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annotate lib/CodeGen/MachineSSAUpdater.cpp @ 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 1172e4bd9c6f
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1 //===- MachineSSAUpdater.cpp - Unstructured SSA Update Tool ---------------===//
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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 implements the MachineSSAUpdater class. It's based on SSAUpdater
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11 // class in lib/Transforms/Utils.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/CodeGen/MachineSSAUpdater.h"
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16 #include "llvm/ADT/DenseMap.h"
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17 #include "llvm/ADT/SmallVector.h"
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18 #include "llvm/CodeGen/MachineInstr.h"
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19 #include "llvm/CodeGen/MachineInstrBuilder.h"
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20 #include "llvm/CodeGen/MachineRegisterInfo.h"
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21 #include "llvm/Support/AlignOf.h"
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22 #include "llvm/Support/Allocator.h"
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23 #include "llvm/Support/Debug.h"
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24 #include "llvm/Support/ErrorHandling.h"
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25 #include "llvm/Support/raw_ostream.h"
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26 #include "llvm/Target/TargetInstrInfo.h"
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27 #include "llvm/Target/TargetRegisterInfo.h"
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28 #include "llvm/Target/TargetSubtargetInfo.h"
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29 #include "llvm/Transforms/Utils/SSAUpdaterImpl.h"
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30 using namespace llvm;
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31
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32 #define DEBUG_TYPE "machine-ssaupdater"
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33
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34 typedef DenseMap<MachineBasicBlock*, unsigned> AvailableValsTy;
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35 static AvailableValsTy &getAvailableVals(void *AV) {
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36 return *static_cast<AvailableValsTy*>(AV);
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37 }
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38
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39 MachineSSAUpdater::MachineSSAUpdater(MachineFunction &MF,
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40 SmallVectorImpl<MachineInstr*> *NewPHI)
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41 : AV(nullptr), InsertedPHIs(NewPHI) {
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42 TII = MF.getSubtarget().getInstrInfo();
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43 MRI = &MF.getRegInfo();
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44 }
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45
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46 MachineSSAUpdater::~MachineSSAUpdater() {
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47 delete static_cast<AvailableValsTy*>(AV);
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48 }
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49
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50 /// Initialize - Reset this object to get ready for a new set of SSA
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51 /// updates. ProtoValue is the value used to name PHI nodes.
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52 void MachineSSAUpdater::Initialize(unsigned V) {
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53 if (!AV)
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54 AV = new AvailableValsTy();
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55 else
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56 getAvailableVals(AV).clear();
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57
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58 VR = V;
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59 VRC = MRI->getRegClass(VR);
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60 }
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61
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62 /// HasValueForBlock - Return true if the MachineSSAUpdater already has a value for
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63 /// the specified block.
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64 bool MachineSSAUpdater::HasValueForBlock(MachineBasicBlock *BB) const {
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65 return getAvailableVals(AV).count(BB);
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66 }
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67
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68 /// AddAvailableValue - Indicate that a rewritten value is available in the
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69 /// specified block with the specified value.
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70 void MachineSSAUpdater::AddAvailableValue(MachineBasicBlock *BB, unsigned V) {
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71 getAvailableVals(AV)[BB] = V;
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72 }
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73
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74 /// GetValueAtEndOfBlock - Construct SSA form, materializing a value that is
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75 /// live at the end of the specified block.
