1 /*
2 * Copyright (c) 2015 SAP SE. 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 8080190
27 * @key regression
28 * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f
29 * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate
30 * @author volker.simonis@gmail.com
31 */
32
33 public class IntRotateWithImmediate {
34
35 // This is currently the same as Integer.rotateRight()
36 static int rotateRight(int i, int distance) {
37 // On some architectures (i.e. x86_64 and ppc64) the following computation is
38 // matched in the .ad file into a single MachNode which emmits a single rotate
39 // machine instruction. It is important that the shift amount is masked to match
40 // corresponding immediate width in the native instruction. On x86_64 the rotate
41 // left instruction ('rol') encodes an 8-bit immediate while the corresponding
42 // 'rotlwi' instruction on Power only encodes a 5-bit immediate.
43 return ((i >>> distance) | (i << -distance));
44 }
45
46 static int compute(int x) {
47 return rotateRight(x, 3);
48 }
49
50 public static void main(String args[]) {
51 int val = 4096;
52
53 int firstResult = compute(val);
54
55 for (int i = 0; i < 100000; i++) {
56 int newResult = compute(val);
57 if (firstResult != newResult) {
58 throw new InternalError(firstResult + " != " + newResult);
59 }
60 }
61 System.out.println("OK");
62 }
63
64 }
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1 /*
2 * Copyright (c) 2015 SAP SE. All rights reserved.
3 * Copyright (c) 2016, Red Hat, Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * @test
27 * @bug 8080190
28 * @bug 8154537
29 * @key regression
30 * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f
31 * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate
32 * @author volker.simonis@gmail.com
33 */
34
35 public class IntRotateWithImmediate {
36
37 // This is currently the same as Integer.rotateRight()
38 static int rotateRight1(int i, int distance) {
39 // On some architectures (i.e. x86_64 and ppc64) the following computation is
40 // matched in the .ad file into a single MachNode which emmits a single rotate
41 // machine instruction. It is important that the shift amount is masked to match
42 // corresponding immediate width in the native instruction. On x86_64 the rotate
43 // left instruction ('rol') encodes an 8-bit immediate while the corresponding
44 // 'rotlwi' instruction on Power only encodes a 5-bit immediate.
45 return ((i >>> distance) | (i << -distance));
46 }
47
48 static int rotateRight2(int i, int distance) {
49 return ((i >>> distance) | (i << (32-distance)));
50 }
51
52 static int compute1(int x) {
53 return rotateRight1(x, 3);
54 }
55
56 static int compute2(int x) {
57 return rotateRight2(x, 3);
58 }
59
60 public static void main(String args[]) {
61 int val = 4096;
62
63 int firstResult = compute1(val);
64
65 for (int i = 0; i < 100000; i++) {
66 int newResult = compute1(val);
67 if (firstResult != newResult) {
68 throw new InternalError(firstResult + " != " + newResult);
69 }
70 newResult = compute2(val);
71 if (firstResult != newResult) {
72 throw new InternalError(firstResult + " != " + newResult);
73 }
74 }
75 System.out.println("OK");
76 }
77
78 }
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