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comparison test/compiler/8005033/Test8005033.java @ 7426:65c8342f726a

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8005033: clear high word for integer pop count on SPARC Reviewed-by: kvn, twisti Contributed-by: Richard Reingruber <richard.reingruber@sap.com>
author twisti
date Wed, 19 Dec 2012 14:44:00 -0800
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7425:1e41b0bc58a0 7426:65c8342f726a
1 /*
2 * Copyright 2012 SAP AG. 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 8005033
27 * @summary On sparcv9, C2's intrinsic for Integer.bitCount(OV) returns wrong result if OV is the result of an operation with int overflow.
28 * @run main/othervm -Xcomp -XX:CompileOnly=Test8005033::testBitCount Test8005033
29 * @author Richard Reingruber richard DOT reingruber AT sap DOT com
30 */
31
32 public class Test8005033 {
33 public static int MINUS_ONE = -1;
34
35 public static void main(String[] args) {
36 System.out.println("EXECUTING test.");
37 Integer.bitCount(1); // load class
38 int expectedBitCount = 0;
39 int calculatedBitCount = testBitCount();
40 if (expectedBitCount != calculatedBitCount) {
41 throw new InternalError("got " + calculatedBitCount + " but expected " + expectedBitCount);
42 }
43 System.out.println("SUCCESSFULLY passed test.");
44 }
45
46 // testBitCount will be compiled using the Integer.bitCount() intrinsic if possible
47 private static int testBitCount() {
48 return Integer.bitCount(MINUS_ONE+1); // -1 + 1 => int overflow
49 }
50 }