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comparison test/compiler/6956668/Test6956668.java @ 3743:33e2b8f1d466

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6956668: misbehavior of XOR operator (^) with int Summary: optimize cmp_ne(xor(X,1),0) to cmp_eq(X,0) only for boolean values X. Reviewed-by: never
author kvn
date Tue, 31 May 2011 10:05:36 -0700
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3742:b2cb497dec28 3743:33e2b8f1d466
1 /*
2 * Copyright (c) 2011, 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 /**
26 * @test
27 * @bug 6956668
28 * @summary misbehavior of XOR operator (^) with int
29 *
30 * @run main/othervm -Xbatch Test6956668
31 */
32
33
34 public class Test6956668 {
35
36 public static int bitTest() {
37 int result = 0;
38
39 int testValue = 73;
40 int bitCount = Integer.bitCount(testValue);
41
42 if (testValue != 0) {
43 int gap = Long.numberOfTrailingZeros(testValue);
44 testValue >>>= gap;
45
46 while (testValue != 0) {
47 result++;
48
49 if ((testValue ^= 0x1) != 0) {
50 gap = Long.numberOfTrailingZeros(testValue);
51 testValue >>>= gap;
52 }
53 }
54 }
55
56 if (bitCount != result) {
57 System.out.println("ERROR: " + bitCount + " != " + result);
58 System.exit(97);
59 }
60
61 return (result);
62 }
63
64 public static void main(String[] args) {
65 for (int i = 0; i < 100000; i++) {
66 int ct = bitTest();
67 }
68 }
69 }