clang/lib/CodeGen/CGExprComplex.cpp

   1 //===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This contains code to emit Expr nodes with complex types as LLVM code.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "CGOpenMPRuntime.h"
  14 #include "CodeGenFunction.h"
  15 #include "CodeGenModule.h"
  16 #include "ConstantEmitter.h"
  17 #include "clang/AST/StmtVisitor.h"
  18 #include "llvm/ADT/STLExtras.h"
  19 #include "llvm/IR/Constants.h"
  20 #include "llvm/IR/Instructions.h"
  21 #include "llvm/IR/MDBuilder.h"
  22 #include "llvm/IR/Metadata.h"
  23 #include <algorithm>
  24 using namespace clang;
  25 using namespace CodeGen;
  26
  27 //===----------------------------------------------------------------------===//
  28 //                        Complex Expression Emitter
  29 //===----------------------------------------------------------------------===//
  30
  31 typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
  32
  33 /// Return the complex type that we are meant to emit.
  34 static const ComplexType *getComplexType(QualType type) {
  35   type = type.getCanonicalType();
  36   if (const ComplexType *comp = dyn_cast<ComplexType>(type)) {
  37     return comp;
  38   } else {
  39     return cast<ComplexType>(cast<AtomicType>(type)->getValueType());
  40   }
  41 }
  42
  43 namespace  {
  44 class ComplexExprEmitter
  45   : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
  46   CodeGenFunction &CGF;
  47   CGBuilderTy &Builder;
  48   bool IgnoreReal;
  49   bool IgnoreImag;
  50 public:
  51   ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
  52     : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
  53   }
  54
  55
  56   //===--------------------------------------------------------------------===//
  57   //                               Utilities
  58   //===--------------------------------------------------------------------===//
  59
  60   bool TestAndClearIgnoreReal() {
  61     bool I = IgnoreReal;
  62     IgnoreReal = false;
  63     return I;
  64   }
  65   bool TestAndClearIgnoreImag() {
  66     bool I = IgnoreImag;
  67     IgnoreImag = false;
  68     return I;
  69   }
  70
  71   /// EmitLoadOfLValue - Given an expression with complex type that represents a
  72   /// value l-value, this method emits the address of the l-value, then loads
  73   /// and returns the result.
  74   ComplexPairTy EmitLoadOfLValue(const Expr *E) {
  75     return EmitLoadOfLValue(CGF.EmitLValue(E), E->getExprLoc());
  76   }
  77
  78   ComplexPairTy EmitLoadOfLValue(LValue LV, SourceLocation Loc);
  79
  80   /// EmitStoreOfComplex - Store the specified real/imag parts into the
  81   /// specified value pointer.
  82   void EmitStoreOfComplex(ComplexPairTy Val, LValue LV, bool isInit);
  83
  84   /// Emit a cast from complex value Val to DestType.
  85   ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
  86                                          QualType DestType, SourceLocation Loc);
  87   /// Emit a cast from scalar value Val to DestType.
  88   ComplexPairTy EmitScalarToComplexCast(llvm::Value *Val, QualType SrcType,
  89                                         QualType DestType, SourceLocation Loc);
  90
  91   //===--------------------------------------------------------------------===//
  92   //                            Visitor Methods
  93   //===--------------------------------------------------------------------===//
  94
  95   ComplexPairTy Visit(Expr *E) {
  96     ApplyDebugLocation DL(CGF, E);
  97     return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
  98   }
  99
 100   ComplexPairTy VisitStmt(Stmt *S) {
 101     S->dump(llvm::errs(), CGF.getContext());
 102     llvm_unreachable("Stmt can't have complex result type!");
 103   }
 104   ComplexPairTy VisitExpr(Expr *S);
 105   ComplexPairTy VisitConstantExpr(ConstantExpr *E) {
 106     if (llvm::Constant *Result = ConstantEmitter(CGF).tryEmitConstantExpr(E))
 107       return ComplexPairTy(Result->getAggregateElement(0U),
 108                            Result->getAggregateElement(1U));
 109     return Visit(E->getSubExpr());
 110   }
 111   ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
 112   ComplexPairTy VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
 113     return Visit(GE->getResultExpr());
 114   }
 115   ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
 116   ComplexPairTy
 117   VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) {
 118     return Visit(PE->getReplacement());
 119   }
 120   ComplexPairTy VisitCoawaitExpr(CoawaitExpr *S) {
 121     return CGF.EmitCoawaitExpr(*S).getComplexVal();
 122   }
 123   ComplexPairTy VisitCoyieldExpr(CoyieldExpr *S) {
 124     return CGF.EmitCoyieldExpr(*S).getComplexVal();
 125   }
 126   ComplexPairTy VisitUnaryCoawait(const UnaryOperator *E) {
 127     return Visit(E->getSubExpr());
 128   }
 129
 130   ComplexPairTy emitConstant(const CodeGenFunction::ConstantEmission &Constant,
 131                              Expr *E) {
 132     assert(Constant && "not a constant");
 133     if (Constant.isReference())
 134       return EmitLoadOfLValue(Constant.getReferenceLValue(CGF, E),
 135                               E->getExprLoc());
 136
 137     llvm::Constant *pair = Constant.getValue();
 138     return ComplexPairTy(pair->getAggregateElement(0U),
 139                          pair->getAggregateElement(1U));
 140   }
 141
 142   // l-values.
 143   ComplexPairTy VisitDeclRefExpr(DeclRefExpr *E) {
 144     if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E))
 145       return emitConstant(Constant, E);
 146     return EmitLoadOfLValue(E);
 147   }
 148   ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
 149     return EmitLoadOfLValue(E);
 150   }
 151   ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
 152     return CGF.EmitObjCMessageExpr(E).getComplexVal();
 153   }
 154   ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
 155   ComplexPairTy VisitMemberExpr(MemberExpr *ME) {
 156     if (CodeGenFunction::ConstantEmission Constant =
 157             CGF.tryEmitAsConstant(ME)) {
 158       CGF.EmitIgnoredExpr(ME->getBase());
 159       return emitConstant(Constant, ME);
 160     }
 161     return EmitLoadOfLValue(ME);
 162   }
 163   ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
 164     if (E->isGLValue())
 165       return EmitLoadOfLValue(CGF.getOrCreateOpaqueLValueMapping(E),
 166                               E->getExprLoc());
 167     return CGF.getOrCreateOpaqueRValueMapping(E).getComplexVal();
 168   }
 169
 170   ComplexPairTy VisitPseudoObjectExpr(PseudoObjectExpr *E) {
 171     return CGF.EmitPseudoObjectRValue(E).getComplexVal();
 172   }
 173
 174   // FIXME: CompoundLiteralExpr
 175
 176   ComplexPairTy EmitCast(CastKind CK, Expr *Op, QualType DestTy);
 177   ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
 178     // Unlike for scalars, we don't have to worry about function->ptr demotion
 179     // here.
