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comparison graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/CRF.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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children bc8527f3071c
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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 constants denoting the eight 4-bit fields into which the 32-bit Condition Register
30 * is logically partitioned.
31 */
32 public enum CRF implements EnumerableArgument<CRF> {
33
34 CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7;
35
36 /**
37 * Determines if a mask of bits only selects one of the 8 condition register fields.
38 */
39 public static boolean isExactlyOneCRFSelected(int mask) {
40 return (mask & (mask - 1)) == 0 && mask > 0 && mask <= 128;
41 }
42
43 public int value() {
44 return ordinal();
45 }
46
47 public long asLong() {
48 return value();
49 }
50
51 public String externalValue() {
52 return Integer.toString(ordinal());
53 }
54
55 public String disassembledValue() {
56 return externalValue();
57 }
58
59 public Enumerator<CRF> enumerator() {
60 return ENUMERATOR;
61 }
62
63 public CRF exampleValue() {
64 return CR0;
65 }
66
67 /**
68 * Given the index of a bit within this 4-bit field, returns the index of the same bit
69 * in the 32-bit Condition Register.
70 *
71 * @throws IllegalArgumentException if n is not between 0 and 3 inclusive
72 */
73 public int bitFor(int n) {
74 if (n < 0 || n > 3) {
75 throw new IllegalArgumentException("bit specifier must be between 0 and 3");
76 }
77 return ordinal() * 4 + n;
78 }
79
80 /**
81 * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>less than</i> bit in this Condition Register field
82 */
83 public int lt() {
84 return bitFor(LT);
85 }
86
87 /**
88 * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>greater than</i> bit in this Condition Register field
89 */
90 public int gt() {
91 return bitFor(GT);
92 }
93
94 /**
95 * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>equal</i> bit in this Condition Register field
96 */
97 public int eq() {
98 return bitFor(EQ);
99 }
100
101 /**
102 * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>summary overflow</i> bit in this Condition Register field
103 */
104 public int so() {
105 return bitFor(SO);
106 }
107
108 /**
109 * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>unordered (after floating-point comparison)</i> bit in this Condition Register field
110 */
111 public int un() {
112 return bitFor(UN);
113 }
114
115 /**
116 * Index of the bit in a 4-bit Condition Register field indicating a <i>less than</i> condition.
117 */
118 public static final int LT = 0;
119
120 /**
121 * Index of the bit in a 4-bit Condition Register field indicating a <i>greater than</i> condition.
122 */
123 public static final int GT = 1;
124
125 /**
126 * Index of the bit in a 4-bit Condition Register field indicating an <i>equal</i> condition.
127 */
128 public static final int EQ = 2;
129
130 /**
131 * Index of the bit in a 4-bit Condition Register field indicating a <i>summary overflow</i> condition.
132 */
133 public static final int SO = 3;
134
135 /**
136 * Index of the bit in a 4-bit Condition Register field indicating an <i>unordered (after floating-point comparison)</i> condition.
137 */
138 public static final int UN = 3;
139
140 public static final Enumerator<CRF> ENUMERATOR = new Enumerator<CRF>(CRF.class);
141
142 }