Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/BOOperand.java @ 3735:61369a06f03c
Updated authors file.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 20:36:28 +0100 |
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rev | line source |
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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 argument to a Branch Conditional instruction specifying the conditions |
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30 * under which the branch is taken. |
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31 */ |
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32 public final class BOOperand extends AbstractSymbolicArgument { |
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33 |
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34 private BOOperand(String value, String predictionBitsMask) { |
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35 this(value, null, null, predictionBitsMask); |
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36 } |
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37 |
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38 private BOOperand(String value) { |
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39 this(value, null, null, null); |
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40 } |
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41 |
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42 private BOOperand(String value, BOOperand taken, BOOperand notTaken, String predictionBitsMask) { |
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43 super(Integer.parseInt(value, 2)); |
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44 assert value.length() == 5; |
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45 assert predictionBitsMask == null || predictionBitsMask.length() == value.length(); |
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46 |
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47 this.taken = taken; |
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48 this.notTaken = notTaken; |
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49 |
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50 if (predictionBitsMask == null) { |
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51 valueWithoutPredictionBits = Integer.MAX_VALUE; |
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52 } else { |
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53 int valWithoutPredictionBits = 0; |
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54 int bit = 1 << (value.length() - 1); |
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55 for (int i = 0; i != predictionBitsMask.length(); ++i) { |
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56 if (predictionBitsMask.charAt(i) == '0') { |
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57 if (value.charAt(i) == '1') { |
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58 valWithoutPredictionBits |= bit; |
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59 } |
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60 } else { |
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61 valWithoutPredictionBits >>= 1; |
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62 } |
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63 bit >>= 1; |
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64 } |
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65 this.valueWithoutPredictionBits = valWithoutPredictionBits; |
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66 } |
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67 } |
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68 |
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69 /** |
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70 * The GNU assembler syntax does not have symbols for the valid values |
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71 * and only accepts numeric arguments. |
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72 */ |
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73 @Override |
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74 public String externalValue() { |
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75 return Integer.toString(value()); |
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76 } |
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77 |
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78 private final BOOperand taken; |
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79 private final BOOperand notTaken; |
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80 private final int valueWithoutPredictionBits; |
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81 |
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82 /** |
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83 * @return the version of this branch condition operand that has the relevant bits set to indicate to the hardware that the branch is very likely not to be taken |
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84 * |
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85 * @throws IllegalArgumentException if prediction bits cannot be set for this operand |
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86 */ |
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87 public BOOperand taken() { |
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88 if (taken == null) { |
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89 throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); |
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90 } |
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91 return taken; |
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92 } |
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93 |
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94 /** |
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95 * @return the version of this branch condition operand that has the relevant bits set to indicate to the hardware that the branch is very likely not to be taken |
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96 * |
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97 * @throws IllegalArgumentException if prediction bits cannot be set for this operand |
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98 */ |
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99 public BOOperand notTaken() { |
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100 if (notTaken == null) { |
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101 throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); |
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102 } |
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103 return notTaken; |
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104 } |
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105 |
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106 /** |
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107 * @return the mask to apply to this branch condition operand to extract the branch prediction bits |
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108 * |
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109 * @throws IllegalArgumentException if this branch condition operand does not support branch prediction |
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110 */ |
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111 public int valueWithoutPredictionBits() { |
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112 if (valueWithoutPredictionBits == Integer.MAX_VALUE) { |
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113 throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); |
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114 } |
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115 |
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116 return valueWithoutPredictionBits; |
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117 } |
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118 |
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119 // Checkstyle: stop constant name check |
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120 |
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121 /** |
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122 * Decrement the Counter Register, then branch if the decremented value is not 0 and |
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123 * the bit in the Condition Register selected by the BI field is not set. |
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124 */ |
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125 public static final BOOperand CTRNonZero_CRFalse = new BOOperand("00000"); |
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126 |
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127 /** |
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128 * Decrement the Counter Register, then branch if the decremented value is 0 and |