 180     if (E->changesVolatileQualification())
 181       return EmitLoadOfLValue(E);
 182     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
 183   }
 184   ComplexPairTy VisitCastExpr(CastExpr *E) {
 185     if (const auto *ECE = dyn_cast<ExplicitCastExpr>(E))
 186       CGF.CGM.EmitExplicitCastExprType(ECE, &CGF);
 187     if (E->changesVolatileQualification())
 188        return EmitLoadOfLValue(E);
 189     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
 190   }
 191   ComplexPairTy VisitCallExpr(const CallExpr *E);
 192   ComplexPairTy VisitStmtExpr(const StmtExpr *E);
 193
 194   // Operators.
 195   ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
 196                                    bool isInc, bool isPre) {
 197     LValue LV = CGF.EmitLValue(E->getSubExpr());
 198     return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
 199   }
 200   ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
 201     return VisitPrePostIncDec(E, false, false);
 202   }
 203   ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
 204     return VisitPrePostIncDec(E, true, false);
 205   }
 206   ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
 207     return VisitPrePostIncDec(E, false, true);
 208   }
 209   ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
 210     return VisitPrePostIncDec(E, true, true);
 211   }
 212   ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
 213
 214   ComplexPairTy VisitUnaryPlus(const UnaryOperator *E,
 215                                QualType PromotionType = QualType());
 216   ComplexPairTy VisitPlus(const UnaryOperator *E, QualType PromotionType);
 217   ComplexPairTy VisitUnaryMinus(const UnaryOperator *E,
 218                                 QualType PromotionType = QualType());
 219   ComplexPairTy VisitMinus(const UnaryOperator *E, QualType PromotionType);
 220   ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
 221   // LNot,Real,Imag never return complex.
 222   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
 223     return Visit(E->getSubExpr());
 224   }
 225   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
 226     CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE);
 227     return Visit(DAE->getExpr());
 228   }
 229   ComplexPairTy VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
 230     CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE);
 231     return Visit(DIE->getExpr());
 232   }
 233   ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
 234     CodeGenFunction::RunCleanupsScope Scope(CGF);
 235     ComplexPairTy Vals = Visit(E->getSubExpr());
 236     // Defend against dominance problems caused by jumps out of expression
 237     // evaluation through the shared cleanup block.
 238     Scope.ForceCleanup({&Vals.first, &Vals.second});
 239     return Vals;
 240   }
 241   ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
 242     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
 243     QualType Elem = E->getType()->castAs<ComplexType>()->getElementType();
 244     llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
 245     return ComplexPairTy(Null, Null);
 246   }
 247   ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
 248     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
 249     QualType Elem = E->getType()->castAs<ComplexType>()->getElementType();
 250     llvm::Constant *Null =
 251                        llvm::Constant::getNullValue(CGF.ConvertType(Elem));
 252     return ComplexPairTy(Null, Null);
 253   }
 254
 255   struct BinOpInfo {
 256     ComplexPairTy LHS;
 257     ComplexPairTy RHS;
 258     QualType Ty;  // Computation Type.
 259     FPOptions FPFeatures;
 260   };
 261
 262   BinOpInfo EmitBinOps(const BinaryOperator *E,
 263                        QualType PromotionTy = QualType());
 264   ComplexPairTy EmitPromoted(const Expr *E, QualType PromotionTy);
 265   ComplexPairTy EmitPromotedComplexOperand(const Expr *E, QualType PromotionTy);
 266   LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
 267                                   ComplexPairTy (ComplexExprEmitter::*Func)
 268                                   (const BinOpInfo &),
 269                                   RValue &Val);
 270   ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
 271                                    ComplexPairTy (ComplexExprEmitter::*Func)
 272                                    (const BinOpInfo &));
 273
 274   ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
 275   ComplexPairTy EmitBinSub(const BinOpInfo &Op);
 276   ComplexPairTy EmitBinMul(const BinOpInfo &Op);
 277   ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
 278
 279   ComplexPairTy EmitComplexBinOpLibCall(StringRef LibCallName,
 280                                         const BinOpInfo &Op);
 281
 282   QualType getPromotionType(QualType Ty) {
 283     if (auto *CT = Ty->getAs<ComplexType>()) {
 284       QualType ElementType = CT->getElementType();
 285       if (ElementType.UseExcessPrecision(CGF.getContext()))
 286         return CGF.getContext().getComplexType(CGF.getContext().FloatTy);
 287     }
 288     if (Ty.UseExcessPrecision(CGF.getContext()))
 289       return CGF.getContext().FloatTy;
 290     return QualType();
 291   }
 292
 293 #define HANDLEBINOP(OP)                                                        \
 294   ComplexPairTy VisitBin##OP(const BinaryOperator *E) {                        \
 295     QualType promotionTy = getPromotionType(E->getType());                     \
 296     ComplexPairTy result = EmitBin##OP(EmitBinOps(E, promotionTy));            \
 297     if (!promotionTy.isNull())                                                 \
 298       result =                                                                 \
 299           CGF.EmitUnPromotedValue(result, E->getType());                       \
 300     return result;                                                             \
 301   }
 302
 303   HANDLEBINOP(Mul)
 304   HANDLEBINOP(Div)
 305   HANDLEBINOP(Add)
 306   HANDLEBINOP(Sub)
 307 #undef HANDLEBINOP
 308
 309   ComplexPairTy VisitCXXRewrittenBinaryOperator(CXXRewrittenBinaryOperator *E) {
 310     return Visit(E->getSemanticForm());
 311   }
 312
 313   // Compound assignments.
 314   ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
 315     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
 316   }
 317   ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
 318     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
 319   }
 320   ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
 321     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
 322   }
 323   ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
 324     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
 325   }
 326
 327   // GCC rejects rem/and/or/xor for integer complex.
 328   // Logical and/or always return int, never complex.
 329
 330   // No comparisons produce a complex result.
 331
 332   LValue EmitBinAssignLValue(const BinaryOperator *E,
 333                              ComplexPairTy &Val);
 334   ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
 335   ComplexPairTy VisitBinComma      (const BinaryOperator *E);
 336
 337
 338   ComplexPairTy
 339   VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
 340   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
 341
 342   ComplexPairTy VisitInitListExpr(InitListExpr *E);
 343
 344   ComplexPairTy VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
 345     return EmitLoadOfLValue(E);
 346   }
 347
 348   ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
 349
 350   ComplexPairTy VisitAtomicExpr(AtomicExpr *E) {
 351     return CGF.EmitAtomicExpr(E).getComplexVal();
 352   }
 353 };
 354 }  // end anonymous namespace.
 355
 356 //===----------------------------------------------------------------------===//
 357 //                                Utilities
 358 //===----------------------------------------------------------------------===//
 359
 360 Address CodeGenFunction::emitAddrOfRealComponent(Address addr,
 361                                                  QualType complexType) {
 362   return Builder.CreateStructGEP(addr, 0, addr.getName() + ".realp");
 363 }
 364
 365 Address CodeGenFunction::emitAddrOfImagComponent(Address addr,
 366                                                  QualType complexType) {
 367   return Builder.CreateStructGEP(addr, 1, addr.getName() + ".imagp");
 368 }
 369
 370 /// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
 371 /// load the real and imaginary pieces, returning them as Real/Imag.
