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1 //===-- LiveIntervalAnalysis.cpp - Live Interval Analysis -----------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 // This file implements the LiveInterval analysis pass which is used
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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11 // by the Linear Scan Register allocator. This pass linearizes the
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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12 // basic blocks of the function in DFS order and uses the
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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13 // LiveVariables pass to conservatively compute live intervals for
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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14 // each virtual and physical register.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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16 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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17
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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18 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
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19 #include "LiveRangeCalc.h"
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20 #include "llvm/ADT/DenseSet.h"
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21 #include "llvm/ADT/STLExtras.h"
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22 #include "llvm/Analysis/AliasAnalysis.h"
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23 #include "llvm/CodeGen/LiveVariables.h"
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77
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24 #include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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25 #include "llvm/CodeGen/MachineDominators.h"
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26 #include "llvm/CodeGen/MachineInstr.h"
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27 #include "llvm/CodeGen/MachineRegisterInfo.h"
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28 #include "llvm/CodeGen/Passes.h"
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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29 #include "llvm/CodeGen/VirtRegMap.h"
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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30 #include "llvm/IR/Value.h"
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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31 #include "llvm/Support/BlockFrequency.h"
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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32 #include "llvm/Support/CommandLine.h"
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33 #include "llvm/Support/Debug.h"
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34 #include "llvm/Support/ErrorHandling.h"
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83
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35 #include "llvm/Support/Format.h"
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36 #include "llvm/Support/raw_ostream.h"
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37 #include "llvm/Target/TargetInstrInfo.h"
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38 #include "llvm/Target/TargetRegisterInfo.h"
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77
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39 #include "llvm/Target/TargetSubtargetInfo.h"
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40 #include <algorithm>
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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41 #include <cmath>
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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42 #include <limits>
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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43 using namespace llvm;
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44
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45 #define DEBUG_TYPE "regalloc"
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46
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47 char LiveIntervals::ID = 0;
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48 char &llvm::LiveIntervalsID = LiveIntervals::ID;
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49 INITIALIZE_PASS_BEGIN(LiveIntervals, "liveintervals",
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50 "Live Interval Analysis", false, false)
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51 INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
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52 INITIALIZE_PASS_DEPENDENCY(LiveVariables)
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53 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
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54 INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
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55 INITIALIZE_PASS_END(LiveIntervals, "liveintervals",
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56 "Live Interval Analysis", false, false)
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57
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58 #ifndef NDEBUG
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59 static cl::opt<bool> EnablePrecomputePhysRegs(
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60 "precompute-phys-liveness", cl::Hidden,
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61 cl::desc("Eagerly compute live intervals for all physreg units."));
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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62 #else
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63 static bool EnablePrecomputePhysRegs = false;
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64 #endif // NDEBUG
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65
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83
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66 static cl::opt<bool> EnableSubRegLiveness(
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67 "enable-subreg-liveness", cl::Hidden, cl::init(true),
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68 cl::desc("Enable subregister liveness tracking."));
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69
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70 namespace llvm {
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71 cl::opt<bool> UseSegmentSetForPhysRegs(
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72 "use-segment-set-for-physregs", cl::Hidden, cl::init(true),
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73 cl::desc(
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74 "Use segment set for the computation of the live ranges of physregs."));
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75 }
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76
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77 void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
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78 AU.setPreservesCFG();
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79 AU.addRequired<AliasAnalysis>();
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80 AU.addPreserved<AliasAnalysis>();
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81 // LiveVariables isn't really required by this analysis, it is only required
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82 // here to make sure it is live during TwoAddressInstructionPass and
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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83 // PHIElimination. This is temporary.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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84 AU.addRequired<LiveVariables>();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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85 AU.addPreserved<LiveVariables>();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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86 AU.addPreservedID(MachineLoopInfoID);
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87 AU.addRequiredTransitiveID(MachineDominatorsID);
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88 AU.addPreservedID(MachineDominatorsID);
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89 AU.addPreserved<SlotIndexes>();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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90 AU.addRequiredTransitive<SlotIndexes>();
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91 MachineFunctionPass::getAnalysisUsage(AU);
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92 }
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93
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94 LiveIntervals::LiveIntervals() : MachineFunctionPass(ID),
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77
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95 DomTree(nullptr), LRCalc(nullptr) {
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96 initializeLiveIntervalsPass(*PassRegistry::getPassRegistry());
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97 }
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98
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99 LiveIntervals::~LiveIntervals() {
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100 delete LRCalc;
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101 }
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102
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103 void LiveIntervals::releaseMemory() {
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104 // Free the live intervals themselves.
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105 for (unsigned i = 0, e = VirtRegIntervals.size(); i != e; ++i)
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106 delete VirtRegIntervals[TargetRegisterInfo::index2VirtReg(i)];
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107 VirtRegIntervals.clear();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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108 RegMaskSlots.clear();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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109 RegMaskBits.clear();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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110 RegMaskBlocks.clear();
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111
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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112 for (unsigned i = 0, e = RegUnitRanges.size(); i != e; ++i)
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113 delete RegUnitRanges[i];
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114 RegUnitRanges.clear();
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115
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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116 // Release VNInfo memory regions, VNInfo objects don't need to be dtor'd.
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117 VNInfoAllocator.Reset();
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118 }
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119
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120 /// runOnMachineFunction - calculates LiveIntervals
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121 ///
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122 bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
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123 MF = &fn;
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124 MRI = &MF->getRegInfo();
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83
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125 TRI = MF->getSubtarget().getRegisterInfo();
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126 TII = MF->getSubtarget().getInstrInfo();
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127 AA = &getAnalysis<AliasAnalysis>();
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128 Indexes = &getAnalysis<SlotIndexes>();
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129 DomTree = &getAnalysis<MachineDominatorTree>();
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83
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130
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131 if (EnableSubRegLiveness && MF->getSubtarget().enableSubRegLiveness())
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132 MRI->enableSubRegLiveness(true);
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133
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134 if (!LRCalc)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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135 LRCalc = new LiveRangeCalc();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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136
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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137 // Allocate space for all virtual registers.
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138 VirtRegIntervals.resize(MRI->getNumVirtRegs());
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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139
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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140 computeVirtRegs();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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141 computeRegMasks();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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142 computeLiveInRegUnits();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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143
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144 if (EnablePrecomputePhysRegs) {
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145 // For stress testing, precompute live ranges of all physical register
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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146 // units, including reserved registers.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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147 for (unsigned i = 0, e = TRI->getNumRegUnits(); i != e; ++i)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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148 getRegUnit(i);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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149 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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150 DEBUG(dump());
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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151 return true;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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152 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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153
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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154 /// print - Implement the dump method.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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155 void LiveIntervals::print(raw_ostream &OS, const Module* ) const {
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156 OS << "********** INTERVALS **********\n";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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157
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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158 // Dump the regunits.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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159 for (unsigned i = 0, e = RegUnitRanges.size(); i != e; ++i)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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160 if (LiveRange *LR = RegUnitRanges[i])
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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161 OS << PrintRegUnit(i, TRI) << ' ' << *LR << '\n';
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
162
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
163 // Dump the virtregs.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
164 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
165 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
166 if (hasInterval(Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
167 OS << getInterval(Reg) << '\n';
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
168 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
169
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
170 OS << "RegMasks:";
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
171 for (unsigned i = 0, e = RegMaskSlots.size(); i != e; ++i)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
172 OS << ' ' << RegMaskSlots[i];
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
173 OS << '\n';
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
174
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
175 printInstrs(OS);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
176 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
177
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
178 void LiveIntervals::printInstrs(raw_ostream &OS) const {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
179 OS << "********** MACHINEINSTRS **********\n";
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
180 MF->print(OS, Indexes);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
181 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
182
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
183 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
184 void LiveIntervals::dumpInstrs() const {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
185 printInstrs(dbgs());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
186 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
187 #endif
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
188
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
189 LiveInterval* LiveIntervals::createInterval(unsigned reg) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
190 float Weight = TargetRegisterInfo::isPhysicalRegister(reg) ?
