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comparison graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/cisc/x86/X86Opcode.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2007, 2011, 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 package com.sun.max.asm.gen.cisc.x86;
24
25 import static com.sun.max.asm.gen.cisc.x86.HexByte.*;
26
27 /**
28 * x86 instruction prefix bytes.
29 */
30 public final class X86Opcode {
31
32 private X86Opcode() {
33 }
34
35 public static final HexByte SEG_ES = _26;
36 public static final HexByte SEG_SS = _36;
37 public static final HexByte SEG_CS = _2E;
38 public static final HexByte SEG_DS = _3E;
39 public static final HexByte REX_MIN = _40;
40 public static final HexByte REX_MAX = _4F;
41 public static final HexByte SEG_FS = _64;
42 public static final HexByte SEG_GS = _65;
43 public static final HexByte OPERAND_SIZE = _66;
44 public static final HexByte ADDRESS_SIZE = _67;
45 public static final HexByte FWAIT = _9B;
46 public static final HexByte LOCK = _F0;
47 public static final HexByte REPNE = _F2;
48 public static final HexByte REPE = _F3;
49
50 public static boolean isRexPrefix(HexByte opcode) {
51 return X86Opcode.REX_MIN.ordinal() <= opcode.ordinal() && opcode.ordinal() <= X86Opcode.REX_MAX.ordinal();
52 }
53
54 public static boolean isFloatingPointEscape(HexByte opcode) {
55 switch (opcode) {
56 case _D8:
57 case _D9:
58 case _DA:
59 case _DB:
60 case _DC:
61 case _DD:
62 case _DE:
63 case _DF:
64 return true;
65 default:
66 return false;
67 }
68 }
69
70 }