Mercurial > hg > CbC > CbC_llvm

annotate utils/TableGen/SetTheory.cpp @ 15:66597e792247

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minor fix
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 17 Sep 2013 21:32:34 +0900
parents 9ad51c7bc036
children
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1 //===- SetTheory.cpp - Generate ordered sets from DAG expressions ---------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the SetTheory class that computes ordered sets of
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11 // Records from DAG expressions.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "SetTheory.h"
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16 #include "llvm/Support/Format.h"
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17 #include "llvm/TableGen/Error.h"
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18 #include "llvm/TableGen/Record.h"
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19
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20 using namespace llvm;
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21
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22 // Define the standard operators.
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23 namespace {
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24
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25 typedef SetTheory::RecSet RecSet;
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26 typedef SetTheory::RecVec RecVec;
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27
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28 // (add a, b, ...) Evaluate and union all arguments.
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29 struct AddOp : public SetTheory::Operator {
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30 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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31 ST.evaluate(Expr->arg_begin(), Expr->arg_end(), Elts, Loc);
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32 }
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33 };
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34
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35 // (sub Add, Sub, ...) Set difference.
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36 struct SubOp : public SetTheory::Operator {
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37 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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38 if (Expr->arg_size() < 2)
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39 PrintFatalError(Loc, "Set difference needs at least two arguments: " +
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40 Expr->getAsString());
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41 RecSet Add, Sub;
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42 ST.evaluate(*Expr->arg_begin(), Add, Loc);
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43 ST.evaluate(Expr->arg_begin() + 1, Expr->arg_end(), Sub, Loc);
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44 for (RecSet::iterator I = Add.begin(), E = Add.end(); I != E; ++I)
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45 if (!Sub.count(*I))
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46 Elts.insert(*I);
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47 }
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48 };
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49
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50 // (and S1, S2) Set intersection.
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51 struct AndOp : public SetTheory::Operator {
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52 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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53 if (Expr->arg_size() != 2)
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54 PrintFatalError(Loc, "Set intersection requires two arguments: " +
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55 Expr->getAsString());
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56 RecSet S1, S2;
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57 ST.evaluate(Expr->arg_begin()[0], S1, Loc);
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58 ST.evaluate(Expr->arg_begin()[1], S2, Loc);
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59 for (RecSet::iterator I = S1.begin(), E = S1.end(); I != E; ++I)
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60 if (S2.count(*I))
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61 Elts.insert(*I);
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62 }
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63 };
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64
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65 // SetIntBinOp - Abstract base class for (Op S, N) operators.
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66 struct SetIntBinOp : public SetTheory::Operator {
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67 virtual void apply2(SetTheory &ST, DagInit *Expr,
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68 RecSet &Set, int64_t N,
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69 RecSet &Elts, ArrayRef<SMLoc> Loc) =0;
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70
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71 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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72 if (Expr->arg_size() != 2)
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73 PrintFatalError(Loc, "Operator requires (Op Set, Int) arguments: " +
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74 Expr->getAsString());
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75 RecSet Set;
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76 ST.evaluate(Expr->arg_begin()[0], Set, Loc);
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77 IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[1]);
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78 if (!II)
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79 PrintFatalError(Loc, "Second argument must be an integer: " +
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80 Expr->getAsString());
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81 apply2(ST, Expr, Set, II->getValue(), Elts, Loc);
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82 }
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83 };
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84
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85 // (shl S, N) Shift left, remove the first N elements.
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86 struct ShlOp : public SetIntBinOp {
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87 void apply2(SetTheory &ST, DagInit *Expr,
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88 RecSet &Set, int64_t N,
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89 RecSet &Elts, ArrayRef<SMLoc> Loc) {
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90 if (N < 0)
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91 PrintFatalError(Loc, "Positive shift required: " +
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92 Expr->getAsString());
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93 if (unsigned(N) < Set.size())
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94 Elts.insert(Set.begin() + N, Set.end());
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95 }
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96 };
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97
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98 // (trunc S, N) Truncate after the first N elements.
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99 struct TruncOp : public SetIntBinOp {
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100 void apply2(SetTheory &ST, DagInit *Expr,
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101 RecSet &Set, int64_t N,
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102 RecSet &Elts, ArrayRef<SMLoc> Loc) {
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103 if (N < 0)
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104 PrintFatalError(Loc, "Positive length required: " +
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105 Expr->getAsString());
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106 if (unsigned(N) > Set.size())
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107 N = Set.size();
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108 Elts.insert(Set.begin(), Set.begin() + N);
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109 }
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110 };
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111
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112 // Left/right rotation.