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
191 llvm::huge_valf : 0.0F;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
192 return new LiveInterval(reg, Weight);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
193 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
194
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
195
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
196 /// computeVirtRegInterval - Compute the live interval of a virtual register,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
197 /// based on defs and uses.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
198 void LiveIntervals::computeVirtRegInterval(LiveInterval &LI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
199 assert(LRCalc && "LRCalc not initialized.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
200 assert(LI.empty() && "Should only compute empty intervals.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
201 LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
|
|
83
|
202 LRCalc->calculate(LI);
|
|
|
203 computeDeadValues(LI, nullptr);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
204 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
205
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
206 void LiveIntervals::computeVirtRegs() {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
207 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
208 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
209 if (MRI->reg_nodbg_empty(Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
210 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
211 createAndComputeVirtRegInterval(Reg);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
212 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
213 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
214
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
215 void LiveIntervals::computeRegMasks() {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
216 RegMaskBlocks.resize(MF->getNumBlockIDs());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
217
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
218 // Find all instructions with regmask operands.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
219 for (MachineFunction::iterator MBBI = MF->begin(), E = MF->end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
220 MBBI != E; ++MBBI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
221 MachineBasicBlock *MBB = MBBI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
222 std::pair<unsigned, unsigned> &RMB = RegMaskBlocks[MBB->getNumber()];
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
223 RMB.first = RegMaskSlots.size();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
224 for (MachineBasicBlock::iterator MI = MBB->begin(), ME = MBB->end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
225 MI != ME; ++MI)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
226 for (MIOperands MO(MI); MO.isValid(); ++MO) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
227 if (!MO->isRegMask())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
228 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
229 RegMaskSlots.push_back(Indexes->getInstructionIndex(MI).getRegSlot());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
230 RegMaskBits.push_back(MO->getRegMask());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
231 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
232 // Compute the number of register mask instructions in this block.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
233 RMB.second = RegMaskSlots.size() - RMB.first;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
234 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
235 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
236
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
237 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
238 // Register Unit Liveness
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
239 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
240 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
241 // Fixed interference typically comes from ABI boundaries: Function arguments
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
242 // and return values are passed in fixed registers, and so are exception
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
243 // pointers entering landing pads. Certain instructions require values to be
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
244 // present in specific registers. That is also represented through fixed
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
245 // interference.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
246 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
247
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
248 /// computeRegUnitInterval - Compute the live range of a register unit, based
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
249 /// on the uses and defs of aliasing registers. The range should be empty,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
250 /// or contain only dead phi-defs from ABI blocks.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
251 void LiveIntervals::computeRegUnitRange(LiveRange &LR, unsigned Unit) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
252 assert(LRCalc && "LRCalc not initialized.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
253 LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
254
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
255 // The physregs aliasing Unit are the roots and their super-registers.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
256 // Create all values as dead defs before extending to uses. Note that roots
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
257 // may share super-registers. That's OK because createDeadDefs() is
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
258 // idempotent. It is very rare for a register unit to have multiple roots, so
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
259 // uniquing super-registers is probably not worthwhile.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
260 for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
261 for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
262 Supers.isValid(); ++Supers) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
263 if (!MRI->reg_empty(*Supers))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
264 LRCalc->createDeadDefs(LR, *Supers);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
265 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
266 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
267
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
268 // Now extend LR to reach all uses.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
269 // Ignore uses of reserved registers. We only track defs of those.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
270 for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
271 for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
272 Supers.isValid(); ++Supers) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
273 unsigned Reg = *Supers;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
274 if (!MRI->isReserved(Reg) && !MRI->reg_empty(Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
275 LRCalc->extendToUses(LR, Reg);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
276 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
277 }
|
|
83
|
278
|
|
|
279 // Flush the segment set to the segment vector.
|
|
|
280 if (UseSegmentSetForPhysRegs)
|
|
|
281 LR.flushSegmentSet();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
282 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
283
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
284
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
285 /// computeLiveInRegUnits - Precompute the live ranges of any register units
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
286 /// that are live-in to an ABI block somewhere. Register values can appear
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
287 /// without a corresponding def when entering the entry block or a landing pad.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
288 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
289 void LiveIntervals::computeLiveInRegUnits() {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
290 RegUnitRanges.resize(TRI->getNumRegUnits());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
291 DEBUG(dbgs() << "Computing live-in reg-units in ABI blocks.\n");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
292
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
293 // Keep track of the live range sets allocated.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
294 SmallVector<unsigned, 8> NewRanges;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
295
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
296 // Check all basic blocks for live-ins.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
297 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
298 MFI != MFE; ++MFI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
299 const MachineBasicBlock *MBB = MFI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
300
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
301 // We only care about ABI blocks: Entry + landing pads.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
302 if ((MFI != MF->begin() && !MBB->isLandingPad()) || MBB->livein_empty())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
303 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
304
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
305 // Create phi-defs at Begin for all live-in registers.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
306 SlotIndex Begin = Indexes->getMBBStartIdx(MBB);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
307 DEBUG(dbgs() << Begin << "\tBB#" << MBB->getNumber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
308 for (MachineBasicBlock::livein_iterator LII = MBB->livein_begin(),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
309 LIE = MBB->livein_end(); LII != LIE; ++LII) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
310 for (MCRegUnitIterator Units(*LII, TRI); Units.isValid(); ++Units) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
311 unsigned Unit = *Units;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
312 LiveRange *LR = RegUnitRanges[Unit];
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
313 if (!LR) {
|
|
83
|
314 // Use segment set to speed-up initial computation of the live range.
|
|
|
315 LR = RegUnitRanges[Unit] = new LiveRange(UseSegmentSetForPhysRegs);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
316 NewRanges.push_back(Unit);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
317 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
318 VNInfo *VNI = LR->createDeadDef(Begin, getVNInfoAllocator());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
319 (void)VNI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
320 DEBUG(dbgs() << ' ' << PrintRegUnit(Unit, TRI) << '#' << VNI->id);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
321 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
322 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
323 DEBUG(dbgs() << '\n');
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
324 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
325 DEBUG(dbgs() << "Created " << NewRanges.size() << " new intervals.\n");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
326
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
327 // Compute the 'normal' part of the ranges.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
328 for (unsigned i = 0, e = NewRanges.size(); i != e; ++i) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
329 unsigned Unit = NewRanges[i];
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
330 computeRegUnitRange(*RegUnitRanges[Unit], Unit);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
331 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
332 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
333
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
334
|
|
83
|
335 static void createSegmentsForValues(LiveRange &LR,
|
|
|
336 iterator_range<LiveInterval::vni_iterator> VNIs) {
|
|
|
337 for (auto VNI : VNIs) {
|
|
|
338 if (VNI->isUnused())
|
|
|
339 continue;
|
|
|
340 SlotIndex Def = VNI->def;
|
|
|
341 LR.addSegment(LiveRange::Segment(Def, Def.getDeadSlot(), VNI));
|
|
|
342 }
|
|
|
343 }
|
|
|
344
|
|
|
345 typedef SmallVector<std::pair<SlotIndex, VNInfo*>, 16> ShrinkToUsesWorkList;
|
|
|
346
|
|
|
347 static void extendSegmentsToUses(LiveRange &LR, const SlotIndexes &Indexes,
|
|
|
348 ShrinkToUsesWorkList &WorkList,
|
|
|
349 const LiveRange &OldRange) {
|
|
|
350 // Keep track of the PHIs that are in use.
|
|
|
351 SmallPtrSet<VNInfo*, 8> UsedPHIs;
|
|
|
352 // Blocks that have already been added to WorkList as live-out.
|
|
|
353 SmallPtrSet<MachineBasicBlock*, 16> LiveOut;
|
|
|
354
|
|
|
355 // Extend intervals to reach all uses in WorkList.
|
|
|
356 while (!WorkList.empty()) {
|
|
|
357 SlotIndex Idx = WorkList.back().first;
|
|
|
358 VNInfo *VNI = WorkList.back().second;
|
|
|
359 WorkList.pop_back();
|
|
|
360 const MachineBasicBlock *MBB = Indexes.getMBBFromIndex(Idx.getPrevSlot());
|
|
|
361 SlotIndex BlockStart = Indexes.getMBBStartIdx(MBB);
|
|
|
362
|
|
|
363 // Extend the live range for VNI to be live at Idx.
|
|
|
364 if (VNInfo *ExtVNI = LR.extendInBlock(BlockStart, Idx)) {
|
|
|
365 assert(ExtVNI == VNI && "Unexpected existing value number");
|
|
|
366 (void)ExtVNI;
|
|
|
367 // Is this a PHIDef we haven't seen before?
|
|
|
368 if (!VNI->isPHIDef() || VNI->def != BlockStart ||
|
|
|
369 !UsedPHIs.insert(VNI).second)
|
|
|
370 continue;
|
|
|
371 // The PHI is live, make sure the predecessors are live-out.
|
|
|
372 for (auto &Pred : MBB->predecessors()) {
|
|
|
373 if (!LiveOut.insert(Pred).second)
|
|
|
374 continue;
|
|
|
375 SlotIndex Stop = Indexes.getMBBEndIdx(Pred);
|
|
|
376 // A predecessor is not required to have a live-out value for a PHI.
