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comparison graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/ZeroOrRegister.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.ppc;
24
25 import com.sun.max.asm.*;
26 import com.sun.max.util.*;
27
28 /**
29 * The super type of all the {@link GPR General Purpose Registers} and the constant {@link Zero#ZERO}.
30 */
31 public abstract class ZeroOrRegister extends AbstractSymbolicArgument {
32
33 ZeroOrRegister(String name, int value) {
34 super(name, value);
35 }
36
37 /**
38 * Determines if this register specifier is outside the range of registers
39 * {@code [target .. target+n]} where the range
40 * wraps at 32.
41 */
42 public boolean isOutsideRegisterRange(GPR target, int n) {
43 final int rt = target.value();
44 final int ra = value();
45 final int numRegs = (n + 3) / 4;
46 final int lastReg = (rt + numRegs - 1) % 32;
47 final boolean wrapsAround = lastReg < rt;
48 if (wrapsAround) {
49 return lastReg < ra && ra < rt;
50 }
51 return ra < rt || lastReg < ra;
52 }
53
54 public static Symbolizer<ZeroOrRegister> symbolizer() {
55 if (symbolizer == null) {
56 symbolizer = Symbolizer.Static.fromList(ZeroOrRegister.class, GPR.GPR_SYMBOLIZER, Zero.ZERO);
57 }
58 return symbolizer;
59 }
60
61 // This must be lazily constructed to avoid dependency on the GPR class initializer
62 private static Symbolizer<ZeroOrRegister> symbolizer;
63
64 }