TestLzcntL.java revision 8013:f4b8d39bd2a7 
1/*
2 * Copyright (c) 2014, 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.
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23 */
24
25/**
26 * @test
27 * @bug 8031321
28 * @summary Verify that results of computations are the same w/
29 *          and w/o usage of intrinsic
30 * @library /testlibrary /../../test/lib
31 * @modules java.base/sun.misc
32 *          java.management
33 * @build TestLzcntL BMITestRunner Expr
34 * @run main ClassFileInstaller sun.hotspot.WhiteBox
35 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
36 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
37 *                   -XX:+WhiteBoxAPI TestLzcntL
38 */
39
40import sun.hotspot.cpuinfo.CPUInfo;
41
42public class TestLzcntL {
43
44    public static void main(String args[]) throws Throwable {
45        if (!CPUInfo.hasFeature("lzcnt")) {
46            System.out.println("INFO: CPU does not support lzcnt feature.");
47        }
48
49        BMITestRunner.runTests(LzcntLExpr.class, args,
50                               "-XX:+IgnoreUnrecognizedVMOptions",
51                               "-XX:+UseCountLeadingZerosInstruction");
52    }
53
54    public static class LzcntLExpr extends Expr.BitCountingLongExpr {
55
56        public long longExpr(long src) {
57            return Long.numberOfLeadingZeros(src);
58        }
59
60    }
61
62}
63