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annotate lib/CodeGen/MachineSSAUpdater.cpp @ 134:3a76565eade5 LLVM5.0.1

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update 5.0.1
author mir3636
date Sat, 17 Feb 2018 09:57:20 +0900
parents 803732b1fca8
children c2174574ed3a
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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/MachineBasicBlock.h"
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19 #include "llvm/CodeGen/MachineFunction.h"
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20 #include "llvm/CodeGen/MachineInstr.h"
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21 #include "llvm/CodeGen/MachineInstrBuilder.h"
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22 #include "llvm/CodeGen/MachineOperand.h"
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23 #include "llvm/CodeGen/MachineRegisterInfo.h"
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24 #include "llvm/CodeGen/TargetInstrInfo.h"
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25 #include "llvm/CodeGen/TargetOpcodes.h"
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26 #include "llvm/CodeGen/TargetSubtargetInfo.h"
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27 #include "llvm/IR/DebugLoc.h"
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28 #include "llvm/Support/Debug.h"
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29 #include "llvm/Support/ErrorHandling.h"
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30 #include "llvm/Support/raw_ostream.h"
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31 #include "llvm/Transforms/Utils/SSAUpdaterImpl.h"
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32 #include <utility>
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33
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34 using namespace llvm;
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35
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36 #define DEBUG_TYPE "machine-ssaupdater"
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37
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38 using AvailableValsTy = DenseMap<MachineBasicBlock *, unsigned>;
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39
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40 static AvailableValsTy &getAvailableVals(void *AV) {
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41 return *static_cast<AvailableValsTy*>(AV);
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42 }
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43
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44 MachineSSAUpdater::MachineSSAUpdater(MachineFunction &MF,
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45 SmallVectorImpl<MachineInstr*> *NewPHI)
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46 : InsertedPHIs(NewPHI), TII(MF.getSubtarget().getInstrInfo()),
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47 MRI(&MF.getRegInfo()) {}
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48
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49 MachineSSAUpdater::~MachineSSAUpdater() {
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50 delete static_cast<AvailableValsTy*>(AV);
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51 }
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52
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53 /// Initialize - Reset this object to get ready for a new set of SSA
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54 /// updates. ProtoValue is the value used to name PHI nodes.
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55 void MachineSSAUpdater::Initialize(unsigned V) {
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56 if (!AV)
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57 AV = new AvailableValsTy();
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58 else
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59 getAvailableVals(AV).clear();
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60
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61 VR = V;
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62 VRC = MRI->getRegClass(VR);
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63 }
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64
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65 /// HasValueForBlock - Return true if the MachineSSAUpdater already has a value for
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66 /// the specified block.
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67 bool MachineSSAUpdater::HasValueForBlock(MachineBasicBlock *BB) const {
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68 return getAvailableVals(AV).count(BB);
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69 }
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70
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71 /// AddAvailableValue - Indicate that a rewritten value is available in the
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72 /// specified block with the specified value.
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73 void MachineSSAUpdater::AddAvailableValue(MachineBasicBlock *BB, unsigned V) {
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74 getAvailableVals(AV)[BB] = V;
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75 }
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76
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77 /// GetValueAtEndOfBlock - Construct SSA form, materializing a value that is
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78 /// live at the end of the specified block.
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79 unsigned MachineSSAUpdater::GetValueAtEndOfBlock(MachineBasicBlock *BB) {
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80 return GetValueAtEndOfBlockInternal(BB);
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81 }
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82
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83 static
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84 unsigned LookForIdenticalPHI(MachineBasicBlock *BB,
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85 SmallVectorImpl<std::pair<MachineBasicBlock *, unsigned>> &PredValues) {
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86 if (BB->empty())
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87 return 0;
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88
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89 MachineBasicBlock::iterator I = BB->begin();
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90 if (!I->isPHI())
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91 return 0;
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92
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93 AvailableValsTy AVals;
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94 for (unsigned i = 0, e = PredValues.size(); i != e; ++i)
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95 AVals[PredValues[i].first] = PredValues[i].second;
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96 while (I != BB->end() && I->isPHI()) {
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97 bool Same = true;
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98 for (unsigned i = 1, e = I->getNumOperands(); i != e; i += 2) {
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99 unsigned SrcReg = I->getOperand(i).getReg();
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100 MachineBasicBlock *SrcBB = I->getOperand(i+1).getMBB();
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101 if (AVals[SrcBB] != SrcReg) {
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102 Same = false;
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103 break;
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104 }
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105 }
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106 if (Same)
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107 return I->getOperand(0).getReg();
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108 ++I;
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109 }
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110 return 0;
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111 }
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112
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113 /// InsertNewDef - Insert an empty PHI or IMPLICIT_DEF instruction which define
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114 /// a value of the given register class at the start of the specified basic
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115 /// block. It returns the virtual register defined by the instruction.