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76 unsigned MachineSSAUpdater::GetValueAtEndOfBlock(MachineBasicBlock *BB) {
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77 return GetValueAtEndOfBlockInternal(BB);
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78 }
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79
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80 static
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81 unsigned LookForIdenticalPHI(MachineBasicBlock *BB,
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82 SmallVectorImpl<std::pair<MachineBasicBlock*, unsigned> > &PredValues) {
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83 if (BB->empty())
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84 return 0;
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85
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86 MachineBasicBlock::iterator I = BB->begin();
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87 if (!I->isPHI())
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88 return 0;
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89
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90 AvailableValsTy AVals;
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91 for (unsigned i = 0, e = PredValues.size(); i != e; ++i)
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92 AVals[PredValues[i].first] = PredValues[i].second;
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93 while (I != BB->end() && I->isPHI()) {
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94 bool Same = true;
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95 for (unsigned i = 1, e = I->getNumOperands(); i != e; i += 2) {
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96 unsigned SrcReg = I->getOperand(i).getReg();
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97 MachineBasicBlock *SrcBB = I->getOperand(i+1).getMBB();
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98 if (AVals[SrcBB] != SrcReg) {
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99 Same = false;
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100 break;
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101 }
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102 }
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103 if (Same)
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104 return I->getOperand(0).getReg();
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105 ++I;
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106 }
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107 return 0;
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108 }
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109
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110 /// InsertNewDef - Insert an empty PHI or IMPLICIT_DEF instruction which define
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111 /// a value of the given register class at the start of the specified basic
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112 /// block. It returns the virtual register defined by the instruction.
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113 static
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114 MachineInstrBuilder InsertNewDef(unsigned Opcode,
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115 MachineBasicBlock *BB, MachineBasicBlock::iterator I,
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116 const TargetRegisterClass *RC,
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117 MachineRegisterInfo *MRI,
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118 const TargetInstrInfo *TII) {
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119 unsigned NewVR = MRI->createVirtualRegister(RC);
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120 return BuildMI(*BB, I, DebugLoc(), TII->get(Opcode), NewVR);
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121 }
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122
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123 /// GetValueInMiddleOfBlock - Construct SSA form, materializing a value that
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124 /// is live in the middle of the specified block.
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125 ///
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126 /// GetValueInMiddleOfBlock is the same as GetValueAtEndOfBlock except in one
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127 /// important case: if there is a definition of the rewritten value after the
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128 /// 'use' in BB. Consider code like this:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 /// X1 = ...
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 /// SomeBB:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 /// use(X)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 /// X2 = ...
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 /// br Cond, SomeBB, OutBB
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:
diff changeset
136 /// In this case, there are two values (X1 and X2) added to the AvailableVals
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 /// set by the client of the rewriter, and those values are both live out of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 /// their respective blocks. However, the use of X happens in the *middle* of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 /// a block. Because of this, we need to insert a new PHI node in SomeBB to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 /// merge the appropriate values, and this value isn't live out of the block.
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 unsigned MachineSSAUpdater::GetValueInMiddleOfBlock(MachineBasicBlock *BB) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 // If there is no definition of the renamed variable in this block, just use
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 // GetValueAtEndOfBlock to do our work.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 if (!HasValueForBlock(BB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 return GetValueAtEndOfBlockInternal(BB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 // If there are no predecessors, just return undef.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 if (BB->pred_empty()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 // Insert an implicit_def to represent an undef value.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 MachineInstr *NewDef = InsertNewDef(TargetOpcode::IMPLICIT_DEF,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 BB, BB->getFirstTerminator(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 VRC, MRI, TII);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 return NewDef->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 // Otherwise, we have the hard case. Get the live-in values for each
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 // predecessor.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 SmallVector<std::pair<MachineBasicBlock*, unsigned>, 8> PredValues;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 unsigned SingularValue = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 bool isFirstPred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 for (MachineBasicBlock::pred_iterator PI = BB->pred_begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 E = BB->pred_end(); PI != E; ++PI) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 MachineBasicBlock *PredBB = *PI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 unsigned PredVal = GetValueAtEndOfBlockInternal(PredBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 PredValues.push_back(std::make_pair(PredBB, PredVal));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // Compute SingularValue.