|
|
|
377 if (VNInfo *PVNI = OldRange.getVNInfoBefore(Stop))
|
|
|
378 WorkList.push_back(std::make_pair(Stop, PVNI));
|
|
|
379 }
|
|
|
380 continue;
|
|
|
381 }
|
|
|
382
|
|
|
383 // VNI is live-in to MBB.
|
|
|
384 DEBUG(dbgs() << " live-in at " << BlockStart << '\n');
|
|
|
385 LR.addSegment(LiveRange::Segment(BlockStart, Idx, VNI));
|
|
|
386
|
|
|
387 // Make sure VNI is live-out from the predecessors.
|
|
|
388 for (auto &Pred : MBB->predecessors()) {
|
|
|
389 if (!LiveOut.insert(Pred).second)
|
|
|
390 continue;
|
|
|
391 SlotIndex Stop = Indexes.getMBBEndIdx(Pred);
|
|
|
392 assert(OldRange.getVNInfoBefore(Stop) == VNI &&
|
|
|
393 "Wrong value out of predecessor");
|
|
|
394 WorkList.push_back(std::make_pair(Stop, VNI));
|
|
|
395 }
|
|
|
396 }
|
|
|
397 }
|
|
|
398
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
399 /// shrinkToUses - After removing some uses of a register, shrink its live
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
400 /// range to just the remaining uses. This method does not compute reaching
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
401 /// defs for new uses, and it doesn't remove dead defs.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
402 bool LiveIntervals::shrinkToUses(LiveInterval *li,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
403 SmallVectorImpl<MachineInstr*> *dead) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
404 DEBUG(dbgs() << "Shrink: " << *li << '\n');
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
405 assert(TargetRegisterInfo::isVirtualRegister(li->reg)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
406 && "Can only shrink virtual registers");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
407
|
|
83
|
408 // Shrink subregister live ranges.
|
|
|
409 for (LiveInterval::SubRange &S : li->subranges()) {
|
|
|
410 shrinkToUses(S, li->reg);
|
|
|
411 }
|
|
|
412
|
|
|
413 // Find all the values used, including PHI kills.
|
|
|
414 ShrinkToUsesWorkList WorkList;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
415
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
416 // Visit all instructions reading li->reg.
|
|
77
|
417 for (MachineRegisterInfo::reg_instr_iterator
|
|
|
418 I = MRI->reg_instr_begin(li->reg), E = MRI->reg_instr_end();
|
|
|
419 I != E; ) {
|
|
|
420 MachineInstr *UseMI = &*(I++);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
421 if (UseMI->isDebugValue() || !UseMI->readsVirtualRegister(li->reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
422 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
423 SlotIndex Idx = getInstructionIndex(UseMI).getRegSlot();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
424 LiveQueryResult LRQ = li->Query(Idx);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
425 VNInfo *VNI = LRQ.valueIn();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
426 if (!VNI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
427 // This shouldn't happen: readsVirtualRegister returns true, but there is
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
428 // no live value. It is likely caused by a target getting <undef> flags
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
429 // wrong.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
430 DEBUG(dbgs() << Idx << '\t' << *UseMI
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
431 << "Warning: Instr claims to read non-existent value in "
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
432 << *li << '\n');
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
433 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
434 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
435 // Special case: An early-clobber tied operand reads and writes the
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
436 // register one slot early.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
437 if (VNInfo *DefVNI = LRQ.valueDefined())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
438 Idx = DefVNI->def;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
439
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
440 WorkList.push_back(std::make_pair(Idx, VNI));
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
441 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
442
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
443 // Create new live ranges with only minimal live segments per def.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
444 LiveRange NewLR;
|
|
83
|
445 createSegmentsForValues(NewLR, make_range(li->vni_begin(), li->vni_end()));
|
|
|
446 extendSegmentsToUses(NewLR, *Indexes, WorkList, *li);
|
|
77
|
447
|
|
|
448 // Move the trimmed segments back.
|
|
|
449 li->segments.swap(NewLR.segments);
|
|
83
|
450
|
|
|
451 // Handle dead values.
|
|
|
452 bool CanSeparate = computeDeadValues(*li, dead);
|
|
77
|
453 DEBUG(dbgs() << "Shrunk: " << *li << '\n');
|
|
|
454 return CanSeparate;
|
|
|
455 }
|
|
|
456
|
|
83
|
457 bool LiveIntervals::computeDeadValues(LiveInterval &LI,
|
|
77
|
458 SmallVectorImpl<MachineInstr*> *dead) {
|
|
83
|
459 bool PHIRemoved = false;
|
|
|
460 for (auto VNI : LI.valnos) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
461 if (VNI->isUnused())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
462 continue;
|
|
83
|
463 SlotIndex Def = VNI->def;
|
|
|
464 LiveRange::iterator I = LI.FindSegmentContaining(Def);
|
|
|
465 assert(I != LI.end() && "Missing segment for VNI");
|
|
|
466
|
|
|
467 // Is the register live before? Otherwise we may have to add a read-undef
|
|
|
468 // flag for subregister defs.
|
|
|
469 if (MRI->tracksSubRegLiveness()) {
|
|
|
470 if ((I == LI.begin() || std::prev(I)->end < Def) && !VNI->isPHIDef()) {
|
|
|
471 MachineInstr *MI = getInstructionFromIndex(Def);
|
|
|
472 MI->addRegisterDefReadUndef(LI.reg);
|
|
|
473 }
|
|
|
474 }
|
|
|
475
|
|
|
476 if (I->end != Def.getDeadSlot())
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
477 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
478 if (VNI->isPHIDef()) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
479 // This is a dead PHI. Remove it.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
480 VNI->markUnused();
|
|
83
|
481 LI.removeSegment(I);
|
|
|
482 DEBUG(dbgs() << "Dead PHI at " << Def << " may separate interval\n");
|
|
|
483 PHIRemoved = true;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
484 } else {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
485 // This is a dead def. Make sure the instruction knows.
|
|
83
|
486 MachineInstr *MI = getInstructionFromIndex(Def);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
487 assert(MI && "No instruction defining live value");
|
|
83
|
488 MI->addRegisterDead(LI.reg, TRI);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
489 if (dead && MI->allDefsAreDead()) {
|
|
83
|
490 DEBUG(dbgs() << "All defs dead: " << Def << '\t' << *MI);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
491 dead->push_back(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
492 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
493 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
494 }
|
|
83
|
495 return PHIRemoved;
|
|
|
496 }
|
|
|
497
|
|
|
498 void LiveIntervals::shrinkToUses(LiveInterval::SubRange &SR, unsigned Reg)
|
|
|
499 {
|
|
|
500 DEBUG(dbgs() << "Shrink: " << SR << '\n');
|
|
|
501 assert(TargetRegisterInfo::isVirtualRegister(Reg)
|
|
|
502 && "Can only shrink virtual registers");
|
|
|
503 // Find all the values used, including PHI kills.
|
|
|
504 ShrinkToUsesWorkList WorkList;
|
|
|
505
|
|
|
506 // Visit all instructions reading Reg.
|
|
|
507 SlotIndex LastIdx;
|
|
|
508 for (MachineOperand &MO : MRI->reg_operands(Reg)) {
|
|
|
509 MachineInstr *UseMI = MO.getParent();
|
|
|
510 if (UseMI->isDebugValue())
|
|
|
511 continue;
|
|
|
512 // Maybe the operand is for a subregister we don't care about.
|
|
|
513 unsigned SubReg = MO.getSubReg();
|
|
|
514 if (SubReg != 0) {
|
|
|
515 unsigned SubRegMask = TRI->getSubRegIndexLaneMask(SubReg);
|
|
|
516 if ((SubRegMask & SR.LaneMask) == 0)
|
|
|
517 continue;
|
|
|
518 }
|
|
|
519 // We only need to visit each instruction once.
|
|
|
520 SlotIndex Idx = getInstructionIndex(UseMI).getRegSlot();
|
|
|
521 if (Idx == LastIdx)
|
|
|
522 continue;
|
|
|
523 LastIdx = Idx;
|
|
|
524
|
|
|
525 LiveQueryResult LRQ = SR.Query(Idx);
|
|
|
526 VNInfo *VNI = LRQ.valueIn();
|
|
|
527 // For Subranges it is possible that only undef values are left in that
|
|
|
528 // part of the subregister, so there is no real liverange at the use
|
|
|
529 if (!VNI)
|
|
|
530 continue;
|
|
|
531
|
|
|
532 // Special case: An early-clobber tied operand reads and writes the
|
|
|
533 // register one slot early.