 372 ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue,
 373                                                    SourceLocation loc) {
 374   assert(lvalue.isSimple() && "non-simple complex l-value?");
 375   if (lvalue.getType()->isAtomicType())
 376     return CGF.EmitAtomicLoad(lvalue, loc).getComplexVal();
 377
 378   Address SrcPtr = lvalue.getAddress(CGF);
 379   bool isVolatile = lvalue.isVolatileQualified();
 380
 381   llvm::Value *Real = nullptr, *Imag = nullptr;
 382
 383   if (!IgnoreReal || isVolatile) {
 384     Address RealP = CGF.emitAddrOfRealComponent(SrcPtr, lvalue.getType());
 385     Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr.getName() + ".real");
 386   }
 387
 388   if (!IgnoreImag || isVolatile) {
 389     Address ImagP = CGF.emitAddrOfImagComponent(SrcPtr, lvalue.getType());
 390     Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr.getName() + ".imag");
 391   }
 392
 393   return ComplexPairTy(Real, Imag);
 394 }
 395
 396 /// EmitStoreOfComplex - Store the specified real/imag parts into the
 397 /// specified value pointer.
 398 void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
 399                                             bool isInit) {
 400   if (lvalue.getType()->isAtomicType() ||
 401       (!isInit && CGF.LValueIsSuitableForInlineAtomic(lvalue)))
 402     return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);
 403
 404   Address Ptr = lvalue.getAddress(CGF);
 405   Address RealPtr = CGF.emitAddrOfRealComponent(Ptr, lvalue.getType());
 406   Address ImagPtr = CGF.emitAddrOfImagComponent(Ptr, lvalue.getType());
 407
 408   Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
 409   Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
 410 }
 411
 412
 413
 414 //===----------------------------------------------------------------------===//
 415 //                            Visitor Methods
 416 //===----------------------------------------------------------------------===//
 417
 418 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
 419   CGF.ErrorUnsupported(E, "complex expression");
 420   llvm::Type *EltTy =
 421     CGF.ConvertType(getComplexType(E->getType())->getElementType());
 422   llvm::Value *U = llvm::UndefValue::get(EltTy);
 423   return ComplexPairTy(U, U);
 424 }
 425
 426 ComplexPairTy ComplexExprEmitter::
 427 VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
 428   llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
 429   return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
 430 }
 431
 432
 433 ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
 434   if (E->getCallReturnType(CGF.getContext())->isReferenceType())
 435     return EmitLoadOfLValue(E);
 436
 437   return CGF.EmitCallExpr(E).getComplexVal();
 438 }
 439
 440 ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
 441   CodeGenFunction::StmtExprEvaluation eval(CGF);
 442   Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(), true);
 443   assert(RetAlloca.isValid() && "Expected complex return value");
 444   return EmitLoadOfLValue(CGF.MakeAddrLValue(RetAlloca, E->getType()),
 445                           E->getExprLoc());
 446 }
 447
 448 /// Emit a cast from complex value Val to DestType.
 449 ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
 450                                                            QualType SrcType,
 451                                                            QualType DestType,
 452                                                            SourceLocation Loc) {
 453   // Get the src/dest element type.
 454   SrcType = SrcType->castAs<ComplexType>()->getElementType();
 455   DestType = DestType->castAs<ComplexType>()->getElementType();
 456
 457   // C99 6.3.1.6: When a value of complex type is converted to another
 458   // complex type, both the real and imaginary parts follow the conversion
 459   // rules for the corresponding real types.
 460   if (Val.first)
 461     Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType, Loc);
 462   if (Val.second)
 463     Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType, Loc);
 464   return Val;
 465 }
 466
 467 ComplexPairTy ComplexExprEmitter::EmitScalarToComplexCast(llvm::Value *Val,
 468                                                           QualType SrcType,
 469                                                           QualType DestType,
 470                                                           SourceLocation Loc) {
 471   // Convert the input element to the element type of the complex.
 472   DestType = DestType->castAs<ComplexType>()->getElementType();
 473   Val = CGF.EmitScalarConversion(Val, SrcType, DestType, Loc);
 474
 475   // Return (realval, 0).
 476   return ComplexPairTy(Val, llvm::Constant::getNullValue(Val->getType()));
 477 }
 478
 479 ComplexPairTy ComplexExprEmitter::EmitCast(CastKind CK, Expr *Op,
 480                                            QualType DestTy) {
 481   switch (CK) {
 482   case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
 483
 484   // Atomic to non-atomic casts may be more than a no-op for some platforms and
 485   // for some types.
 486   case CK_AtomicToNonAtomic:
 487   case CK_NonAtomicToAtomic:
 488   case CK_NoOp:
 489   case CK_LValueToRValue:
 490   case CK_UserDefinedConversion:
 491     return Visit(Op);
 492
 493   case CK_LValueBitCast: {
 494     LValue origLV = CGF.EmitLValue(Op);
 495     Address V = origLV.getAddress(CGF).withElementType(CGF.ConvertType(DestTy));
 496     return EmitLoadOfLValue(CGF.MakeAddrLValue(V, DestTy), Op->getExprLoc());
 497   }
 498
 499   case CK_LValueToRValueBitCast: {
 500     LValue SourceLVal = CGF.EmitLValue(Op);
 501     Address Addr = SourceLVal.getAddress(CGF).withElementType(
 502         CGF.ConvertTypeForMem(DestTy));
 503     LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
 504     DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
 505     return EmitLoadOfLValue(DestLV, Op->getExprLoc());
 506   }
 507
 508   case CK_BitCast:
 509   case CK_BaseToDerived:
 510   case CK_DerivedToBase:
 511   case CK_UncheckedDerivedToBase:
 512   case CK_Dynamic:
 513   case CK_ToUnion:
 514   case CK_ArrayToPointerDecay:
 515   case CK_FunctionToPointerDecay:
 516   case CK_NullToPointer:
 517   case CK_NullToMemberPointer:
 518   case CK_BaseToDerivedMemberPointer:
 519   case CK_DerivedToBaseMemberPointer:
 520   case CK_MemberPointerToBoolean:
 521   case CK_ReinterpretMemberPointer:
 522   case CK_ConstructorConversion:
 523   case CK_IntegralToPointer:
 524   case CK_PointerToIntegral:
 525   case CK_PointerToBoolean:
 526   case CK_ToVoid:
 527   case CK_VectorSplat:
 528   case CK_IntegralCast:
 529   case CK_BooleanToSignedIntegral:
 530   case CK_IntegralToBoolean:
 531   case CK_IntegralToFloating:
 532   case CK_FloatingToIntegral:
 533   case CK_FloatingToBoolean:
 534   case CK_FloatingCast:
 535   case CK_CPointerToObjCPointerCast:
 536   case CK_BlockPointerToObjCPointerCast:
 537   case CK_AnyPointerToBlockPointerCast:
 538   case CK_ObjCObjectLValueCast:
 539   case CK_FloatingComplexToReal:
