TestUseCountTrailingZerosInstructionOnUnsupportedCPU.java

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/**
 * @test
 * @bug 8031321
 * @summary Verify processing of UseCountTrailingZerosInstruction option
 *          on CPU without TZCNT instruction (BMI1 feature) support.
 * @library /test/lib /
 * @requires vm.flagless
 * @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.arguments.TestUseCountTrailingZerosInstructionOnUnsupportedCPU
 */

package compiler.arguments;

import jdk.test.lib.cli.CommandLineOptionTest;

public class TestUseCountTrailingZerosInstructionOnUnsupportedCPU
        extends BMIUnsupportedCPUTest {
    private static final String ENABLE_BMI = "-XX:+UseBMI1Instructions";

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

    @Override
    public void unsupportedX86CPUTestCases() throws Throwable {

        super.unsupportedX86CPUTestCases();

        /*
          Verify that option will not be turned on during UseBMI1Instructions
          processing. VM will be launched with following options:
          -XX:+UseBMI1Instructions -version
        */
        CommandLineOptionTest.verifyOptionValueForSameVM(optionName, "false",
                "Feature bmi1 is not supported on current CPU. Option "
                    + "UseCountTrailingZerosInstruction should have 'false'"
                    + " value",
                TestUseCountTrailingZerosInstructionOnUnsupportedCPU.
                        ENABLE_BMI);

        /*
          VM will be launched with following options:
          -XX:+UseCountTrailingZerosInstruction -XX:+UseBMI1Instructions
          -version
        */
        CommandLineOptionTest.verifyOptionValueForSameVM(optionName, "false",
                    "Feature bmi1 is not supported on current CPU. Option "
                    + "UseCountTrailingZerosInstruction should have 'false'"
                    + " value",
                CommandLineOptionTest.prepareBooleanFlag(optionName, true),
                TestUseCountTrailingZerosInstructionOnUnsupportedCPU.
                        ENABLE_BMI);
    }

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