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116 static
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117 MachineInstrBuilder InsertNewDef(unsigned Opcode,
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118 MachineBasicBlock *BB, MachineBasicBlock::iterator I,
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119 const TargetRegisterClass *RC,
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120 MachineRegisterInfo *MRI,
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121 const TargetInstrInfo *TII) {
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122 unsigned NewVR = MRI->createVirtualRegister(RC);
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123 return BuildMI(*BB, I, DebugLoc(), TII->get(Opcode), NewVR);
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124 }
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125
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126 /// GetValueInMiddleOfBlock - Construct SSA form, materializing a value that
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127 /// is live in the middle of the specified block.
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128 ///
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129 /// GetValueInMiddleOfBlock is the same as GetValueAtEndOfBlock except in one
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130 /// important case: if there is a definition of the rewritten value after the
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131 /// 'use' in BB. Consider code like this:
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132 ///
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133 /// X1 = ...
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 /// SomeBB:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 /// use(X)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 /// X2 = ...
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 /// br Cond, SomeBB, OutBB
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 /// 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
140 /// 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
141 /// 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
142 /// 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
143 /// 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
144 unsigned MachineSSAUpdater::GetValueInMiddleOfBlock(MachineBasicBlock *BB) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 // 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
146 // GetValueAtEndOfBlock to do our work.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 if (!HasValueForBlock(BB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 return GetValueAtEndOfBlockInternal(BB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 // If there are no predecessors, just return undef.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 if (BB->pred_empty()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 // Insert an implicit_def to represent an undef value.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 MachineInstr *NewDef = InsertNewDef(TargetOpcode::IMPLICIT_DEF,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 BB, BB->getFirstTerminator(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 VRC, MRI, TII);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 return NewDef->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 // 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
160 // predecessor.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 SmallVector<std::pair<MachineBasicBlock*, unsigned>, 8> PredValues;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 unsigned SingularValue = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 bool isFirstPred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 for (MachineBasicBlock::pred_iterator PI = BB->pred_begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 E = BB->pred_end(); PI != E; ++PI) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 MachineBasicBlock *PredBB = *PI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 unsigned PredVal = GetValueAtEndOfBlockInternal(PredBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 PredValues.push_back(std::make_pair(PredBB, PredVal));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 // Compute SingularValue.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 if (isFirstPred) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 SingularValue = PredVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 isFirstPred = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 } else if (PredVal != SingularValue)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 SingularValue = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 // 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
180 if (SingularValue != 0)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 return SingularValue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 // 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
184 unsigned DupPHI = LookForIdenticalPHI(BB, PredValues);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 if (DupPHI)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 return DupPHI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 // Otherwise, we do need a PHI: insert one now.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 MachineInstrBuilder InsertedPHI = InsertNewDef(TargetOpcode::PHI, BB,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 Loc, VRC, MRI, TII);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 // Fill in all the predecessors of the PHI.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 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
195 InsertedPHI.addReg(PredValues[i].second).addMBB(PredValues[i].first);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 // 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
198 // 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
199 if (unsigned ConstVal = InsertedPHI->isConstantValuePHI()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 InsertedPHI->eraseFromParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 return ConstVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 // 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
205 if (InsertedPHIs) InsertedPHIs->push_back(InsertedPHI);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 DEBUG(dbgs() << " Inserted PHI: " << *InsertedPHI << "\n");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 return InsertedPHI->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 static
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 MachineBasicBlock *findCorrespondingPred(const MachineInstr *MI,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 MachineOperand *U) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 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
215 if (&MI->getOperand(i) == U)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 return MI->getOperand(i+1).getMBB();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 }
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 llvm_unreachable("MachineOperand::getParent() failure?");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 /// 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
223 /// which use their value in the corresponding predecessor.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 void MachineSSAUpdater::RewriteUse(MachineOperand &U) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 MachineInstr *UseMI = U.getParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 unsigned NewVR = 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 if (UseMI->isPHI()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 MachineBasicBlock *SourceBB = findCorrespondingPred(UseMI, &U);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 NewVR = GetValueAtEndOfBlockInternal(SourceBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 } else {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 NewVR = GetValueInMiddleOfBlock(UseMI->getParent());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 }
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 U.setReg(NewVR);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 /// SSAUpdaterTraits<MachineSSAUpdater> - Traits for the SSAUpdaterImpl
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 /// template, specialized for MachineSSAUpdater.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 namespace llvm {
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
240
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 template<>
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 class SSAUpdaterTraits<MachineSSAUpdater> {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 public:
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
244 using BlkT = MachineBasicBlock;
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
245 using ValT = unsigned;
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
246 using PhiT = MachineInstr;
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
247 using BlkSucc_iterator = MachineBasicBlock::succ_iterator;
0
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 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
250 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
251