 540   case CK_FloatingComplexToBoolean:
 541   case CK_IntegralComplexToReal:
 542   case CK_IntegralComplexToBoolean:
 543   case CK_ARCProduceObject:
 544   case CK_ARCConsumeObject:
 545   case CK_ARCReclaimReturnedObject:
 546   case CK_ARCExtendBlockObject:
 547   case CK_CopyAndAutoreleaseBlockObject:
 548   case CK_BuiltinFnToFnPtr:
 549   case CK_ZeroToOCLOpaqueType:
 550   case CK_AddressSpaceConversion:
 551   case CK_IntToOCLSampler:
 552   case CK_FloatingToFixedPoint:
 553   case CK_FixedPointToFloating:
 554   case CK_FixedPointCast:
 555   case CK_FixedPointToBoolean:
 556   case CK_FixedPointToIntegral:
 557   case CK_IntegralToFixedPoint:
 558   case CK_MatrixCast:
 559     llvm_unreachable("invalid cast kind for complex value");
 560
 561   case CK_FloatingRealToComplex:
 562   case CK_IntegralRealToComplex: {
 563     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op);
 564     return EmitScalarToComplexCast(CGF.EmitScalarExpr(Op), Op->getType(),
 565                                    DestTy, Op->getExprLoc());
 566   }
 567
 568   case CK_FloatingComplexCast:
 569   case CK_FloatingComplexToIntegralComplex:
 570   case CK_IntegralComplexCast:
 571   case CK_IntegralComplexToFloatingComplex: {
 572     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op);
 573     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy,
 574                                     Op->getExprLoc());
 575   }
 576   }
 577
 578   llvm_unreachable("unknown cast resulting in complex value");
 579 }
 580
 581 ComplexPairTy ComplexExprEmitter::VisitUnaryPlus(const UnaryOperator *E,
 582                                                  QualType PromotionType) {
 583   QualType promotionTy = PromotionType.isNull()
 584                              ? getPromotionType(E->getSubExpr()->getType())
 585                              : PromotionType;
 586   ComplexPairTy result = VisitPlus(E, promotionTy);
 587   if (!promotionTy.isNull())
 588     return CGF.EmitUnPromotedValue(result, E->getSubExpr()->getType());
 589   return result;
 590 }
 591
 592 ComplexPairTy ComplexExprEmitter::VisitPlus(const UnaryOperator *E,
 593                                             QualType PromotionType) {
 594   TestAndClearIgnoreReal();
 595   TestAndClearIgnoreImag();
 596   if (!PromotionType.isNull())
 597     return CGF.EmitPromotedComplexExpr(E->getSubExpr(), PromotionType);
 598   return Visit(E->getSubExpr());
 599 }
 600
 601 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E,
 602                                                   QualType PromotionType) {
 603   QualType promotionTy = PromotionType.isNull()
 604                              ? getPromotionType(E->getSubExpr()->getType())
 605                              : PromotionType;
 606   ComplexPairTy result = VisitMinus(E, promotionTy);
 607   if (!promotionTy.isNull())
 608     return CGF.EmitUnPromotedValue(result, E->getSubExpr()->getType());
 609   return result;
 610 }
 611 ComplexPairTy ComplexExprEmitter::VisitMinus(const UnaryOperator *E,
 612                                              QualType PromotionType) {
 613   TestAndClearIgnoreReal();
 614   TestAndClearIgnoreImag();
 615   ComplexPairTy Op;
 616   if (!PromotionType.isNull())
 617     Op = CGF.EmitPromotedComplexExpr(E->getSubExpr(), PromotionType);
 618   else
 619     Op = Visit(E->getSubExpr());
 620
 621   llvm::Value *ResR, *ResI;
 622   if (Op.first->getType()->isFloatingPointTy()) {
 623     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
 624     ResI = Builder.CreateFNeg(Op.second, "neg.i");
 625   } else {
 626     ResR = Builder.CreateNeg(Op.first,  "neg.r");
 627     ResI = Builder.CreateNeg(Op.second, "neg.i");
 628   }
 629   return ComplexPairTy(ResR, ResI);
 630 }
 631
 632 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
 633   TestAndClearIgnoreReal();
 634   TestAndClearIgnoreImag();
 635   // ~(a+ib) = a + i*-b
 636   ComplexPairTy Op = Visit(E->getSubExpr());
 637   llvm::Value *ResI;
 638   if (Op.second->getType()->isFloatingPointTy())
 639     ResI = Builder.CreateFNeg(Op.second, "conj.i");
 640   else
 641     ResI = Builder.CreateNeg(Op.second, "conj.i");
 642
 643   return ComplexPairTy(Op.first, ResI);
 644 }
 645
 646 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
 647   llvm::Value *ResR, *ResI;
 648
 649   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 650     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 651     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
 652     if (Op.LHS.second && Op.RHS.second)
 653       ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
 654     else
 655       ResI = Op.LHS.second ? Op.LHS.second : Op.RHS.second;
 656     assert(ResI && "Only one operand may be real!");
 657   } else {
 658     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
 659     assert(Op.LHS.second && Op.RHS.second &&
 660            "Both operands of integer complex operators must be complex!");
 661     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
 662   }
 663   return ComplexPairTy(ResR, ResI);
 664 }
 665
 666 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
 667   llvm::Value *ResR, *ResI;
 668   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 669     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 670     ResR = Builder.CreateFSub(Op.LHS.first, Op.RHS.first, "sub.r");
 671     if (Op.LHS.second && Op.RHS.second)
 672       ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
 673     else
 674       ResI = Op.LHS.second ? Op.LHS.second
 675                            : Builder.CreateFNeg(Op.RHS.second, "sub.i");
 676     assert(ResI && "Only one operand may be real!");
 677   } else {
 678     ResR = Builder.CreateSub(Op.LHS.first, Op.RHS.first, "sub.r");
 679     assert(Op.LHS.second && Op.RHS.second &&
 680            "Both operands of integer complex operators must be complex!");
 681     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
 682   }
 683   return ComplexPairTy(ResR, ResI);
 684 }
 685
 686 /// Emit a libcall for a binary operation on complex types.
 687 ComplexPairTy ComplexExprEmitter::EmitComplexBinOpLibCall(StringRef LibCallName,
 688                                                           const BinOpInfo &Op) {
 689   CallArgList Args;
 690   Args.add(RValue::get(Op.LHS.first),
 691            Op.Ty->castAs<ComplexType>()->getElementType());
 692   Args.add(RValue::get(Op.LHS.second),
 693            Op.Ty->castAs<ComplexType>()->getElementType());
 694   Args.add(RValue::get(Op.RHS.first),
 695            Op.Ty->castAs<ComplexType>()->getElementType());
 696   Args.add(RValue::get(Op.RHS.second),
 697            Op.Ty->castAs<ComplexType>()->getElementType());
 698
 699   // We *must* use the full CG function call building logic here because the
 700   // complex type has special ABI handling. We also should not forget about
 701   // special calling convention which may be used for compiler builtins.
 702
 703   // We create a function qualified type to state that this call does not have
 704   // any exceptions.
