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 import com.oracle.java.testlibrary.*;
26 import sun.misc.Unsafe;
27
28 /**
29 * @test
30 * @bug 8078497
31 * @summary Tests correct alignment of vectors with loop invariant offset.
32 * @library /testlibrary
33 * @run main TestVectorizationWithInvariant
34 */
35 public class TestVectorizationWithInvariant {
36
37 private static Unsafe unsafe;
38 private static final long BYTE_ARRAY_OFFSET;
39 private static final long CHAR_ARRAY_OFFSET;
40
41 static {
42 unsafe = Utils.getUnsafe();
43 BYTE_ARRAY_OFFSET = unsafe.arrayBaseOffset(byte[].class);
44 CHAR_ARRAY_OFFSET = unsafe.arrayBaseOffset(char[].class);
45 }
46
47 public static void main(String[] args) throws Exception {
48 byte[] byte_array1 = new byte[1000];
49 byte[] byte_array2 = new byte[1000];
50 char[] char_array = new char[1000];
51
52 for (int i = 0; i < 20_000; ++i) {
53 copyByteToChar(byte_array1, byte_array2, char_array, 1);
54 copyCharToByte(char_array, byte_array1, 1);
55 copyCharToByteAligned(char_array, byte_array1);
56 copyCharToByteUnaligned(char_array, byte_array1);
57 }
58 }
59
60 /*
61 * Copy multiple consecutive chars from a byte array to a given offset in a char array
62 * to trigger C2's superword optimization. The offset in the byte array is independent
63 * of the loop induction variable and can be set to an arbitrary value. It may then not
64 * be possible to both align the LoadUS and the StoreC operations. Therefore, vectorization
65 * should only be done in this case if unaligned memory accesses are allowed.
66 */
67 public static void copyByteToChar(byte[] src1, byte[] src2, char[] dst, int off) {
68 off = (int) BYTE_ARRAY_OFFSET + (off << 1);
69 byte[] src = src1;
70 for (int i = (int) CHAR_ARRAY_OFFSET; i < 100; i = i + 8) {
71 // Copy 8 chars from src to dst
72 unsafe.putChar(dst, i + 0, unsafe.getChar(src, off + 0));
73 unsafe.putChar(dst, i + 2, unsafe.getChar(src, off + 2));
74 unsafe.putChar(dst, i + 4, unsafe.getChar(src, off + 4));
75 unsafe.putChar(dst, i + 6, unsafe.getChar(src, off + 6));
76 unsafe.putChar(dst, i + 8, unsafe.getChar(src, off + 8));
77 unsafe.putChar(dst, i + 10, unsafe.getChar(src, off + 10));
78 unsafe.putChar(dst, i + 12, unsafe.getChar(src, off + 12));
79 unsafe.putChar(dst, i + 14, unsafe.getChar(src, off + 14));
80
81 // Prevent loop invariant code motion of char read.
82 src = (src == src1) ? src2 : src1;
83 }
84 }
85
86 /*
87 * Copy multiple consecutive chars from a char array to a given offset in a byte array
88 * to trigger C2's superword optimization. Checks for similar problems as 'copyByteToChar'.
89 */
90 public static void copyCharToByte(char[] src, byte[] dst, int off) {
91 off = (int) BYTE_ARRAY_OFFSET + (off << 1);
92 for (int i = 0; i < 100; i = i + 8) {
93 // Copy 8 chars from src to dst
94 unsafe.putChar(dst, off + 0, src[i + 0]);
95 unsafe.putChar(dst, off + 2, src[i + 1]);
96 unsafe.putChar(dst, off + 4, src[i + 2]);
97 unsafe.putChar(dst, off + 6, src[i + 3]);
98 unsafe.putChar(dst, off + 8, src[i + 4]);
99 unsafe.putChar(dst, off + 10, src[i + 5]);
100 unsafe.putChar(dst, off + 12, src[i + 6]);
101 unsafe.putChar(dst, off + 14, src[i + 7]);
102 }
103 }
104
105 /*
106 * Variant of copyCharToByte with a constant destination array offset.
107 * The loop should always be vectorized because both the LoadUS and StoreC
108 * operations can be aligned.
109 */
110 public static void copyCharToByteAligned(char[] src, byte[] dst) {
111 final int off = (int) BYTE_ARRAY_OFFSET;
112 for (int i = 8; i < 100; i = i + 8) {
113 // Copy 8 chars from src to dst
114 unsafe.putChar(dst, off + 0, src[i + 0]);
115 unsafe.putChar(dst, off + 2, src[i + 1]);
116 unsafe.putChar(dst, off + 4, src[i + 2]);
117 unsafe.putChar(dst, off + 6, src[i + 3]);
118 unsafe.putChar(dst, off + 8, src[i + 4]);
119 unsafe.putChar(dst, off + 10, src[i + 5]);
120 unsafe.putChar(dst, off + 12, src[i + 6]);
121 unsafe.putChar(dst, off + 14, src[i + 7]);
122 }
123 }
124
125 /*
126 * Variant of copyCharToByte with a constant destination array offset. The
127 * loop should only be vectorized if unaligned memory operations are allowed
128 * because not both the LoadUS and the StoreC can be aligned.
129 */
130 public static void copyCharToByteUnaligned(char[] src, byte[] dst) {
131 final int off = (int) BYTE_ARRAY_OFFSET + 2;
132 for (int i = 0; i < 100; i = i + 8) {
133 // Copy 8 chars from src to dst
134 unsafe.putChar(dst, off + 0, src[i + 0]);
135 unsafe.putChar(dst, off + 2, src[i + 1]);
136 unsafe.putChar(dst, off + 4, src[i + 2]);
137 unsafe.putChar(dst, off + 6, src[i + 3]);
138 unsafe.putChar(dst, off + 8, src[i + 4]);
139 unsafe.putChar(dst, off + 10, src[i + 5]);
140 unsafe.putChar(dst, off + 12, src[i + 6]);
141 unsafe.putChar(dst, off + 14, src[i + 7]);
142 }
143 }
144 }