|
|
|
534 if (VNInfo *DefVNI = LRQ.valueDefined())
|
|
|
535 Idx = DefVNI->def;
|
|
|
536
|
|
|
537 WorkList.push_back(std::make_pair(Idx, VNI));
|
|
|
538 }
|
|
|
539
|
|
|
540 // Create a new live ranges with only minimal live segments per def.
|
|
|
541 LiveRange NewLR;
|
|
|
542 createSegmentsForValues(NewLR, make_range(SR.vni_begin(), SR.vni_end()));
|
|
|
543 extendSegmentsToUses(NewLR, *Indexes, WorkList, SR);
|
|
|
544
|
|
|
545 // Move the trimmed ranges back.
|
|
|
546 SR.segments.swap(NewLR.segments);
|
|
|
547
|
|
|
548 // Remove dead PHI value numbers
|
|
|
549 for (auto VNI : SR.valnos) {
|
|
|
550 if (VNI->isUnused())
|
|
|
551 continue;
|
|
|
552 const LiveRange::Segment *Segment = SR.getSegmentContaining(VNI->def);
|
|
|
553 assert(Segment != nullptr && "Missing segment for VNI");
|
|
|
554 if (Segment->end != VNI->def.getDeadSlot())
|
|
|
555 continue;
|
|
|
556 if (VNI->isPHIDef()) {
|
|
|
557 // This is a dead PHI. Remove it.
|
|
|
558 VNI->markUnused();
|
|
|
559 SR.removeSegment(*Segment);
|
|
|
560 DEBUG(dbgs() << "Dead PHI at " << VNI->def << " may separate interval\n");
|
|
|
561 }
|
|
|
562 }
|
|
|
563
|
|
|
564 DEBUG(dbgs() << "Shrunk: " << SR << '\n');
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
565 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
566
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
567 void LiveIntervals::extendToIndices(LiveRange &LR,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
568 ArrayRef<SlotIndex> Indices) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
569 assert(LRCalc && "LRCalc not initialized.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
570 LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
571 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
572 LRCalc->extend(LR, Indices[i]);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
573 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
574
|
|
83
|
575 void LiveIntervals::pruneValue(LiveRange &LR, SlotIndex Kill,
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
576 SmallVectorImpl<SlotIndex> *EndPoints) {
|
|
83
|
577 LiveQueryResult LRQ = LR.Query(Kill);
|
|
|
578 VNInfo *VNI = LRQ.valueOutOrDead();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
579 if (!VNI)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
580 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
581
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
582 MachineBasicBlock *KillMBB = Indexes->getMBBFromIndex(Kill);
|
|
83
|
583 SlotIndex MBBEnd = Indexes->getMBBEndIdx(KillMBB);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
584
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
585 // If VNI isn't live out from KillMBB, the value is trivially pruned.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
586 if (LRQ.endPoint() < MBBEnd) {
|
|
83
|
587 LR.removeSegment(Kill, LRQ.endPoint());
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
588 if (EndPoints) EndPoints->push_back(LRQ.endPoint());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
589 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
590 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
591
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
592 // VNI is live out of KillMBB.
|
|
83
|
593 LR.removeSegment(Kill, MBBEnd);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
594 if (EndPoints) EndPoints->push_back(MBBEnd);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
595
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
596 // Find all blocks that are reachable from KillMBB without leaving VNI's live
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
597 // range. It is possible that KillMBB itself is reachable, so start a DFS
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
598 // from each successor.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
599 typedef SmallPtrSet<MachineBasicBlock*, 9> VisitedTy;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
600 VisitedTy Visited;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
601 for (MachineBasicBlock::succ_iterator
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
602 SuccI = KillMBB->succ_begin(), SuccE = KillMBB->succ_end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
603 SuccI != SuccE; ++SuccI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
604 for (df_ext_iterator<MachineBasicBlock*, VisitedTy>
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
605 I = df_ext_begin(*SuccI, Visited), E = df_ext_end(*SuccI, Visited);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
606 I != E;) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
607 MachineBasicBlock *MBB = *I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
608
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
609 // Check if VNI is live in to MBB.
|
|
83
|
610 SlotIndex MBBStart, MBBEnd;
|
|
77
|
611 std::tie(MBBStart, MBBEnd) = Indexes->getMBBRange(MBB);
|
|
83
|
612 LiveQueryResult LRQ = LR.Query(MBBStart);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
613 if (LRQ.valueIn() != VNI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
614 // This block isn't part of the VNI segment. Prune the search.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
615 I.skipChildren();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
616 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
617 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
618
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
619 // Prune the search if VNI is killed in MBB.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
620 if (LRQ.endPoint() < MBBEnd) {
|
|
83
|
621 LR.removeSegment(MBBStart, LRQ.endPoint());
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
622 if (EndPoints) EndPoints->push_back(LRQ.endPoint());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
623 I.skipChildren();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
624 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
625 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
626
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
627 // VNI is live through MBB.
|
|
83
|
628 LR.removeSegment(MBBStart, MBBEnd);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
629 if (EndPoints) EndPoints->push_back(MBBEnd);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
630 ++I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
631 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
632 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
633 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
634
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
635 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
636 // Register allocator hooks.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
637 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
638
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
639 void LiveIntervals::addKillFlags(const VirtRegMap *VRM) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
640 // Keep track of regunit ranges.
|
|
83
|
641 SmallVector<std::pair<const LiveRange*, LiveRange::const_iterator>, 8> RU;
|
|
|
642 // Keep track of subregister ranges.
|
|
|
643 SmallVector<std::pair<const LiveInterval::SubRange*,
|
|
|
644 LiveRange::const_iterator>, 4> SRs;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
645
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
646 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
647 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
648 if (MRI->reg_nodbg_empty(Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
649 continue;
|
|
83
|
650 const LiveInterval &LI = getInterval(Reg);
|
|
|
651 if (LI.empty())
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
652 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
653
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
654 // Find the regunit intervals for the assigned register. They may overlap
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
655 // the virtual register live range, cancelling any kills.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
656 RU.clear();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
657 for (MCRegUnitIterator Units(VRM->getPhys(Reg), TRI); Units.isValid();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
658 ++Units) {
|
|
83
|
659 const LiveRange &RURange = getRegUnit(*Units);
|
|
|
660 if (RURange.empty())
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
661 continue;
|
|
83
|
662 RU.push_back(std::make_pair(&RURange, RURange.find(LI.begin()->end)));
|
|
|
663 }
|
|
|
664
|
|
|
665 if (MRI->tracksSubRegLiveness()) {
|
|
|
666 SRs.clear();
|
|
|
667 for (const LiveInterval::SubRange &SR : LI.subranges()) {
|
|
|
668 SRs.push_back(std::make_pair(&SR, SR.find(LI.begin()->end)));
|
|
|
669 }
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
670 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
671
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
672 // Every instruction that kills Reg corresponds to a segment range end
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
673 // point.
|
|
83
|
674 for (LiveInterval::const_iterator RI = LI.begin(), RE = LI.end(); RI != RE;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
675 ++RI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
676 // A block index indicates an MBB edge.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
677 if (RI->end.isBlock())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
678 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
679 MachineInstr *MI = getInstructionFromIndex(RI->end);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
680 if (!MI)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
681 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
682
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
683 // Check if any of the regunits are live beyond the end of RI. That could
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
684 // happen when a physreg is defined as a copy of a virtreg:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
685 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
686 // %EAX = COPY %vreg5
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
687 // FOO %vreg5 <--- MI, cancel kill because %EAX is live.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
688 // BAR %EAX<kill>
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
689 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
690 // There should be no kill flag on FOO when %vreg5 is rewritten as %EAX.
|
|
83
|
691 for (auto &RUP : RU) {
|
|
|
692 const LiveRange &RURange = *RUP.first;
|
|
|
693 LiveRange::const_iterator &I = RUP.second;
|
|
|
694 if (I == RURange.end())
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
695 continue;
|
|
83
|
696 I = RURange.advanceTo(I, RI->end);
|
|
|
697 if (I == RURange.end() || I->start >= RI->end)
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
698 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
699 // I is overlapping RI.
|
|
83
|
700 goto CancelKill;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
701 }
|
|
83
|
702
|
|
|
703 if (MRI->tracksSubRegLiveness()) {
|
|
|
704 // When reading a partial undefined value we must not add a kill flag.
|
|
|
705 // The regalloc might have used the undef lane for something else.
|
|
|
706 // Example:
|
|
|
707 // %vreg1 = ... ; R32: %vreg1
|
|
|
708 // %vreg2:high16 = ... ; R64: %vreg2
|
|
|
709 // = read %vreg2<kill> ; R64: %vreg2
|
|
|
710 // = read %vreg1 ; R32: %vreg1
|
|
|
711 // The <kill> flag is correct for %vreg2, but the register allocator may
|
|
|
712 // assign R0L to %vreg1, and R0 to %vreg2 because the low 32bits of R0
|
|
|
713 // are actually never written by %vreg2. After assignment the <kill>
|
|
|
714 // flag at the read instruction is invalid.
