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annotate lib/CodeGen/LiveRangeCalc.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children c2174574ed3a
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1 //===- LiveRangeCalc.h - Calculate live ranges ------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // The LiveRangeCalc class can be used to compute live ranges from scratch. It
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11 // caches information about values in the CFG to speed up repeated operations
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12 // on the same live range. The cache can be shared by non-overlapping live
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13 // ranges. SplitKit uses that when computing the live range of split products.
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14 //
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15 // A low-level interface is available to clients that know where a variable is
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16 // live, but don't know which value it has as every point. LiveRangeCalc will
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17 // propagate values down the dominator tree, and even insert PHI-defs where
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18 // needed. SplitKit uses this faster interface when possible.
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19 //
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20 //===----------------------------------------------------------------------===//
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21
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22 #ifndef LLVM_LIB_CODEGEN_LIVERANGECALC_H
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23 #define LLVM_LIB_CODEGEN_LIVERANGECALC_H
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24
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25 #include "llvm/ADT/ArrayRef.h"
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26 #include "llvm/ADT/BitVector.h"
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27 #include "llvm/ADT/DenseMap.h"
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28 #include "llvm/ADT/IndexedMap.h"
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29 #include "llvm/ADT/SmallVector.h"
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30 #include "llvm/CodeGen/LiveInterval.h"
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31 #include "llvm/CodeGen/MachineBasicBlock.h"
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32 #include "llvm/CodeGen/SlotIndexes.h"
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33 #include "llvm/MC/LaneBitmask.h"
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34 #include <utility>
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35
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36 namespace llvm {
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37
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38 template <class NodeT> class DomTreeNodeBase;
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39 class MachineDominatorTree;
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40 class MachineFunction;
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41 class MachineRegisterInfo;
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42
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43 using MachineDomTreeNode = DomTreeNodeBase<MachineBasicBlock>;
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44
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45 class LiveRangeCalc {
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46 const MachineFunction *MF = nullptr;
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47 const MachineRegisterInfo *MRI = nullptr;
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48 SlotIndexes *Indexes = nullptr;
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49 MachineDominatorTree *DomTree = nullptr;
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50 VNInfo::Allocator *Alloc = nullptr;
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51
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52 /// LiveOutPair - A value and the block that defined it. The domtree node is
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53 /// redundant, it can be computed as: MDT[Indexes.getMBBFromIndex(VNI->def)].
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54 using LiveOutPair = std::pair<VNInfo *, MachineDomTreeNode *>;
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55
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56 /// LiveOutMap - Map basic blocks to the value leaving the block.
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57 using LiveOutMap = IndexedMap<LiveOutPair, MBB2NumberFunctor>;
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58
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59 /// Bit vector of active entries in LiveOut, also used as a visited set by
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60 /// findReachingDefs. One entry per basic block, indexed by block number.
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61 /// This is kept as a separate bit vector because it can be cleared quickly
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62 /// when switching live ranges.
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63 BitVector Seen;
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64
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65 /// Map LiveRange to sets of blocks (represented by bit vectors) that
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66 /// in the live range are defined on entry and undefined on entry.
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67 /// A block is defined on entry if there is a path from at least one of
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68 /// the defs in the live range to the entry of the block, and conversely,
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69 /// a block is undefined on entry, if there is no such path (i.e. no
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70 /// definition reaches the entry of the block). A single LiveRangeCalc
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71 /// object is used to track live-out information for multiple registers
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72 /// in live range splitting (which is ok, since the live ranges of these
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73 /// registers do not overlap), but the defined/undefined information must
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74 /// be kept separate for each individual range.
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75 /// By convention, EntryInfoMap[&LR] = { Defined, Undefined }.
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76 using EntryInfoMap = DenseMap<LiveRange *, std::pair<BitVector, BitVector>>;
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77 EntryInfoMap EntryInfos;
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78
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79 /// Map each basic block where a live range is live out to the live-out value
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80 /// and its defining block.
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81 ///
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82 /// For every basic block, MBB, one of these conditions shall be true:
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83 ///
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84 /// 1. !Seen.count(MBB->getNumber())
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85 /// Blocks without a Seen bit are ignored.
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86 /// 2. LiveOut[MBB].second.getNode() == MBB
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87 /// The live-out value is defined in MBB.
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88 /// 3. forall P in preds(MBB): LiveOut[P] == LiveOut[MBB]
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89 /// The live-out value passses through MBB. All predecessors must carry
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90 /// the same value.
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91 ///
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92 /// The domtree node may be null, it can be computed.
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93 ///
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94 /// The map can be shared by multiple live ranges as long as no two are
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95 /// live-out of the same block.
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96 LiveOutMap Map;
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97
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98 /// LiveInBlock - Information about a basic block where a live range is known
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99 /// to be live-in, but the value has not yet been determined.
