Mercurial > lcfOS
annotate python/ppci/codegen/registerallocator.py @ 312:2c9768114877
Added cool logging formatter
author | Windel Bouwman |
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date | Mon, 16 Dec 2013 17:58:15 +0100 |
parents | 0615b5308710 |
children | e9fe6988497c |
rev | line source |
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312 | 1 import logging |
296 | 2 from .flowgraph import FlowGraph |
3 from .interferencegraph import InterferenceGraph | |
269 | 4 |
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5 # Nifty first function: |
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6 first = lambda x: next(iter(x)) |
173 | 7 |
300 | 8 |
173 | 9 class RegisterAllocator: |
277 | 10 """ |
11 Target independent register allocator. | |
12 | |
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13 Algorithm is iterated register coalescing by Appel and George. |
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14 |
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15 Chaitin's algorithm: remove all nodes with less than K neighbours. |
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16 These nodes can be colored when added back. |
277 | 17 |
18 The process consists of the following steps: | |
19 - build interference graph from the instruction list | |
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20 - remove low degree non move related nodes. |
277 | 21 - (optional) coalesc registers to remove redundant moves |
22 - (optional) spill registers | |
23 - select registers | |
24 """ | |
312 | 25 def __init__(self): |
26 self.logger = logging.getLogger('registerallocator') | |
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27 |
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28 def InitData(self, f): |
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29 self.f = f |
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30 # Register information: |
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31 self.regs = set(f.regs) |
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32 self.K = len(self.regs) |
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33 |
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34 # Move related sets: |
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35 self.coalescedMoves = set() |
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36 self.constrainedMoves = set() |
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37 self.frozenMoves = set() |
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38 self.activeMoves = set() |
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39 self.worklistMoves = set() |
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40 |
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41 def Build(self): |
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42 """ 1. Construct interference graph from instruction list """ |
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43 self.f.cfg = FlowGraph(self.f.instructions) |
312 | 44 self.logger.info('Constructed flowgraph', extra={'ra_cfg':self.f.cfg}) |
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45 self.f.ig = InterferenceGraph(self.f.cfg) |
312 | 46 self.logger.info('Constructed interferencegraph', extra={'ra_ig':self.f.ig}) |
279 | 47 |
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48 self.Node = self.f.ig.getNode |
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49 |
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50 # Divide nodes into pre-colored and initial: |
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51 pre_tmp = list(self.f.tempMap.keys()) |
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52 self.precolored = set(self.Node(tmp) for tmp in pre_tmp) |
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53 self.workSet = set(self.f.ig.nodes - self.precolored) |
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54 |
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55 for n in self.precolored: |
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56 n.addDegree = 100 + len(self.f.ig.nodes) + self.K |
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57 |
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58 # Initialize color map: |
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59 self.color = {} |
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60 for tmp, c in self.f.tempMap.items(): |
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61 self.color[self.Node(tmp)] = c |
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62 |
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63 self.moves = [i for i in self.f.instructions if i.ismove] |
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64 for mv in self.moves: |
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65 self.Node(mv.src[0]).moves.add(mv) |
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66 self.Node(mv.dst[0]).moves.add(mv) |
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67 |
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68 def NodeMoves(self, n): |
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69 return n.moves & (self.activeMoves | self.worklistMoves) |
300 | 70 |
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71 def MoveRelated(self, n): |
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72 return bool(self.NodeMoves(n)) |
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73 |
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74 @property |
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75 def SpillWorkSet(self): |
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76 c = lambda n: n.Degree >= self.K |
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77 return set(filter(c, self.workSet)) |
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78 |
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79 @property |
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80 def FreezeWorkSet(self): |
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81 c = lambda n: n.Degree < self.K and self.MoveRelated(n) |
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82 return set(filter(c, self.workSet)) |
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83 |
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84 @property |
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85 def SimplifyWorkSet(self): |
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86 c = lambda n: n.Degree < self.K and not self.MoveRelated(n) |
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87 return set(filter(c, self.workSet)) |
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88 |
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89 def makeWorkList(self): |
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90 """ Divide initial nodes into worklists """ |
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91 self.selectStack = [] |
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92 |
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93 # Fill initial move set: |
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94 for m in self.moves: |
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95 self.worklistMoves.add(m) |
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96 |
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97 def Simplify(self): |
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98 """ 2. Remove nodes from the graph """ |
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99 n = first(self.SimplifyWorkSet) |
