Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/CRF.java @ 4235:23f41c48b19b
Re-enabled Java cleaning in gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 06 Jan 2012 14:22:57 +0100 |
parents | bc8527f3071c |
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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 } |