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annotate gen/abi.cpp @ 1018:e8c6dbcd33d1

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- Fixed x86-32 C ABI for complex number return values. - Removed unused code from the ABI class.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Sun, 01 Mar 2009 19:01:05 +0100
parents c749648ed2b8
children 9167d492cbc2
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989
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1 #include "gen/llvm.h"
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2
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3 #include "mars.h"
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4
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5 #include "gen/irstate.h"
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6 #include "gen/llvmhelpers.h"
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7 #include "gen/tollvm.h"
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8 #include "gen/abi.h"
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9 #include "gen/logger.h"
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10
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11 //////////////////////////////////////////////////////////////////////////////
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12 //////////////////////////////////////////////////////////////////////////////
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13 ///////////////////// baseclass ////////////////////////////
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14 //////////////////////////////////////////////////////////////////////////////
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15 //////////////////////////////////////////////////////////////////////////////
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16
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17 // FIXME: Would be nice to come up a better and faster way to do this, right
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18 // now I'm more worried about actually making this abstraction work at all ...
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19 // It's definitely way overkill with the amount of return value rewrites we
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20 // have right now, but I expect this to change with proper x86-64 abi support
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21
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22 TargetABI::TargetABI()
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23 {
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24 }
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25
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26 llvm::Value* TargetABI::getRet(TypeFunction* tf, llvm::Value* io)
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27 {
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28 if (ABIRetRewrite* r = findRetRewrite(tf))
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29 {
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30 return r->get(io);
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31 }
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32 return io;
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33 }
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34
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35 llvm::Value* TargetABI::putRet(TypeFunction* tf, llvm::Value* io)
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36 {
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37 if (ABIRetRewrite* r = findRetRewrite(tf))
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38 {
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39 return r->put(io);
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40 }
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41 return io;
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42 }
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43
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44 const llvm::Type* TargetABI::getRetType(TypeFunction* tf, const llvm::Type* t)
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45 {
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46 if (ABIRetRewrite* r = findRetRewrite(tf))
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47 {
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48 return r->type(t);
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49 }
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50 return t;
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51 }
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52
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53 ABIRetRewrite * TargetABI::findRetRewrite(TypeFunction * tf)
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54 {
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55 size_t n = retOps.size();
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56 if (n)
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57 for (size_t i = 0; i < n; i++)
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58 {
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59 if (retOps[i]->test(tf))
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60 return retOps[i];
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61 }
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62 return NULL;
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63 }
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64
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65 //////////////////////////////////////////////////////////////////////////////
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66 //////////////////////////////////////////////////////////////////////////////
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67 ///////////////////// X86 ////////////////////////////
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68 //////////////////////////////////////////////////////////////////////////////
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69 //////////////////////////////////////////////////////////////////////////////
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70
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71 // simply swap of real/imag parts for proper x87 complex abi
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72 struct X87_complex_swap : ABIRetRewrite
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73 {
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74 LLValue* get(LLValue* v)
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75 {
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76 return DtoAggrPairSwap(v);
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77 }
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78 LLValue* put(LLValue* v)
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79 {
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80 return DtoAggrPairSwap(v);
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81 }
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82 const LLType* type(const LLType* t)
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83 {
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84 return t;
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85 }
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86 bool test(TypeFunction* tf)
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87 {
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88 // extern(D) && is(T:creal)
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89 return (tf->linkage == LINKd && tf->next->toBasetype()->iscomplex());
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90 }
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91 };
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92
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93 //////////////////////////////////////////////////////////////////////////////
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94
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95 struct X86_cfloat_rewrite : ABIRetRewrite
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96 {
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97 // i64 -> {float,float}
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98 LLValue* get(LLValue* in)
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99 {
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100 // extract real part
