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annotate lib/CodeGen/SpillPlacement.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 54457678186b
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1 //===-- SpillPlacement.h - Optimal Spill Code Placement --------*- 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 // This analysis computes the optimal spill code placement between basic blocks.
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11 //
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12 // The runOnMachineFunction() method only precomputes some profiling information
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13 // about the CFG. The real work is done by prepare(), addConstraints(), and
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14 // finish() which are called by the register allocator.
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15 //
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16 // Given a variable that is live across multiple basic blocks, and given
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17 // constraints on the basic blocks where the variable is live, determine which
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18 // edge bundles should have the variable in a register and which edge bundles
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19 // should have the variable in a stack slot.
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20 //
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21 // The returned bit vector can be used to place optimal spill code at basic
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22 // block entries and exits. Spill code placement inside a basic block is not
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23 // considered.
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24 //
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25 //===----------------------------------------------------------------------===//
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26
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27 #ifndef LLVM_CODEGEN_SPILLPLACEMENT_H
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28 #define LLVM_CODEGEN_SPILLPLACEMENT_H
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29
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30 #include "llvm/ADT/ArrayRef.h"
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31 #include "llvm/ADT/SmallVector.h"
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32 #include "llvm/CodeGen/MachineFunctionPass.h"
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33 #include "llvm/Support/BlockFrequency.h"
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34
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35 namespace llvm {
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36
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37 class BitVector;
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38 class EdgeBundles;
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39 class MachineBasicBlock;
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40 class MachineLoopInfo;
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41
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42 class SpillPlacement : public MachineFunctionPass {
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43 struct Node;
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44 const MachineFunction *MF;
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45 const EdgeBundles *bundles;
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46 const MachineLoopInfo *loops;
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47 Node *nodes;
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48
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49 // Nodes that are active in the current computation. Owned by the prepare()
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50 // caller.
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51 BitVector *ActiveNodes;
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52
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53 // Nodes with active links. Populated by scanActiveBundles.
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54 SmallVector<unsigned, 8> Linked;
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55
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56 // Nodes that went positive during the last call to scanActiveBundles or
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57 // iterate.
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58 SmallVector<unsigned, 8> RecentPositive;
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59
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60 // Block frequencies are computed once. Indexed by block number.
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61 SmallVector<BlockFrequency, 4> BlockFrequencies;
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62
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63 public:
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64 static char ID; // Pass identification, replacement for typeid.
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65
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66 SpillPlacement() : MachineFunctionPass(ID), nodes(0) {}
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67 ~SpillPlacement() { releaseMemory(); }
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68
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69 /// BorderConstraint - A basic block has separate constraints for entry and
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70 /// exit.
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71 enum BorderConstraint {
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72 DontCare, ///< Block doesn't care / variable not live.
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73 PrefReg, ///< Block entry/exit prefers a register.
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74 PrefSpill, ///< Block entry/exit prefers a stack slot.
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75 PrefBoth, ///< Block entry prefers both register and stack.
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76 MustSpill ///< A register is impossible, variable must be spilled.
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77 };
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78
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79 /// BlockConstraint - Entry and exit constraints for a basic block.
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80 struct BlockConstraint {
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81 unsigned Number; ///< Basic block number (from MBB::getNumber()).
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82 BorderConstraint Entry : 8; ///< Constraint on block entry.
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83 BorderConstraint Exit : 8; ///< Constraint on block exit.
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84
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85 /// True when this block changes the value of the live range. This means
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86 /// the block has a non-PHI def. When this is false, a live-in value on
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87 /// the stack can be live-out on the stack without inserting a spill.
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88 bool ChangesValue;
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89 };
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90
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91 /// prepare - Reset state and prepare for a new spill placement computation.
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92 /// @param RegBundles Bit vector to receive the edge bundles where the
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93 /// variable should be kept in a register. Each bit
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94 /// corresponds to an edge bundle, a set bit means the
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95 /// variable should be kept in a register through the
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96 /// bundle. A clear bit means the variable should be
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97 /// spilled. This vector is retained.
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98 void prepare(BitVector &RegBundles);
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99
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100 /// addConstraints - Add constraints and biases. This method may be called
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101 /// more than once to accumulate constraints.
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102 /// @param LiveBlocks Constraints for blocks that have the variable live in or
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103 /// live out.
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104 void addConstraints(ArrayRef<BlockConstraint> LiveBlocks);
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105
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106 /// addPrefSpill - Add PrefSpill constraints to all blocks listed. This is
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107 /// equivalent to calling addConstraint with identical BlockConstraints with
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108 /// Entry = Exit = PrefSpill, and ChangesValue = false.
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109 ///
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110 /// @param Blocks Array of block numbers that prefer to spill in and out.
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111 /// @param Strong When true, double the negative bias for these blocks.
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112 void addPrefSpill(ArrayRef<unsigned> Blocks, bool Strong);
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113
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114 /// addLinks - Add transparent blocks with the given numbers.
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115 void addLinks(ArrayRef<unsigned> Links);
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116
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117 /// scanActiveBundles - Perform an initial scan of all bundles activated by
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118 /// addConstraints and addLinks, updating their state. Add all the bundles
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119 /// that now prefer a register to RecentPositive.
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120 /// Prepare internal data structures for iterate.
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121 /// Return true is there are any positive nodes.
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122 bool scanActiveBundles();
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123
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124 /// iterate - Update the network iteratively until convergence, or new bundles
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125 /// are found.
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126 void iterate();
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127
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128 /// getRecentPositive - Return an array of bundles that became positive during
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129 /// the previous call to scanActiveBundles or iterate.
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130 ArrayRef<unsigned> getRecentPositive() { return RecentPositive; }
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131
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132 /// finish - Compute the optimal spill code placement given the
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133 /// constraints. No MustSpill constraints will be violated, and the smallest
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134 /// possible number of PrefX constraints will be violated, weighted by
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135 /// expected execution frequencies.
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136 /// The selected bundles are returned in the bitvector passed to prepare().
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137 /// @return True if a perfect solution was found, allowing the variable to be
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138 /// in a register through all relevant bundles.
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139 bool finish();
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140
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141 /// getBlockFrequency - Return the estimated block execution frequency per
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142 /// function invocation.
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143 BlockFrequency getBlockFrequency(unsigned Number) const {
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144 return BlockFrequencies[Number];
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145 }
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146
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147 private:
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148 virtual bool runOnMachineFunction(MachineFunction&);
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149 virtual void getAnalysisUsage(AnalysisUsage&) const;
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150 virtual void releaseMemory();
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151
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152 void activate(unsigned);
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153 };
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154
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155 } // end namespace llvm
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156
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157 #endif