Mercurial > hg > Members > tobaru > cbc > CbC_llvm
annotate lib/Analysis/AliasAnalysisEvaluator.cpp @ 20:a5b470e0d09d
set FastCC(Calling Convention) when the function is code segment and set GuaranteedTailCallOpt. but llvm still output not jmp but call...
author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Sun, 06 Oct 2013 18:16:15 +0900 |
parents | 9ad51c7bc036 |
children | 54457678186b |
rev | line source |
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1 //===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===// |
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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 a simple N^2 alias analysis accuracy evaluator. |
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11 // Basically, for each function in the program, it simply queries to see how the |
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12 // alias analysis implementation answers alias queries between each pair of |
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13 // pointers in the function. |
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14 // |
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15 // This is inspired and adapted from code by: Naveen Neelakantam, Francesco |
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16 // Spadini, and Wojciech Stryjewski. |
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17 // |
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18 //===----------------------------------------------------------------------===// |
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19 |
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20 #include "llvm/Analysis/Passes.h" |
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21 #include "llvm/ADT/SetVector.h" |
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22 #include "llvm/Analysis/AliasAnalysis.h" |
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23 #include "llvm/Assembly/Writer.h" |
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24 #include "llvm/IR/Constants.h" |
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25 #include "llvm/IR/DerivedTypes.h" |
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26 #include "llvm/IR/Function.h" |
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27 #include "llvm/IR/Instructions.h" |
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28 #include "llvm/Pass.h" |
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29 #include "llvm/Support/CommandLine.h" |
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30 #include "llvm/Support/Debug.h" |
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31 #include "llvm/Support/InstIterator.h" |
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32 #include "llvm/Support/raw_ostream.h" |
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33 using namespace llvm; |
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34 |
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35 static cl::opt<bool> PrintAll("print-all-alias-modref-info", cl::ReallyHidden); |
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36 |
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37 static cl::opt<bool> PrintNoAlias("print-no-aliases", cl::ReallyHidden); |
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38 static cl::opt<bool> PrintMayAlias("print-may-aliases", cl::ReallyHidden); |
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39 static cl::opt<bool> PrintPartialAlias("print-partial-aliases", cl::ReallyHidden); |
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40 static cl::opt<bool> PrintMustAlias("print-must-aliases", cl::ReallyHidden); |
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41 |
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42 static cl::opt<bool> PrintNoModRef("print-no-modref", cl::ReallyHidden); |
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43 static cl::opt<bool> PrintMod("print-mod", cl::ReallyHidden); |
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44 static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden); |
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45 static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden); |
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46 |
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47 static cl::opt<bool> EvalTBAA("evaluate-tbaa", cl::ReallyHidden); |
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48 |
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49 namespace { |
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50 class AAEval : public FunctionPass { |
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51 unsigned NoAlias, MayAlias, PartialAlias, MustAlias; |
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52 unsigned NoModRef, Mod, Ref, ModRef; |
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53 |
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54 public: |
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55 static char ID; // Pass identification, replacement for typeid |
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56 AAEval() : FunctionPass(ID) { |
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57 initializeAAEvalPass(*PassRegistry::getPassRegistry()); |
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58 } |
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59 |
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60 virtual void getAnalysisUsage(AnalysisUsage &AU) const { |
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61 AU.addRequired<AliasAnalysis>(); |
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62 AU.setPreservesAll(); |
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63 } |
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64 |
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65 bool doInitialization(Module &M) { |
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66 NoAlias = MayAlias = PartialAlias = MustAlias = 0; |
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67 NoModRef = Mod = Ref = ModRef = 0; |
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68 |
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69 if (PrintAll) { |
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70 PrintNoAlias = PrintMayAlias = true; |
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71 PrintPartialAlias = PrintMustAlias = true; |
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72 PrintNoModRef = PrintMod = PrintRef = PrintModRef = true; |
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73 } |
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74 return false; |
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75 } |
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76 |
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77 bool runOnFunction(Function &F); |
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78 bool doFinalization(Module &M); |
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79 }; |
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80 } |
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81 |
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82 char AAEval::ID = 0; |
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83 INITIALIZE_PASS_BEGIN(AAEval, "aa-eval", |
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84 "Exhaustive Alias Analysis Precision Evaluator", false, true) |
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85 INITIALIZE_AG_DEPENDENCY(AliasAnalysis) |
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86 INITIALIZE_PASS_END(AAEval, "aa-eval", |
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87 "Exhaustive Alias Analysis Precision Evaluator", false, true) |
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88 |
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89 FunctionPass *llvm::createAAEvalPass() { return new AAEval(); } |
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90 |
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91 static void PrintResults(const char *Msg, bool P, const Value *V1, |
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92 const Value *V2, const Module *M) { |
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93 if (P) { |
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94 std::string o1, o2; |