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 if (isFirstPred) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 SingularValue = PredVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 isFirstPred = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 } else if (PredVal != SingularValue)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 SingularValue = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 // Otherwise, if all the merged values are the same, just use it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 if (SingularValue != 0)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 return SingularValue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 // If an identical PHI is already in BB, just reuse it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 unsigned DupPHI = LookForIdenticalPHI(BB, PredValues);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 if (DupPHI)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 return DupPHI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 // Otherwise, we do need a PHI: insert one now.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 MachineInstrBuilder InsertedPHI = InsertNewDef(TargetOpcode::PHI, BB,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 Loc, VRC, MRI, TII);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 // Fill in all the predecessors of the PHI.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 for (unsigned i = 0, e = PredValues.size(); i != e; ++i)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 InsertedPHI.addReg(PredValues[i].second).addMBB(PredValues[i].first);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 // See if the PHI node can be merged to a single value. This can happen in
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 // loop cases when we get a PHI of itself and one other value.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 if (unsigned ConstVal = InsertedPHI->isConstantValuePHI()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 InsertedPHI->eraseFromParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
199 return ConstVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 // If the client wants to know about all new instructions, tell it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 if (InsertedPHIs) InsertedPHIs->push_back(InsertedPHI);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 DEBUG(dbgs() << " Inserted PHI: " << *InsertedPHI << "\n");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 return InsertedPHI->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 static
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 MachineBasicBlock *findCorrespondingPred(const MachineInstr *MI,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 MachineOperand *U) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 for (unsigned i = 1, e = MI->getNumOperands(); i != e; i += 2) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 if (&MI->getOperand(i) == U)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 return MI->getOperand(i+1).getMBB();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
216
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 llvm_unreachable("MachineOperand::getParent() failure?");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 /// RewriteUse - Rewrite a use of the symbolic value. This handles PHI nodes,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 /// which use their value in the corresponding predecessor.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 void MachineSSAUpdater::RewriteUse(MachineOperand &U) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 MachineInstr *UseMI = U.getParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 unsigned NewVR = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 if (UseMI->isPHI()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 MachineBasicBlock *SourceBB = findCorrespondingPred(UseMI, &U);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 NewVR = GetValueAtEndOfBlockInternal(SourceBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 } else {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 NewVR = GetValueInMiddleOfBlock(UseMI->getParent());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 U.setReg(NewVR);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 /// SSAUpdaterTraits<MachineSSAUpdater> - Traits for the SSAUpdaterImpl
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 /// template, specialized for MachineSSAUpdater.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 namespace llvm {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 template<>
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 class SSAUpdaterTraits<MachineSSAUpdater> {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 public:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 typedef MachineBasicBlock BlkT;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 typedef unsigned ValT;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 typedef MachineInstr PhiT;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 typedef MachineBasicBlock::succ_iterator BlkSucc_iterator;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 static BlkSucc_iterator BlkSucc_begin(BlkT *BB) { return BB->succ_begin(); }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 static BlkSucc_iterator BlkSucc_end(BlkT *BB) { return BB->succ_end(); }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 /// Iterator for PHI operands.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 class PHI_iterator {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 private:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 MachineInstr *PHI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 unsigned idx;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 public:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 explicit PHI_iterator(MachineInstr *P) // begin iterator
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 : PHI(P), idx(1) {}
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258 PHI_iterator(MachineInstr *P, bool) // end iterator
95c75e76d11b LLVM 3.4
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259 : PHI(P), idx(PHI->getNumOperands()) {}
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260
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261 PHI_iterator &operator++() { idx += 2; return *this; }
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262 bool operator==(const PHI_iterator& x) const { return idx == x.idx; }
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263 bool operator!=(const PHI_iterator& x) const { return !operator==(x); }
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264 unsigned getIncomingValue() { return PHI->getOperand(idx).getReg(); }
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265 MachineBasicBlock *getIncomingBlock() {
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266 return PHI->getOperand(idx+1).getMBB();
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267 }
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268 };
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269 static inline PHI_iterator PHI_begin(PhiT *PHI) { return PHI_iterator(PHI); }
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270 static inline PHI_iterator PHI_end(PhiT *PHI) {
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271 return PHI_iterator(PHI, true);
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272 }
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273
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274 /// FindPredecessorBlocks - Put the predecessors of BB into the Preds
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275 /// vector.
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276 static void FindPredecessorBlocks(MachineBasicBlock *BB,
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277 SmallVectorImpl<MachineBasicBlock*> *Preds){
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278 for (MachineBasicBlock::pred_iterator PI = BB->pred_begin(),
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279 E = BB->pred_end(); PI != E; ++PI)
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280 Preds->push_back(*PI);
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281 }
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282
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283 /// GetUndefVal - Create an IMPLICIT_DEF instruction with a new register.
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284 /// Add it into the specified block and return the register.