 705   FunctionProtoType::ExtProtoInfo EPI;
 706   EPI = EPI.withExceptionSpec(
 707       FunctionProtoType::ExceptionSpecInfo(EST_BasicNoexcept));
 708   SmallVector<QualType, 4> ArgsQTys(
 709       4, Op.Ty->castAs<ComplexType>()->getElementType());
 710   QualType FQTy = CGF.getContext().getFunctionType(Op.Ty, ArgsQTys, EPI);
 711   const CGFunctionInfo &FuncInfo = CGF.CGM.getTypes().arrangeFreeFunctionCall(
 712       Args, cast<FunctionType>(FQTy.getTypePtr()), false);
 713
 714   llvm::FunctionType *FTy = CGF.CGM.getTypes().GetFunctionType(FuncInfo);
 715   llvm::FunctionCallee Func = CGF.CGM.CreateRuntimeFunction(
 716       FTy, LibCallName, llvm::AttributeList(), true);
 717   CGCallee Callee = CGCallee::forDirect(Func, FQTy->getAs<FunctionProtoType>());
 718
 719   llvm::CallBase *Call;
 720   RValue Res = CGF.EmitCall(FuncInfo, Callee, ReturnValueSlot(), Args, &Call);
 721   Call->setCallingConv(CGF.CGM.getRuntimeCC());
 722   return Res.getComplexVal();
 723 }
 724
 725 /// Lookup the libcall name for a given floating point type complex
 726 /// multiply.
 727 static StringRef getComplexMultiplyLibCallName(llvm::Type *Ty) {
 728   switch (Ty->getTypeID()) {
 729   default:
 730     llvm_unreachable("Unsupported floating point type!");
 731   case llvm::Type::HalfTyID:
 732     return "__mulhc3";
 733   case llvm::Type::FloatTyID:
 734     return "__mulsc3";
 735   case llvm::Type::DoubleTyID:
 736     return "__muldc3";
 737   case llvm::Type::PPC_FP128TyID:
 738     return "__multc3";
 739   case llvm::Type::X86_FP80TyID:
 740     return "__mulxc3";
 741   case llvm::Type::FP128TyID:
 742     return "__multc3";
 743   }
 744 }
 745
 746 // See C11 Annex G.5.1 for the semantics of multiplicative operators on complex
 747 // typed values.
 748 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
 749   using llvm::Value;
 750   Value *ResR, *ResI;
 751   llvm::MDBuilder MDHelper(CGF.getLLVMContext());
 752
 753   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 754     // The general formulation is:
 755     // (a + ib) * (c + id) = (a * c - b * d) + i(a * d + b * c)
 756     //
 757     // But we can fold away components which would be zero due to a real
 758     // operand according to C11 Annex G.5.1p2.
 759     // FIXME: C11 also provides for imaginary types which would allow folding
 760     // still more of this within the type system.
 761
 762     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 763     if (Op.LHS.second && Op.RHS.second) {
 764       // If both operands are complex, emit the core math directly, and then
 765       // test for NaNs. If we find NaNs in the result, we delegate to a libcall
 766       // to carefully re-compute the correct infinity representation if
 767       // possible. The expectation is that the presence of NaNs here is
 768       // *extremely* rare, and so the cost of the libcall is almost irrelevant.
 769       // This is good, because the libcall re-computes the core multiplication
 770       // exactly the same as we do here and re-tests for NaNs in order to be
 771       // a generic complex*complex libcall.
 772
 773       // First compute the four products.
 774       Value *AC = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul_ac");
 775       Value *BD = Builder.CreateFMul(Op.LHS.second, Op.RHS.second, "mul_bd");
 776       Value *AD = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul_ad");
 777       Value *BC = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul_bc");
 778
 779       // The real part is the difference of the first two, the imaginary part is
 780       // the sum of the second.
 781       ResR = Builder.CreateFSub(AC, BD, "mul_r");
 782       ResI = Builder.CreateFAdd(AD, BC, "mul_i");
 783
 784       // Emit the test for the real part becoming NaN and create a branch to
 785       // handle it. We test for NaN by comparing the number to itself.
 786       Value *IsRNaN = Builder.CreateFCmpUNO(ResR, ResR, "isnan_cmp");
 787       llvm::BasicBlock *ContBB = CGF.createBasicBlock("complex_mul_cont");
 788       llvm::BasicBlock *INaNBB = CGF.createBasicBlock("complex_mul_imag_nan");
 789       llvm::Instruction *Branch = Builder.CreateCondBr(IsRNaN, INaNBB, ContBB);
 790       llvm::BasicBlock *OrigBB = Branch->getParent();
 791
 792       // Give hint that we very much don't expect to see NaNs.
 793       // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
 794       llvm::MDNode *BrWeight = MDHelper.createBranchWeights(1, (1U << 20) - 1);
 795       Branch->setMetadata(llvm::LLVMContext::MD_prof, BrWeight);
 796
 797       // Now test the imaginary part and create its branch.
 798       CGF.EmitBlock(INaNBB);
 799       Value *IsINaN = Builder.CreateFCmpUNO(ResI, ResI, "isnan_cmp");
 800       llvm::BasicBlock *LibCallBB = CGF.createBasicBlock("complex_mul_libcall");
 801       Branch = Builder.CreateCondBr(IsINaN, LibCallBB, ContBB);
 802       Branch->setMetadata(llvm::LLVMContext::MD_prof, BrWeight);
 803
 804       // Now emit the libcall on this slowest of the slow paths.
 805       CGF.EmitBlock(LibCallBB);
 806       Value *LibCallR, *LibCallI;
 807       std::tie(LibCallR, LibCallI) = EmitComplexBinOpLibCall(
 808           getComplexMultiplyLibCallName(Op.LHS.first->getType()), Op);
 809       Builder.CreateBr(ContBB);
 810
 811       // Finally continue execution by phi-ing together the different
 812       // computation paths.
 813       CGF.EmitBlock(ContBB);
 814       llvm::PHINode *RealPHI = Builder.CreatePHI(ResR->getType(), 3, "real_mul_phi");
 815       RealPHI->addIncoming(ResR, OrigBB);
 816       RealPHI->addIncoming(ResR, INaNBB);
 817       RealPHI->addIncoming(LibCallR, LibCallBB);
 818       llvm::PHINode *ImagPHI = Builder.CreatePHI(ResI->getType(), 3, "imag_mul_phi");
 819       ImagPHI->addIncoming(ResI, OrigBB);
 820       ImagPHI->addIncoming(ResI, INaNBB);
 821       ImagPHI->addIncoming(LibCallI, LibCallBB);
 822       return ComplexPairTy(RealPHI, ImagPHI);
 823     }
 824     assert((Op.LHS.second || Op.RHS.second) &&
 825            "At least one operand must be complex!");
 826
 827     // If either of the operands is a real rather than a complex, the
 828     // imaginary component is ignored when computing the real component of the
 829     // result.
 830     ResR = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
 831
 832     ResI = Op.LHS.second
 833                ? Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il")
 834                : Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
 835   } else {
 836     assert(Op.LHS.second && Op.RHS.second &&
 837            "Both operands of integer complex operators must be complex!");
 838     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
 839     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second, "mul.rr");
 840     ResR = Builder.CreateSub(ResRl, ResRr, "mul.r");
 841
 842     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
 843     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
 844     ResI = Builder.CreateAdd(ResIl, ResIr, "mul.i");
 845   }
 846   return ComplexPairTy(ResR, ResI);
 847 }
 848
 849 // See C11 Annex G.5.1 for the semantics of multiplicative operators on complex
 850 // typed values.
