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