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annotate gen/optimizer.cpp @ 1268:4ae3b3ceea11

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Remove a bit of code duplication.
author Frits van Bommel <fvbommel wxs.nl>
date Sun, 26 Apr 2009 20:36:53 +0200
parents 381c3ee0ca00
children bedf0bfb8fdb
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1 #include "gen/optimizer.h"
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2 #include "gen/cl_helpers.h"
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3
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4 #include "llvm/PassManager.h"
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5 #include "llvm/LinkAllPasses.h"
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6 #include "llvm/Analysis/LoopPass.h"
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7 #include "llvm/Target/TargetData.h"
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8 #include "llvm/Support/CommandLine.h"
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9 #include "llvm/Support/PassNameParser.h"
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10
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11 #include "root.h" // error()
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13 using namespace llvm;
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14
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15 // Allow the user to specify specific optimizations to run.
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16 static cl::list<const PassInfo*, bool, PassNameParser>
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17 passList(
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18 cl::desc("Running specific optimizations:"),
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19 cl::Hidden // to clean up --help output
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20 );
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21
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22 static cl::opt<char> optimizeLevel(
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23 cl::desc("Setting the optimization level:"),
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24 cl::ZeroOrMore,
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25 cl::values(
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26 clEnumValN(2, "O", "Equivalent to -O2"),
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27 clEnumValN(0, "O0", "No optimizations (default)"),
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28 clEnumValN(1, "O1", "Simple optimizations"),
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29 clEnumValN(2, "O2", "Good optimizations"),
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30 clEnumValN(3, "O3", "Aggressive optimizations"),
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31 clEnumValN(4, "O4", "Link-time optimization"), // not implemented?
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32 clEnumValN(5, "O5", "Link-time optimization"), // not implemented?
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33 clEnumValEnd),
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34 cl::init(0));
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35
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36 static cl::opt<opts::BoolOrDefaultAdapter, false, opts::FlagParser>
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37 enableInlining("inlining",
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38 cl::desc("(*) Enable function inlining (in -O<N>, if given)"),
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39 cl::ZeroOrMore);
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40
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41 // Determine whether or not to run the inliner as part of the default list of
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42 // optimization passes.
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43 // If not explicitly specified, treat as false for -O0-2, and true for -O3.
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44 bool doInline() {
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45 return enableInlining == cl::BOU_TRUE
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46 || (enableInlining == cl::BOU_UNSET && optimizeLevel >= 3);
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47 }
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48
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49 // Some extra accessors for the linker: (llvm-ld version only, currently unused?)
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50 int optLevel() {
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51 return optimizeLevel;
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52 }
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53
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54 bool optimize() {
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55 return optimizeLevel || doInline() || !passList.empty();
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56 }
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57
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58 // this function inserts some or all of the std-compile-opts passes depending on the
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59 // optimization level given.
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60 static void addPassesForOptLevel(PassManager& pm) {
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61 // -O1
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62 if (optimizeLevel >= 1)
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63 {
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64 //pm.add(createStripDeadPrototypesPass());
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65 pm.add(createGlobalDCEPass());
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66 pm.add(createRaiseAllocationsPass());
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67 pm.add(createCFGSimplificationPass());
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68 if (optimizeLevel == 1)
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69 pm.add(createPromoteMemoryToRegisterPass());
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70 else
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71 pm.add(createScalarReplAggregatesPass());
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72 pm.add(createGlobalOptimizerPass());
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73 pm.add(createGlobalDCEPass());
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74 }
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75
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76 // -O2
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77 if (optimizeLevel >= 2)
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78 {
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79 pm.add(createIPConstantPropagationPass());
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80 pm.add(createDeadArgEliminationPass());
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81 pm.add(createInstructionCombiningPass());
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82 pm.add(createCFGSimplificationPass());
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83 pm.add(createPruneEHPass());
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84 }
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85
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86 // -inline
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87 if (doInline()) {
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88 pm.add(createFunctionInliningPass());
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89
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90 if (optimizeLevel >= 2) {
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91 // Run some optimizations to clean up after inlining.
