annotate include/llvm/Analysis/SparsePropagation.h @ 83:60c9769439b8

LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900 (2015-02-18)
parents 54457678186b
children afa8332a0e37
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1 //===- SparsePropagation.h - Sparse Conditional Property Propagation ------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements an abstract sparse conditional propagation algorithm,
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11 // modeled after SCCP, but with a customizable lattice function.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_SPARSEPROPAGATION_H
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16 #define LLVM_ANALYSIS_SPARSEPROPAGATION_H
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17
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18 #include "llvm/ADT/DenseMap.h"
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19 #include "llvm/ADT/SmallPtrSet.h"
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20 #include <set>
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21 #include <vector>
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22
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23 namespace llvm {
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24 class Value;
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25 class Constant;
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26 class Argument;
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27 class Instruction;
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28 class PHINode;
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29 class TerminatorInst;
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30 class BasicBlock;
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31 class Function;
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32 class SparseSolver;
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33 class raw_ostream;
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34
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35 template<typename T> class SmallVectorImpl;
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36
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37 /// AbstractLatticeFunction - This class is implemented by the dataflow instance
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38 /// to specify what the lattice values are and how they handle merges etc.
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39 /// This gives the client the power to compute lattice values from instructions,
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40 /// constants, etc. The requirement is that lattice values must all fit into
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41 /// a void*. If a void* is not sufficient, the implementation should use this
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42 /// pointer to be a pointer into a uniquing set or something.
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43 ///
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44 class AbstractLatticeFunction {
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45 public:
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46 typedef void *LatticeVal;
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47 private:
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48 LatticeVal UndefVal, OverdefinedVal, UntrackedVal;
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49 public:
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50 AbstractLatticeFunction(LatticeVal undefVal, LatticeVal overdefinedVal,
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51 LatticeVal untrackedVal) {
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52 UndefVal = undefVal;
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53 OverdefinedVal = overdefinedVal;
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54 UntrackedVal = untrackedVal;
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55 }
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56 virtual ~AbstractLatticeFunction();
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57
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58 LatticeVal getUndefVal() const { return UndefVal; }
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59 LatticeVal getOverdefinedVal() const { return OverdefinedVal; }
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60 LatticeVal getUntrackedVal() const { return UntrackedVal; }
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61
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62 /// IsUntrackedValue - If the specified Value is something that is obviously
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63 /// uninteresting to the analysis (and would always return UntrackedVal),
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64 /// this function can return true to avoid pointless work.
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65 virtual bool IsUntrackedValue(Value *V) {
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66 return false;
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67 }
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68
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69 /// ComputeConstant - Given a constant value, compute and return a lattice
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70 /// value corresponding to the specified constant.
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71 virtual LatticeVal ComputeConstant(Constant *C) {
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72 return getOverdefinedVal(); // always safe
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73 }
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74
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75 /// IsSpecialCasedPHI - Given a PHI node, determine whether this PHI node is
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76 /// one that the we want to handle through ComputeInstructionState.
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77 virtual bool IsSpecialCasedPHI(PHINode *PN) {
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78 return false;
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79 }
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80
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81 /// GetConstant - If the specified lattice value is representable as an LLVM
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82 /// constant value, return it. Otherwise return null. The returned value
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83 /// must be in the same LLVM type as Val.
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84 virtual Constant *GetConstant(LatticeVal LV, Value *Val, SparseSolver &SS) {
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85 return nullptr;
0
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86 }
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87
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88 /// ComputeArgument - Given a formal argument value, compute and return a
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89 /// lattice value corresponding to the specified argument.
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90 virtual LatticeVal ComputeArgument(Argument *I) {
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91 return getOverdefinedVal(); // always safe
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92 }
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93
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94 /// MergeValues - Compute and return the merge of the two specified lattice
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95 /// values. Merging should only move one direction down the lattice to
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96 /// guarantee convergence (toward overdefined).
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97 virtual LatticeVal MergeValues(LatticeVal X, LatticeVal Y) {
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98 return getOverdefinedVal(); // always safe, never useful.
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99 }
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100
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101 /// ComputeInstructionState - Given an instruction and a vector of its operand
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102 /// values, compute the result value of the instruction.
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103 virtual LatticeVal ComputeInstructionState(Instruction &I, SparseSolver &SS) {
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104 return getOverdefinedVal(); // always safe, never useful.
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105 }
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106
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107 /// PrintValue - Render the specified lattice value to the specified stream.
