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1 //===- MachineBlockFrequencyInfo.cpp - MBB Frequency Analysis -------------===//
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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 // Loops should be simplified before this analysis.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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15 #include "llvm/Analysis/BlockFrequencyInfoImpl.h"
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16 #include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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17 #include "llvm/CodeGen/MachineFunction.h"
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18 #include "llvm/CodeGen/MachineLoopInfo.h"
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19 #include "llvm/CodeGen/Passes.h"
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20 #include "llvm/InitializePasses.h"
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21 #include "llvm/Support/CommandLine.h"
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22 #include "llvm/Support/Debug.h"
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23 #include "llvm/Support/GraphWriter.h"
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24
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25 using namespace llvm;
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26
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27 #define DEBUG_TYPE "block-freq"
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28
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33
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29 #ifndef NDEBUG
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30 enum GVDAGType {
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31 GVDT_None,
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32 GVDT_Fraction,
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33 GVDT_Integer
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34 };
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35
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36 static cl::opt<GVDAGType>
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37 ViewMachineBlockFreqPropagationDAG("view-machine-block-freq-propagation-dags",
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38 cl::Hidden,
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39 cl::desc("Pop up a window to show a dag displaying how machine block "
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40 "frequencies propagate through the CFG."),
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41 cl::values(
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42 clEnumValN(GVDT_None, "none",
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43 "do not display graphs."),
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44 clEnumValN(GVDT_Fraction, "fraction", "display a graph using the "
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45 "fractional block frequency representation."),
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46 clEnumValN(GVDT_Integer, "integer", "display a graph using the raw "
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47 "integer fractional block frequency representation."),
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48 clEnumValEnd));
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49
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50 namespace llvm {
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51
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52 template <>
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53 struct GraphTraits<MachineBlockFrequencyInfo *> {
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54 typedef const MachineBasicBlock NodeType;
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55 typedef MachineBasicBlock::const_succ_iterator ChildIteratorType;
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56 typedef MachineFunction::const_iterator nodes_iterator;
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57
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58 static inline
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59 const NodeType *getEntryNode(const MachineBlockFrequencyInfo *G) {
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60 return &G->getFunction()->front();
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61 }
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62
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63 static ChildIteratorType child_begin(const NodeType *N) {
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64 return N->succ_begin();
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65 }
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66
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67 static ChildIteratorType child_end(const NodeType *N) {
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68 return N->succ_end();
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69 }
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70
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71 static nodes_iterator nodes_begin(const MachineBlockFrequencyInfo *G) {
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72 return G->getFunction()->begin();
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73 }
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74
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75 static nodes_iterator nodes_end(const MachineBlockFrequencyInfo *G) {
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76 return G->getFunction()->end();
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77 }
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78 };
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79
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80 template<>
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81 struct DOTGraphTraits<MachineBlockFrequencyInfo*> :
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82 public DefaultDOTGraphTraits {
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83 explicit DOTGraphTraits(bool isSimple=false) :
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84 DefaultDOTGraphTraits(isSimple) {}
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85
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86 static std::string getGraphName(const MachineBlockFrequencyInfo *G) {
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87 return G->getFunction()->getName();
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88 }
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89
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90 std::string getNodeLabel(const MachineBasicBlock *Node,
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91 const MachineBlockFrequencyInfo *Graph) {
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92 std::string Result;
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93 raw_string_ostream OS(Result);
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94
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95 OS << Node->getName().str() << ":";
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96 switch (ViewMachineBlockFreqPropagationDAG) {
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97 case GVDT_Fraction:
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98 Graph->printBlockFreq(OS, Node);
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99 break;
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100 case GVDT_Integer:
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101 OS << Graph->getBlockFreq(Node).getFrequency();
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102 break;
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103 case GVDT_None:
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104 llvm_unreachable("If we are not supposed to render a graph we should "
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105 "never reach this point.");
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106 }
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107
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108 return Result;
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109 }
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110 };
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111
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112
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113 } // end namespace llvm
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114 #endif
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115
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116 INITIALIZE_PASS_BEGIN(MachineBlockFrequencyInfo, "machine-block-freq",
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117 "Machine Block Frequency Analysis", true, true)
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118 INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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119 INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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120 INITIALIZE_PASS_END(MachineBlockFrequencyInfo, "machine-block-freq",
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121 "Machine Block Frequency Analysis", true, true)
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122
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123 char MachineBlockFrequencyInfo::ID = 0;
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124
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125
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126 MachineBlockFrequencyInfo::
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127 MachineBlockFrequencyInfo() :MachineFunctionPass(ID) {
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128 initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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129 }
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130
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131 MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() {}
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132
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133 void MachineBlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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134 AU.addRequired<MachineBranchProbabilityInfo>();
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135 AU.addRequired<MachineLoopInfo>();
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136 AU.setPreservesAll();
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137 MachineFunctionPass::getAnalysisUsage(AU);
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138 }
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139
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140 bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
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141 MachineBranchProbabilityInfo &MBPI =
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142 getAnalysis<MachineBranchProbabilityInfo>();
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143 MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
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144 if (!MBFI)
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145 MBFI.reset(new ImplType);
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146 MBFI->calculate(F, MBPI, MLI);
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147 #ifndef NDEBUG
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148 if (ViewMachineBlockFreqPropagationDAG != GVDT_None) {
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149 view();
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150 }
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151 #endif
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152 return false;
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153 }
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154
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155 void MachineBlockFrequencyInfo::releaseMemory() { MBFI.reset(); }
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156
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157 /// Pop up a ghostview window with the current block frequency propagation
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158 /// rendered using dot.
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159 void MachineBlockFrequencyInfo::view() const {
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160 // This code is only for debugging.
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161 #ifndef NDEBUG
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162 ViewGraph(const_cast<MachineBlockFrequencyInfo *>(this),
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163 "MachineBlockFrequencyDAGs");
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164 #else
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165 errs() << "MachineBlockFrequencyInfo::view is only available in debug builds "
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166 "on systems with Graphviz or gv!\n";
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167 #endif // NDEBUG
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168 }
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169
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170 BlockFrequency MachineBlockFrequencyInfo::
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171 getBlockFreq(const MachineBasicBlock *MBB) const {
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172 return MBFI ? MBFI->getBlockFreq(MBB) : 0;
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173 }
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174
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175 const MachineFunction *MachineBlockFrequencyInfo::getFunction() const {
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176 return MBFI ? MBFI->getFunction() : nullptr;
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177 }
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178
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179 raw_ostream &
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180 MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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181 const BlockFrequency Freq) const {
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182 return MBFI ? MBFI->printBlockFreq(OS, Freq) : OS;
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183 }
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184
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185 raw_ostream &
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186 MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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187 const MachineBasicBlock *MBB) const {
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188 return MBFI ? MBFI->printBlockFreq(OS, MBB) : OS;
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189 }
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190
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191 uint64_t MachineBlockFrequencyInfo::getEntryFreq() const {
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192 return MBFI ? MBFI->getEntryFreq() : 0;
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193 }
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