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92 pm.add(createInstructionCombiningPass());
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93 pm.add(createScalarReplAggregatesPass());
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94
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95 // Inline again, to catch things like foreach delegates
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96 // passed to inlined opApply's where the function wasn't
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97 // known during the first inliner pass.
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98 pm.add(createFunctionInliningPass());
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99
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100 // Run clean-up again.
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101 pm.add(createInstructionCombiningPass());
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102 pm.add(createScalarReplAggregatesPass());
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103 }
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104 }
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105
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106 // -O3
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107 if (optimizeLevel >= 3)
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108 {
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109 pm.add(createArgumentPromotionPass());
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110 pm.add(createTailDuplicationPass());
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111 pm.add(createInstructionCombiningPass());
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112 pm.add(createCFGSimplificationPass());
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113 pm.add(createScalarReplAggregatesPass());
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114 pm.add(createInstructionCombiningPass());
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115 pm.add(createCondPropagationPass());
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116
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117 pm.add(createTailCallEliminationPass());
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118 pm.add(createCFGSimplificationPass());
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119 pm.add(createReassociatePass());
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120 pm.add(createLoopRotatePass());
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121 pm.add(createLICMPass());
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122 pm.add(createLoopUnswitchPass());
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123 pm.add(createInstructionCombiningPass());
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124 pm.add(createIndVarSimplifyPass());
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125 pm.add(createLoopUnrollPass());
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126 pm.add(createInstructionCombiningPass());
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127 pm.add(createGVNPass());
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128 pm.add(createSCCPPass());
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129
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130 pm.add(createInstructionCombiningPass());
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131 pm.add(createCondPropagationPass());
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132
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133 pm.add(createDeadStoreEliminationPass());
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134 pm.add(createAggressiveDCEPass());
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135 pm.add(createCFGSimplificationPass());
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136 pm.add(createSimplifyLibCallsPass());
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137 pm.add(createDeadTypeEliminationPass());
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138 pm.add(createConstantMergePass());
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139 }
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140
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141 // level -O4 and -O5 are linktime optimizations
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142 }
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143
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144 //////////////////////////////////////////////////////////////////////////////////////////
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145 // This function runs optimization passes based on command line arguments.
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146 // Returns true if any optimization passes were invoked.
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147 bool ldc_optimize_module(llvm::Module* m)
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148 {
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149 if (!optimize())
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150 return false;
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151
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152 PassManager pm;
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153 pm.add(new TargetData(m));
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154
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155 bool optimize = optimizeLevel != 0 || doInline();
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156
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157 unsigned optPos = optimizeLevel != 0
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158 ? optimizeLevel.getPosition()
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159 : enableInlining.getPosition();
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160
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161 for (size_t i = 0; i < passList.size(); i++) {
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162 // insert -O<N> / -enable-inlining in right position
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163 if (optimize && optPos < passList.getPosition(i)) {
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164 addPassesForOptLevel(pm);
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165 optimize = false;
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166 }
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167
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168 const PassInfo* pass = passList[i];
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169 if (PassInfo::NormalCtor_t ctor = pass->getNormalCtor()) {
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170 pm.add(ctor());
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171 } else {
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172 const char* arg = pass->getPassArgument(); // may return null
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173 if (arg)
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174 error("Can't create pass '-%s' (%s)", arg, pass->getPassName());
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175 else
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176 error("Can't create pass (%s)", pass->getPassName());
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177 assert(0); // Should be unreachable; root.h:error() calls exit()
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178 }
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179 }
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180 // insert -O<N> / -enable-inlining if specified at the end,
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181 if (optimize)
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182 addPassesForOptLevel(pm);
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183
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184 pm.run(*m);
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185 return true;
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186 }