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annotate gen/optimizer.cpp @ 1175:cc1efa23030a

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Enable inlining by default for -O3+.
author Frits van Bommel <fvbommel wxs.nl>
date Sun, 29 Mar 2009 19:38:59 +0200
parents b3887714b735
children a0844cc67840
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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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12
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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 pm.add(createPromoteMemoryToRegisterPass());
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69 pm.add(createGlobalOptimizerPass());
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70 pm.add(createGlobalDCEPass());
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71 }
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72
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73 // -O2
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74 if (optimizeLevel >= 2)
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75 {
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76 pm.add(createIPConstantPropagationPass());
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77 pm.add(createDeadArgEliminationPass());
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78 pm.add(createInstructionCombiningPass());
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79 pm.add(createCFGSimplificationPass());
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80 pm.add(createPruneEHPass());
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81 }
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82
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83 // -inline
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84 if (doInline()) {
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85 pm.add(createFunctionInliningPass());
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86 }
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87
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88 // -O3
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89 if (optimizeLevel >= 3)
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90 {
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91 pm.add(createArgumentPromotionPass());
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92 pm.add(createTailDuplicationPass());
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93 pm.add(createInstructionCombiningPass());
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94 pm.add(createCFGSimplificationPass());
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95 pm.add(createScalarReplAggregatesPass());
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96 pm.add(createInstructionCombiningPass());
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97 pm.add(createCondPropagationPass());
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98
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99 pm.add(createTailCallEliminationPass());
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100 pm.add(createCFGSimplificationPass());
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101 pm.add(createReassociatePass());
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102 pm.add(createLoopRotatePass());
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103 pm.add(createLICMPass());
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104 pm.add(createLoopUnswitchPass());
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105 pm.add(createInstructionCombiningPass());
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106 pm.add(createIndVarSimplifyPass());
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107 pm.add(createLoopUnrollPass());
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108 pm.add(createInstructionCombiningPass());
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109 pm.add(createGVNPass());
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110 pm.add(createSCCPPass());
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111
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112 pm.add(createInstructionCombiningPass());
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113 pm.add(createCondPropagationPass());
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114
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115 pm.add(createDeadStoreEliminationPass());
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116 pm.add(createAggressiveDCEPass());
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117 pm.add(createCFGSimplificationPass());
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118 pm.add(createSimplifyLibCallsPass());
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119 pm.add(createDeadTypeEliminationPass());
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120 pm.add(createConstantMergePass());
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121 }
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122
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123 // level -O4 and -O5 are linktime optimizations
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124 }
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125
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126 //////////////////////////////////////////////////////////////////////////////////////////
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127 // This function runs optimization passes based on command line arguments.
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128 // Returns true if any optimization passes were invoked.
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129 bool ldc_optimize_module(llvm::Module* m)
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130 {
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131 if (!doInline() && optimizeLevel == 0 && passList.empty())
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132 return false;
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133
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134 PassManager pm;
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135 pm.add(new TargetData(m));
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136
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137 bool optimize = optimizeLevel != 0 || doInline();
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138
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139 unsigned optPos = optimizeLevel != 0
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140 ? optimizeLevel.getPosition()
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141 : enableInlining.getPosition();
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142
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143 for (size_t i = 0; i < passList.size(); i++) {
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144 // insert -O<N> / -enable-inlining in right position
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145 if (optimize && optPos < passList.getPosition(i)) {
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146 addPassesForOptLevel(pm);
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147 optimize = false;
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148 }
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149
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150 const PassInfo* pass = passList[i];
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151 if (PassInfo::NormalCtor_t ctor = pass->getNormalCtor()) {
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152 pm.add(ctor());
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153 } else {
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154 const char* arg = pass->getPassArgument(); // may return null
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155 if (arg)
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156 error("Can't create pass '-%s' (%s)", arg, pass->getPassName());
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157 else
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158 error("Can't create pass (%s)", pass->getPassName());
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159 assert(0); // Should be unreachable; root.h:error() calls exit()
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160 }
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161 }
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162 // insert -O<N> / -enable-inlining if specified at the end,
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163 if (optimize)
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164 addPassesForOptLevel(pm);
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165
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166 pm.run(*m);
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167 return true;
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168 }