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 }