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annotate lib/Target/Mips/MipsOs16.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===---- MipsOs16.cpp for Mips Option -Os16 --------===//
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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 file defines an optimization phase for the MIPS target.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "MipsOs16.h"
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15 #include "llvm/IR/Module.h"
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16 #include "llvm/Support/CommandLine.h"
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17 #include "llvm/Support/Debug.h"
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18 #include "llvm/Support/raw_ostream.h"
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19
77
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20 #define DEBUG_TYPE "mips-os16"
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21
0
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22
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23 static cl::opt<std::string> Mips32FunctionMask(
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24 "mips32-function-mask",
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25 cl::init(""),
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26 cl::desc("Force function to be mips32"),
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27 cl::Hidden);
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28
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29 namespace {
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30
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31 // Figure out if we need float point based on the function signature.
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32 // We need to move variables in and/or out of floating point
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33 // registers because of the ABI
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34 //
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35 bool needsFPFromSig(Function &F) {
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36 Type* RetType = F.getReturnType();
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37 switch (RetType->getTypeID()) {
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38 case Type::FloatTyID:
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39 case Type::DoubleTyID:
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40 return true;
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41 default:
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42 ;
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43 }
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44 if (F.arg_size() >=1) {
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45 Argument &Arg = F.getArgumentList().front();
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46 switch (Arg.getType()->getTypeID()) {
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47 case Type::FloatTyID:
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48 case Type::DoubleTyID:
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49 return true;
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50 default:
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51 ;
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52 }
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53 }
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54 return false;
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55 }
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56
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57 // Figure out if the function will need floating point operations
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58 //
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59 bool needsFP(Function &F) {
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60 if (needsFPFromSig(F))
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61 return true;
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62 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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63 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
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64 I != E; ++I) {
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65 const Instruction &Inst = *I;
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66 switch (Inst.getOpcode()) {
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67 case Instruction::FAdd:
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68 case Instruction::FSub:
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69 case Instruction::FMul:
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70 case Instruction::FDiv:
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71 case Instruction::FRem:
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72 case Instruction::FPToUI:
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73 case Instruction::FPToSI:
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74 case Instruction::UIToFP:
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75 case Instruction::SIToFP:
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76 case Instruction::FPTrunc:
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77 case Instruction::FPExt:
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78 case Instruction::FCmp:
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79 return true;
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80 default:
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81 ;
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82 }
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83 if (const CallInst *CI = dyn_cast<CallInst>(I)) {
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84 DEBUG(dbgs() << "Working on call" << "\n");
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85 Function &F_ = *CI->getCalledFunction();
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86 if (needsFPFromSig(F_))
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87 return true;
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88 }
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89 }
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90 return false;
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91 }
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92 }
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93 namespace llvm {
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94
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95
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96 bool MipsOs16::runOnModule(Module &M) {
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97 bool usingMask = Mips32FunctionMask.length() > 0;
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98 bool doneUsingMask = false; // this will make it stop repeating
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99 DEBUG(dbgs() << "Run on Module MipsOs16 \n" << Mips32FunctionMask << "\n");
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100 if (usingMask)
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101 DEBUG(dbgs() << "using mask \n" << Mips32FunctionMask << "\n");
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102 unsigned int functionIndex = 0;
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103 bool modified = false;
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104 for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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105 if (F->isDeclaration()) continue;
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106 DEBUG(dbgs() << "Working on " << F->getName() << "\n");
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107 if (usingMask) {
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108 if (!doneUsingMask) {
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109 if (functionIndex == Mips32FunctionMask.length())
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110 functionIndex = 0;
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111 switch (Mips32FunctionMask[functionIndex]) {
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112 case '1':
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113 DEBUG(dbgs() << "mask forced mips32: " << F->getName() << "\n");
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114 F->addFnAttr("nomips16");
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115 break;
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116 case '.':
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117 doneUsingMask = true;
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118 break;
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119 default:
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120 break;
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121 }
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122 functionIndex++;
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123 }
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124 }
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125 else {
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126 if (needsFP(*F)) {
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127 DEBUG(dbgs() << "os16 forced mips32: " << F->getName() << "\n");
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128 F->addFnAttr("nomips16");
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129 }
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130 else {
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131 DEBUG(dbgs() << "os16 forced mips16: " << F->getName() << "\n");
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132 F->addFnAttr("mips16");
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133 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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136 return modified;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 char MipsOs16::ID = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 ModulePass *llvm::createMipsOs16(MipsTargetMachine &TM) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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144 return new MipsOs16;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147