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annotate include/llvm/Analysis/IVUsers.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===- llvm/Analysis/IVUsers.h - Induction Variable Users -------*- C++ -*-===//
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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 bookkeeping for "interesting" users of expressions
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11 // computed from induction variables.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_IVUSERS_H
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16 #define LLVM_ANALYSIS_IVUSERS_H
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17
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18 #include "llvm/Analysis/LoopPass.h"
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19 #include "llvm/Analysis/ScalarEvolutionNormalization.h"
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20 #include "llvm/IR/ValueHandle.h"
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21
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22 namespace llvm {
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23
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24 class DominatorTree;
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25 class Instruction;
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26 class Value;
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27 class ScalarEvolution;
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28 class SCEV;
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29 class IVUsers;
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30 class DataLayout;
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31
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32 /// IVStrideUse - Keep track of one use of a strided induction variable.
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33 /// The Expr member keeps track of the expression, User is the actual user
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34 /// instruction of the operand, and 'OperandValToReplace' is the operand of
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35 /// the User that is the use.
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36 class IVStrideUse : public CallbackVH, public ilist_node<IVStrideUse> {
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37 friend class IVUsers;
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38 public:
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39 IVStrideUse(IVUsers *P, Instruction* U, Value *O)
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40 : CallbackVH(U), Parent(P), OperandValToReplace(O) {
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41 }
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42
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43 /// getUser - Return the user instruction for this use.
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44 Instruction *getUser() const {
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45 return cast<Instruction>(getValPtr());
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46 }
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47
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48 /// setUser - Assign a new user instruction for this use.
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49 void setUser(Instruction *NewUser) {
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50 setValPtr(NewUser);
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51 }
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52
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53 /// getOperandValToReplace - Return the Value of the operand in the user
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54 /// instruction that this IVStrideUse is representing.
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55 Value *getOperandValToReplace() const {
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56 return OperandValToReplace;
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57 }
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58
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59 /// setOperandValToReplace - Assign a new Value as the operand value
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60 /// to replace.
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61 void setOperandValToReplace(Value *Op) {
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62 OperandValToReplace = Op;
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63 }
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64
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65 /// getPostIncLoops - Return the set of loops for which the expression has
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66 /// been adjusted to use post-inc mode.
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67 const PostIncLoopSet &getPostIncLoops() const {
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68 return PostIncLoops;
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69 }
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70
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71 /// transformToPostInc - Transform the expression to post-inc form for the
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72 /// given loop.
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73 void transformToPostInc(const Loop *L);
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74
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75 private:
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76 /// Parent - a pointer to the IVUsers that owns this IVStrideUse.
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77 IVUsers *Parent;
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78
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79 /// OperandValToReplace - The Value of the operand in the user instruction
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80 /// that this IVStrideUse is representing.
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81 WeakVH OperandValToReplace;
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82
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83 /// PostIncLoops - The set of loops for which Expr has been adjusted to
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84 /// use post-inc mode. This corresponds with SCEVExpander's post-inc concept.
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85 PostIncLoopSet PostIncLoops;
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86
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87 /// Deleted - Implementation of CallbackVH virtual function to
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88 /// receive notification when the User is deleted.
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89 void deleted() override;
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90 };
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91
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92 template<> struct ilist_traits<IVStrideUse>
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93 : public ilist_default_traits<IVStrideUse> {
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94 // createSentinel is used to get hold of a node that marks the end of
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95 // the list...
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96 // The sentinel is relative to this instance, so we use a non-static
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97 // method.
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98 IVStrideUse *createSentinel() const {
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99 // since i(p)lists always publicly derive from the corresponding
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100 // traits, placing a data member in this class will augment i(p)list.
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101 // But since the NodeTy is expected to publicly derive from
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102 // ilist_node<NodeTy>, there is a legal viable downcast from it
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103 // to NodeTy. We use this trick to superpose i(p)list with a "ghostly"
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104 // NodeTy, which becomes the sentinel. Dereferencing the sentinel is
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105 // forbidden (save the ilist_node<NodeTy>) so no one will ever notice
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106 // the superposition.
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107 return static_cast<IVStrideUse*>(&Sentinel);
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108 }
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109 static void destroySentinel(IVStrideUse*) {}
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110
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111 IVStrideUse *provideInitialHead() const { return createSentinel(); }
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112 IVStrideUse *ensureHead(IVStrideUse*) const { return createSentinel(); }
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113 static void noteHead(IVStrideUse*, IVStrideUse*) {}
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114
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115 private:
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116 mutable ilist_node<IVStrideUse> Sentinel;
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117 };
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118
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119 class IVUsers : public LoopPass {
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120 friend class IVStrideUse;
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121 Loop *L;
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122 LoopInfo *LI;
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123 DominatorTree *DT;
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124 ScalarEvolution *SE;
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125 const DataLayout *DL;
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126 SmallPtrSet<Instruction*,16> Processed;
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127
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128 /// IVUses - A list of all tracked IV uses of induction variable expressions
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129 /// we are interested in.
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130 ilist<IVStrideUse> IVUses;
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131
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132 void getAnalysisUsage(AnalysisUsage &AU) const override;
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133
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134 bool runOnLoop(Loop *L, LPPassManager &LPM) override;
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135
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136 void releaseMemory() override;
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137
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138 public:
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139 static char ID; // Pass ID, replacement for typeid
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140 IVUsers();
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141
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142 Loop *getLoop() const { return L; }
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143
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144 /// AddUsersIfInteresting - Inspect the specified Instruction. If it is a
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145 /// reducible SCEV, recursively add its users to the IVUsesByStride set and
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146 /// return true. Otherwise, return false.
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147 bool AddUsersIfInteresting(Instruction *I);
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148
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149 IVStrideUse &AddUser(Instruction *User, Value *Operand);
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150
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151 /// getReplacementExpr - Return a SCEV expression which computes the
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152 /// value of the OperandValToReplace of the given IVStrideUse.
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153 const SCEV *getReplacementExpr(const IVStrideUse &IU) const;
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154
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155 /// getExpr - Return the expression for the use.
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156 const SCEV *getExpr(const IVStrideUse &IU) const;
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157
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158 const SCEV *getStride(const IVStrideUse &IU, const Loop *L) const;
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159
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160 typedef ilist<IVStrideUse>::iterator iterator;
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161 typedef ilist<IVStrideUse>::const_iterator const_iterator;
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162 iterator begin() { return IVUses.begin(); }
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163 iterator end() { return IVUses.end(); }
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164 const_iterator begin() const { return IVUses.begin(); }
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165 const_iterator end() const { return IVUses.end(); }
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166 bool empty() const { return IVUses.empty(); }
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167
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168 bool isIVUserOrOperand(Instruction *Inst) const {
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169 return Processed.count(Inst);
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170 }
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171
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172 void print(raw_ostream &OS, const Module* = nullptr) const override;
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173
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174 /// dump - This method is used for debugging.
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175 void dump() const;
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176 protected:
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177 bool AddUsersImpl(Instruction *I, SmallPtrSetImpl<Loop*> &SimpleLoopNests);
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178 };
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179
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180 Pass *createIVUsersPass();
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181
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182 }
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183
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184 #endif