Test7177917.java revision 11833:1cbffa2beba6 
1/*
2 * Copyright (c) 2012, 2016, 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/**
26 * @test
27 * @bug 7177917
28 * @summary Micro-benchmark for Math.pow() and Math.exp()
29 * @modules java.base/jdk.internal.misc
30 * @library /test/lib
31 *
32 * @run main compiler.c2.Test7177917
33 */
34
35package compiler.c2;
36
37import jdk.test.lib.Utils;
38
39import java.util.Random;
40
41public class Test7177917 {
42
43  static double d;
44
45  static final Random R = Utils.getRandomInstance();
46
47  static long  m_pow(double[][] values) {
48    double res = 0;
49    long start = System.nanoTime();
50    for (int i = 0; i < values.length; i++) {
51      res += Math.pow(values[i][0], values[i][1]);
52    }
53    long stop = System.nanoTime();
54    d = res;
55    return (stop - start) / 1000;
56  }
57
58  static long  m_exp(double[] values) {
59    double res = 0;
60    long start = System.nanoTime();
61    for (int i = 0; i < values.length; i++) {
62      res += Math.exp(values[i]);
63    }
64    long stop = System.nanoTime();
65    d = res;
66    return (stop - start) / 1000;
67  }
68
69  static double[][] pow_values(int nb) {
70    double[][] res = new double[nb][2];
71    for (int i = 0; i < nb; i++) {
72      double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
73      double x = Math.abs(Double.longBitsToDouble(R.nextLong()));
74      while (x != x) {
75        x = Math.abs(Double.longBitsToDouble(R.nextLong()));
76      }
77      double logx = Math.log(x) / Math.log(2);
78      double y = ylogx / logx;
79
80      res[i][0] = x;
81      res[i][1] = y;
82    }
83    return res;
84  }
85
86  static double[] exp_values(int nb) {
87    double[] res = new double[nb];
88    for (int i = 0; i < nb; i++) {
89      double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
90      double x = Math.E;
91      double logx = Math.log(x) / Math.log(2);
92      double y = ylogx / logx;
93      res[i] = y;
94    }
95    return res;
96  }
97
98  static public void main(String[] args) {
99    {
100      // warmup
101      double[][] warmup_values = pow_values(10);
102      m_pow(warmup_values);
103
104      for (int i = 0; i < 20000; i++) {
105        m_pow(warmup_values);
106      }
107      // test pow perf
108      double[][] values = pow_values(1000000);
109      System.out.println("==> POW " + m_pow(values));
110
111      // force uncommon trap
112      double[][] nan_values = new double[1][2];
113      nan_values[0][0] = Double.NaN;
114      nan_values[0][1] = Double.NaN;
115      m_pow(nan_values);
116
117      // force recompilation
118      for (int i = 0; i < 20000; i++) {
119        m_pow(warmup_values);
120      }
121
122      // test pow perf again
123      System.out.println("==> POW " + m_pow(values));
124    }
125    {
126      // warmup
127      double[] warmup_values = exp_values(10);
128      m_exp(warmup_values);
129
130      for (int i = 0; i < 20000; i++) {
131        m_exp(warmup_values);
132      }
133
134      // test pow perf
135      double[] values = exp_values(1000000);
136      System.out.println("==> EXP " + m_exp(values));
137
138      // force uncommon trap
139      double[] nan_values = new double[1];
140      nan_values[0] = Double.NaN;
141      m_exp(nan_values);
142
143      // force recompilation
144      for (int i = 0; i < 20000; i++) {
145        m_exp(warmup_values);
146      }
147
148      // test pow perf again
149      System.out.println("==> EXP " + m_exp(values));
150    }
151  }
152}
153