  85             bh.consume(Double.toString(d));
  86         }
  87     }
  88 
  89 }