 851 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
 852   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
 853   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
 854
 855   llvm::Value *DSTr, *DSTi;
 856   if (LHSr->getType()->isFloatingPointTy()) {
 857     // If we have a complex operand on the RHS and FastMath is not allowed, we
 858     // delegate to a libcall to handle all of the complexities and minimize
 859     // underflow/overflow cases. When FastMath is allowed we construct the
 860     // divide inline using the same algorithm as for integer operands.
 861     //
 862     // FIXME: We would be able to avoid the libcall in many places if we
 863     // supported imaginary types in addition to complex types.
 864     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 865     if (RHSi && !CGF.getLangOpts().FastMath) {
 866       BinOpInfo LibCallOp = Op;
 867       // If LHS was a real, supply a null imaginary part.
 868       if (!LHSi)
 869         LibCallOp.LHS.second = llvm::Constant::getNullValue(LHSr->getType());
 870
 871       switch (LHSr->getType()->getTypeID()) {
 872       default:
 873         llvm_unreachable("Unsupported floating point type!");
 874       case llvm::Type::HalfTyID:
 875         return EmitComplexBinOpLibCall("__divhc3", LibCallOp);
 876       case llvm::Type::FloatTyID:
 877         return EmitComplexBinOpLibCall("__divsc3", LibCallOp);
 878       case llvm::Type::DoubleTyID:
 879         return EmitComplexBinOpLibCall("__divdc3", LibCallOp);
 880       case llvm::Type::PPC_FP128TyID:
 881         return EmitComplexBinOpLibCall("__divtc3", LibCallOp);
 882       case llvm::Type::X86_FP80TyID:
 883         return EmitComplexBinOpLibCall("__divxc3", LibCallOp);
 884       case llvm::Type::FP128TyID:
 885         return EmitComplexBinOpLibCall("__divtc3", LibCallOp);
 886       }
 887     } else if (RHSi) {
 888       if (!LHSi)
 889         LHSi = llvm::Constant::getNullValue(RHSi->getType());
 890
 891       // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
 892       llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
 893       llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
 894       llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
 895
 896       llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
 897       llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
 898       llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
 899
 900       llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
 901       llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
 902       llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
 903
 904       DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
 905       DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
 906     } else {
 907       assert(LHSi && "Can have at most one non-complex operand!");
 908
 909       DSTr = Builder.CreateFDiv(LHSr, RHSr);
 910       DSTi = Builder.CreateFDiv(LHSi, RHSr);
 911     }
 912   } else {
 913     assert(Op.LHS.second && Op.RHS.second &&
 914            "Both operands of integer complex operators must be complex!");
 915     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
 916     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
 917     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
 918     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
 919
 920     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
 921     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
 922     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
 923
 924     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
 925     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
 926     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
 927
 928     if (Op.Ty->castAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
 929       DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
 930       DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
 931     } else {
 932       DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
 933       DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
 934     }
 935   }
 936
 937   return ComplexPairTy(DSTr, DSTi);
 938 }
 939
 940 ComplexPairTy CodeGenFunction::EmitUnPromotedValue(ComplexPairTy result,
 941                                                    QualType UnPromotionType) {
 942   llvm::Type *ComplexElementTy =
 943       ConvertType(UnPromotionType->castAs<ComplexType>()->getElementType());
 944   if (result.first)
 945     result.first =
 946         Builder.CreateFPTrunc(result.first, ComplexElementTy, "unpromotion");
 947   if (result.second)
 948     result.second =
 949         Builder.CreateFPTrunc(result.second, ComplexElementTy, "unpromotion");
 950   return result;
 951 }
 952
 953 ComplexPairTy CodeGenFunction::EmitPromotedValue(ComplexPairTy result,
 954                                                  QualType PromotionType) {
 955   llvm::Type *ComplexElementTy =
 956       ConvertType(PromotionType->castAs<ComplexType>()->getElementType());
 957   if (result.first)
 958     result.first = Builder.CreateFPExt(result.first, ComplexElementTy, "ext");
 959   if (result.second)
 960     result.second = Builder.CreateFPExt(result.second, ComplexElementTy, "ext");
 961
 962   return result;
 963 }
 964
 965 ComplexPairTy ComplexExprEmitter::EmitPromoted(const Expr *E,
 966                                                QualType PromotionType) {
 967   E = E->IgnoreParens();
 968   if (auto BO = dyn_cast<BinaryOperator>(E)) {
 969     switch (BO->getOpcode()) {
 970 #define HANDLE_BINOP(OP)                                                       \
 971   case BO_##OP:                                                                \
 972     return EmitBin##OP(EmitBinOps(BO, PromotionType));
 973       HANDLE_BINOP(Add)
 974       HANDLE_BINOP(Sub)
 975       HANDLE_BINOP(Mul)
 976       HANDLE_BINOP(Div)
 977 #undef HANDLE_BINOP
 978     default:
 979       break;
 980     }
 981   } else if (auto UO = dyn_cast<UnaryOperator>(E)) {
 982     switch (UO->getOpcode()) {
 983     case UO_Minus:
 984       return VisitMinus(UO, PromotionType);
 985     case UO_Plus:
 986       return VisitPlus(UO, PromotionType);
 987     default:
 988       break;
 989     }
 990   }
 991   auto result = Visit(const_cast<Expr *>(E));
 992   if (!PromotionType.isNull())
 993     return CGF.EmitPromotedValue(result, PromotionType);
 994   else
 995     return result;
 996 }
 997
 998 ComplexPairTy CodeGenFunction::EmitPromotedComplexExpr(const Expr *E,
 999                                                        QualType DstTy) {
1000   return ComplexExprEmitter(*this).EmitPromoted(E, DstTy);
1001 }
1002
1003 ComplexPairTy
1004 ComplexExprEmitter::EmitPromotedComplexOperand(const Expr *E,
1005                                                QualType OverallPromotionType) {
1006   if (E->getType()->isAnyComplexType()) {
1007     if (!OverallPromotionType.isNull())
1008       return CGF.EmitPromotedComplexExpr(E, OverallPromotionType);
1009     else
1010       return Visit(const_cast<Expr *>(E));
1011   } else {
1012     if (!OverallPromotionType.isNull()) {
1013       QualType ComplexElementTy =
1014           OverallPromotionType->castAs<ComplexType>()->getElementType();
1015       return ComplexPairTy(CGF.EmitPromotedScalarExpr(E, ComplexElementTy),
1016                            nullptr);
1017     } else {
1018       return ComplexPairTy(CGF.EmitScalarExpr(E), nullptr);
1019     }
1020   }
1021 }
1022
1023 ComplexExprEmitter::BinOpInfo
1024 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E,
1025                                QualType PromotionType) {
1026   TestAndClearIgnoreReal();
1027   TestAndClearIgnoreImag();
1028   BinOpInfo Ops;
1029
1030   Ops.LHS = EmitPromotedComplexOperand(E->getLHS(), PromotionType);
1031   Ops.RHS = EmitPromotedComplexOperand(E->getRHS(), PromotionType);
1032   if (!PromotionType.isNull())
1033     Ops.Ty = PromotionType;
1034   else
1035     Ops.Ty = E->getType();
1036   Ops.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
1037   return Ops;
1038 }
1039
1040
1041 LValue ComplexExprEmitter::
1042 EmitCompoundAssignLValue(const CompoundAssignOperator *E,
1043           ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
1044                          RValue &Val) {
1045   TestAndClearIgnoreReal();
1046   TestAndClearIgnoreImag();
1047   QualType LHSTy = E->getLHS()->getType();
1048   if (const AtomicType *AT = LHSTy->getAs<AtomicType>())
1049     LHSTy = AT->getValueType();
1050
1051   BinOpInfo OpInfo;
1052   OpInfo.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
1053   CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, OpInfo.FPFeatures);
1054
1055   // Load the RHS and LHS operands.