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108 virtual void PrintValue(LatticeVal V, raw_ostream &OS);
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109 };
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110
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111
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112 /// SparseSolver - This class is a general purpose solver for Sparse Conditional
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113 /// Propagation with a programmable lattice function.
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114 ///
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115 class SparseSolver {
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116 typedef AbstractLatticeFunction::LatticeVal LatticeVal;
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117
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118 /// LatticeFunc - This is the object that knows the lattice and how to do
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119 /// compute transfer functions.
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120 AbstractLatticeFunction *LatticeFunc;
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121
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122 DenseMap<Value*, LatticeVal> ValueState; // The state each value is in.
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123 SmallPtrSet<BasicBlock*, 16> BBExecutable; // The bbs that are executable.
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124
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125 std::vector<Instruction*> InstWorkList; // Worklist of insts to process.
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126
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127 std::vector<BasicBlock*> BBWorkList; // The BasicBlock work list
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128
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129 /// KnownFeasibleEdges - Entries in this set are edges which have already had
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130 /// PHI nodes retriggered.
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131 typedef std::pair<BasicBlock*,BasicBlock*> Edge;
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132 std::set<Edge> KnownFeasibleEdges;
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133
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134 SparseSolver(const SparseSolver&) = delete;
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135 void operator=(const SparseSolver&) = delete;
0
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136 public:
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137 explicit SparseSolver(AbstractLatticeFunction *Lattice)
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138 : LatticeFunc(Lattice) {}
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139 ~SparseSolver() {
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140 delete LatticeFunc;
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141 }
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142
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143 /// Solve - Solve for constants and executable blocks.
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144 ///
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145 void Solve(Function &F);
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146
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147 void Print(Function &F, raw_ostream &OS) const;
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148
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149 /// getLatticeState - Return the LatticeVal object that corresponds to the
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150 /// value. If an value is not in the map, it is returned as untracked,
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151 /// unlike the getOrInitValueState method.
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152 LatticeVal getLatticeState(Value *V) const {
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153 DenseMap<Value*, LatticeVal>::const_iterator I = ValueState.find(V);
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154 return I != ValueState.end() ? I->second : LatticeFunc->getUntrackedVal();
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155 }
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156
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157 /// getOrInitValueState - Return the LatticeVal object that corresponds to the
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158 /// value, initializing the value's state if it hasn't been entered into the
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159 /// map yet. This function is necessary because not all values should start
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160 /// out in the underdefined state... Arguments should be overdefined, and
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161 /// constants should be marked as constants.
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162 ///
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163 LatticeVal getOrInitValueState(Value *V);
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164
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165 /// isEdgeFeasible - Return true if the control flow edge from the 'From'
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166 /// basic block to the 'To' basic block is currently feasible. If
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167 /// AggressiveUndef is true, then this treats values with unknown lattice
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168 /// values as undefined. This is generally only useful when solving the
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169 /// lattice, not when querying it.
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170 bool isEdgeFeasible(BasicBlock *From, BasicBlock *To,
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171 bool AggressiveUndef = false);
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172
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173 /// isBlockExecutable - Return true if there are any known feasible
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174 /// edges into the basic block. This is generally only useful when
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175 /// querying the lattice.
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176 bool isBlockExecutable(BasicBlock *BB) const {
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177 return BBExecutable.count(BB);
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178 }
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179
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180 private:
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181 /// UpdateState - When the state for some instruction is potentially updated,
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182 /// this function notices and adds I to the worklist if needed.
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183 void UpdateState(Instruction &Inst, LatticeVal V);
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184
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185 /// MarkBlockExecutable - This method can be used by clients to mark all of
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186 /// the blocks that are known to be intrinsically live in the processed unit.
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187 void MarkBlockExecutable(BasicBlock *BB);
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188
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189 /// markEdgeExecutable - Mark a basic block as executable, adding it to the BB
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190 /// work list if it is not already executable.
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191 void markEdgeExecutable(BasicBlock *Source, BasicBlock *Dest);
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192
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193 /// getFeasibleSuccessors - Return a vector of booleans to indicate which
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194 /// successors are reachable from a given terminator instruction.
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195 void getFeasibleSuccessors(TerminatorInst &TI, SmallVectorImpl<bool> &Succs,
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196 bool AggressiveUndef);
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197
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198 void visitInst(Instruction &I);
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199 void visitPHINode(PHINode &I);
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200 void visitTerminatorInst(TerminatorInst &TI);
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201
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202 };
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203
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204 } // end namespace llvm
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205
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206 #endif // LLVM_ANALYSIS_SPARSEPROPAGATION_H