Mercurial > hg > truffle
annotate graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64ControlFlow.java @ 5333:b1de7c9ab0e0
expanded analysis of compiled checkcast code paths
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 02 May 2012 11:31:53 +0200 |
parents | 467de393651a |
children | 80127e4a1742 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 2012, 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.oracle.graal.lir.amd64; |
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24 |
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25 import static com.oracle.max.cri.ci.CiValueUtil.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.max.asm.*; |
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30 import com.oracle.max.asm.target.amd64.*; |
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31 import com.oracle.max.asm.target.amd64.AMD64Assembler.ConditionFlag; |
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32 import com.oracle.max.cri.ci.*; |
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33 import com.oracle.max.cri.ci.CiAddress.Scale; |
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34 import com.oracle.max.cri.ci.CiTargetMethod.JumpTable; |
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35 import com.oracle.graal.graph.*; |
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36 import com.oracle.graal.lir.*; |
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37 import com.oracle.graal.lir.asm.*; |
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38 import com.oracle.graal.nodes.calc.*; |
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39 |
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40 public class AMD64ControlFlow { |
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41 |
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42 public static class ReturnOp extends AMD64LIRInstruction { |
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43 public ReturnOp(CiValue input) { |
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44 super("RETURN", LIRInstruction.NO_OPERANDS, null, new CiValue[] {input}, LIRInstruction.NO_OPERANDS, LIRInstruction.NO_OPERANDS); |
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45 } |
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46 |
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47 @Override |
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48 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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49 if (tasm.frameContext != null) { |
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50 tasm.frameContext.leave(tasm); |
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51 } |
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52 masm.ret(0); |
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53 } |
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54 |
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55 @Override |
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56 protected EnumSet<OperandFlag> flagsFor(OperandMode mode, int index) { |
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57 if (mode == OperandMode.Input && index == 0) { |
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58 return EnumSet.of(OperandFlag.Register, OperandFlag.Illegal); |
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59 } |
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60 throw GraalInternalError.shouldNotReachHere(); |
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61 } |
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62 } |
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63 |
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64 |
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65 public static class BranchOp extends AMD64LIRInstruction implements StandardOp.BranchOp { |
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66 protected Condition condition; |
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67 protected LabelRef destination; |
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68 |
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69 public BranchOp(Condition condition, LabelRef destination, LIRDebugInfo info) { |
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70 super("BRANCH", LIRInstruction.NO_OPERANDS, info, LIRInstruction.NO_OPERANDS, LIRInstruction.NO_OPERANDS, LIRInstruction.NO_OPERANDS); |
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71 this.condition = condition; |
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72 this.destination = destination; |
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73 } |
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74 |
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75 @Override |
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76 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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77 masm.jcc(intCond(condition), destination.label()); |
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78 } |
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79 |
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80 @Override |
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81 public LabelRef destination() { |
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82 return destination; |
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83 } |
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84 |
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85 @Override |
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86 public void negate(LabelRef newDestination) { |
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87 destination = newDestination; |
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88 condition = condition.negate(); |
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89 } |
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90 |
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91 @Override |
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92 public String operationString() { |
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93 return condition.operator + " [" + destination + "]"; |
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94 } |
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95 |
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96 @Override |
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97 protected EnumSet<OperandFlag> flagsFor(OperandMode mode, int index) { |
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98 throw GraalInternalError.shouldNotReachHere(); |
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99 } |
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100 } |
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101 |
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102 |
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103 public static class FloatBranchOp extends BranchOp { |
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104 protected boolean unorderedIsTrue; |
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105 |
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106 public FloatBranchOp(Condition condition, boolean unorderedIsTrue, LabelRef destination, LIRDebugInfo info) { |
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107 super(condition, destination, info); |
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108 this.unorderedIsTrue = unorderedIsTrue; |
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109 } |
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110 |
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111 @Override |
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112 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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113 floatJcc(masm, condition, unorderedIsTrue, destination.label()); |
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114 } |
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115 |
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116 @Override |
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117 public void negate(LabelRef newDestination) { |