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95 { |
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96 raw_string_ostream os1(o1), os2(o2); |
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97 WriteAsOperand(os1, V1, true, M); |
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98 WriteAsOperand(os2, V2, true, M); |
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99 } |
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100 |
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101 if (o2 < o1) |
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102 std::swap(o1, o2); |
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103 errs() << " " << Msg << ":\t" |
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104 << o1 << ", " |
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105 << o2 << "\n"; |
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106 } |
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107 } |
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108 |
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109 static inline void |
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110 PrintModRefResults(const char *Msg, bool P, Instruction *I, Value *Ptr, |
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111 Module *M) { |
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112 if (P) { |
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113 errs() << " " << Msg << ": Ptr: "; |
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114 WriteAsOperand(errs(), Ptr, true, M); |
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115 errs() << "\t<->" << *I << '\n'; |
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116 } |
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117 } |
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118 |
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119 static inline void |
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120 PrintModRefResults(const char *Msg, bool P, CallSite CSA, CallSite CSB, |
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121 Module *M) { |
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122 if (P) { |
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123 errs() << " " << Msg << ": " << *CSA.getInstruction() |
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124 << " <-> " << *CSB.getInstruction() << '\n'; |
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125 } |
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126 } |
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127 |
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128 static inline void |
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129 PrintLoadStoreResults(const char *Msg, bool P, const Value *V1, |
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130 const Value *V2, const Module *M) { |
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131 if (P) { |
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132 errs() << " " << Msg << ": " << *V1 |
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133 << " <-> " << *V2 << '\n'; |
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134 } |
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135 } |
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136 |
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137 static inline bool isInterestingPointer(Value *V) { |
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138 return V->getType()->isPointerTy() |
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139 && !isa<ConstantPointerNull>(V); |
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140 } |
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141 |
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142 bool AAEval::runOnFunction(Function &F) { |
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143 AliasAnalysis &AA = getAnalysis<AliasAnalysis>(); |
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144 |
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145 SetVector<Value *> Pointers; |
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146 SetVector<CallSite> CallSites; |
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147 SetVector<Value *> Loads; |
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148 SetVector<Value *> Stores; |
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149 |
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150 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) |
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151 if (I->getType()->isPointerTy()) // Add all pointer arguments. |
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152 Pointers.insert(I); |
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153 |
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154 for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) { |
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155 if (I->getType()->isPointerTy()) // Add all pointer instructions. |
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156 Pointers.insert(&*I); |
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157 if (EvalTBAA && isa<LoadInst>(&*I)) |
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158 Loads.insert(&*I); |
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159 if (EvalTBAA && isa<StoreInst>(&*I)) |
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160 Stores.insert(&*I); |
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161 Instruction &Inst = *I; |
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162 if (CallSite CS = cast<Value>(&Inst)) { |
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163 Value *Callee = CS.getCalledValue(); |
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164 // Skip actual functions for direct function calls. |
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165 if (!isa<Function>(Callee) && isInterestingPointer(Callee)) |
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166 Pointers.insert(Callee); |
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167 // Consider formals. |
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168 for (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end(); |
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169 AI != AE; ++AI) |
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170 if (isInterestingPointer(*AI)) |
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171 Pointers.insert(*AI); |
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172 CallSites.insert(CS); |
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173 } else { |
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174 // Consider all operands. |
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175 for (Instruction::op_iterator OI = Inst.op_begin(), OE = Inst.op_end(); |
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176 OI != OE; ++OI) |
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177 if (isInterestingPointer(*OI)) |
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178 Pointers.insert(*OI); |
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179 } |
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180 } |
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181 |
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182 if (PrintNoAlias || PrintMayAlias || PrintPartialAlias || PrintMustAlias || |
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183 PrintNoModRef || PrintMod || PrintRef || PrintModRef) |
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184 errs() << "Function: " << F.getName() << ": " << Pointers.size() |
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185 << " pointers, " << CallSites.size() << " call sites\n"; |
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186 |
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187 // iterate over the worklist, and run the full (n^2)/2 disambiguations |
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188 for (SetVector<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end(); |
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189 I1 != E; ++I1) { |
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190 uint64_t I1Size = AliasAnalysis::UnknownSize; |
