Mercurial > hg > truffle

annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/CRF.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.asm.ppc;
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24
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25 import com.sun.max.asm.*;
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26 import com.sun.max.util.*;
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27
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28 /**
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29 * The constants denoting the eight 4-bit fields into which the 32-bit Condition Register
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30 * is logically partitioned.
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31 */
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32 public enum CRF implements EnumerableArgument<CRF> {
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33
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34 CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7;
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35
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36 /**
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37 * Determines if a mask of bits only selects one of the 8 condition register fields.
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38 */
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39 public static boolean isExactlyOneCRFSelected(int mask) {
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40 return (mask & (mask - 1)) == 0 && mask > 0 && mask <= 128;
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41 }
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42
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43 public int value() {
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44 return ordinal();
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45 }
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46
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47 public long asLong() {
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48 return value();
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49 }
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50
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51 public String externalValue() {
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52 return Integer.toString(ordinal());
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53 }
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54
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55 public String disassembledValue() {
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56 return externalValue();
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57 }
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58
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59 public Enumerator<CRF> enumerator() {
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60 return ENUMERATOR;
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61 }
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62
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63 public CRF exampleValue() {
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64 return CR0;
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65 }
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66
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67 /**
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68 * Given the index of a bit within this 4-bit field, returns the index of the same bit
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69 * in the 32-bit Condition Register.
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70 *
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71 * @throws IllegalArgumentException if n is not between 0 and 3 inclusive
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72 */
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73 public int bitFor(int n) {
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74 if (n < 0 || n > 3) {
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75 throw new IllegalArgumentException("bit specifier must be between 0 and 3");
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76 }
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77 return ordinal() * 4 + n;
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78 }
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79
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80 /**
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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
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82 */
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83 public int lt() {
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84 return bitFor(LT);
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85 }
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86
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87 /**
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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
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89 */
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90 public int gt() {
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91 return bitFor(GT);
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92 }
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93
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94 /**
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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
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96 */
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97 public int eq() {
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98 return bitFor(EQ);
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99 }
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100
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101 /**
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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
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103 */
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104 public int so() {
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105 return bitFor(SO);
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106 }
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107
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108 /**
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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
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110 */
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111 public int un() {
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112 return bitFor(UN);
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113 }
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114
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115 /**
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116 * Index of the bit in a 4-bit Condition Register field indicating a <i>less than</i> condition.
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117 */
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118 public static final int LT = 0;
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119
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120 /**
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121 * Index of the bit in a 4-bit Condition Register field indicating a <i>greater than</i> condition.
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122 */
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123 public static final int GT = 1;
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124
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125 /**
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126 * Index of the bit in a 4-bit Condition Register field indicating an <i>equal</i> condition.
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127 */
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128 public static final int EQ = 2;
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129
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130 /**
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131 * Index of the bit in a 4-bit Condition Register field indicating a <i>summary overflow</i> condition.
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132 */
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133 public static final int SO = 3;
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134
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135 /**
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136 * Index of the bit in a 4-bit Condition Register field indicating an <i>unordered (after floating-point comparison)</i> condition.
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137 */
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138 public static final int UN = 3;
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139
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140 public static final Enumerator<CRF> ENUMERATOR = new Enumerator<>(CRF.class);
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141
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142 }