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annotate include/llvm/Analysis/BranchProbabilityInfo.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 //===--- BranchProbabilityInfo.h - Branch Probability Analysis --*- 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 pass is used to evaluate branch probabilties.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_ANALYSIS_BRANCHPROBABILITYINFO_H
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15 #define LLVM_ANALYSIS_BRANCHPROBABILITYINFO_H
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16
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17 #include "llvm/ADT/DenseMap.h"
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18 #include "llvm/ADT/SmallPtrSet.h"
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19 #include "llvm/IR/CFG.h"
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20 #include "llvm/InitializePasses.h"
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21 #include "llvm/Pass.h"
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22 #include "llvm/Support/BranchProbability.h"
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23
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24 namespace llvm {
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25 class LoopInfo;
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26 class raw_ostream;
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27
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28 /// \brief Analysis pass providing branch probability information.
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29 ///
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30 /// This is a function analysis pass which provides information on the relative
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31 /// probabilities of each "edge" in the function's CFG where such an edge is
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32 /// defined by a pair (PredBlock and an index in the successors). The
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33 /// probability of an edge from one block is always relative to the
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34 /// probabilities of other edges from the block. The probabilites of all edges
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35 /// from a block sum to exactly one (100%).
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36 /// We use a pair (PredBlock and an index in the successors) to uniquely
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37 /// identify an edge, since we can have multiple edges from Src to Dst.
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38 /// As an example, we can have a switch which jumps to Dst with value 0 and
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39 /// value 10.
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40 class BranchProbabilityInfo : public FunctionPass {
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41 public:
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42 static char ID;
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43
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44 BranchProbabilityInfo() : FunctionPass(ID) {
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45 initializeBranchProbabilityInfoPass(*PassRegistry::getPassRegistry());
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46 }
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47
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48 void getAnalysisUsage(AnalysisUsage &AU) const override;
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49 bool runOnFunction(Function &F) override;
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50 void print(raw_ostream &OS, const Module *M = nullptr) const override;
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51
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52 /// \brief Get an edge's probability, relative to other out-edges of the Src.
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53 ///
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54 /// This routine provides access to the fractional probability between zero
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55 /// (0%) and one (100%) of this edge executing, relative to other edges
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56 /// leaving the 'Src' block. The returned probability is never zero, and can
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57 /// only be one if the source block has only one successor.
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58 BranchProbability getEdgeProbability(const BasicBlock *Src,
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59 unsigned IndexInSuccessors) const;
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60
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61 /// \brief Get the probability of going from Src to Dst.
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62 ///
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63 /// It returns the sum of all probabilities for edges from Src to Dst.
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64 BranchProbability getEdgeProbability(const BasicBlock *Src,
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65 const BasicBlock *Dst) const;
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66
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67 /// \brief Test if an edge is hot relative to other out-edges of the Src.
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68 ///
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69 /// Check whether this edge out of the source block is 'hot'. We define hot
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70 /// as having a relative probability >= 80%.
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71 bool isEdgeHot(const BasicBlock *Src, const BasicBlock *Dst) const;
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72
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73 /// \brief Retrieve the hot successor of a block if one exists.
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74 ///
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75 /// Given a basic block, look through its successors and if one exists for
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76 /// which \see isEdgeHot would return true, return that successor block.
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77 BasicBlock *getHotSucc(BasicBlock *BB) const;
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78
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79 /// \brief Print an edge's probability.
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80 ///
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81 /// Retrieves an edge's probability similarly to \see getEdgeProbability, but
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82 /// then prints that probability to the provided stream. That stream is then
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83 /// returned.
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84 raw_ostream &printEdgeProbability(raw_ostream &OS, const BasicBlock *Src,
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85 const BasicBlock *Dst) const;
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86
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87 /// \brief Get the raw edge weight calculated for the edge.
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88 ///
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89 /// This returns the raw edge weight. It is guaranteed to fall between 1 and
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90 /// UINT32_MAX. Note that the raw edge weight is not meaningful in isolation.
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91 /// This interface should be very carefully, and primarily by routines that
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92 /// are updating the analysis by later calling setEdgeWeight.
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93 uint32_t getEdgeWeight(const BasicBlock *Src,
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94 unsigned IndexInSuccessors) const;
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95
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96 /// \brief Get the raw edge weight calculated for the block pair.
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97 ///
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98 /// This returns the sum of all raw edge weights from Src to Dst.
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99 /// It is guaranteed to fall between 1 and UINT32_MAX.
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100 uint32_t getEdgeWeight(const BasicBlock *Src, const BasicBlock *Dst) const;
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101
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102 uint32_t getEdgeWeight(const BasicBlock *Src,
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103 succ_const_iterator Dst) const;
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104
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105 /// \brief Set the raw edge weight for a given edge.
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106 ///
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107 /// This allows a pass to explicitly set the edge weight for an edge. It can
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108 /// be used when updating the CFG to update and preserve the branch
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109 /// probability information. Read the implementation of how these edge
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110 /// weights are calculated carefully before using!
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111 void setEdgeWeight(const BasicBlock *Src, unsigned IndexInSuccessors,
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112 uint32_t Weight);
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113
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114 static uint32_t getBranchWeightStackProtector(bool IsLikely) {
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115 return IsLikely ? (1u << 20) - 1 : 1;
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116 }
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117
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118 private:
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119 // Since we allow duplicate edges from one basic block to another, we use
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120 // a pair (PredBlock and an index in the successors) to specify an edge.
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121 typedef std::pair<const BasicBlock *, unsigned> Edge;
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122
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123 // Default weight value. Used when we don't have information about the edge.
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124 // TODO: DEFAULT_WEIGHT makes sense during static predication, when none of
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125 // the successors have a weight yet. But it doesn't make sense when providing
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126 // weight to an edge that may have siblings with non-zero weights. This can
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127 // be handled various ways, but it's probably fine for an edge with unknown
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128 // weight to just "inherit" the non-zero weight of an adjacent successor.
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129 static const uint32_t DEFAULT_WEIGHT = 16;
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130
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131 DenseMap<Edge, uint32_t> Weights;
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132
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133 /// \brief Handle to the LoopInfo analysis.
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134 LoopInfo *LI;
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135
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136 /// \brief Track the last function we run over for printing.
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137 Function *LastF;
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138
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139 /// \brief Track the set of blocks directly succeeded by a returning block.
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140 SmallPtrSet<BasicBlock *, 16> PostDominatedByUnreachable;
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141
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142 /// \brief Track the set of blocks that always lead to a cold call.
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143 SmallPtrSet<BasicBlock *, 16> PostDominatedByColdCall;
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144
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145 /// \brief Get sum of the block successors' weights.
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146 uint32_t getSumForBlock(const BasicBlock *BB) const;
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147
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148 bool calcUnreachableHeuristics(BasicBlock *BB);
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149 bool calcMetadataWeights(BasicBlock *BB);
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150 bool calcColdCallHeuristics(BasicBlock *BB);
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151 bool calcPointerHeuristics(BasicBlock *BB);
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152 bool calcLoopBranchHeuristics(BasicBlock *BB);
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153 bool calcZeroHeuristics(BasicBlock *BB);
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154 bool calcFloatingPointHeuristics(BasicBlock *BB);
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155 bool calcInvokeHeuristics(BasicBlock *BB);
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156 };
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157
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158 }
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159
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160 #endif