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191 Type *I1ElTy = cast<PointerType>((*I1)->getType())->getElementType(); |
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192 if (I1ElTy->isSized()) I1Size = AA.getTypeStoreSize(I1ElTy); |
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193 |
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194 for (SetVector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) { |
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195 uint64_t I2Size = AliasAnalysis::UnknownSize; |
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196 Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType(); |
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197 if (I2ElTy->isSized()) I2Size = AA.getTypeStoreSize(I2ElTy); |
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198 |
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199 switch (AA.alias(*I1, I1Size, *I2, I2Size)) { |
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200 case AliasAnalysis::NoAlias: |
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201 PrintResults("NoAlias", PrintNoAlias, *I1, *I2, F.getParent()); |
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202 ++NoAlias; break; |
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203 case AliasAnalysis::MayAlias: |
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204 PrintResults("MayAlias", PrintMayAlias, *I1, *I2, F.getParent()); |
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205 ++MayAlias; break; |
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206 case AliasAnalysis::PartialAlias: |
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207 PrintResults("PartialAlias", PrintPartialAlias, *I1, *I2, |
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208 F.getParent()); |
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209 ++PartialAlias; break; |
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210 case AliasAnalysis::MustAlias: |
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211 PrintResults("MustAlias", PrintMustAlias, *I1, *I2, F.getParent()); |
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212 ++MustAlias; break; |
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213 } |
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214 } |
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215 } |
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216 |
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217 if (EvalTBAA) { |
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218 // iterate over all pairs of load, store |
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219 for (SetVector<Value *>::iterator I1 = Loads.begin(), E = Loads.end(); |
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220 I1 != E; ++I1) { |
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221 for (SetVector<Value *>::iterator I2 = Stores.begin(), E2 = Stores.end(); |
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222 I2 != E2; ++I2) { |
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223 switch (AA.alias(AA.getLocation(cast<LoadInst>(*I1)), |
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224 AA.getLocation(cast<StoreInst>(*I2)))) { |
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225 case AliasAnalysis::NoAlias: |
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226 PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2, |
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227 F.getParent()); |
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228 ++NoAlias; break; |
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229 case AliasAnalysis::MayAlias: |
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230 PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2, |
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231 F.getParent()); |
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232 ++MayAlias; break; |
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233 case AliasAnalysis::PartialAlias: |
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234 PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2, |
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235 F.getParent()); |
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236 ++PartialAlias; break; |
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237 case AliasAnalysis::MustAlias: |
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238 PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2, |
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239 F.getParent()); |
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240 ++MustAlias; break; |
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241 } |
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242 } |
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243 } |
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244 |
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245 // iterate over all pairs of store, store |
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246 for (SetVector<Value *>::iterator I1 = Stores.begin(), E = Stores.end(); |
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247 I1 != E; ++I1) { |
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248 for (SetVector<Value *>::iterator I2 = Stores.begin(); I2 != I1; ++I2) { |
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249 switch (AA.alias(AA.getLocation(cast<StoreInst>(*I1)), |
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250 AA.getLocation(cast<StoreInst>(*I2)))) { |
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251 case AliasAnalysis::NoAlias: |
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252 PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2, |
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253 F.getParent()); |
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254 ++NoAlias; break; |
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255 case AliasAnalysis::MayAlias: |
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256 PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2, |
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257 F.getParent()); |
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258 ++MayAlias; break; |
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259 case AliasAnalysis::PartialAlias: |
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260 PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2, |
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261 F.getParent()); |
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262 ++PartialAlias; break; |
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263 case AliasAnalysis::MustAlias: |
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264 PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2, |
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265 F.getParent()); |
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266 ++MustAlias; break; |
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267 } |
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268 } |
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269 } |
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270 } |
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271 |
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272 // Mod/ref alias analysis: compare all pairs of calls and values |
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273 for (SetVector<CallSite>::iterator C = CallSites.begin(), |
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274 Ce = CallSites.end(); C != Ce; ++C) { |
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275 Instruction *I = C->getInstruction(); |
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276 |
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277 for (SetVector<Value *>::iterator V = Pointers.begin(), Ve = Pointers.end(); |
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278 V != Ve; ++V) { |
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279 uint64_t Size = AliasAnalysis::UnknownSize; |
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280 Type *ElTy = cast<PointerType>((*V)->getType())->getElementType(); |
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281 if (ElTy->isSized()) Size = AA.getTypeStoreSize(ElTy); |
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282 |