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100 self.workSet.remove(n) |
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101 self.selectStack.append(n) |
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102 # Pop out of graph: |
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103 self.f.ig.delNode(n) |
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104 |
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105 def EnableMoves(self, nodes): |
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106 for n in nodes: |
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107 for m in self.NodeMoves(n): |
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108 if m in self.activeMoves: |
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109 self.activeMoves.remove(m) |
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110 self.worklistMoves.add(m) |
300 | 111 |
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112 def Coalesc(self): |
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113 """ Coalesc conservative. """ |
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114 m = first(self.worklistMoves) |
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115 x = self.Node(m.dst[0]) |
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116 y = self.Node(m.src[0]) |
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117 u, v = (y, x) if y in self.precolored else (x, y) |
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118 self.worklistMoves.remove(m) |
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119 if u is v: |
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120 self.coalescedMoves.add(m) |
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121 elif v in self.precolored or self.f.ig.hasEdge(u, v): |
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122 self.constrainedMoves.add(m) |
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123 elif u not in self.precolored and self.Conservative(u, v): |
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124 self.coalescedMoves.add(m) |
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125 self.workSet.remove(v) |
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126 self.f.ig.Combine(u, v) |
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127 else: |
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128 self.activeMoves.add(m) |
300 | 129 |
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130 def Conservative(self, u, v): |
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131 """ Briggs conservative criteria for coalesc """ |
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132 nodes = u.Adjecent | v.Adjecent |
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133 c = lambda n: n.Degree >= self.K |
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134 k = len(list(filter(c, nodes))) |
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135 return k < self.K |
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136 |
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137 def Freeze(self): |
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138 """ Give up coalescing on some node """ |
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139 u = first(self.FreezeWorkSet) |
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140 self.freezeMoves(u) |
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141 |
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142 def freezeMoves(self, u): |
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143 """ Freeze moves for node u """ |
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144 for m in self.NodeMoves(u): |
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145 if m in self.activeMoves: |
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146 self.activeMoves.remove(m) |
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147 else: |
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148 sekf.worklistMoves.remove(m) |
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149 self.frozenMoves.add(m) |
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150 # Check other part of the move for still being move related: |
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151 v = m.src[0] if u is m.dst[0] else m.dst[0] |
300 | 152 |
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153 def SelectSpill(self): |
312 | 154 raise NotImplementedError("Spill is not implemented") |
277 | 155 |
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156 def AssignColors(self): |
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157 """ Add nodes back to the graph to color it. """ |
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158 while self.selectStack: |
312 | 159 n = self.selectStack.pop(-1) # Start with the last added |
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160 self.f.ig.addNode(n) |
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161 takenregs = set(self.color[m] for m in n.Adjecent) |
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162 okColors = self.regs - takenregs |
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163 if okColors: |
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164 self.color[n] = first(okColors) |
279 | 165 n.color = self.color[n] |
278
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166 else: |
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167 raise NotImplementedError('Spill required here!') |
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168 |
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169 def ApplyColors(self): |
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170 # Remove coalesced moves: |
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171 for mv in self.coalescedMoves: |
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172 self.f.instructions.remove(mv) |
279 | 173 |
277 | 174 # Use allocated registers: |
278
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175 lookup = lambda t: self.color[self.Node(t)] |
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176 for i in self.f.instructions: |
277 | 177 i.src = tuple(map(lookup, i.src)) |
178 i.dst = tuple(map(lookup, i.dst)) | |
179 | |
180 def allocFrame(self, f): | |
279 | 181 """ Do iterated register allocation for a single stack frame. """ |
278
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182 self.InitData(f) |
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183 self.Build() |
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184 self.makeWorkList() |
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185 while True: |
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186 if self.SimplifyWorkSet: |
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187 self.Simplify() |
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188 elif self.worklistMoves: |
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189 self.Coalesc() |
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190 elif self.FreezeWorkSet: |
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191 self.Freeze() |
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192 elif self.SpillWorkSet: |
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193 raise NotImplementedError('Spill not implemented') |
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194 else: |
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195 break # Done! |
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196 self.AssignColors() |
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197 self.ApplyColors() |