1056   // __block variables need to have the rhs evaluated first, plus this should
1057   // improve codegen a little.
1058   QualType PromotionTypeCR;
1059   PromotionTypeCR = getPromotionType(E->getComputationResultType());
1060   if (PromotionTypeCR.isNull())
1061     PromotionTypeCR = E->getComputationResultType();
1062   OpInfo.Ty = PromotionTypeCR;
1063   QualType ComplexElementTy =
1064       OpInfo.Ty->castAs<ComplexType>()->getElementType();
1065   QualType PromotionTypeRHS = getPromotionType(E->getRHS()->getType());
1066
1067   // The RHS should have been converted to the computation type.
1068   if (E->getRHS()->getType()->isRealFloatingType()) {
1069     if (!PromotionTypeRHS.isNull())
1070       OpInfo.RHS = ComplexPairTy(
1071           CGF.EmitPromotedScalarExpr(E->getRHS(), PromotionTypeRHS), nullptr);
1072     else {
1073       assert(CGF.getContext().hasSameUnqualifiedType(ComplexElementTy,
1074                                                      E->getRHS()->getType()));
1075
1076       OpInfo.RHS = ComplexPairTy(CGF.EmitScalarExpr(E->getRHS()), nullptr);
1077     }
1078   } else {
1079     if (!PromotionTypeRHS.isNull()) {
1080       OpInfo.RHS = ComplexPairTy(
1081           CGF.EmitPromotedComplexExpr(E->getRHS(), PromotionTypeRHS));
1082     } else {
1083       assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
1084                                                      E->getRHS()->getType()));
1085       OpInfo.RHS = Visit(E->getRHS());
1086     }
1087   }
1088
1089   LValue LHS = CGF.EmitLValue(E->getLHS());
1090
1091   // Load from the l-value and convert it.
1092   SourceLocation Loc = E->getExprLoc();
1093   QualType PromotionTypeLHS = getPromotionType(E->getComputationLHSType());
1094   if (LHSTy->isAnyComplexType()) {
1095     ComplexPairTy LHSVal = EmitLoadOfLValue(LHS, Loc);
1096     if (!PromotionTypeLHS.isNull())
1097       OpInfo.LHS =
1098           EmitComplexToComplexCast(LHSVal, LHSTy, PromotionTypeLHS, Loc);
1099     else
1100       OpInfo.LHS = EmitComplexToComplexCast(LHSVal, LHSTy, OpInfo.Ty, Loc);
1101   } else {
1102     llvm::Value *LHSVal = CGF.EmitLoadOfScalar(LHS, Loc);
1103     // For floating point real operands we can directly pass the scalar form
1104     // to the binary operator emission and potentially get more efficient code.
1105     if (LHSTy->isRealFloatingType()) {
1106       QualType PromotedComplexElementTy;
1107       if (!PromotionTypeLHS.isNull()) {
1108         PromotedComplexElementTy =
1109             cast<ComplexType>(PromotionTypeLHS)->getElementType();
1110         if (!CGF.getContext().hasSameUnqualifiedType(PromotedComplexElementTy,
1111                                                      PromotionTypeLHS))
1112           LHSVal = CGF.EmitScalarConversion(LHSVal, LHSTy,
1113                                             PromotedComplexElementTy, Loc);
1114       } else {
1115         if (!CGF.getContext().hasSameUnqualifiedType(ComplexElementTy, LHSTy))
1116           LHSVal =
1117               CGF.EmitScalarConversion(LHSVal, LHSTy, ComplexElementTy, Loc);
1118       }
1119       OpInfo.LHS = ComplexPairTy(LHSVal, nullptr);
1120     } else {
1121       OpInfo.LHS = EmitScalarToComplexCast(LHSVal, LHSTy, OpInfo.Ty, Loc);
1122     }
1123   }
1124
1125   // Expand the binary operator.
1126   ComplexPairTy Result = (this->*Func)(OpInfo);
1127
1128   // Truncate the result and store it into the LHS lvalue.
1129   if (LHSTy->isAnyComplexType()) {
1130     ComplexPairTy ResVal =
1131         EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy, Loc);
1132     EmitStoreOfComplex(ResVal, LHS, /*isInit*/ false);
1133     Val = RValue::getComplex(ResVal);
1134   } else {
1135     llvm::Value *ResVal =
1136         CGF.EmitComplexToScalarConversion(Result, OpInfo.Ty, LHSTy, Loc);
1137     CGF.EmitStoreOfScalar(ResVal, LHS, /*isInit*/ false);
1138     Val = RValue::get(ResVal);
1139   }
1140
1141   return LHS;
1142 }
1143
1144 // Compound assignments.
1145 ComplexPairTy ComplexExprEmitter::
1146 EmitCompoundAssign(const CompoundAssignOperator *E,
1147                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
1148   RValue Val;
1149   LValue LV = EmitCompoundAssignLValue(E, Func, Val);
1150
1151   // The result of an assignment in C is the assigned r-value.
1152   if (!CGF.getLangOpts().CPlusPlus)
1153     return Val.getComplexVal();
1154
1155   // If the lvalue is non-volatile, return the computed value of the assignment.
1156   if (!LV.isVolatileQualified())
1157     return Val.getComplexVal();
1158
1159   return EmitLoadOfLValue(LV, E->getExprLoc());
1160 }
1161
1162 LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
1163                                                ComplexPairTy &Val) {
1164   assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
1165                                                  E->getRHS()->getType()) &&
1166          "Invalid assignment");
1167   TestAndClearIgnoreReal();
1168   TestAndClearIgnoreImag();
1169
1170   // Emit the RHS.  __block variables need the RHS evaluated first.
1171   Val = Visit(E->getRHS());
1172
1173   // Compute the address to store into.
1174   LValue LHS = CGF.EmitLValue(E->getLHS());
1175
1176   // Store the result value into the LHS lvalue.
1177   EmitStoreOfComplex(Val, LHS, /*isInit*/ false);
1178
1179   return LHS;
1180 }
1181
1182 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
1183   ComplexPairTy Val;
1184   LValue LV = EmitBinAssignLValue(E, Val);
1185
1186   // The result of an assignment in C is the assigned r-value.
