TestLzcntL.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @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 jdk.test.lib.helpers.ClassFileInstaller sun.hotspot.WhiteBox
 * @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);
        }

    }

}