|
|
|
715 unsigned DefinedLanesMask;
|
|
|
716 if (!SRs.empty()) {
|
|
|
717 // Compute a mask of lanes that are defined.
|
|
|
718 DefinedLanesMask = 0;
|
|
|
719 for (auto &SRP : SRs) {
|
|
|
720 const LiveInterval::SubRange &SR = *SRP.first;
|
|
|
721 LiveRange::const_iterator &I = SRP.second;
|
|
|
722 if (I == SR.end())
|
|
|
723 continue;
|
|
|
724 I = SR.advanceTo(I, RI->end);
|
|
|
725 if (I == SR.end() || I->start >= RI->end)
|
|
|
726 continue;
|
|
|
727 // I is overlapping RI
|
|
|
728 DefinedLanesMask |= SR.LaneMask;
|
|
|
729 }
|
|
|
730 } else
|
|
|
731 DefinedLanesMask = ~0u;
|
|
|
732
|
|
|
733 bool IsFullWrite = false;
|
|
|
734 for (const MachineOperand &MO : MI->operands()) {
|
|
|
735 if (!MO.isReg() || MO.getReg() != Reg)
|
|
|
736 continue;
|
|
|
737 if (MO.isUse()) {
|
|
|
738 // Reading any undefined lanes?
|
|
|
739 unsigned UseMask = TRI->getSubRegIndexLaneMask(MO.getSubReg());
|
|
|
740 if ((UseMask & ~DefinedLanesMask) != 0)
|
|
|
741 goto CancelKill;
|
|
|
742 } else if (MO.getSubReg() == 0) {
|
|
|
743 // Writing to the full register?
|
|
|
744 assert(MO.isDef());
|
|
|
745 IsFullWrite = true;
|
|
|
746 }
|
|
|
747 }
|
|
|
748
|
|
|
749 // If an instruction writes to a subregister, a new segment starts in
|
|
|
750 // the LiveInterval. But as this is only overriding part of the register
|
|
|
751 // adding kill-flags is not correct here after registers have been
|
|
|
752 // assigned.
|
|
|
753 if (!IsFullWrite) {
|
|
|
754 // Next segment has to be adjacent in the subregister write case.
|
|
|
755 LiveRange::const_iterator N = std::next(RI);
|
|
|
756 if (N != LI.end() && N->start == RI->end)
|
|
|
757 goto CancelKill;
|
|
|
758 }
|
|
|
759 }
|
|
|
760
|
|
|
761 MI->addRegisterKilled(Reg, nullptr);
|
|
|
762 continue;
|
|
|
763 CancelKill:
|
|
|
764 MI->clearRegisterKills(Reg, nullptr);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
765 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
766 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
767 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
768
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
769 MachineBasicBlock*
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
770 LiveIntervals::intervalIsInOneMBB(const LiveInterval &LI) const {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
771 // A local live range must be fully contained inside the block, meaning it is
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
772 // defined and killed at instructions, not at block boundaries. It is not
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
773 // live in or or out of any block.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
774 //
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
775 // It is technically possible to have a PHI-defined live range identical to a
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
776 // single block, but we are going to return false in that case.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
777
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
778 SlotIndex Start = LI.beginIndex();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
779 if (Start.isBlock())
|
|
77
|
780 return nullptr;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
781
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
782 SlotIndex Stop = LI.endIndex();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
783 if (Stop.isBlock())
|
|
77
|
784 return nullptr;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
785
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
786 // getMBBFromIndex doesn't need to search the MBB table when both indexes
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
787 // belong to proper instructions.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
788 MachineBasicBlock *MBB1 = Indexes->getMBBFromIndex(Start);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
789 MachineBasicBlock *MBB2 = Indexes->getMBBFromIndex(Stop);
|
|
77
|
790 return MBB1 == MBB2 ? MBB1 : nullptr;
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
791 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
792
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
793 bool
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
794 LiveIntervals::hasPHIKill(const LiveInterval &LI, const VNInfo *VNI) const {
|
|
83
|
795 for (const VNInfo *PHI : LI.valnos) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
796 if (PHI->isUnused() || !PHI->isPHIDef())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
797 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
798 const MachineBasicBlock *PHIMBB = getMBBFromIndex(PHI->def);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
799 // Conservatively return true instead of scanning huge predecessor lists.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
800 if (PHIMBB->pred_size() > 100)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
801 return true;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
802 for (MachineBasicBlock::const_pred_iterator
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
803 PI = PHIMBB->pred_begin(), PE = PHIMBB->pred_end(); PI != PE; ++PI)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
804 if (VNI == LI.getVNInfoBefore(Indexes->getMBBEndIdx(*PI)))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
805 return true;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
806 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
807 return false;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
808 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
809
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
810 float
|
|
77
|
811 LiveIntervals::getSpillWeight(bool isDef, bool isUse,
|
|
|
812 const MachineBlockFrequencyInfo *MBFI,
|
|
|
813 const MachineInstr *MI) {
|
|
|
814 BlockFrequency Freq = MBFI->getBlockFreq(MI->getParent());
|
|
|
815 const float Scale = 1.0f / MBFI->getEntryFreq();
|
|
|
816 return (isDef + isUse) * (Freq.getFrequency() * Scale);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
817 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
818
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
819 LiveRange::Segment
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
820 LiveIntervals::addSegmentToEndOfBlock(unsigned reg, MachineInstr* startInst) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
821 LiveInterval& Interval = createEmptyInterval(reg);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
822 VNInfo* VN = Interval.getNextValue(
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
823 SlotIndex(getInstructionIndex(startInst).getRegSlot()),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
824 getVNInfoAllocator());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
825 LiveRange::Segment S(
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
826 SlotIndex(getInstructionIndex(startInst).getRegSlot()),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
827 getMBBEndIdx(startInst->getParent()), VN);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
828 Interval.addSegment(S);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
829
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
830 return S;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
831 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
832
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
833
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
834 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
835 // Register mask functions
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
836 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
837
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
838 bool LiveIntervals::checkRegMaskInterference(LiveInterval &LI,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
839 BitVector &UsableRegs) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
840 if (LI.empty())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
841 return false;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
842 LiveInterval::iterator LiveI = LI.begin(), LiveE = LI.end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
843
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
844 // Use a smaller arrays for local live ranges.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
845 ArrayRef<SlotIndex> Slots;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
846 ArrayRef<const uint32_t*> Bits;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
847 if (MachineBasicBlock *MBB = intervalIsInOneMBB(LI)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
848 Slots = getRegMaskSlotsInBlock(MBB->getNumber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
849 Bits = getRegMaskBitsInBlock(MBB->getNumber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
850 } else {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
851 Slots = getRegMaskSlots();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
852 Bits = getRegMaskBits();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
853 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
854
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
855 // We are going to enumerate all the register mask slots contained in LI.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
856 // Start with a binary search of RegMaskSlots to find a starting point.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
857 ArrayRef<SlotIndex>::iterator SlotI =
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
858 std::lower_bound(Slots.begin(), Slots.end(), LiveI->start);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
859 ArrayRef<SlotIndex>::iterator SlotE = Slots.end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
860
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
861 // No slots in range, LI begins after the last call.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
862 if (SlotI == SlotE)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
863 return false;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
864
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
865 bool Found = false;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
866 for (;;) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
867 assert(*SlotI >= LiveI->start);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
868 // Loop over all slots overlapping this segment.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
869 while (*SlotI < LiveI->end) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
870 // *SlotI overlaps LI. Collect mask bits.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
871 if (!Found) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
872 // This is the first overlap. Initialize UsableRegs to all ones.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
873 UsableRegs.clear();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
874 UsableRegs.resize(TRI->getNumRegs(), true);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
875 Found = true;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
876 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
877 // Remove usable registers clobbered by this mask.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
878 UsableRegs.clearBitsNotInMask(Bits[SlotI-Slots.begin()]);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
879 if (++SlotI == SlotE)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
880 return Found;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
881 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
882 // *SlotI is beyond the current LI segment.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
883 LiveI = LI.advanceTo(LiveI, *SlotI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
884 if (LiveI == LiveE)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
885 return Found;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
886 // Advance SlotI until it overlaps.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
887 while (*SlotI < LiveI->start)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
888 if (++SlotI == SlotE)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
889 return Found;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
890 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
891 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
892
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
893 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
894 // IntervalUpdate class.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
895 //===----------------------------------------------------------------------===//
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
896
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
897 // HMEditor is a toolkit used by handleMove to trim or extend live intervals.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
898 class LiveIntervals::HMEditor {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
899 private:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
900 LiveIntervals& LIS;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
901 const MachineRegisterInfo& MRI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
902 const TargetRegisterInfo& TRI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
903 SlotIndex OldIdx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
904 SlotIndex NewIdx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
905 SmallPtrSet<LiveRange*, 8> Updated;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
906 bool UpdateFlags;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
907
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
908 public:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
909 HMEditor(LiveIntervals& LIS, const MachineRegisterInfo& MRI,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
910 const TargetRegisterInfo& TRI,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
911 SlotIndex OldIdx, SlotIndex NewIdx, bool UpdateFlags)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
912 : LIS(LIS), MRI(MRI), TRI(TRI), OldIdx(OldIdx), NewIdx(NewIdx),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
913 UpdateFlags(UpdateFlags) {}
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
914
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
915 // FIXME: UpdateFlags is a workaround that creates live intervals for all
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
916 // physregs, even those that aren't needed for regalloc, in order to update
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
917 // kill flags. This is wasteful. Eventually, LiveVariables will strip all kill
