1 /*

     2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 /*

    27  * @test

    28  * @modules java.base/jdk.internal.misc

    29  * @library /test/lib

    30  *

    31  * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:+EliminateAutoBox

    32  *                   -XX:CompileOnly=::valueOf,::byteValue,::shortValue,::testUnsignedByte,::testUnsignedShort

    33  *                   compiler.eliminateAutobox.UnsignedLoads

    34  */

    35 

    36 package compiler.eliminateAutobox;

    37 

    38 import static jdk.test.lib.Asserts.assertEQ;

    39 

    40 public class UnsignedLoads {

    41     public static int testUnsignedByte() {

    42         byte[] bytes = new byte[] {-1};

    43         int res = 0;

    44         for (int i = 0; i < 100000; i++) {

    45             for (Byte b : bytes) {

    46                 res = b & 0xff;

    47             }

    48         }

    49         return res;

    50     }

    51 

    52     public static int testUnsignedShort() {

    53         int res = 0;

    54         short[] shorts = new short[] {-1};

    55         for (int i = 0; i < 100000; i++) {

    56             for (Short s : shorts) {

    57                 res = s & 0xffff;

    58             }

    59         }

    60         return res;

    61     }

    62 

    63     public static void main(String[] args) {

    64         assertEQ(testUnsignedByte(),    255);

    65         assertEQ(testUnsignedShort(), 65535);

    66         System.out.println("TEST PASSED");

    67     }

    68 }