1 /*
   2  * Copyright (c) 2012, 2013, 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 -XX:+IgnoreUnrecognizedVMOptions -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 }