1 /*

     2  * Copyright (c) 2012, 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.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 8000805

    27  * @summary JMM issue: short loads are non-atomic

    28  *

    29  * @run main/othervm -server -XX:-TieredCompilation -Xcomp -XX:+PrintCompilation -XX:CompileOnly=Test8000805.loadS2LmaskFF,Test8000805.loadS2Lmask16,Test8000805.loadS2Lmask13,Test8000805.loadUS_signExt,Test8000805.loadB2L_mask8 Test8000805

    30  */

    31 

    32 public class Test8000805 {

    33     static long loadS2LmaskFF   (short[] sa) { return sa[0] & 0xFF; }

    34     static long loadS2LmaskFF_1 (short[] sa) { return sa[0] & 0xFF; }

    35 

    36     static long loadS2Lmask16   (short[] sa) { return sa[0] & 0xFFFE; }

    37     static long loadS2Lmask16_1 (short[] sa) { return sa[0] & 0xFFFE; }

    38 

    39     static long loadS2Lmask13   (short[] sa) { return sa[0] & 0x0FFF; }

    40     static long loadS2Lmask13_1 (short[] sa) { return sa[0] & 0x0FFF; }

    41 

    42     static int loadUS_signExt   (char[] ca) { return (ca[0] << 16) >> 16; }

    43     static int loadUS_signExt_1 (char[] ca) { return (ca[0] << 16) >> 16; }

    44 

    45     static long loadB2L_mask8   (byte[] ba) { return ba[0] & 0x55; }

    46     static long loadB2L_mask8_1 (byte[] ba) { return ba[0] & 0x55; }

    47 

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

    49         for (int i = Byte.MIN_VALUE; i < Byte.MAX_VALUE; i++) {

    50             byte[] ba = new byte[]  { (byte) i};

    51 

    52             { long v1 = loadB2L_mask8(ba);

    53               long v2 = loadB2L_mask8_1(ba);

    54               if (v1 != v2)

    55               throw new InternalError(String.format("loadB2L_mask8 failed: %x != %x", v1, v2)); }

    56         }

    57 

    58         for (int i = Short.MIN_VALUE; i < Short.MAX_VALUE; i++) {

    59             short[] sa = new short[] { (short)i };

    60             char[] ca = new char[] { (char)i };

    61 

    62             { long v1 = loadS2LmaskFF(sa);

    63               long v2 = loadS2LmaskFF_1(sa);

    64               if (v1 != v2)

    65               throw new InternalError(String.format("loadS2LmaskFF failed: %x != %x", v1, v2)); }

    66 

    67             { long v1 = loadS2Lmask16(sa);

    68               long v2 = loadS2Lmask16_1(sa);

    69               if (v1 != v2)

    70               throw new InternalError(String.format("loadS2Lmask16 failed: %x != %x", v1, v2)); }

    71 

    72             { long v1 = loadS2Lmask13(sa);

    73               long v2 = loadS2Lmask13_1(sa);

    74               if (v1 != v2)

    75               throw new InternalError(String.format("loadS2Lmask13 failed: %x != %x", v1, v2)); }

    76 

    77             { int v1 = loadUS_signExt(ca);

    78               int v2 = loadUS_signExt_1(ca);

    79               if (v1 != v2)

    80                 throw new InternalError(String.format("loadUS_signExt failed: %x != %x", v1, v2)); }

    81         }

    82 

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

    84     }

    85 }