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  *
  34  * @build compiler.intrinsics.bmi.TestLzcntI
  35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  36  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  37  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  38  *                   -XX:+WhiteBoxAPI
  39  *                   compiler.intrinsics.bmi.TestLzcntI
  40  */
  41 
  42 package compiler.intrinsics.bmi;
  43 
  44 import sun.hotspot.cpuinfo.CPUInfo;
  45 
  46 public class TestLzcntI {
  47 
  48     public static void main(String args[]) throws Throwable {
  49         if (!CPUInfo.hasFeature("lzcnt")) {
  50             System.out.println("INFO: CPU does not support lzcnt feature.");
  51         }
  52 
  53         BMITestRunner.runTests(LzcntIExpr.class, args,
  54                                "-XX:+IgnoreUnrecognizedVMOptions",
  55                                "-XX:+UseCountLeadingZerosInstruction");
  56     }
  57 
  58     public static class LzcntIExpr extends Expr.BitCountingIntExpr {
  59 
  60         public int intExpr(int src) {
  61             return Integer.numberOfLeadingZeros(src);
  62         }
  63 
  64     }
  65 
  66 }