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283 switch (AA.getModRefInfo(*C, *V, Size)) { |
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284 case AliasAnalysis::NoModRef: |
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285 PrintModRefResults("NoModRef", PrintNoModRef, I, *V, F.getParent()); |
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286 ++NoModRef; break; |
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287 case AliasAnalysis::Mod: |
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288 PrintModRefResults("Just Mod", PrintMod, I, *V, F.getParent()); |
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289 ++Mod; break; |
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290 case AliasAnalysis::Ref: |
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291 PrintModRefResults("Just Ref", PrintRef, I, *V, F.getParent()); |
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292 ++Ref; break; |
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293 case AliasAnalysis::ModRef: |
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294 PrintModRefResults("Both ModRef", PrintModRef, I, *V, F.getParent()); |
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295 ++ModRef; break; |
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296 } |
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297 } |
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298 } |
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299 |
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300 // Mod/ref alias analysis: compare all pairs of calls |
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301 for (SetVector<CallSite>::iterator C = CallSites.begin(), |
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302 Ce = CallSites.end(); C != Ce; ++C) { |
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303 for (SetVector<CallSite>::iterator D = CallSites.begin(); D != Ce; ++D) { |
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304 if (D == C) |
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305 continue; |
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306 switch (AA.getModRefInfo(*C, *D)) { |
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307 case AliasAnalysis::NoModRef: |
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308 PrintModRefResults("NoModRef", PrintNoModRef, *C, *D, F.getParent()); |
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309 ++NoModRef; break; |
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310 case AliasAnalysis::Mod: |
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311 PrintModRefResults("Just Mod", PrintMod, *C, *D, F.getParent()); |
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312 ++Mod; break; |
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313 case AliasAnalysis::Ref: |
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314 PrintModRefResults("Just Ref", PrintRef, *C, *D, F.getParent()); |
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315 ++Ref; break; |
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316 case AliasAnalysis::ModRef: |
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317 PrintModRefResults("Both ModRef", PrintModRef, *C, *D, F.getParent()); |
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318 ++ModRef; break; |
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319 } |
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320 } |
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321 } |
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322 |
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323 return false; |
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324 } |
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325 |
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326 static void PrintPercent(unsigned Num, unsigned Sum) { |
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327 errs() << "(" << Num*100ULL/Sum << "." |
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328 << ((Num*1000ULL/Sum) % 10) << "%)\n"; |
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329 } |
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330 |
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331 bool AAEval::doFinalization(Module &M) { |
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332 unsigned AliasSum = NoAlias + MayAlias + PartialAlias + MustAlias; |
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333 errs() << "===== Alias Analysis Evaluator Report =====\n"; |
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334 if (AliasSum == 0) { |
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335 errs() << " Alias Analysis Evaluator Summary: No pointers!\n"; |
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336 } else { |
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337 errs() << " " << AliasSum << " Total Alias Queries Performed\n"; |
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338 errs() << " " << NoAlias << " no alias responses "; |
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339 PrintPercent(NoAlias, AliasSum); |
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340 errs() << " " << MayAlias << " may alias responses "; |
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341 PrintPercent(MayAlias, AliasSum); |
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342 errs() << " " << PartialAlias << " partial alias responses "; |
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343 PrintPercent(PartialAlias, AliasSum); |
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344 errs() << " " << MustAlias << " must alias responses "; |
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345 PrintPercent(MustAlias, AliasSum); |
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346 errs() << " Alias Analysis Evaluator Pointer Alias Summary: " |
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347 << NoAlias*100/AliasSum << "%/" << MayAlias*100/AliasSum << "%/" |
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348 << PartialAlias*100/AliasSum << "%/" |
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349 << MustAlias*100/AliasSum << "%\n"; |
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350 } |
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351 |
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352 // Display the summary for mod/ref analysis |
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353 unsigned ModRefSum = NoModRef + Mod + Ref + ModRef; |
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354 if (ModRefSum == 0) { |
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355 errs() << " Alias Analysis Mod/Ref Evaluator Summary: no mod/ref!\n"; |
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356 } else { |
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357 errs() << " " << ModRefSum << " Total ModRef Queries Performed\n"; |
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358 errs() << " " << NoModRef << " no mod/ref responses "; |
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359 PrintPercent(NoModRef, ModRefSum); |
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360 errs() << " " << Mod << " mod responses "; |
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361 PrintPercent(Mod, ModRefSum); |
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362 errs() << " " << Ref << " ref responses "; |
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363 PrintPercent(Ref, ModRefSum); |
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364 errs() << " " << ModRef << " mod & ref responses "; |
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365 PrintPercent(ModRef, ModRefSum); |
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366 errs() << " Alias Analysis Evaluator Mod/Ref Summary: " |
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367 << NoModRef*100/ModRefSum << "%/" << Mod*100/ModRefSum << "%/" |
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368 << Ref*100/ModRefSum << "%/" << ModRef*100/ModRefSum << "%\n"; |
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369 } |
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370 |
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371 return false; |
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372 } |