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 }