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
918 // flags, and postRA passes will use a live register utility instead.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
919 LiveRange *getRegUnitLI(unsigned Unit) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
920 if (UpdateFlags)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
921 return &LIS.getRegUnit(Unit);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
922 return LIS.getCachedRegUnit(Unit);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
923 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
924
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
925 /// Update all live ranges touched by MI, assuming a move from OldIdx to
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
926 /// NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
927 void updateAllRanges(MachineInstr *MI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
928 DEBUG(dbgs() << "handleMove " << OldIdx << " -> " << NewIdx << ": " << *MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
929 bool hasRegMask = false;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
930 for (MIOperands MO(MI); MO.isValid(); ++MO) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
931 if (MO->isRegMask())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
932 hasRegMask = true;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
933 if (!MO->isReg())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
934 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
935 // Aggressively clear all kill flags.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
936 // They are reinserted by VirtRegRewriter.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
937 if (MO->isUse())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
938 MO->setIsKill(false);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
939
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
940 unsigned Reg = MO->getReg();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
941 if (!Reg)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
942 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
943 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
944 LiveInterval &LI = LIS.getInterval(Reg);
|
|
83
|
945 if (LI.hasSubRanges()) {
|
|
|
946 unsigned SubReg = MO->getSubReg();
|
|
|
947 unsigned LaneMask = TRI.getSubRegIndexLaneMask(SubReg);
|
|
|
948 for (LiveInterval::SubRange &S : LI.subranges()) {
|
|
|
949 if ((S.LaneMask & LaneMask) == 0)
|
|
|
950 continue;
|
|
|
951 updateRange(S, Reg, S.LaneMask);
|
|
|
952 }
|
|
|
953 }
|
|
|
954 updateRange(LI, Reg, 0);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
955 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
956 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
957
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
958 // For physregs, only update the regunits that actually have a
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
959 // precomputed live range.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
960 for (MCRegUnitIterator Units(Reg, &TRI); Units.isValid(); ++Units)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
961 if (LiveRange *LR = getRegUnitLI(*Units))
|
|
83
|
962 updateRange(*LR, *Units, 0);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
963 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
964 if (hasRegMask)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
965 updateRegMaskSlots();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
966 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
967
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
968 private:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
969 /// Update a single live range, assuming an instruction has been moved from
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
970 /// OldIdx to NewIdx.
|
|
83
|
971 void updateRange(LiveRange &LR, unsigned Reg, unsigned LaneMask) {
|
|
|
972 if (!Updated.insert(&LR).second)
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
973 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
974 DEBUG({
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
975 dbgs() << " ";
|
|
83
|
976 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
977 dbgs() << PrintReg(Reg);
|
|
83
|
978 if (LaneMask != 0)
|
|
|
979 dbgs() << format(" L%04X", LaneMask);
|
|
|
980 } else {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
981 dbgs() << PrintRegUnit(Reg, &TRI);
|
|
83
|
982 }
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
983 dbgs() << ":\t" << LR << '\n';
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
984 });
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
985 if (SlotIndex::isEarlierInstr(OldIdx, NewIdx))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
986 handleMoveDown(LR);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
987 else
|
|
83
|
988 handleMoveUp(LR, Reg, LaneMask);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
989 DEBUG(dbgs() << " -->\t" << LR << '\n');
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
990 LR.verify();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
991 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
992
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
993 /// Update LR to reflect an instruction has been moved downwards from OldIdx
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
994 /// to NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
995 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
996 /// 1. Live def at OldIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
997 /// Move def to NewIdx, assert endpoint after NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
998 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
999 /// 2. Live def at OldIdx, killed at NewIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1000 /// Change to dead def at NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1001 /// (Happens when bundling def+kill together).
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1002 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1003 /// 3. Dead def at OldIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1004 /// Move def to NewIdx, possibly across another live value.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1005 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1006 /// 4. Def at OldIdx AND at NewIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1007 /// Remove segment [OldIdx;NewIdx) and value defined at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1008 /// (Happens when bundling multiple defs together).
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1009 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1010 /// 5. Value read at OldIdx, killed before NewIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1011 /// Extend kill to NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1012 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1013 void handleMoveDown(LiveRange &LR) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1014 // First look for a kill at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1015 LiveRange::iterator I = LR.find(OldIdx.getBaseIndex());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1016 LiveRange::iterator E = LR.end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1017 // Is LR even live at OldIdx?
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1018 if (I == E || SlotIndex::isEarlierInstr(OldIdx, I->start))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1019 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1020
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1021 // Handle a live-in value.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1022 if (!SlotIndex::isSameInstr(I->start, OldIdx)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1023 bool isKill = SlotIndex::isSameInstr(OldIdx, I->end);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1024 // If the live-in value already extends to NewIdx, there is nothing to do.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1025 if (!SlotIndex::isEarlierInstr(I->end, NewIdx))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1026 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1027 // Aggressively remove all kill flags from the old kill point.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1028 // Kill flags shouldn't be used while live intervals exist, they will be
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1029 // reinserted by VirtRegRewriter.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1030 if (MachineInstr *KillMI = LIS.getInstructionFromIndex(I->end))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1031 for (MIBundleOperands MO(KillMI); MO.isValid(); ++MO)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1032 if (MO->isReg() && MO->isUse())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1033 MO->setIsKill(false);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1034 // Adjust I->end to reach NewIdx. This may temporarily make LR invalid by
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1035 // overlapping ranges. Case 5 above.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1036 I->end = NewIdx.getRegSlot(I->end.isEarlyClobber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1037 // If this was a kill, there may also be a def. Otherwise we're done.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1038 if (!isKill)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1039 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1040 ++I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1041 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1042
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1043 // Check for a def at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1044 if (I == E || !SlotIndex::isSameInstr(OldIdx, I->start))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1045 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1046 // We have a def at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1047 VNInfo *DefVNI = I->valno;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1048 assert(DefVNI->def == I->start && "Inconsistent def");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1049 DefVNI->def = NewIdx.getRegSlot(I->start.isEarlyClobber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1050 // If the defined value extends beyond NewIdx, just move the def down.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1051 // This is case 1 above.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1052 if (SlotIndex::isEarlierInstr(NewIdx, I->end)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1053 I->start = DefVNI->def;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1054 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1055 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1056 // The remaining possibilities are now:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1057 // 2. Live def at OldIdx, killed at NewIdx: isSameInstr(I->end, NewIdx).
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1058 // 3. Dead def at OldIdx: I->end = OldIdx.getDeadSlot().
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1059 // In either case, it is possible that there is an existing def at NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1060 assert((I->end == OldIdx.getDeadSlot() ||
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1061 SlotIndex::isSameInstr(I->end, NewIdx)) &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1062 "Cannot move def below kill");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1063 LiveRange::iterator NewI = LR.advanceTo(I, NewIdx.getRegSlot());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1064 if (NewI != E && SlotIndex::isSameInstr(NewI->start, NewIdx)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1065 // There is an existing def at NewIdx, case 4 above. The def at OldIdx is
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1066 // coalesced into that value.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1067 assert(NewI->valno != DefVNI && "Multiple defs of value?");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1068 LR.removeValNo(DefVNI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1069 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1070 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1071 // There was no existing def at NewIdx. Turn *I into a dead def at NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1072 // If the def at OldIdx was dead, we allow it to be moved across other LR
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1073 // values. The new range should be placed immediately before NewI, move any
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1074 // intermediate ranges up.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1075 assert(NewI != I && "Inconsistent iterators");
|
|
77
|
1076 std::copy(std::next(I), NewI, I);
|
|
|
1077 *std::prev(NewI)
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1078 = LiveRange::Segment(DefVNI->def, NewIdx.getDeadSlot(), DefVNI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1079 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1080
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1081 /// Update LR to reflect an instruction has been moved upwards from OldIdx
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1082 /// to NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1083 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1084 /// 1. Live def at OldIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1085 /// Hoist def to NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1086 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1087 /// 2. Dead def at OldIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1088 /// Hoist def+end to NewIdx, possibly move across other values.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1089 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1090 /// 3. Dead def at OldIdx AND existing def at NewIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1091 /// Remove value defined at OldIdx, coalescing it with existing value.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1092 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1093 /// 4. Live def at OldIdx AND existing def at NewIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1094 /// Remove value defined at NewIdx, hoist OldIdx def to NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1095 /// (Happens when bundling multiple defs together).
