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1 module dmd.MinExp;
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2
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3 import dmd.Expression;
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4 import dmd.TY;
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5 import dmd.ErrorExp;
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6 import dmd.Identifier;
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7 import dmd.IntegerExp;
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8 import dmd.DivExp;
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9 import dmd.Type;
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10 import dmd.InterState;
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11 import dmd.OutBuffer;
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12 import dmd.Loc;
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13 import dmd.Scope;
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14 import dmd.IRState;
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15 import dmd.ArrayTypes;
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16 import dmd.BinExp;
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17 import dmd.TOK;
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18 import dmd.Id;
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19 import dmd.expression.Min;
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20
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21 import dmd.backend.elem;
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22 import dmd.backend.Util;
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23 import dmd.backend.OPER;
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24
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25 class MinExp : BinExp
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26 {
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27 this(Loc loc, Expression e1, Expression e2)
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28 {
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29 super(loc, TOK.TOKmin, MinExp.sizeof, e1, e2);
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30 }
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31
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32 Expression semantic(Scope sc)
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33 {
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34 Expression e;
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35 Type t1;
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36 Type t2;
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37
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38 version (LOGSEMANTIC) {
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39 printf("MinExp.semantic('%s')\n", toChars());
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40 }
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41 if (type)
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42 return this;
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43
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44 super.semanticp(sc);
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45
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46 e = op_overload(sc);
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47 if (e)
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48 return e;
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49
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50 e = this;
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51 t1 = e1.type.toBasetype();
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52 t2 = e2.type.toBasetype();
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53 if (t1.ty == TY.Tpointer)
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54 {
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55 if (t2.ty == TY.Tpointer)
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56 { // Need to divide the result by the stride
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57 // Replace (ptr - ptr) with (ptr - ptr) / stride
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58 long stride;
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59 Expression ee;
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60
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61 typeCombine(sc); // make sure pointer types are compatible
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62 type = Type.tptrdiff_t;
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63 stride = t2.nextOf().size();
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64 if (stride == 0)
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65 {
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66 ee = new IntegerExp(loc, 0, Type.tptrdiff_t);
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67 }
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68 else
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69 {
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70 ee = new DivExp(loc, this, new IntegerExp(Loc(0), stride, Type.tptrdiff_t));
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71 ee.type = Type.tptrdiff_t;
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72 }
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73 return ee;
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74 }
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75 else if (t2.isintegral())
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76 e = scaleFactor(sc);
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77 else
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78 {
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79 error("incompatible types for minus");
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80 return new ErrorExp();
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81 }
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82 }
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83 else if (t2.ty == TY.Tpointer)
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84 {
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85 type = e2.type;
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86 error("can't subtract pointer from %s", e1.type.toChars());
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87 return new ErrorExp();
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88 }
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89 else
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90 {
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91 typeCombine(sc);
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92 t1 = e1.type.toBasetype();
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93 t2 = e2.type.toBasetype();
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94 if ((t1.isreal() && t2.isimaginary()) ||
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95 (t1.isimaginary() && t2.isreal()))
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96 {
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97 switch (type.ty)
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98 {
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99 case TY.Tfloat32:
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100 case TY.Timaginary32:
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101 type = Type.tcomplex32;
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102 break;
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103
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104 case TY.Tfloat64:
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105 case TY.Timaginary64:
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106 type = Type.tcomplex64;
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107 break;
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108
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109 case TY.Tfloat80:
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110 case TY.Timaginary80:
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111 type = Type.tcomplex80;
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112 break;
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113
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114 default:
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115 assert(0);
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116 }
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117 }
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118 }
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119 return e;
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120 }
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121
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122 Expression optimize(int result)
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123 {
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124 Expression e;
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125
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126 e1 = e1.optimize(result);
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127 e2 = e2.optimize(result);
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128 if (e1.isConst() && e2.isConst())
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129 {
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130 if (e2.op == TOK.TOKsymoff)
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131 return this;
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132 e = Min(type, e1, e2);
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133 }
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134 else
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135 e = this;
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136
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137 return e;
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138 }
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139
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140 Expression interpret(InterState* istate)
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141 {
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142 assert(false);
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143 }
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144
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145 void buildArrayIdent(OutBuffer buf, Expressions arguments)
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146 {
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147 assert(false);
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148 }
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149
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150 Expression buildArrayLoop(Arguments fparams)
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151 {
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152 assert(false);
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153 }
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154
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155 Identifier opId()
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156 {
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157 return Id.sub;
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158 }
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159
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160 Identifier opId_r()
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161 {
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162 return Id.sub_r;
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163 }
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164
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165 elem* toElem(IRState* irs)
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166 {
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167 Type tb1 = e1.type.toBasetype();
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168 Type tb2 = e2.type.toBasetype();
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169
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170 if ((tb1.ty == TY.Tarray || tb1.ty == TY.Tsarray) && (tb2.ty == TY.Tarray || tb2.ty == TY.Tsarray))
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171 {
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172 error("Array operation %s not implemented", toChars());
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173 return el_long(type.totym(), 0); // error recovery
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174 }
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175
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176 return toElemBin(irs, OPER.OPmin);
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177 }
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178 }
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179
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