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118 super.negate(newDestination); |
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119 unorderedIsTrue = !unorderedIsTrue; |
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120 } |
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121 |
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122 @Override |
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123 public String operationString() { |
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124 return condition.operator + " [" + destination + "]" + (unorderedIsTrue ? " unorderedIsTrue" : " unorderedIsFalse"); |
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125 } |
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126 } |
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127 |
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128 |
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129 public static class TableSwitchOp extends AMD64LIRInstruction { |
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130 private final int lowKey; |
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131 private final LabelRef defaultTarget; |
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132 private final LabelRef[] targets; |
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133 |
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134 public TableSwitchOp(final int lowKey, final LabelRef defaultTarget, final LabelRef[] targets, Variable index, Variable scratch) { |
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135 super("TABLE_SWITCH", LIRInstruction.NO_OPERANDS, null, LIRInstruction.NO_OPERANDS, new CiValue[] {index}, new CiValue[] {scratch}); |
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136 this.lowKey = lowKey; |
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137 this.defaultTarget = defaultTarget; |
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138 this.targets = targets; |
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139 } |
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140 |
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141 @Override |
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142 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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143 tableswitch(tasm, masm, lowKey, defaultTarget, targets, asIntReg(alive(0)), asLongReg(temp(0))); |
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144 } |
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145 |
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146 @Override |
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147 public String operationString() { |
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148 StringBuilder buf = new StringBuilder(super.operationString()); |
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149 buf.append("\ndefault: [").append(defaultTarget).append(']'); |
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150 int key = lowKey; |
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151 for (LabelRef l : targets) { |
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152 buf.append("\ncase ").append(key).append(": [").append(l).append(']'); |
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153 key++; |
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154 } |
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155 return buf.toString(); |
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156 } |
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157 |
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158 @Override |
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159 protected EnumSet<OperandFlag> flagsFor(OperandMode mode, int index) { |
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160 if (mode == OperandMode.Alive && index == 0) { |
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161 return EnumSet.of(OperandFlag.Register); |
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162 } else if (mode == OperandMode.Temp && index == 0) { |
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163 return EnumSet.of(OperandFlag.Register); |
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164 } |
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165 throw GraalInternalError.shouldNotReachHere(); |
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166 } |
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167 } |
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168 |
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169 |
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170 public static class CondMoveOp extends AMD64LIRInstruction { |
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171 private final Condition condition; |
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172 |
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173 public CondMoveOp(Variable result, Condition condition, Variable trueValue, CiValue falseValue) { |
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174 super("CMOVE", new CiValue[] {result}, null, new CiValue[] {falseValue}, new CiValue[] {trueValue}, LIRInstruction.NO_OPERANDS); |
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175 this.condition = condition; |
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176 } |
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177 |
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178 @Override |
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179 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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180 cmove(tasm, masm, output(0), false, condition, false, alive(0), input(0)); |
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181 } |
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182 |
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183 @Override |
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184 protected EnumSet<OperandFlag> flagsFor(OperandMode mode, int index) { |
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185 if (mode == OperandMode.Input && index == 0) { |
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186 return EnumSet.of(OperandFlag.Register, OperandFlag.Stack, OperandFlag.Constant); |
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187 } else if (mode == OperandMode.Alive && index == 0) { |
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188 return EnumSet.of(OperandFlag.Register); |
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189 } else if (mode == OperandMode.Output && index == 0) { |
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190 return EnumSet.of(OperandFlag.Register, OperandFlag.RegisterHint); |
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191 } |
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192 throw GraalInternalError.shouldNotReachHere(); |
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193 } |
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194 |
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195 @Override |
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196 public String operationString() { |
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197 return condition.toString() + " " + super.operationString(); |
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198 } |
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199 } |
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200 |
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201 |
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202 public static class FloatCondMoveOp extends AMD64LIRInstruction { |
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203 private final Condition condition; |
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204 private final boolean unorderedIsTrue; |
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205 |
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206 public FloatCondMoveOp(Variable result, Condition condition, boolean unorderedIsTrue, Variable trueValue, Variable falseValue) { |
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207 super("FLOAT_CMOVE", new CiValue[] {result}, null, LIRInstruction.NO_OPERANDS, new CiValue[] {trueValue, falseValue}, LIRInstruction.NO_OPERANDS); |
