test/compiler/7177917/Test7177917.java

rev 7259 : 8044186: Introduce a reproducible random generator
Reviewed-by: iignatyev
Contributed-by: sergei.kovalev@oracle.com

*** 1,7 ****
  /*
!  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 24,40 ****
  
  /*
   * Micro-benchmark for Math.pow() and Math.exp()
   */
  
! import java.util.*;
  
  public class Test7177917 {
  
    static double d;
  
!   static Random r = new Random(0);
  
    static long  m_pow(double[][] values) {
      double res = 0;
      long start = System.nanoTime();
      for (int i = 0; i < values.length; i++) {
--- 24,41 ----
  
  /*
   * Micro-benchmark for Math.pow() and Math.exp()
   */
  
! import com.oracle.java.testlibrary.Utils;
! import java.util.Random;
  
  public class Test7177917 {
  
    static double d;
  
!   static final Random R = Utils.getRandomInstance();
  
    static long  m_pow(double[][] values) {
      double res = 0;
      long start = System.nanoTime();
      for (int i = 0; i < values.length; i++) {
*** 57,70 ****
    }
  
    static double[][] pow_values(int nb) {
      double[][] res = new double[nb][2];
      for (int i = 0; i < nb; i++) {
!       double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
!       double x = Math.abs(Double.longBitsToDouble(r.nextLong()));
        while (x != x) {
!         x = Math.abs(Double.longBitsToDouble(r.nextLong()));
        }
        double logx = Math.log(x) / Math.log(2);
        double y = ylogx / logx;
  
        res[i][0] = x;
--- 58,71 ----
    }
  
    static double[][] pow_values(int nb) {
      double[][] res = new double[nb][2];
      for (int i = 0; i < nb; i++) {
!       double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
!       double x = Math.abs(Double.longBitsToDouble(R.nextLong()));
        while (x != x) {
!         x = Math.abs(Double.longBitsToDouble(R.nextLong()));
        }
        double logx = Math.log(x) / Math.log(2);
        double y = ylogx / logx;
  
        res[i][0] = x;
*** 74,84 ****
    }
  
    static double[] exp_values(int nb) {
      double[] res = new double[nb];
      for (int i = 0; i < nb; i++) {
!       double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
        double x = Math.E;
        double logx = Math.log(x) / Math.log(2);
        double y = ylogx / logx;
        res[i] = y;
      }
--- 75,85 ----
    }
  
    static double[] exp_values(int nb) {
      double[] res = new double[nb];
      for (int i = 0; i < nb; i++) {
!       double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
        double x = Math.E;
        double logx = Math.log(x) / Math.log(2);
        double y = ylogx / logx;
        res[i] = y;
      }