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113 struct RotOp : public SetIntBinOp {
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114 const bool Reverse;
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115
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116 RotOp(bool Rev) : Reverse(Rev) {}
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117
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118 void apply2(SetTheory &ST, DagInit *Expr,
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119 RecSet &Set, int64_t N,
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diff changeset
120 RecSet &Elts, ArrayRef<SMLoc> Loc) {
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121 if (Reverse)
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122 N = -N;
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123 // N > 0 -> rotate left, N < 0 -> rotate right.
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124 if (Set.empty())
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125 return;
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126 if (N < 0)
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127 N = Set.size() - (-N % Set.size());
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128 else
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129 N %= Set.size();
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130 Elts.insert(Set.begin() + N, Set.end());
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131 Elts.insert(Set.begin(), Set.begin() + N);
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132 }
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133 };
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134
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135 // (decimate S, N) Pick every N'th element of S.
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136 struct DecimateOp : public SetIntBinOp {
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137 void apply2(SetTheory &ST, DagInit *Expr,
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138 RecSet &Set, int64_t N,
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139 RecSet &Elts, ArrayRef<SMLoc> Loc) {
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140 if (N <= 0)
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141 PrintFatalError(Loc, "Positive stride required: " +
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142 Expr->getAsString());
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143 for (unsigned I = 0; I < Set.size(); I += N)
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144 Elts.insert(Set[I]);
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145 }
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146 };
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147
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148 // (interleave S1, S2, ...) Interleave elements of the arguments.
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149 struct InterleaveOp : public SetTheory::Operator {
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150 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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151 // Evaluate the arguments individually.
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152 SmallVector<RecSet, 4> Args(Expr->getNumArgs());
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153 unsigned MaxSize = 0;
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154 for (unsigned i = 0, e = Expr->getNumArgs(); i != e; ++i) {
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155 ST.evaluate(Expr->getArg(i), Args[i], Loc);
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156 MaxSize = std::max(MaxSize, unsigned(Args[i].size()));
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157 }
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158 // Interleave arguments into Elts.
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159 for (unsigned n = 0; n != MaxSize; ++n)
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160 for (unsigned i = 0, e = Expr->getNumArgs(); i != e; ++i)
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161 if (n < Args[i].size())
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162 Elts.insert(Args[i][n]);
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163 }
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164 };
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165
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166 // (sequence "Format", From, To) Generate a sequence of records by name.
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167 struct SequenceOp : public SetTheory::Operator {
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168 void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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169 int Step = 1;
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170 if (Expr->arg_size() > 4)
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171 PrintFatalError(Loc, "Bad args to (sequence \"Format\", From, To): " +
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172 Expr->getAsString());
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173 else if (Expr->arg_size() == 4) {
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174 if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[3])) {
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175 Step = II->getValue();
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176 } else
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177 PrintFatalError(Loc, "Stride must be an integer: " +
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178 Expr->getAsString());
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179 }
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180
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181 std::string Format;
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diff changeset
182 if (StringInit *SI = dyn_cast<StringInit>(Expr->arg_begin()[0]))
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183 Format = SI->getValue();
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184 else
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185 PrintFatalError(Loc, "Format must be a string: " + Expr->getAsString());
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186
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187 int64_t From, To;
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188 if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[1]))
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189 From = II->getValue();
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190 else
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191 PrintFatalError(Loc, "From must be an integer: " + Expr->getAsString());
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192 if (From < 0 || From >= (1 << 30))
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193 PrintFatalError(Loc, "From out of range");
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194
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195 if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[2]))
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196 To = II->getValue();
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197 else
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198 PrintFatalError(Loc, "From must be an integer: " + Expr->getAsString());
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199 if (To < 0 || To >= (1 << 30))
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200 PrintFatalError(Loc, "To out of range");
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201
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202 RecordKeeper &Records =
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203 cast<DefInit>(Expr->getOperator())->getDef()->getRecords();
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204
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205 Step *= From <= To ? 1 : -1;
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206 while (true) {
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207 if (Step > 0 && From > To)
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208 break;
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209 else if (Step < 0 && From < To)
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210 break;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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211 std::string Name;
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212 raw_string_ostream OS(Name);
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213 OS << format(Format.c_str(), unsigned(From));
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214 Record *Rec = Records.getDef(OS.str());
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215 if (!Rec)
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216 PrintFatalError(Loc, "No def named '" + Name + "': " +
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217 Expr->getAsString());
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218 // Try to reevaluate Rec in case it is a set.