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208 this.condition = condition; |
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209 this.unorderedIsTrue = unorderedIsTrue; |
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210 } |
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211 |
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212 @Override |
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213 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { |
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214 cmove(tasm, masm, output(0), true, condition, unorderedIsTrue, alive(0), alive(1)); |
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215 } |
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216 |
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217 @Override |
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218 public String operationString() { |
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219 return condition.toString() + " unordered=" + unorderedIsTrue + " " + super.operationString(); |
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220 } |
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221 |
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222 @Override |
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223 protected EnumSet<OperandFlag> flagsFor(OperandMode mode, int index) { |
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224 if (mode == OperandMode.Alive && index == 0) { |
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225 return EnumSet.of(OperandFlag.Register); |
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226 } else if (mode == OperandMode.Alive && index == 1) { |
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227 return EnumSet.of(OperandFlag.Register); |
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228 } else if (mode == OperandMode.Output && index == 0) { |
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229 return EnumSet.of(OperandFlag.Register); |
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230 } |
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231 throw GraalInternalError.shouldNotReachHere(); |
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232 } |
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233 } |
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234 |
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235 |
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236 private static void tableswitch(TargetMethodAssembler tasm, AMD64MacroAssembler masm, int lowKey, LabelRef defaultTarget, LabelRef[] targets, CiRegister value, CiRegister scratch) { |
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237 Buffer buf = masm.codeBuffer; |
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238 // Compare index against jump table bounds |
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239 int highKey = lowKey + targets.length - 1; |
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240 if (lowKey != 0) { |
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241 // subtract the low value from the switch value |
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242 masm.subl(value, lowKey); |
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243 masm.cmpl(value, highKey - lowKey); |
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244 } else { |
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245 masm.cmpl(value, highKey); |
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246 } |
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247 |
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248 // Jump to default target if index is not within the jump table |
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249 masm.jcc(ConditionFlag.above, defaultTarget.label()); |
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250 |
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251 // Set scratch to address of jump table |
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252 int leaPos = buf.position(); |
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253 masm.leaq(scratch, new CiAddress(tasm.target.wordKind, AMD64.rip.asValue(), 0)); |
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254 int afterLea = buf.position(); |
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255 |
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256 // Load jump table entry into scratch and jump to it |
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257 masm.movslq(value, new CiAddress(CiKind.Int, scratch.asValue(), value.asValue(), Scale.Times4, 0)); |
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258 masm.addq(scratch, value); |
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259 masm.jmp(scratch); |
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260 |
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261 // Inserting padding so that jump table address is 4-byte aligned |
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262 if ((buf.position() & 0x3) != 0) { |
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263 masm.nop(4 - (buf.position() & 0x3)); |
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264 } |
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265 |
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266 // Patch LEA instruction above now that we know the position of the jump table |
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267 int jumpTablePos = buf.position(); |
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268 buf.setPosition(leaPos); |
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269 masm.leaq(scratch, new CiAddress(tasm.target.wordKind, AMD64.rip.asValue(), jumpTablePos - afterLea)); |
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270 buf.setPosition(jumpTablePos); |
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271 |
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272 // Emit jump table entries |
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273 for (LabelRef target : targets) { |
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274 Label label = target.label(); |
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275 int offsetToJumpTableBase = buf.position() - jumpTablePos; |
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276 if (label.isBound()) { |
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277 int imm32 = label.position() - jumpTablePos; |
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278 buf.emitInt(imm32); |
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279 } else { |
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280 label.addPatchAt(buf.position()); |
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281 |
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282 buf.emitByte(0); // psuedo-opcode for jump table entry |
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283 buf.emitShort(offsetToJumpTableBase); |
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284 buf.emitByte(0); // padding to make jump table entry 4 bytes wide |
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285 } |
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286 } |
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287 |
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288 JumpTable jt = new JumpTable(jumpTablePos, lowKey, highKey, 4); |
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289 tasm.targetMethod.addAnnotation(jt); |
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290 } |
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291 |
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292 private static void floatJcc(AMD64MacroAssembler masm, Condition condition, boolean unorderedIsTrue, Label label) { |
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293 ConditionFlag cond = floatCond(condition); |
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294 Label endLabel = new Label(); |
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295 if (unorderedIsTrue && !trueOnUnordered(cond)) { |
