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