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285 static unsigned GetUndefVal(MachineBasicBlock *BB,
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286 MachineSSAUpdater *Updater) {
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287 // Insert an implicit_def to represent an undef value.
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288 MachineInstr *NewDef = InsertNewDef(TargetOpcode::IMPLICIT_DEF,
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289 BB, BB->getFirstTerminator(),
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290 Updater->VRC, Updater->MRI,
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291 Updater->TII);
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292 return NewDef->getOperand(0).getReg();
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293 }
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294
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295 /// CreateEmptyPHI - Create a PHI instruction that defines a new register.
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296 /// Add it into the specified block and return the register.
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297 static unsigned CreateEmptyPHI(MachineBasicBlock *BB, unsigned NumPreds,
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298 MachineSSAUpdater *Updater) {
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299 MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
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300 MachineInstr *PHI = InsertNewDef(TargetOpcode::PHI, BB, Loc,
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diff changeset
301 Updater->VRC, Updater->MRI,
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diff changeset
302 Updater->TII);
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diff changeset
303 return PHI->getOperand(0).getReg();
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304 }
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diff changeset
305
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306 /// AddPHIOperand - Add the specified value as an operand of the PHI for
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307 /// the specified predecessor block.
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308 static void AddPHIOperand(MachineInstr *PHI, unsigned Val,
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diff changeset
309 MachineBasicBlock *Pred) {
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diff changeset
310 MachineInstrBuilder(*Pred->getParent(), PHI).addReg(Val).addMBB(Pred);
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311 }
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312
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313 /// InstrIsPHI - Check if an instruction is a PHI.
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314 ///
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315 static MachineInstr *InstrIsPHI(MachineInstr *I) {
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316 if (I && I->isPHI())
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diff changeset
317 return I;
77
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diff changeset
318 return nullptr;
0
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diff changeset
319 }
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320
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321 /// ValueIsPHI - Check if the instruction that defines the specified register
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322 /// is a PHI instruction.
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diff changeset
323 static MachineInstr *ValueIsPHI(unsigned Val, MachineSSAUpdater *Updater) {
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diff changeset
324 return InstrIsPHI(Updater->MRI->getVRegDef(Val));
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diff changeset
325 }
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diff changeset
326
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327 /// ValueIsNewPHI - Like ValueIsPHI but also check if the PHI has no source
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diff changeset
328 /// operands, i.e., it was just added.
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diff changeset
329 static MachineInstr *ValueIsNewPHI(unsigned Val, MachineSSAUpdater *Updater) {
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diff changeset
330 MachineInstr *PHI = ValueIsPHI(Val, Updater);
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diff changeset
331 if (PHI && PHI->getNumOperands() <= 1)
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332 return PHI;
77
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diff changeset
333 return nullptr;
0
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diff changeset
334 }
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diff changeset
335
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336 /// GetPHIValue - For the specified PHI instruction, return the register
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diff changeset
337 /// that it defines.
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diff changeset
338 static unsigned GetPHIValue(MachineInstr *PHI) {
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diff changeset
339 return PHI->getOperand(0).getReg();
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diff changeset
340 }
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diff changeset
341 };
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diff changeset
342
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343 } // End llvm namespace
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diff changeset
344
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345 /// GetValueAtEndOfBlockInternal - Check to see if AvailableVals has an entry
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parents:
diff changeset
346 /// for the specified BB and if so, return it. If not, construct SSA form by
95c75e76d11b LLVM 3.4
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parents:
diff changeset
347 /// first calculating the required placement of PHIs and then inserting new
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parents:
diff changeset
348 /// PHIs where needed.
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diff changeset
349 unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){
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diff changeset
350 AvailableValsTy &AvailableVals = getAvailableVals(AV);
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parents:
diff changeset
351 if (unsigned V = AvailableVals[BB])
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
352 return V;
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parents:
diff changeset
353
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parents:
diff changeset
354 SSAUpdaterImpl<MachineSSAUpdater> Impl(this, &AvailableVals, InsertedPHIs);
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parents:
diff changeset
355 return Impl.GetValue(BB);
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parents:
diff changeset
356 }