ConstFPVectorization.java revision 11707:ad7af1afda7a 
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
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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
33package compiler.loopopts;
34
35public 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}
65