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101 LLValue* rpart = gIR->ir->CreateTrunc(in, LLType::Int32Ty);
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102 rpart = gIR->ir->CreateBitCast(rpart, LLType::FloatTy, ".re");
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103
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104 // extract imag part
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105 LLValue* ipart = gIR->ir->CreateLShr(in, LLConstantInt::get(LLType::Int64Ty, 32, false));
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106 ipart = gIR->ir->CreateTrunc(ipart, LLType::Int32Ty);
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107 ipart = gIR->ir->CreateBitCast(ipart, LLType::FloatTy, ".im");
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108
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109 // return {float,float} aggr pair with same bits
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110 return DtoAggrPair(rpart, ipart, ".final_cfloat");
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111 }
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112
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113 // {float,float} -> i64
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114 LLValue* put(LLValue* v)
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115 {
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116 // extract real
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117 LLValue* r = gIR->ir->CreateExtractValue(v, 0);
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118 // cast to i32
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119 r = gIR->ir->CreateBitCast(r, LLType::Int32Ty);
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120 // zext to i64
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121 r = gIR->ir->CreateZExt(r, LLType::Int64Ty);
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122
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123 // extract imag
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124 LLValue* i = gIR->ir->CreateExtractValue(v, 1);
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125 // cast to i32
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126 i = gIR->ir->CreateBitCast(i, LLType::Int32Ty);
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127 // zext to i64
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128 i = gIR->ir->CreateZExt(i, LLType::Int64Ty);
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129 // shift up
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130 i = gIR->ir->CreateShl(i, LLConstantInt::get(LLType::Int64Ty, 32, false));
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131
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132 // combine and return
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133 return v = gIR->ir->CreateOr(r, i);
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134 }
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135
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136 // {float,float} -> i64
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137 const LLType* type(const LLType* t)
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138 {
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139 return LLType::Int64Ty;
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140 }
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141
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142 // test if rewrite applies to function
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143 bool test(TypeFunction* tf)
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144 {
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145 return (tf->linkage != LINKd)
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146 && (tf->next->toBasetype() == Type::tcomplex32);
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147 }
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148 };
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149
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150 //////////////////////////////////////////////////////////////////////////////
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151
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152 struct X86TargetABI : TargetABI
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153 {
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154 X86TargetABI()
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155 {
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156 retOps.push_back(new X87_complex_swap);
1018
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157 retOps.push_back(new X86_cfloat_rewrite);
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158 }
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159
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160 bool returnInArg(TypeFunction* tf)
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161 {
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162 Type* rt = tf->next->toBasetype();
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163 // D only returns structs on the stack
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164 if (tf->linkage == LINKd)
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165 return (rt->ty == Tstruct);
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166 // other ABI's follow C, which is cdouble and creal returned on the stack
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167 // as well as structs
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168 else
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169 return (rt->ty == Tstruct || rt->ty == Tcomplex64 || rt->ty == Tcomplex80);
989
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170 }
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171 };
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172
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173 //////////////////////////////////////////////////////////////////////////////
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174 //////////////////////////////////////////////////////////////////////////////
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175 /////////////////// X86-64 //////////////////////////
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176 //////////////////////////////////////////////////////////////////////////////
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177 //////////////////////////////////////////////////////////////////////////////
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178
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179 struct X86_64_cfloat_rewrite : ABIRetRewrite
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180 {
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181 // {double} -> {float,float}
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182 LLValue* get(LLValue* in)
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183 {
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184 // extract double
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185 LLValue* v = gIR->ir->CreateExtractValue(in, 0);
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186 // cast to i64
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187 v = gIR->ir->CreateBitCast(v, LLType::Int64Ty);
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188
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189 // extract real part
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190 LLValue* rpart = gIR->ir->CreateTrunc(v, LLType::Int32Ty);
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191 rpart = gIR->ir->CreateBitCast(rpart, LLType::FloatTy, ".re");
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192
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193 // extract imag part
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194 LLValue* ipart = gIR->ir->CreateLShr(v, LLConstantInt::get(LLType::Int64Ty, 32, false));
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195 ipart = gIR->ir->CreateTrunc(ipart, LLType::Int32Ty);
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196 ipart = gIR->ir->CreateBitCast(ipart, LLType::FloatTy, ".im");
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197
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198 // return {float,float} aggr pair with same bits
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199 return DtoAggrPair(rpart, ipart, ".final_cfloat");
