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annotate lib/Transforms/IPO/PartialInlining.cpp @ 80:67baa08a3894

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update to LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 25 Sep 2014 16:56:18 +0900
parents 54457678186b
children 60c9769439b8
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1 //===- PartialInlining.cpp - Inline parts of functions --------------------===//
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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 pass performs partial inlining, typically by inlining an if statement
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11 // that surrounds the body of the function.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Transforms/IPO.h"
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16 #include "llvm/ADT/Statistic.h"
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17 #include "llvm/IR/CFG.h"
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18 #include "llvm/IR/Dominators.h"
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19 #include "llvm/IR/Instructions.h"
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20 #include "llvm/IR/Module.h"
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21 #include "llvm/Pass.h"
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22 #include "llvm/Transforms/Utils/Cloning.h"
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23 #include "llvm/Transforms/Utils/CodeExtractor.h"
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24 using namespace llvm;
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25
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26 #define DEBUG_TYPE "partialinlining"
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27
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28 STATISTIC(NumPartialInlined, "Number of functions partially inlined");
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29
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30 namespace {
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31 struct PartialInliner : public ModulePass {
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32 void getAnalysisUsage(AnalysisUsage &AU) const override { }
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33 static char ID; // Pass identification, replacement for typeid
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34 PartialInliner() : ModulePass(ID) {
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35 initializePartialInlinerPass(*PassRegistry::getPassRegistry());
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36 }
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37
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38 bool runOnModule(Module& M) override;
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39
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40 private:
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41 Function* unswitchFunction(Function* F);
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42 };
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43 }
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44
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45 char PartialInliner::ID = 0;
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46 INITIALIZE_PASS(PartialInliner, "partial-inliner",
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47 "Partial Inliner", false, false)
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48
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49 ModulePass* llvm::createPartialInliningPass() { return new PartialInliner(); }
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50
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51 Function* PartialInliner::unswitchFunction(Function* F) {
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52 // First, verify that this function is an unswitching candidate...
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53 BasicBlock* entryBlock = F->begin();
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54 BranchInst *BR = dyn_cast<BranchInst>(entryBlock->getTerminator());
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55 if (!BR || BR->isUnconditional())
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56 return nullptr;
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57
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58 BasicBlock* returnBlock = nullptr;
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59 BasicBlock* nonReturnBlock = nullptr;
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60 unsigned returnCount = 0;
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61 for (succ_iterator SI = succ_begin(entryBlock), SE = succ_end(entryBlock);
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62 SI != SE; ++SI)
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63 if (isa<ReturnInst>((*SI)->getTerminator())) {
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64 returnBlock = *SI;
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65 returnCount++;
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66 } else
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67 nonReturnBlock = *SI;
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68
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69 if (returnCount != 1)
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70 return nullptr;
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71
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72 // Clone the function, so that we can hack away on it.
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73 ValueToValueMapTy VMap;
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74 Function* duplicateFunction = CloneFunction(F, VMap,
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75 /*ModuleLevelChanges=*/false);
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76 duplicateFunction->setLinkage(GlobalValue::InternalLinkage);
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77 F->getParent()->getFunctionList().push_back(duplicateFunction);
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78 BasicBlock* newEntryBlock = cast<BasicBlock>(VMap[entryBlock]);
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79 BasicBlock* newReturnBlock = cast<BasicBlock>(VMap[returnBlock]);
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80 BasicBlock* newNonReturnBlock = cast<BasicBlock>(VMap[nonReturnBlock]);
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81
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82 // Go ahead and update all uses to the duplicate, so that we can just
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83 // use the inliner functionality when we're done hacking.
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84 F->replaceAllUsesWith(duplicateFunction);
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85
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86 // Special hackery is needed with PHI nodes that have inputs from more than
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87 // one extracted block. For simplicity, just split the PHIs into a two-level
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88 // sequence of PHIs, some of which will go in the extracted region, and some
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89 // of which will go outside.
