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).withElementType(CGF.ConvertType(DestTy));
 492     return EmitLoadOfLValue(CGF.MakeAddrLValue(V, DestTy), Op->getExprLoc());
 493   }
 494
 495   case CK_LValueToRValueBitCast: {
 496     LValue SourceLVal = CGF.EmitLValue(Op);
 497     Address Addr = SourceLVal.getAddress(CGF).withElementType(
 498         CGF.ConvertTypeForMem(DestTy));
 499     LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
 500     DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
 501     return EmitLoadOfLValue(DestLV, Op->getExprLoc());
 502   }
 503
 504   case CK_BitCast:
 505   case CK_BaseToDerived:
 506   case CK_DerivedToBase:
 507   case CK_UncheckedDerivedToBase:
 508   case CK_Dynamic:
 509   case CK_ToUnion:
 510   case CK_ArrayToPointerDecay:
 511   case CK_FunctionToPointerDecay:
 512   case CK_NullToPointer:
 513   case CK_NullToMemberPointer:
 514   case CK_BaseToDerivedMemberPointer:
 515   case CK_DerivedToBaseMemberPointer:
 516   case CK_MemberPointerToBoolean:
 517   case CK_ReinterpretMemberPointer:
 518   case CK_ConstructorConversion:
 519   case CK_IntegralToPointer:
 520   case CK_PointerToIntegral:
 521   case CK_PointerToBoolean:
 522   case CK_ToVoid:
 523   case CK_VectorSplat:
 524   case CK_IntegralCast:
 525   case CK_BooleanToSignedIntegral:
 526   case CK_IntegralToBoolean:
 527   case CK_IntegralToFloating:
 528   case CK_FloatingToIntegral:
 529   case CK_FloatingToBoolean:
 530   case CK_FloatingCast:
 531   case CK_CPointerToObjCPointerCast:
 532   case CK_BlockPointerToObjCPointerCast:
 533   case CK_AnyPointerToBlockPointerCast:
 534   case CK_ObjCObjectLValueCast:
 535   case CK_FloatingComplexToReal:
 536   case CK_FloatingComplexToBoolean:
 537   case CK_IntegralComplexToReal:
 538   case CK_IntegralComplexToBoolean:
 539   case CK_ARCProduceObject:
 540   case CK_ARCConsumeObject:
 541   case CK_ARCReclaimReturnedObject:
 542   case CK_ARCExtendBlockObject:
 543   case CK_CopyAndAutoreleaseBlockObject:
 544   case CK_BuiltinFnToFnPtr:
 545   case CK_ZeroToOCLOpaqueType:
 546   case CK_AddressSpaceConversion:
 547   case CK_IntToOCLSampler:
 548   case CK_FloatingToFixedPoint:
 549   case CK_FixedPointToFloating:
 550   case CK_FixedPointCast:
 551   case CK_FixedPointToBoolean:
 552   case CK_FixedPointToIntegral:
 553   case CK_IntegralToFixedPoint:
 554   case CK_MatrixCast:
 555     llvm_unreachable("invalid cast kind for complex value");
 556
 557   case CK_FloatingRealToComplex:
 558   case CK_IntegralRealToComplex: {
 559     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op);
 560     return EmitScalarToComplexCast(CGF.EmitScalarExpr(Op), Op->getType(),
 561                                    DestTy, Op->getExprLoc());
 562   }
 563
 564   case CK_FloatingComplexCast:
 565   case CK_FloatingComplexToIntegralComplex:
 566   case CK_IntegralComplexCast:
 567   case CK_IntegralComplexToFloatingComplex: {
 568     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op);
 569     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy,
 570                                     Op->getExprLoc());
 571   }
 572   }
 573
 574   llvm_unreachable("unknown cast resulting in complex value");
 575 }
 576
 577 ComplexPairTy ComplexExprEmitter::VisitUnaryPlus(const UnaryOperator *E,
 578                                                  QualType PromotionType) {
 579   QualType promotionTy = PromotionType.isNull()
 580                              ? getPromotionType(E->getSubExpr()->getType())
 581                              : PromotionType;
 582   ComplexPairTy result = VisitPlus(E, promotionTy);
 583   if (!promotionTy.isNull())
 584     return CGF.EmitUnPromotedValue(result, E->getSubExpr()->getType());
 585   return result;
 586 }
 587
 588 ComplexPairTy ComplexExprEmitter::VisitPlus(const UnaryOperator *E,
 589                                             QualType PromotionType) {