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1096 ///
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1097 /// 5. Value killed at OldIdx:
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1098 /// Hoist kill to NewIdx, then scan for last kill between NewIdx and
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1099 /// OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1100 ///
|
|
83
|
1101 void handleMoveUp(LiveRange &LR, unsigned Reg, unsigned LaneMask) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1102 // First look for a kill at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1103 LiveRange::iterator I = LR.find(OldIdx.getBaseIndex());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1104 LiveRange::iterator E = LR.end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1105 // Is LR even live at OldIdx?
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1106 if (I == E || SlotIndex::isEarlierInstr(OldIdx, I->start))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1107 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1108
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1109 // Handle a live-in value.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1110 if (!SlotIndex::isSameInstr(I->start, OldIdx)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1111 // If the live-in value isn't killed here, there is nothing to do.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1112 if (!SlotIndex::isSameInstr(OldIdx, I->end))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1113 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1114 // Adjust I->end to end at NewIdx. If we are hoisting a kill above
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1115 // another use, we need to search for that use. Case 5 above.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1116 I->end = NewIdx.getRegSlot(I->end.isEarlyClobber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1117 ++I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1118 // If OldIdx also defines a value, there couldn't have been another use.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1119 if (I == E || !SlotIndex::isSameInstr(I->start, OldIdx)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1120 // No def, search for the new kill.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1121 // This can never be an early clobber kill since there is no def.
|
|
83
|
1122 std::prev(I)->end = findLastUseBefore(Reg, LaneMask).getRegSlot();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1123 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1124 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1125 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1126
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1127 // Now deal with the def at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1128 assert(I != E && SlotIndex::isSameInstr(I->start, OldIdx) && "No def?");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1129 VNInfo *DefVNI = I->valno;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1130 assert(DefVNI->def == I->start && "Inconsistent def");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1131 DefVNI->def = NewIdx.getRegSlot(I->start.isEarlyClobber());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1132
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1133 // Check for an existing def at NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1134 LiveRange::iterator NewI = LR.find(NewIdx.getRegSlot());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1135 if (SlotIndex::isSameInstr(NewI->start, NewIdx)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1136 assert(NewI->valno != DefVNI && "Same value defined more than once?");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1137 // There is an existing def at NewIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1138 if (I->end.isDead()) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1139 // Case 3: Remove the dead def at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1140 LR.removeValNo(DefVNI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1141 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1142 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1143 // Case 4: Replace def at NewIdx with live def at OldIdx.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1144 I->start = DefVNI->def;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1145 LR.removeValNo(NewI->valno);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1146 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1147 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1148
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1149 // There is no existing def at NewIdx. Hoist DefVNI.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1150 if (!I->end.isDead()) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1151 // Leave the end point of a live def.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1152 I->start = DefVNI->def;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1153 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1154 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1155
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1156 // DefVNI is a dead def. It may have been moved across other values in LR,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1157 // so move I up to NewI. Slide [NewI;I) down one position.
|
|
77
|
1158 std::copy_backward(NewI, I, std::next(I));
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1159 *NewI = LiveRange::Segment(DefVNI->def, NewIdx.getDeadSlot(), DefVNI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1160 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1161
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1162 void updateRegMaskSlots() {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1163 SmallVectorImpl<SlotIndex>::iterator RI =
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1164 std::lower_bound(LIS.RegMaskSlots.begin(), LIS.RegMaskSlots.end(),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1165 OldIdx);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1166 assert(RI != LIS.RegMaskSlots.end() && *RI == OldIdx.getRegSlot() &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1167 "No RegMask at OldIdx.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1168 *RI = NewIdx.getRegSlot();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1169 assert((RI == LIS.RegMaskSlots.begin() ||
|
|
77
|
1170 SlotIndex::isEarlierInstr(*std::prev(RI), *RI)) &&
|
|
|
1171 "Cannot move regmask instruction above another call");
|
|
|
1172 assert((std::next(RI) == LIS.RegMaskSlots.end() ||
|
|
|
1173 SlotIndex::isEarlierInstr(*RI, *std::next(RI))) &&
|
|
|
1174 "Cannot move regmask instruction below another call");
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1175 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1176
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1177 // Return the last use of reg between NewIdx and OldIdx.
|
|
83
|
1178 SlotIndex findLastUseBefore(unsigned Reg, unsigned LaneMask) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1179
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1180 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1181 SlotIndex LastUse = NewIdx;
|
|
83
|
1182 for (MachineOperand &MO : MRI.use_nodbg_operands(Reg)) {
|
|
|
1183 unsigned SubReg = MO.getSubReg();
|
|
|
1184 if (SubReg != 0 && LaneMask != 0
|
|
|
1185 && (TRI.getSubRegIndexLaneMask(SubReg) & LaneMask) == 0)
|
|
|
1186 continue;
|
|
|
1187
|
|
|
1188 const MachineInstr *MI = MO.getParent();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1189 SlotIndex InstSlot = LIS.getSlotIndexes()->getInstructionIndex(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1190 if (InstSlot > LastUse && InstSlot < OldIdx)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1191 LastUse = InstSlot;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1192 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1193 return LastUse;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1194 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1195
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1196 // This is a regunit interval, so scanning the use list could be very
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1197 // expensive. Scan upwards from OldIdx instead.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1198 assert(NewIdx < OldIdx && "Expected upwards move");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1199 SlotIndexes *Indexes = LIS.getSlotIndexes();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1200 MachineBasicBlock *MBB = Indexes->getMBBFromIndex(NewIdx);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1201
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1202 // OldIdx may not correspond to an instruction any longer, so set MII to
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1203 // point to the next instruction after OldIdx, or MBB->end().
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1204 MachineBasicBlock::iterator MII = MBB->end();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1205 if (MachineInstr *MI = Indexes->getInstructionFromIndex(
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1206 Indexes->getNextNonNullIndex(OldIdx)))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1207 if (MI->getParent() == MBB)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1208 MII = MI;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1209
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1210 MachineBasicBlock::iterator Begin = MBB->begin();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1211 while (MII != Begin) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1212 if ((--MII)->isDebugValue())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1213 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1214 SlotIndex Idx = Indexes->getInstructionIndex(MII);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1215
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1216 // Stop searching when NewIdx is reached.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1217 if (!SlotIndex::isEarlierInstr(NewIdx, Idx))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1218 return NewIdx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1219
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1220 // Check if MII uses Reg.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1221 for (MIBundleOperands MO(MII); MO.isValid(); ++MO)
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1222 if (MO->isReg() &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1223 TargetRegisterInfo::isPhysicalRegister(MO->getReg()) &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1224 TRI.hasRegUnit(MO->getReg(), Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1225 return Idx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1226 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1227 // Didn't reach NewIdx. It must be the first instruction in the block.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1228 return NewIdx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1229 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1230 };
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1231
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1232 void LiveIntervals::handleMove(MachineInstr* MI, bool UpdateFlags) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1233 assert(!MI->isBundled() && "Can't handle bundled instructions yet.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1234 SlotIndex OldIndex = Indexes->getInstructionIndex(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1235 Indexes->removeMachineInstrFromMaps(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1236 SlotIndex NewIndex = Indexes->insertMachineInstrInMaps(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1237 assert(getMBBStartIdx(MI->getParent()) <= OldIndex &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1238 OldIndex < getMBBEndIdx(MI->getParent()) &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1239 "Cannot handle moves across basic block boundaries.");
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1240
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1241 HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex, UpdateFlags);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1242 HME.updateAllRanges(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1243 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1244
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1245 void LiveIntervals::handleMoveIntoBundle(MachineInstr* MI,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1246 MachineInstr* BundleStart,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1247 bool UpdateFlags) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1248 SlotIndex OldIndex = Indexes->getInstructionIndex(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1249 SlotIndex NewIndex = Indexes->getInstructionIndex(BundleStart);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1250 HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex, UpdateFlags);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1251 HME.updateAllRanges(MI);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1252 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1253
|
|
83
|
1254 void LiveIntervals::repairOldRegInRange(const MachineBasicBlock::iterator Begin,
|
|
|
1255 const MachineBasicBlock::iterator End,
|
|
|
1256 const SlotIndex endIdx,
|
|
|
1257 LiveRange &LR, const unsigned Reg,
|
|
|
1258 const unsigned LaneMask) {
|
|
|
1259 LiveInterval::iterator LII = LR.find(endIdx);
|
|
|
1260 SlotIndex lastUseIdx;
|
|
|
1261 if (LII != LR.end() && LII->start < endIdx)
|
|
|
1262 lastUseIdx = LII->end;
|
|
|
1263 else
|
|
|
1264 --LII;
|
|
|
1265
|
|
|
1266 for (MachineBasicBlock::iterator I = End; I != Begin;) {
|
|
|
1267 --I;
|
|
|
1268 MachineInstr *MI = I;
|
|
|
1269 if (MI->isDebugValue())
|
|
|
1270 continue;
|
|
|
1271
|
|
|
1272 SlotIndex instrIdx = getInstructionIndex(MI);
|
|
|
1273 bool isStartValid = getInstructionFromIndex(LII->start);
|
|
|
1274 bool isEndValid = getInstructionFromIndex(LII->end);
|
|
|
1275
|
|
|
1276 // FIXME: This doesn't currently handle early-clobber or multiple removed
|
|
|
1277 // defs inside of the region to repair.