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100 struct LiveInBlock {
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101 // The live range set that is live-in to this block. The algorithms can
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102 // handle multiple non-overlapping live ranges simultaneously.
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103 LiveRange &LR;
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104
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105 // DomNode - Dominator tree node for the block.
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106 // Cleared when the final value has been determined and LI has been updated.
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107 MachineDomTreeNode *DomNode;
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108
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109 // Position in block where the live-in range ends, or SlotIndex() if the
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110 // range passes through the block. When the final value has been
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111 // determined, the range from the block start to Kill will be added to LI.
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112 SlotIndex Kill;
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113
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114 // Live-in value filled in by updateSSA once it is known.
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115 VNInfo *Value = nullptr;
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116
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117 LiveInBlock(LiveRange &LR, MachineDomTreeNode *node, SlotIndex kill)
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118 : LR(LR), DomNode(node), Kill(kill) {}
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119 };
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120
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121 /// LiveIn - Work list of blocks where the live-in value has yet to be
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122 /// determined. This list is typically computed by findReachingDefs() and
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123 /// used as a work list by updateSSA(). The low-level interface may also be
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124 /// used to add entries directly.
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125 SmallVector<LiveInBlock, 16> LiveIn;
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126
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127 /// Check if the entry to block @p MBB can be reached by any of the defs
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128 /// in @p LR. Return true if none of the defs reach the entry to @p MBB.
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129 bool isDefOnEntry(LiveRange &LR, ArrayRef<SlotIndex> Undefs,
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130 MachineBasicBlock &MBB, BitVector &DefOnEntry,
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131 BitVector &UndefOnEntry);
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132
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133 /// Find the set of defs that can reach @p Kill. @p Kill must belong to
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134 /// @p UseMBB.
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135 ///
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136 /// If exactly one def can reach @p UseMBB, and the def dominates @p Kill,
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137 /// all paths from the def to @p UseMBB are added to @p LR, and the function
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138 /// returns true.
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139 ///
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140 /// If multiple values can reach @p UseMBB, the blocks that need @p LR to be
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141 /// live in are added to the LiveIn array, and the function returns false.
0
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142 ///
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143 /// The array @p Undef provides the locations where the range @p LR becomes
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144 /// undefined by <def,read-undef> operands on other subranges. If @p Undef
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145 /// is non-empty and @p Kill is jointly dominated only by the entries of
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146 /// @p Undef, the function returns false.
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147 ///
0
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148 /// PhysReg, when set, is used to verify live-in lists on basic blocks.
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149 bool findReachingDefs(LiveRange &LR, MachineBasicBlock &UseMBB,
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150 SlotIndex Kill, unsigned PhysReg,
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151 ArrayRef<SlotIndex> Undefs);
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152
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153 /// updateSSA - Compute the values that will be live in to all requested
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154 /// blocks in LiveIn. Create PHI-def values as required to preserve SSA form.
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155 ///
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156 /// Every live-in block must be jointly dominated by the added live-out
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157 /// blocks. No values are read from the live ranges.
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158 void updateSSA();
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159
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160 /// Transfer information from the LiveIn vector to the live ranges and update
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161 /// the given @p LiveOuts.
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162 void updateFromLiveIns();
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163
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164 /// Extend the live range of @p LR to reach all uses of Reg.
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165 ///
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166 /// If @p LR is a main range, or if @p LI is null, then all uses must be
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167 /// jointly dominated by the definitions from @p LR. If @p LR is a subrange
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168 /// of the live interval @p LI, corresponding to lane mask @p LaneMask,
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169 /// all uses must be jointly dominated by the definitions from @p LR
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170 /// together with definitions of other lanes where @p LR becomes undefined
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171 /// (via <def,read-undef> operands).
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172 /// If @p LR is a main range, the @p LaneMask should be set to ~0, i.e.
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173 /// LaneBitmask::getAll().
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174 void extendToUses(LiveRange &LR, unsigned Reg, LaneBitmask LaneMask,
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175 LiveInterval *LI = nullptr);
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176
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177 /// Reset Map and Seen fields.
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178 void resetLiveOutMap();
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179
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180 public:
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181 LiveRangeCalc() = default;
0
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182
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183 //===--------------------------------------------------------------------===//
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184 // High-level interface.
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185 //===--------------------------------------------------------------------===//
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186 //
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187 // Calculate live ranges from scratch.
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188 //
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189
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190 /// reset - Prepare caches for a new set of non-overlapping live ranges. The
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191 /// caches must be reset before attempting calculations with a live range
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192 /// that may overlap a previously computed live range, and before the first
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193 /// live range in a function. If live ranges are not known to be
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194 /// non-overlapping, call reset before each.