 590   TestAndClearIgnoreReal();
 591   TestAndClearIgnoreImag();
 592   if (!PromotionType.isNull())
 593     return CGF.EmitPromotedComplexExpr(E->getSubExpr(), PromotionType);
 594   return Visit(E->getSubExpr());
 595 }
 596
 597 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E,
 598                                                   QualType PromotionType) {
 599   QualType promotionTy = PromotionType.isNull()
 600                              ? getPromotionType(E->getSubExpr()->getType())
 601                              : PromotionType;
 602   ComplexPairTy result = VisitMinus(E, promotionTy);
 603   if (!promotionTy.isNull())
 604     return CGF.EmitUnPromotedValue(result, E->getSubExpr()->getType());
 605   return result;
 606 }
 607 ComplexPairTy ComplexExprEmitter::VisitMinus(const UnaryOperator *E,
 608                                              QualType PromotionType) {
 609   TestAndClearIgnoreReal();
 610   TestAndClearIgnoreImag();
 611   ComplexPairTy Op;
 612   if (!PromotionType.isNull())
 613     Op = CGF.EmitPromotedComplexExpr(E->getSubExpr(), PromotionType);
 614   else
 615     Op = Visit(E->getSubExpr());
 616
 617   llvm::Value *ResR, *ResI;
 618   if (Op.first->getType()->isFloatingPointTy()) {
 619     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
 620     ResI = Builder.CreateFNeg(Op.second, "neg.i");
 621   } else {
 622     ResR = Builder.CreateNeg(Op.first,  "neg.r");
 623     ResI = Builder.CreateNeg(Op.second, "neg.i");
 624   }
 625   return ComplexPairTy(ResR, ResI);
 626 }
 627
 628 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
 629   TestAndClearIgnoreReal();
 630   TestAndClearIgnoreImag();
 631   // ~(a+ib) = a + i*-b
 632   ComplexPairTy Op = Visit(E->getSubExpr());
 633   llvm::Value *ResI;
 634   if (Op.second->getType()->isFloatingPointTy())
 635     ResI = Builder.CreateFNeg(Op.second, "conj.i");
 636   else
 637     ResI = Builder.CreateNeg(Op.second, "conj.i");
 638
 639   return ComplexPairTy(Op.first, ResI);
 640 }
 641
 642 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
 643   llvm::Value *ResR, *ResI;
 644
 645   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 646     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 647     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
 648     if (Op.LHS.second && Op.RHS.second)
 649       ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
 650     else
 651       ResI = Op.LHS.second ? Op.LHS.second : Op.RHS.second;
 652     assert(ResI && "Only one operand may be real!");
 653   } else {
 654     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
 655     assert(Op.LHS.second && Op.RHS.second &&
 656            "Both operands of integer complex operators must be complex!");
 657     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
 658   }
 659   return ComplexPairTy(ResR, ResI);
 660 }
 661
 662 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
 663   llvm::Value *ResR, *ResI;
 664   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 665     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 666     ResR = Builder.CreateFSub(Op.LHS.first, Op.RHS.first, "sub.r");
 667     if (Op.LHS.second && Op.RHS.second)
 668       ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
 669     else
 670       ResI = Op.LHS.second ? Op.LHS.second
 671                            : Builder.CreateFNeg(Op.RHS.second, "sub.i");
 672     assert(ResI && "Only one operand may be real!");
 673   } else {
 674     ResR = Builder.CreateSub(Op.LHS.first, Op.RHS.first, "sub.r");
 675     assert(Op.LHS.second && Op.RHS.second &&
 676            "Both operands of integer complex operators must be complex!");
 677     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
 678   }
 679   return ComplexPairTy(ResR, ResI);
 680 }
 681
 682 /// Emit a libcall for a binary operation on complex types.
