test/compiler/arguments/TestUseCountTrailingZerosInstructionOnSupportedCPU.java

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/**
 * @test
 * @bug 8031321
 * @summary Verify processing of UseCountTrailingZerosInstruction option
 *          on CPU with TZCNT (BMI1 feature) support.
 * @library /testlibrary /testlibrary/whitebox
 * @build TestUseCountTrailingZerosInstructionOnSupportedCPU
 *        BMISupportedCPUTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                   -XX:+WhiteBoxAPI
 *                   TestUseCountTrailingZerosInstructionOnSupportedCPU
 */

import sun.hotspot.cpuinfo.CPUInfo;
import com.oracle.java.testlibrary.*;
import com.oracle.java.testlibrary.cli.*;

public class TestUseCountTrailingZerosInstructionOnSupportedCPU
     extends BMISupportedCPUTest {

    public TestUseCountTrailingZerosInstructionOnSupportedCPU() {
        super("UseCountTrailingZerosInstruction", TZCNT_WARNING, "bmi1");
    }

    @Override
    public void runTestCases() throws Throwable {

        super.runTestCases();

        // verify that option will be disabled if all BMI1 instuctions
        // are explicitly disabled
        CommandLineOptionTest.
            verifyOptionValue("UseCountTrailingZerosInstruction", "false",
                              "-XX:-UseBMI1Instructions");

        // verify that option could be turned on even if other BMI1
        // instructions were turned off
        CommandLineOptionTest.
            verifyOptionValue("UseCountTrailingZerosInstruction", "true",
                              "-XX:-UseBMI1Instructions",
                              "-XX:+UseCountTrailingZerosInstruction");
    }

    public static void main(String args[]) throws Throwable {
        new TestUseCountTrailingZerosInstructionOnSupportedCPU().test();
    }
}