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
  30  *      -XX:+PrintCompilation
  31  *      -XX:CompileCommand=compileonly,compiler.c2.Test8000805::load*
  32  *      compiler.c2.Test8000805
  33  */
  34 
  35 package compiler.c2;
  36 public class Test8000805 {
  37     static long  loadS2LmaskFF (short[] sa) { return sa[0] & 0xFF; }
  38     static long _loadS2LmaskFF (short[] sa) { return sa[0] & 0xFF; }
  39 
  40     static long  loadS2Lmask16 (short[] sa) { return sa[0] & 0xFFFE; }
  41     static long _loadS2Lmask16 (short[] sa) { return sa[0] & 0xFFFE; }
  42 
  43     static long  loadS2Lmask13 (short[] sa) { return sa[0] & 0x0FFF; }
  44     static long _loadS2Lmask13 (short[] sa) { return sa[0] & 0x0FFF; }
  45 
  46     static int  loadUS_signExt (char[] ca) { return (ca[0] << 16) >> 16; }
  47     static int _loadUS_signExt (char[] ca) { return (ca[0] << 16) >> 16; }
  48 
  49     static long  loadB2L_mask8 (byte[] ba) { return ba[0] & 0x55; }
  50     static long _loadB2L_mask8 (byte[] ba) { return ba[0] & 0x55; }
  51 
  52     public static void main(String[] args) {
  53         for (int i = Byte.MIN_VALUE; i < Byte.MAX_VALUE; i++) {
  54             byte[] ba = new byte[]  { (byte) i};
  55 
  56             { long v1 =  loadB2L_mask8(ba);
  57               long v2 = _loadB2L_mask8(ba);
  58               if (v1 != v2)
  59               throw new InternalError(String.format("loadB2L_mask8 failed: %x != %x", v1, v2)); }
  60         }
  61 
  62         for (int i = Short.MIN_VALUE; i < Short.MAX_VALUE; i++) {
  63             short[] sa = new short[] { (short)i };
  64             char[] ca = new char[] { (char)i };
  65 
  66             { long v1 =  loadS2LmaskFF(sa);
  67               long v2 = _loadS2LmaskFF(sa);
  68               if (v1 != v2)
  69               throw new InternalError(String.format("loadS2LmaskFF failed: %x != %x", v1, v2)); }
  70 
  71             { long v1 =  loadS2Lmask16(sa);
  72               long v2 = _loadS2Lmask16(sa);
  73               if (v1 != v2)
  74               throw new InternalError(String.format("loadS2Lmask16 failed: %x != %x", v1, v2)); }
  75 
  76             { long v1 =  loadS2Lmask13(sa);
  77               long v2 = _loadS2Lmask13(sa);
  78               if (v1 != v2)
  79               throw new InternalError(String.format("loadS2Lmask13 failed: %x != %x", v1, v2)); }
  80 
  81             { int v1 =  loadUS_signExt(ca);
  82               int v2 = _loadUS_signExt(ca);
  83               if (v1 != v2)
  84                 throw new InternalError(String.format("loadUS_signExt failed: %x != %x", v1, v2)); }
  85         }
  86 
  87         System.out.println("TEST PASSED.");
  88     }
  89 }