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129 * the bit in the Condition Register selected by the BI field is not set. |
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130 */ |
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131 public static final BOOperand CTRZero_CRFalse = new BOOperand("00010"); |
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132 |
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133 /** |
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134 * Branch if the bit in the Condition Register selected by the BI field is not set |
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135 * and indicate that the branch is very likely to be taken. |
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136 */ |
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137 public static final BOOperand CRFalse_PredictTaken = new BOOperand("00111", "00011"); |
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138 |
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139 /** |
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140 * Branch if the bit in the Condition Register selected by the BI field is not set |
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141 * and indicate that the branch is very likely not to be taken. |
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142 */ |
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143 public static final BOOperand CRFalse_PredictNotTaken = new BOOperand("00110", "00011"); |
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144 |
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145 /** |
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146 * Branch if the bit in the Condition Register selected by the BI field is not set. |
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147 */ |
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148 public static final BOOperand CRFalse = new BOOperand("00100", CRFalse_PredictTaken, CRFalse_PredictNotTaken, "00011"); |
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149 |
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150 /** |
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151 * Decrement the Counter Register, then branch if the decremented value is not 0 and |
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152 * the bit in the Condition Register selected by the BI field is set. |
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153 */ |
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154 public static final BOOperand CTRNonZero_CRTrue = new BOOperand("01000"); |
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155 |
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156 /** |
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157 * Decrement the Counter Register, then branch if the decremented value is 0 and |
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158 * the bit in the Condition Register selected by the BI field is set. |
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159 */ |
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160 public static final BOOperand CTRZero_CRTrue = new BOOperand("01010"); |
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161 |
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162 /** |
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163 * Branch if the bit in the Condition Register selected by the BI field is set |
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164 * and indicate that the branch is very likely to be taken. |
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165 */ |
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166 public static final BOOperand CRTrue_PredictTaken = new BOOperand("01111", "00011"); |
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167 |
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168 /** |
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169 * Branch if the bit in the Condition Register selected by the BI field is set |
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170 * and indicate that the branch is very likely not to be taken. |
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171 */ |
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172 public static final BOOperand CRTrue_PredictNotTaken = new BOOperand("01110", "00011"); |
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173 |
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174 /** |
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175 * Branch if the bit in the Condition Register selected by the BI field is set. |
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176 */ |
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177 public static final BOOperand CRTrue = new BOOperand("01100", CRTrue_PredictTaken, CRTrue_PredictNotTaken, "00011"); |
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178 |
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179 /** |
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180 * Decrement the Counter Register, then branch if the decremented value is 0 |
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181 * and indicate that the branch is very likely to be taken. |
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182 */ |
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183 public static final BOOperand CTRNonZero_PredictTaken = new BOOperand("11001", "01001"); |
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184 |
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185 /** |
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186 * Decrement the Counter Register, then branch if the decremented value is 0 |
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187 * and indicate that the branch is very likely not to be taken. |
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188 */ |
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189 public static final BOOperand CTRNonZero_PredictNotTaken = new BOOperand("11000", "01001"); |
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190 |
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191 /** |
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192 * Decrement the Counter Register, then branch if the decremented value is 0. |
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193 */ |
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194 public static final BOOperand CTRNonZero = new BOOperand("10000", CTRNonZero_PredictTaken, CTRNonZero_PredictNotTaken, "01001"); |
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195 |
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196 /** |
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197 * Decrement the Counter Register, then branch if the decremented value is 0 |
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198 * and indicate that the branch is very likely to be taken. |
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199 */ |
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200 public static final BOOperand CTRZero_PredictTaken = new BOOperand("11011", "01001"); |
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201 |
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202 /** |
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203 * Decrement the Counter Register, then branch if the decremented value is 0 |
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204 * and indicate that the branch is very likely not to be taken. |
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205 */ |
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206 public static final BOOperand CTRZero_PredictNotTaken = new BOOperand("11010", "01001"); |
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207 |
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208 /** |
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209 * Decrement the Counter Register, then branch if the decremented value is 0. |
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210 */ |
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211 public static final BOOperand CTRZero = new BOOperand("10010", CTRZero_PredictTaken, CTRZero_PredictNotTaken, "01001"); |
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212 |
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213 /** |
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214 * Branch always. |
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215 */ |
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216 public static final BOOperand Always = new BOOperand("10100"); |
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217 |
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218 // Checkstyle: resume constant name check |
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219 |
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220 public static final Symbolizer<BOOperand> SYMBOLIZER = Symbolizer.Static.initialize(BOOperand.class); |
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221 } |