1 /*
   2  * Copyright (c) 2015, 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 8074869
  28  * @summary C2 code generator can replace -0.0f with +0.0f on Linux
  29  * @run main compiler.loopopts.ConstFPVectorization 8
  30  * @author volker.simonis@gmail.com
  31  */
  32 
  33 package compiler.loopopts;
  34 
  35 public class ConstFPVectorization {
  36 
  37     static float[] f = new float[16];
  38     static double[] d = new double[16];
  39 
  40     static void floatLoop(int count) {
  41         for (int i = 0; i < count; i++) {
  42             f[i] = -0.0f;
  43         }
  44     }
  45 
  46     static void doubleLoop(int count) {
  47         for (int i = 0; i < count; i++) {
  48             d[i] = -0.0d;
  49         }
  50     }
  51 
  52     public static void main(String args[]) {
  53         for (int i = 0; i < 10_000; i++) {
  54             floatLoop(Integer.parseInt(args[0]));
  55             doubleLoop(Integer.parseInt(args[0]));
  56         }
  57         for (int i = 0; i < Integer.parseInt(args[0]); i++) {
  58             if (Float.floatToRawIntBits(f[i]) != Float.floatToRawIntBits(-0.0f))
  59                 throw new Error("Float error at index " + i);
  60             if (Double.doubleToRawLongBits(d[i]) != Double.doubleToRawLongBits(-0.0d))
  61                 throw new Error("Double error at index " + i);
  62         }
  63     }
  64 }