|
|
|
1278 for (MachineInstr::mop_iterator OI = MI->operands_begin(),
|
|
|
1279 OE = MI->operands_end(); OI != OE; ++OI) {
|
|
|
1280 const MachineOperand &MO = *OI;
|
|
|
1281 if (!MO.isReg() || MO.getReg() != Reg)
|
|
|
1282 continue;
|
|
|
1283
|
|
|
1284 unsigned SubReg = MO.getSubReg();
|
|
|
1285 unsigned Mask = TRI->getSubRegIndexLaneMask(SubReg);
|
|
|
1286 if ((Mask & LaneMask) == 0)
|
|
|
1287 continue;
|
|
|
1288
|
|
|
1289 if (MO.isDef()) {
|
|
|
1290 if (!isStartValid) {
|
|
|
1291 if (LII->end.isDead()) {
|
|
|
1292 SlotIndex prevStart;
|
|
|
1293 if (LII != LR.begin())
|
|
|
1294 prevStart = std::prev(LII)->start;
|
|
|
1295
|
|
|
1296 // FIXME: This could be more efficient if there was a
|
|
|
1297 // removeSegment method that returned an iterator.
|
|
|
1298 LR.removeSegment(*LII, true);
|
|
|
1299 if (prevStart.isValid())
|
|
|
1300 LII = LR.find(prevStart);
|
|
|
1301 else
|
|
|
1302 LII = LR.begin();
|
|
|
1303 } else {
|
|
|
1304 LII->start = instrIdx.getRegSlot();
|
|
|
1305 LII->valno->def = instrIdx.getRegSlot();
|
|
|
1306 if (MO.getSubReg() && !MO.isUndef())
|
|
|
1307 lastUseIdx = instrIdx.getRegSlot();
|
|
|
1308 else
|
|
|
1309 lastUseIdx = SlotIndex();
|
|
|
1310 continue;
|
|
|
1311 }
|
|
|
1312 }
|
|
|
1313
|
|
|
1314 if (!lastUseIdx.isValid()) {
|
|
|
1315 VNInfo *VNI = LR.getNextValue(instrIdx.getRegSlot(), VNInfoAllocator);
|
|
|
1316 LiveRange::Segment S(instrIdx.getRegSlot(),
|
|
|
1317 instrIdx.getDeadSlot(), VNI);
|
|
|
1318 LII = LR.addSegment(S);
|
|
|
1319 } else if (LII->start != instrIdx.getRegSlot()) {
|
|
|
1320 VNInfo *VNI = LR.getNextValue(instrIdx.getRegSlot(), VNInfoAllocator);
|
|
|
1321 LiveRange::Segment S(instrIdx.getRegSlot(), lastUseIdx, VNI);
|
|
|
1322 LII = LR.addSegment(S);
|
|
|
1323 }
|
|
|
1324
|
|
|
1325 if (MO.getSubReg() && !MO.isUndef())
|
|
|
1326 lastUseIdx = instrIdx.getRegSlot();
|
|
|
1327 else
|
|
|
1328 lastUseIdx = SlotIndex();
|
|
|
1329 } else if (MO.isUse()) {
|
|
|
1330 // FIXME: This should probably be handled outside of this branch,
|
|
|
1331 // either as part of the def case (for defs inside of the region) or
|
|
|
1332 // after the loop over the region.
|
|
|
1333 if (!isEndValid && !LII->end.isBlock())
|
|
|
1334 LII->end = instrIdx.getRegSlot();
|
|
|
1335 if (!lastUseIdx.isValid())
|
|
|
1336 lastUseIdx = instrIdx.getRegSlot();
|
|
|
1337 }
|
|
|
1338 }
|
|
|
1339 }
|
|
|
1340 }
|
|
|
1341
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1342 void
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1343 LiveIntervals::repairIntervalsInRange(MachineBasicBlock *MBB,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1344 MachineBasicBlock::iterator Begin,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1345 MachineBasicBlock::iterator End,
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1346 ArrayRef<unsigned> OrigRegs) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1347 // Find anchor points, which are at the beginning/end of blocks or at
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1348 // instructions that already have indexes.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1349 while (Begin != MBB->begin() && !Indexes->hasIndex(Begin))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1350 --Begin;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1351 while (End != MBB->end() && !Indexes->hasIndex(End))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1352 ++End;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1353
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1354 SlotIndex endIdx;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1355 if (End == MBB->end())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1356 endIdx = getMBBEndIdx(MBB).getPrevSlot();
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1357 else
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1358 endIdx = getInstructionIndex(End);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1359
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1360 Indexes->repairIndexesInRange(MBB, Begin, End);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1361
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1362 for (MachineBasicBlock::iterator I = End; I != Begin;) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1363 --I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1364 MachineInstr *MI = I;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1365 if (MI->isDebugValue())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1366 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1367 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1368 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1369 if (MOI->isReg() &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1370 TargetRegisterInfo::isVirtualRegister(MOI->getReg()) &&
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1371 !hasInterval(MOI->getReg())) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1372 createAndComputeVirtRegInterval(MOI->getReg());
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1373 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1374 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1375 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1376
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1377 for (unsigned i = 0, e = OrigRegs.size(); i != e; ++i) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1378 unsigned Reg = OrigRegs[i];
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1379 if (!TargetRegisterInfo::isVirtualRegister(Reg))
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1380 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1381
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1382 LiveInterval &LI = getInterval(Reg);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1383 // FIXME: Should we support undefs that gain defs?
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1384 if (!LI.hasAtLeastOneValue())
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1385 continue;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1386
|
|
83
|
1387 for (LiveInterval::SubRange &S : LI.subranges()) {
|
|
|
1388 repairOldRegInRange(Begin, End, endIdx, S, Reg, S.LaneMask);
|
|
|
1389 }
|
|
|
1390 repairOldRegInRange(Begin, End, endIdx, LI, Reg);
|
|
|
1391 }
|
|
|
1392 }
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1393
|
|
83
|
1394 void LiveIntervals::removePhysRegDefAt(unsigned Reg, SlotIndex Pos) {
|
|
|
1395 for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) {
|
|
|
1396 if (LiveRange *LR = getCachedRegUnit(*Units))
|
|
|
1397 if (VNInfo *VNI = LR->getVNInfoAt(Pos))
|
|
|
1398 LR->removeValNo(VNI);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1399 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
1400 }
|
|
83
|
1401
|
|
|
1402 void LiveIntervals::removeVRegDefAt(LiveInterval &LI, SlotIndex Pos) {
|
|
|
1403 VNInfo *VNI = LI.getVNInfoAt(Pos);
|
|
|
1404 if (VNI == nullptr)
|
|
|
1405 return;
|
|
|
1406 LI.removeValNo(VNI);
|
|
|
1407
|
|
|
1408 // Also remove the value in subranges.
|
|
|
1409 for (LiveInterval::SubRange &S : LI.subranges()) {
|
|
|
1410 if (VNInfo *SVNI = S.getVNInfoAt(Pos))
|
|
|
1411 S.removeValNo(SVNI);
|
|
|
1412 }
|
|
|
1413 LI.removeEmptySubRanges();
|
|
|
1414 }
|
