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/*
* Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @key randomness
* @bug 8031321
* @summary Verify that results of computations are the same w/
* and w/o usage of intrinsic
* @library /test/lib /
* @modules java.base/jdk.internal.misc
* java.management
*
* @build sun.hotspot.WhiteBox
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI
* compiler.intrinsics.bmi.TestLzcntL
*/
package compiler.intrinsics.bmi;
import sun.hotspot.cpuinfo.CPUInfo;
public class TestLzcntL {
public static void main(String args[]) throws Throwable {
if (!CPUInfo.hasFeature("lzcnt")) {
System.out.println("INFO: CPU does not support lzcnt feature.");
}
BMITestRunner.runTests(LzcntLExpr.class, args,
"-XX:+IgnoreUnrecognizedVMOptions",
"-XX:+UseCountLeadingZerosInstruction");
}
public static class LzcntLExpr extends Expr.BitCountingLongExpr {
public long longExpr(long src) {
return Long.numberOfLeadingZeros(src);
}
}
}
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