121
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195 void reset(const MachineFunction *mf, SlotIndexes *SI,
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196 MachineDominatorTree *MDT, VNInfo::Allocator *VNIA);
0
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197
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198 //===--------------------------------------------------------------------===//
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199 // Mid-level interface.
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200 //===--------------------------------------------------------------------===//
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201 //
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202 // Modify existing live ranges.
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203 //
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204
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205 /// Extend the live range of @p LR to reach @p Use.
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206 ///
83
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207 /// The existing values in @p LR must be live so they jointly dominate @p Use.
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208 /// If @p Use is not dominated by a single existing value, PHI-defs are
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209 /// inserted as required to preserve SSA form.
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210 ///
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211 /// PhysReg, when set, is used to verify live-in lists on basic blocks.
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212 void extend(LiveRange &LR, SlotIndex Use, unsigned PhysReg,
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213 ArrayRef<SlotIndex> Undefs);
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214
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215 /// createDeadDefs - Create a dead def in LI for every def operand of Reg.
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216 /// Each instruction defining Reg gets a new VNInfo with a corresponding
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217 /// minimal live range.
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218 void createDeadDefs(LiveRange &LR, unsigned Reg);
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219
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220 /// Extend the live range of @p LR to reach all uses of Reg.
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221 ///
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222 /// All uses must be jointly dominated by existing liveness. PHI-defs are
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223 /// inserted as needed to preserve SSA form.
83
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224 void extendToUses(LiveRange &LR, unsigned PhysReg) {
121
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225 extendToUses(LR, PhysReg, LaneBitmask::getAll());
83
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226 }
0
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227
83
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228 /// Calculates liveness for the register specified in live interval @p LI.
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229 /// Creates subregister live ranges as needed if subreg liveness tracking is
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230 /// enabled.
95
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231 void calculate(LiveInterval &LI, bool TrackSubRegs);
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232
120
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233 /// For live interval \p LI with correct SubRanges construct matching
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234 /// information for the main live range. Expects the main live range to not
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235 /// have any segments or value numbers.
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236 void constructMainRangeFromSubranges(LiveInterval &LI);
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237
0
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238 //===--------------------------------------------------------------------===//
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239 // Low-level interface.
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diff changeset
240 //===--------------------------------------------------------------------===//
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241 //
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242 // These functions can be used to compute live ranges where the live-in and
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243 // live-out blocks are already known, but the SSA value in each block is
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244 // unknown.
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245 //
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246 // After calling reset(), add known live-out values and known live-in blocks.
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247 // Then call calculateValues() to compute the actual value that is
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248 // live-in to each block, and add liveness to the live ranges.
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diff changeset
249 //
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diff changeset
250
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251 /// setLiveOutValue - Indicate that VNI is live out from MBB. The
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252 /// calculateValues() function will not add liveness for MBB, the caller
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253 /// should take care of that.
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diff changeset
254 ///
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255 /// VNI may be null only if MBB is a live-through block also passed to
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256 /// addLiveInBlock().
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diff changeset
257 void setLiveOutValue(MachineBasicBlock *MBB, VNInfo *VNI) {
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diff changeset
258 Seen.set(MBB->getNumber());
83
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259 Map[MBB] = LiveOutPair(VNI, nullptr);
0
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diff changeset
260 }
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diff changeset
261
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262 /// addLiveInBlock - Add a block with an unknown live-in value. This
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diff changeset
263 /// function can only be called once per basic block. Once the live-in value
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diff changeset
264 /// has been determined, calculateValues() will add liveness to LI.
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265 ///
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266 /// @param LR The live range that is live-in to the block.
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267 /// @param DomNode The domtree node for the block.
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268 /// @param Kill Index in block where LI is killed. If the value is
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269 /// live-through, set Kill = SLotIndex() and also call
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270 /// setLiveOutValue(MBB, 0).
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271 void addLiveInBlock(LiveRange &LR,
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272 MachineDomTreeNode *DomNode,
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273 SlotIndex Kill = SlotIndex()) {
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diff changeset
274 LiveIn.push_back(LiveInBlock(LR, DomNode, Kill));
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parents:
diff changeset
275 }
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276
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277 /// calculateValues - Calculate the value that will be live-in to each block
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278 /// added with addLiveInBlock. Add PHI-def values as needed to preserve SSA
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279 /// form. Add liveness to all live-in blocks up to the Kill point, or the
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280 /// whole block for live-through blocks.
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281 ///
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282 /// Every predecessor of a live-in block must have been given a value with
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283 /// setLiveOutValue, the value may be null for live-trough blocks.
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284 void calculateValues();
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285 };
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286
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287 } // end namespace llvm
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288
121
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289 #endif // LLVM_LIB_CODEGEN_LIVERANGECALC_H