1 /*
 2  *  Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 3  *  Copyright (c) 2021, Rado Smogura. All rights reserved.
 4  *
 5  *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 6  *
 7  *  This code is free software; you can redistribute it and/or modify it
 8  *  under the terms of the GNU General Public License version 2 only, as
 9  *  published by the Free Software Foundation.
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 
27 /*
28  * @test
29  * @summary Test if memory ordering is preserved
30  *
31  * @run main/othervm -XX:-TieredCompilation -XX:+UnlockDiagnosticVMOptions -XX:+AbortVMOnCompilationFailure
32  *      -XX:CompileThreshold=100 -XX:CompileCommand=dontinline,compiler.vectorapi.VectorMemoryAlias::test
33  *      compiler.vectorapi.VectorMemoryAlias
34  * @modules jdk.incubator.vector
35  */
36 
37 package compiler.vectorapi;
38 
39 import java.nio.ByteBuffer;
40 import java.nio.ByteOrder;
41 import jdk.incubator.vector.ByteVector;
42 import jdk.incubator.vector.VectorSpecies;
43 
44 public class VectorMemoryAlias {
45   public static final VectorSpecies<Byte> SPECIES = VectorSpecies.ofLargestShape(byte.class);
46   public static void main(String[] args) {
47     for (int i=0; i < 30000; i++) {
48       if (test() != 1) {
49         throw new AssertionError();
50       }
51     }
52   }
53 
54   public static int test() {
55     byte arr[] = new byte[256];
56     final var bb = ByteBuffer.wrap(arr);
57     final var ones = ByteVector.broadcast(SPECIES, 1);
58     var res = ByteVector.zero(SPECIES);
59 
60     int result = 0;
61     result += arr[2];
62     res.add(ones).intoByteBuffer(bb, 0, ByteOrder.nativeOrder());
63     result += arr[2];
64 
65     return result;
66   }
67 }