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90 BasicBlock* preReturn = newReturnBlock;
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91 newReturnBlock = newReturnBlock->splitBasicBlock(
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92 newReturnBlock->getFirstNonPHI());
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93 BasicBlock::iterator I = preReturn->begin();
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94 BasicBlock::iterator Ins = newReturnBlock->begin();
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95 while (I != preReturn->end()) {
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96 PHINode* OldPhi = dyn_cast<PHINode>(I);
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97 if (!OldPhi) break;
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98
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99 PHINode* retPhi = PHINode::Create(OldPhi->getType(), 2, "", Ins);
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100 OldPhi->replaceAllUsesWith(retPhi);
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101 Ins = newReturnBlock->getFirstNonPHI();
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102
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103 retPhi->addIncoming(I, preReturn);
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104 retPhi->addIncoming(OldPhi->getIncomingValueForBlock(newEntryBlock),
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105 newEntryBlock);
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106 OldPhi->removeIncomingValue(newEntryBlock);
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107
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108 ++I;
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109 }
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110 newEntryBlock->getTerminator()->replaceUsesOfWith(preReturn, newReturnBlock);
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111
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112 // Gather up the blocks that we're going to extract.
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113 std::vector<BasicBlock*> toExtract;
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114 toExtract.push_back(newNonReturnBlock);
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115 for (Function::iterator FI = duplicateFunction->begin(),
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116 FE = duplicateFunction->end(); FI != FE; ++FI)
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117 if (&*FI != newEntryBlock && &*FI != newReturnBlock &&
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118 &*FI != newNonReturnBlock)
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119 toExtract.push_back(FI);
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120
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121 // The CodeExtractor needs a dominator tree.
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122 DominatorTree DT;
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123 DT.recalculate(*duplicateFunction);
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124
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125 // Extract the body of the if.
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126 Function* extractedFunction
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127 = CodeExtractor(toExtract, &DT).extractCodeRegion();
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128
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129 InlineFunctionInfo IFI;
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130
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131 // Inline the top-level if test into all callers.
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132 std::vector<User *> Users(duplicateFunction->user_begin(),
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133 duplicateFunction->user_end());
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134 for (std::vector<User*>::iterator UI = Users.begin(), UE = Users.end();
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135 UI != UE; ++UI)
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136 if (CallInst *CI = dyn_cast<CallInst>(*UI))
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137 InlineFunction(CI, IFI);
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138 else if (InvokeInst *II = dyn_cast<InvokeInst>(*UI))
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139 InlineFunction(II, IFI);
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140
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141 // Ditch the duplicate, since we're done with it, and rewrite all remaining
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142 // users (function pointers, etc.) back to the original function.
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143 duplicateFunction->replaceAllUsesWith(F);
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144 duplicateFunction->eraseFromParent();
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145
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146 ++NumPartialInlined;
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147
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148 return extractedFunction;
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149 }
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150
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151 bool PartialInliner::runOnModule(Module& M) {
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152 std::vector<Function*> worklist;
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153 worklist.reserve(M.size());
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154 for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI)
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155 if (!FI->use_empty() && !FI->isDeclaration())
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156 worklist.push_back(&*FI);
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157
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158 bool changed = false;
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159 while (!worklist.empty()) {
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160 Function* currFunc = worklist.back();
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161 worklist.pop_back();
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162
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163 if (currFunc->use_empty()) continue;
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164
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165 bool recursive = false;
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166 for (User *U : currFunc->users())
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167 if (Instruction* I = dyn_cast<Instruction>(U))
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168 if (I->getParent()->getParent() == currFunc) {
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169 recursive = true;
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170 break;
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171 }
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172 if (recursive) continue;
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173
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174
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175 if (Function* newFunc = unswitchFunction(currFunc)) {
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176 worklist.push_back(newFunc);
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177 changed = true;
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178 }
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179
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180 }
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181
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182 return changed;
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183 }