1 /*
   2  * Copyright (c) 2019, 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 
  26 import java.util.Random;
  27 
  28 /*
  29  * @test
  30  * @bug 8226297
  31  * @run main FailedFloat
  32  */
  33 public class FailedFloat {
  34     private static final int MAX_N = (1 << 13) /* Arrays.MIN_ARRAY_SORT_GRAN */ + 10;
  35 
  36     public static void main(String[] args) {
  37         float[] a = new float[MAX_N];
  38         random(a);
  39         java.util.Arrays.parallelSort(a);
  40         check(a);
  41         System.out.println("PASSED");
  42     }
  43 
  44     private static void random(float[] a) {
  45         Random random = new Random(777);
  46         for (int i = 0; i < MAX_N; i++) {
  47             a[i] = random.nextBoolean() ? -0.0f : 0.0f;
  48         }
  49     }
  50 
  51     private static void check(float[] a) {
  52         for (int i = 0; i < a.length - 1; ++i) {
  53             if (Float.floatToRawIntBits(a[i]) == 0 && Float.floatToRawIntBits(a[i + 1]) < 0) {
  54                 throw new RuntimeException(a[i] + " goes before "+ a[i + 1] + " at position " + i);
  55             }
  56         }
  57     }
  58 }