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200 }
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201
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202 // {float,float} -> {double}
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203 LLValue* put(LLValue* v)
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204 {
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205 // extract real
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206 LLValue* r = gIR->ir->CreateExtractValue(v, 0);
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207 // cast to i32
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208 r = gIR->ir->CreateBitCast(r, LLType::Int32Ty);
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209 // zext to i64
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210 r = gIR->ir->CreateZExt(r, LLType::Int64Ty);
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211
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212 // extract imag
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213 LLValue* i = gIR->ir->CreateExtractValue(v, 1);
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214 // cast to i32
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215 i = gIR->ir->CreateBitCast(i, LLType::Int32Ty);
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216 // zext to i64
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217 i = gIR->ir->CreateZExt(i, LLType::Int64Ty);
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218 // shift up
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219 i = gIR->ir->CreateShl(i, LLConstantInt::get(LLType::Int64Ty, 32, false));
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220
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221 // combine
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222 v = gIR->ir->CreateOr(r, i);
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223
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224 // cast to double
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225 v = gIR->ir->CreateBitCast(v, LLType::DoubleTy);
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226
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227 // return {double}
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228 const LLType* t = LLStructType::get(LLType::DoubleTy, NULL);
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229 LLValue* undef = llvm::UndefValue::get(t);
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230 return gIR->ir->CreateInsertValue(undef, v, 0);
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231 }
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232
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233 // {float,float} -> {double}
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234 const LLType* type(const LLType* t)
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235 {
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236 return LLStructType::get(LLType::DoubleTy, NULL);
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237 }
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238
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239 // test if rewrite applies to function
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240 bool test(TypeFunction* tf)
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241 {
1002
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242 return (tf->linkage != LINKd)
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243 && (tf->next->toBasetype() == Type::tcomplex32);
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244 }
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245 };
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246
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247 //////////////////////////////////////////////////////////////////////////////
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248
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249 struct X86_64TargetABI : TargetABI
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250 {
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251 X86_64TargetABI()
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252 {
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253 retOps.push_back(new X86_64_cfloat_rewrite);
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254 }
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255
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256 bool returnInArg(TypeFunction* tf)
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257 {
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258 Type* rt = tf->next->toBasetype();
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259 return (rt->ty == Tstruct);
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260 }
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261 };
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262
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263 //////////////////////////////////////////////////////////////////////////////
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264 //////////////////////////////////////////////////////////////////////////////
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265 /////////////////// Unknown targets //////////////////////////
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266 //////////////////////////////////////////////////////////////////////////////
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267 //////////////////////////////////////////////////////////////////////////////
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268
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269 // Some reasonable defaults for when we don't know what ABI to use.
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270 struct UnknownTargetABI : TargetABI
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271 {
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272 UnknownTargetABI()
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273 {
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274 // Don't push anything into retOps, assume defaults will be fine.
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275 }
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276
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277 bool returnInArg(TypeFunction* tf)
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278 {
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279 Type* rt = tf->next->toBasetype();
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280 return (rt->ty == Tstruct);
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281 }
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282 };
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283
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284 //////////////////////////////////////////////////////////////////////////////
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285 //////////////////////////////////////////////////////////////////////////////
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286 //////////////////////////////////////////////////////////////////////////////
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287 //////////////////////////////////////////////////////////////////////////////
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288 //////////////////////////////////////////////////////////////////////////////
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289
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290 TargetABI * TargetABI::getTarget()
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291 {
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292 switch(global.params.cpu)
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293 {
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294 case ARCHx86:
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295 return new X86TargetABI;
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296 case ARCHx86_64:
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297 return new X86_64TargetABI;
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298 default:
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299 Logger::cout() << "WARNING: Unknown ABI, guessing...\n";
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300 return new UnknownTargetABI;
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301 }
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302 }