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296 masm.jcc(ConditionFlag.parity, label); |
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297 } else if (!unorderedIsTrue && trueOnUnordered(cond)) { |
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298 masm.jcc(ConditionFlag.parity, endLabel); |
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299 } |
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300 masm.jcc(cond, label); |
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301 masm.bind(endLabel); |
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302 } |
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303 |
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304 private static void cmove(TargetMethodAssembler tasm, AMD64MacroAssembler masm, CiValue result, boolean isFloat, Condition condition, boolean unorderedIsTrue, CiValue trueValue, CiValue falseValue) { |
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305 ConditionFlag cond = isFloat ? floatCond(condition) : intCond(condition); |
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306 // check that we don't overwrite an input operand before it is used. |
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307 assert !result.equals(trueValue); |
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308 |
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309 AMD64Move.move(tasm, masm, result, falseValue); |
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310 cmove(tasm, masm, result, cond, trueValue); |
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311 |
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312 if (isFloat) { |
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313 if (unorderedIsTrue && !trueOnUnordered(cond)) { |
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314 cmove(tasm, masm, result, ConditionFlag.parity, trueValue); |
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315 } else if (!unorderedIsTrue && trueOnUnordered(cond)) { |
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316 cmove(tasm, masm, result, ConditionFlag.parity, falseValue); |
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317 } |
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318 } |
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319 } |
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320 |
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321 private static void cmove(TargetMethodAssembler tasm, AMD64MacroAssembler masm, CiValue result, ConditionFlag cond, CiValue other) { |
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322 if (isRegister(other)) { |
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323 assert asRegister(other) != asRegister(result) : "other already overwritten by previous move"; |
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324 switch (other.kind) { |
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325 case Int: masm.cmovl(cond, asRegister(result), asRegister(other)); break; |
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326 case Long: masm.cmovq(cond, asRegister(result), asRegister(other)); break; |
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327 default: throw GraalInternalError.shouldNotReachHere(); |
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328 } |
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329 } else { |
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330 switch (other.kind) { |
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331 case Int: masm.cmovl(cond, asRegister(result), tasm.asAddress(other)); break; |
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332 case Long: masm.cmovq(cond, asRegister(result), tasm.asAddress(other)); break; |
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333 default: throw GraalInternalError.shouldNotReachHere(); |
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334 } |
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335 } |
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336 } |
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337 |
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338 private static ConditionFlag intCond(Condition cond) { |
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339 switch (cond) { |
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340 case EQ: return ConditionFlag.equal; |
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341 case NE: return ConditionFlag.notEqual; |
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342 case LT: return ConditionFlag.less; |
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343 case LE: return ConditionFlag.lessEqual; |
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344 case GE: return ConditionFlag.greaterEqual; |
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345 case GT: return ConditionFlag.greater; |
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346 case BE: return ConditionFlag.belowEqual; |
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347 case AE: return ConditionFlag.aboveEqual; |
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348 case AT: return ConditionFlag.above; |
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349 case BT: return ConditionFlag.below; |
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350 case OF: return ConditionFlag.overflow; |
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351 case NOF: return ConditionFlag.noOverflow; |
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352 default: throw GraalInternalError.shouldNotReachHere(); |
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353 } |
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354 } |
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355 |
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356 private static ConditionFlag floatCond(Condition cond) { |
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357 switch (cond) { |
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358 case EQ: return ConditionFlag.equal; |
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359 case NE: return ConditionFlag.notEqual; |
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360 case LT: return ConditionFlag.below; |
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361 case LE: return ConditionFlag.belowEqual; |
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362 case GE: return ConditionFlag.aboveEqual; |
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363 case GT: return ConditionFlag.above; |
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364 default: throw GraalInternalError.shouldNotReachHere(); |
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365 } |
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366 } |
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367 |
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368 private static boolean trueOnUnordered(ConditionFlag condition) { |
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369 switch(condition) { |
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370 case aboveEqual: |
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371 case notEqual: |
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372 case above: |
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373 case less: |
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374 case overflow: |
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375 return false; |
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376 case equal: |
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377 case belowEqual: |
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378 case below: |
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379 case greaterEqual: |
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380 case noOverflow: |
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381 return true; |
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382 default: |
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383 throw GraalInternalError.shouldNotReachHere(); |
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384 } |
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385 } |
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386 } |