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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package org.openjdk.bench.java.lang;
  26 
  27 import org.openjdk.jmh.annotations.Benchmark;
  28 import org.openjdk.jmh.annotations.BenchmarkMode;
  29 import org.openjdk.jmh.annotations.Mode;
  30 import org.openjdk.jmh.annotations.OperationsPerInvocation;
  31 import org.openjdk.jmh.annotations.OutputTimeUnit;
  32 import org.openjdk.jmh.annotations.Scope;
  33 import org.openjdk.jmh.annotations.Setup;
  34 import org.openjdk.jmh.annotations.State;
  35 import org.openjdk.jmh.infra.Blackhole;
  36 
  37 import java.util.Random;
  38 import java.util.concurrent.TimeUnit;
  39 
  40 /**
  41  * Tests for sun.misc.FloatingDecimal. Performs floating point number to String conversions.
  42  */
  43 @BenchmarkMode(Mode.AverageTime)
  44 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  45 @State(Scope.Thread)
  46 public class FloatingDecimal {
  47 
  48     private double[] randomArray, twoDecimalsArray, integerArray;
  49     private static final int TESTSIZE = 1000;
  50 
  51     @Setup
  52     public void setup() {
  53         Random r = new Random(1123);
  54         randomArray = new double[TESTSIZE];
  55         twoDecimalsArray = new double[TESTSIZE];
  56         integerArray = new double[TESTSIZE];
  57         for (int i = 0; i < TESTSIZE; i++) {
  58             randomArray[i] = r.nextDouble() * 10000.0D;
  59             twoDecimalsArray[i] = ((double) (10000 - r.nextInt(20000))) / 100;
  60             integerArray[i] = (double) (100 - r.nextInt(200));
  61         }
  62     }
  63 
  64     /** Tests Double.toString on double values generated from Random.nextDouble() */
  65     @Benchmark
  66     @OperationsPerInvocation(TESTSIZE)
  67     public void randomDoubleToString(Blackhole bh) {
  68         for (double d : randomArray) {
  69             bh.consume(Double.toString(d));
  70         }
  71     }
  72 
  73     /** Tests Double.toString on double values that are integers between -100 and 100. */
  74     @Benchmark
  75     @OperationsPerInvocation(TESTSIZE)
  76     public void integerDoubleToString(Blackhole bh) {
  77         for (double d : integerArray) {
  78             bh.consume(Double.toString(d));
  79         }
  80     }
  81 
  82     /** Tests Double.toString on double values that are between -100 and 100 and have two decimal digits. */
  83     @Benchmark
  84     @OperationsPerInvocation(TESTSIZE)
  85     public void twoDecimalsDoubleToString(Blackhole bh) {
  86         for (double d : twoDecimalsArray) {
  87             bh.consume(Double.toString(d));
  88         }
  89     }
  90 
  91 }