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219 if (const RecVec *Result = ST.expand(Rec))
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220 Elts.insert(Result->begin(), Result->end());
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221 else
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222 Elts.insert(Rec);
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223
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224 From += Step;
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225 }
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226 }
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227 };
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228
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229 // Expand a Def into a set by evaluating one of its fields.
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230 struct FieldExpander : public SetTheory::Expander {
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231 StringRef FieldName;
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232
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233 FieldExpander(StringRef fn) : FieldName(fn) {}
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234
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235 void expand(SetTheory &ST, Record *Def, RecSet &Elts) {
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236 ST.evaluate(Def->getValueInit(FieldName), Elts, Def->getLoc());
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237 }
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238 };
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239 } // end anonymous namespace
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240
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241 void SetTheory::Operator::anchor() { }
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242
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243 void SetTheory::Expander::anchor() { }
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244
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245 SetTheory::SetTheory() {
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246 addOperator("add", new AddOp);
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247 addOperator("sub", new SubOp);
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248 addOperator("and", new AndOp);
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249 addOperator("shl", new ShlOp);
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250 addOperator("trunc", new TruncOp);
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251 addOperator("rotl", new RotOp(false));
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252 addOperator("rotr", new RotOp(true));
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253 addOperator("decimate", new DecimateOp);
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254 addOperator("interleave", new InterleaveOp);
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255 addOperator("sequence", new SequenceOp);
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256 }
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257
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258 void SetTheory::addOperator(StringRef Name, Operator *Op) {
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259 Operators[Name] = Op;
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260 }
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261
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262 void SetTheory::addExpander(StringRef ClassName, Expander *E) {
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263 Expanders[ClassName] = E;
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264 }
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265
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266 void SetTheory::addFieldExpander(StringRef ClassName, StringRef FieldName) {
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267 addExpander(ClassName, new FieldExpander(FieldName));
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268 }
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269
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270 void SetTheory::evaluate(Init *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
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271 // A def in a list can be a just an element, or it may expand.
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272 if (DefInit *Def = dyn_cast<DefInit>(Expr)) {
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273 if (const RecVec *Result = expand(Def->getDef()))
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274 return Elts.insert(Result->begin(), Result->end());
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275 Elts.insert(Def->getDef());
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276 return;
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277 }
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278
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279 // Lists simply expand.
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280 if (ListInit *LI = dyn_cast<ListInit>(Expr))
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281 return evaluate(LI->begin(), LI->end(), Elts, Loc);
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282
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283 // Anything else must be a DAG.
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284 DagInit *DagExpr = dyn_cast<DagInit>(Expr);
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285 if (!DagExpr)
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286 PrintFatalError(Loc, "Invalid set element: " + Expr->getAsString());
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287 DefInit *OpInit = dyn_cast<DefInit>(DagExpr->getOperator());
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288 if (!OpInit)
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289 PrintFatalError(Loc, "Bad set expression: " + Expr->getAsString());
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290 Operator *Op = Operators.lookup(OpInit->getDef()->getName());
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291 if (!Op)
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292 PrintFatalError(Loc, "Unknown set operator: " + Expr->getAsString());
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293 Op->apply(*this, DagExpr, Elts, Loc);
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294 }
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295
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296 const RecVec *SetTheory::expand(Record *Set) {
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297 // Check existing entries for Set and return early.
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298 ExpandMap::iterator I = Expansions.find(Set);
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299 if (I != Expansions.end())
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300 return &I->second;
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301
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302 // This is the first time we see Set. Find a suitable expander.
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303 const std::vector<Record*> &SC = Set->getSuperClasses();
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304 for (unsigned i = 0, e = SC.size(); i != e; ++i) {
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305 // Skip unnamed superclasses.
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306 if (!dyn_cast<StringInit>(SC[i]->getNameInit()))
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307 continue;
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308 if (Expander *Exp = Expanders.lookup(SC[i]->getName())) {
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309 // This breaks recursive definitions.
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310 RecVec &EltVec = Expansions[Set];
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311 RecSet Elts;
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312 Exp->expand(*this, Set, Elts);
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313 EltVec.assign(Elts.begin(), Elts.end());
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314 return &EltVec;
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315 }
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316 }
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317
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318 // Set is not expandable.
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319 return 0;
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320 }
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321