test/compiler/floatingpoint/TestPow2.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8063086
 * @summary X^2 special case for C2 yields different result than interpreter
 * @library /testlibrary /testlibrary/whitebox /compiler/whitebox
 * @build TestPow2
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
 *                   -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestPow2
 *
 */

import java.lang.reflect.*;
import sun.hotspot.WhiteBox;

public class TestPow2 {

    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

    private static final double base = 5350.456329377186;
    private static final double exp = 2.0;

    static double m() {
        return Math.pow(base, exp);
    }

    static public void main(String[] args) throws NoSuchMethodException {
        Method test_method = TestPow2.class.getDeclaredMethod("m");

        double interpreter_result = m();

        // Compile with C1 if possible
        WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE);

        double c1_result = m();

        WHITE_BOX.deoptimizeMethod(test_method);

        // Compile it with C2 if possible
        WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

        double c2_result = m();

        if (interpreter_result != c1_result || interpreter_result != c2_result ||
            c1_result != c2_result) {
            System.out.println("interpreter = " + interpreter_result + " c1 = " + c1_result + " c2 = " + c2_result);
            throw new RuntimeException("Test Failed");
        }
    }
}