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 /// Iterator for PHI operands.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 class PHI_iterator {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 private:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 MachineInstr *PHI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 unsigned idx;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258 public:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 explicit PHI_iterator(MachineInstr *P) // begin iterator
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
260 : PHI(P), idx(1) {}
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 PHI_iterator(MachineInstr *P, bool) // end iterator
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
262 : PHI(P), idx(PHI->getNumOperands()) {}
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
263
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
264 PHI_iterator &operator++() { idx += 2; return *this; }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
265 bool operator==(const PHI_iterator& x) const { return idx == x.idx; }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
266 bool operator!=(const PHI_iterator& x) const { return !operator==(x); }
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
267
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
268 unsigned getIncomingValue() { return PHI->getOperand(idx).getReg(); }
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
269
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
270 MachineBasicBlock *getIncomingBlock() {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
271 return PHI->getOperand(idx+1).getMBB();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
272 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
273 };
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
274
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
275 static inline PHI_iterator PHI_begin(PhiT *PHI) { return PHI_iterator(PHI); }
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
276
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
277 static inline PHI_iterator PHI_end(PhiT *PHI) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
278 return PHI_iterator(PHI, true);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
279 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
280
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parents:
diff changeset
281 /// FindPredecessorBlocks - Put the predecessors of BB into the Preds
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
282 /// vector.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
283 static void FindPredecessorBlocks(MachineBasicBlock *BB,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
284 SmallVectorImpl<MachineBasicBlock*> *Preds){
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
285 for (MachineBasicBlock::pred_iterator PI = BB->pred_begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
286 E = BB->pred_end(); PI != E; ++PI)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
287 Preds->push_back(*PI);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
288 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
289
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
290 /// GetUndefVal - Create an IMPLICIT_DEF instruction with a new register.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
291 /// Add it into the specified block and return the register.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
292 static unsigned GetUndefVal(MachineBasicBlock *BB,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
293 MachineSSAUpdater *Updater) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
294 // Insert an implicit_def to represent an undef value.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
295 MachineInstr *NewDef = InsertNewDef(TargetOpcode::IMPLICIT_DEF,
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
296 BB, BB->getFirstTerminator(),
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
297 Updater->VRC, Updater->MRI,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
298 Updater->TII);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
299 return NewDef->getOperand(0).getReg();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
300 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
301
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
302 /// CreateEmptyPHI - Create a PHI instruction that defines a new register.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
303 /// Add it into the specified block and return the register.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
304 static unsigned CreateEmptyPHI(MachineBasicBlock *BB, unsigned NumPreds,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
305 MachineSSAUpdater *Updater) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
306 MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
307 MachineInstr *PHI = InsertNewDef(TargetOpcode::PHI, BB, Loc,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308 Updater->VRC, Updater->MRI,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309 Updater->TII);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310 return PHI->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
311 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
312
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
313 /// AddPHIOperand - Add the specified value as an operand of the PHI for
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
314 /// the specified predecessor block.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
315 static void AddPHIOperand(MachineInstr *PHI, unsigned Val,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
316 MachineBasicBlock *Pred) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
317 MachineInstrBuilder(*Pred->getParent(), PHI).addReg(Val).addMBB(Pred);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
318 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
319
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
320 /// InstrIsPHI - Check if an instruction is a PHI.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
321 static MachineInstr *InstrIsPHI(MachineInstr *I) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
322 if (I && I->isPHI())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
323 return I;
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
324 return nullptr;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
325 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
326
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
327 /// ValueIsPHI - Check if the instruction that defines the specified register
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
328 /// is a PHI instruction.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
329 static MachineInstr *ValueIsPHI(unsigned Val, MachineSSAUpdater *Updater) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
330 return InstrIsPHI(Updater->MRI->getVRegDef(Val));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
331 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
332
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
333 /// ValueIsNewPHI - Like ValueIsPHI but also check if the PHI has no source
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
334 /// operands, i.e., it was just added.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
335 static MachineInstr *ValueIsNewPHI(unsigned Val, MachineSSAUpdater *Updater) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
336 MachineInstr *PHI = ValueIsPHI(Val, Updater);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
337 if (PHI && PHI->getNumOperands() <= 1)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
338 return PHI;
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
339 return nullptr;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
340 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
341
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
342 /// GetPHIValue - For the specified PHI instruction, return the register
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
343 /// that it defines.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
344 static unsigned GetPHIValue(MachineInstr *PHI) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
345 return PHI->getOperand(0).getReg();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
346 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
347 };
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
348
121
803732b1fca8 LLVM 5.0
kono
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diff changeset
349 } // end namespace llvm
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
350
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
351 /// GetValueAtEndOfBlockInternal - Check to see if AvailableVals has an entry
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
352 /// for the specified BB and if so, return it. If not, construct SSA form by
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
353 /// first calculating the required placement of PHIs and then inserting new
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
354 /// PHIs where needed.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
355 unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
356 AvailableValsTy &AvailableVals = getAvailableVals(AV);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
357 if (unsigned V = AvailableVals[BB])
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
358 return V;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
359
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
360 SSAUpdaterImpl<MachineSSAUpdater> Impl(this, &AvailableVals, InsertedPHIs);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
361 return Impl.GetValue(BB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
362 }