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.
  22  *
  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/jdk.internal.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 
  40 import sun.hotspot.cpuinfo.CPUInfo;
  41 
  42 public 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 }