1187   if (!CGF.getLangOpts().CPlusPlus)
1188     return Val;
1189
1190   // If the lvalue is non-volatile, return the computed value of the assignment.
1191   if (!LV.isVolatileQualified())
1192     return Val;
1193
1194   return EmitLoadOfLValue(LV, E->getExprLoc());
1195 }
1196
1197 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
1198   CGF.EmitIgnoredExpr(E->getLHS());
1199   return Visit(E->getRHS());
1200 }
1201
1202 ComplexPairTy ComplexExprEmitter::
1203 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
1204   TestAndClearIgnoreReal();
1205   TestAndClearIgnoreImag();
1206   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
1207   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
1208   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
1209
1210   // Bind the common expression if necessary.
1211   CodeGenFunction::OpaqueValueMapping binding(CGF, E);
1212
1213
1214   CodeGenFunction::ConditionalEvaluation eval(CGF);
1215   CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock,
1216                            CGF.getProfileCount(E));
1217
1218   eval.begin(CGF);
1219   CGF.EmitBlock(LHSBlock);
1220   CGF.incrementProfileCounter(E);
1221   ComplexPairTy LHS = Visit(E->getTrueExpr());
1222   LHSBlock = Builder.GetInsertBlock();
1223   CGF.EmitBranch(ContBlock);
1224   eval.end(CGF);
1225
1226   eval.begin(CGF);
1227   CGF.EmitBlock(RHSBlock);
1228   ComplexPairTy RHS = Visit(E->getFalseExpr());
1229   RHSBlock = Builder.GetInsertBlock();
1230   CGF.EmitBlock(ContBlock);
1231   eval.end(CGF);
1232
1233   // Create a PHI node for the real part.
1234   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
1235   RealPN->addIncoming(LHS.first, LHSBlock);
1236   RealPN->addIncoming(RHS.first, RHSBlock);
1237
1238   // Create a PHI node for the imaginary part.
1239   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
1240   ImagPN->addIncoming(LHS.second, LHSBlock);
1241   ImagPN->addIncoming(RHS.second, RHSBlock);
1242
1243   return ComplexPairTy(RealPN, ImagPN);
1244 }
1245
1246 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
1247   return Visit(E->getChosenSubExpr());
1248 }
1249
1250 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
1251     bool Ignore = TestAndClearIgnoreReal();
1252     (void)Ignore;
1253     assert (Ignore == false && "init list ignored");
1254     Ignore = TestAndClearIgnoreImag();
1255     (void)Ignore;
1256     assert (Ignore == false && "init list ignored");
1257
1258   if (E->getNumInits() == 2) {
1259     llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
1260     llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
1261     return ComplexPairTy(Real, Imag);
1262   } else if (E->getNumInits() == 1) {
1263     return Visit(E->getInit(0));
1264   }
1265
1266   // Empty init list initializes to null
1267   assert(E->getNumInits() == 0 && "Unexpected number of inits");
1268   QualType Ty = E->getType()->castAs<ComplexType>()->getElementType();
1269   llvm::Type* LTy = CGF.ConvertType(Ty);
1270   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
1271   return ComplexPairTy(zeroConstant, zeroConstant);
1272 }
1273
1274 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
1275   Address ArgValue = Address::invalid();
1276   Address ArgPtr = CGF.EmitVAArg(E, ArgValue);
1277
1278   if (!ArgPtr.isValid()) {
1279     CGF.ErrorUnsupported(E, "complex va_arg expression");
1280     llvm::Type *EltTy =
1281       CGF.ConvertType(E->getType()->castAs<ComplexType>()->getElementType());
1282     llvm::Value *U = llvm::UndefValue::get(EltTy);
1283     return ComplexPairTy(U, U);
1284   }
1285
1286   return EmitLoadOfLValue(CGF.MakeAddrLValue(ArgPtr, E->getType()),
1287                           E->getExprLoc());
1288 }
1289
1290 //===----------------------------------------------------------------------===//
1291 //                         Entry Point into this File
1292 //===----------------------------------------------------------------------===//
1293
1294 /// EmitComplexExpr - Emit the computation of the specified expression of
1295 /// complex type, ignoring the result.
1296 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
1297                                                bool IgnoreImag) {
1298   assert(E && getComplexType(E->getType()) &&
1299          "Invalid complex expression to emit");
1300
1301   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
1302       .Visit(const_cast<Expr *>(E));
1303 }
1304
1305 void CodeGenFunction::EmitComplexExprIntoLValue(const Expr *E, LValue dest,
1306                                                 bool isInit) {
1307   assert(E && getComplexType(E->getType()) &&
1308          "Invalid complex expression to emit");
1309   ComplexExprEmitter Emitter(*this);
1310   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
1311   Emitter.EmitStoreOfComplex(Val, dest, isInit);
1312 }
1313
1314 /// EmitStoreOfComplex - Store a complex number into the specified l-value.
1315 void CodeGenFunction::EmitStoreOfComplex(ComplexPairTy V, LValue dest,
1316                                          bool isInit) {
1317   ComplexExprEmitter(*this).EmitStoreOfComplex(V, dest, isInit);
1318 }
1319
1320 /// EmitLoadOfComplex - Load a complex number from the specified address.
1321 ComplexPairTy CodeGenFunction::EmitLoadOfComplex(LValue src,
1322                                                  SourceLocation loc) {
1323   return ComplexExprEmitter(*this).EmitLoadOfLValue(src, loc);
1324 }
1325
1326 LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
1327   assert(E->getOpcode() == BO_Assign);
1328   ComplexPairTy Val; // ignored
1329   LValue LVal = ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
1330   if (getLangOpts().OpenMP)
1331     CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
1332                                                               E->getLHS());
1333   return LVal;
1334 }
1335
1336 typedef ComplexPairTy (ComplexExprEmitter::*CompoundFunc)(
1337     const ComplexExprEmitter::BinOpInfo &);
1338
1339 static CompoundFunc getComplexOp(BinaryOperatorKind Op) {
1340   switch (Op) {
1341   case BO_MulAssign: return &ComplexExprEmitter::EmitBinMul;
1342   case BO_DivAssign: return &ComplexExprEmitter::EmitBinDiv;
1343   case BO_SubAssign: return &ComplexExprEmitter::EmitBinSub;
1344   case BO_AddAssign: return &ComplexExprEmitter::EmitBinAdd;
1345   default:
1346     llvm_unreachable("unexpected complex compound assignment");
1347   }
1348 }
1349
1350 LValue CodeGenFunction::
1351 EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
1352   CompoundFunc Op = getComplexOp(E->getOpcode());
1353   RValue Val;
1354   return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
1355 }
1356
1357 LValue CodeGenFunction::
1358 EmitScalarCompoundAssignWithComplex(const CompoundAssignOperator *E,
1359                                     llvm::Value *&Result) {
1360   CompoundFunc Op = getComplexOp(E->getOpcode());
1361   RValue Val;
1362   LValue Ret = ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
1363   Result = Val.getScalarVal();
1364   return Ret;
1365 }