 683 ComplexPairTy ComplexExprEmitter::EmitComplexBinOpLibCall(StringRef LibCallName,
 684                                                           const BinOpInfo &Op) {
 685   CallArgList Args;
 686   Args.add(RValue::get(Op.LHS.first),
 687            Op.Ty->castAs<ComplexType>()->getElementType());
 688   Args.add(RValue::get(Op.LHS.second),
 689            Op.Ty->castAs<ComplexType>()->getElementType());
 690   Args.add(RValue::get(Op.RHS.first),
 691            Op.Ty->castAs<ComplexType>()->getElementType());
 692   Args.add(RValue::get(Op.RHS.second),
 693            Op.Ty->castAs<ComplexType>()->getElementType());
 694
 695   // We *must* use the full CG function call building logic here because the
 696   // complex type has special ABI handling. We also should not forget about
 697   // special calling convention which may be used for compiler builtins.
 698
 699   // We create a function qualified type to state that this call does not have
 700   // any exceptions.
 701   FunctionProtoType::ExtProtoInfo EPI;
 702   EPI = EPI.withExceptionSpec(
 703       FunctionProtoType::ExceptionSpecInfo(EST_BasicNoexcept));
 704   SmallVector<QualType, 4> ArgsQTys(
 705       4, Op.Ty->castAs<ComplexType>()->getElementType());
 706   QualType FQTy = CGF.getContext().getFunctionType(Op.Ty, ArgsQTys, EPI);
 707   const CGFunctionInfo &FuncInfo = CGF.CGM.getTypes().arrangeFreeFunctionCall(
 708       Args, cast<FunctionType>(FQTy.getTypePtr()), false);
 709
 710   llvm::FunctionType *FTy = CGF.CGM.getTypes().GetFunctionType(FuncInfo);
 711   llvm::FunctionCallee Func = CGF.CGM.CreateRuntimeFunction(
 712       FTy, LibCallName, llvm::AttributeList(), true);
 713   CGCallee Callee = CGCallee::forDirect(Func, FQTy->getAs<FunctionProtoType>());
 714
 715   llvm::CallBase *Call;
 716   RValue Res = CGF.EmitCall(FuncInfo, Callee, ReturnValueSlot(), Args, &Call);
 717   Call->setCallingConv(CGF.CGM.getRuntimeCC());
 718   return Res.getComplexVal();
 719 }
 720
 721 /// Lookup the libcall name for a given floating point type complex
 722 /// multiply.
 723 static StringRef getComplexMultiplyLibCallName(llvm::Type *Ty) {
 724   switch (Ty->getTypeID()) {
 725   default:
 726     llvm_unreachable("Unsupported floating point type!");
 727   case llvm::Type::HalfTyID:
 728     return "__mulhc3";
 729   case llvm::Type::FloatTyID:
 730     return "__mulsc3";
 731   case llvm::Type::DoubleTyID:
 732     return "__muldc3";
 733   case llvm::Type::PPC_FP128TyID:
 734     return "__multc3";
 735   case llvm::Type::X86_FP80TyID:
 736     return "__mulxc3";
 737   case llvm::Type::FP128TyID:
 738     return "__multc3";
 739   }
 740 }
 741
 742 // See C11 Annex G.5.1 for the semantics of multiplicative operators on complex
 743 // typed values.
 744 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
 745   using llvm::Value;
 746   Value *ResR, *ResI;
 747   llvm::MDBuilder MDHelper(CGF.getLLVMContext());
 748
 749   if (Op.LHS.first->getType()->isFloatingPointTy()) {
 750     // The general formulation is:
 751     // (a + ib) * (c + id) = (a * c - b * d) + i(a * d + b * c)
 752     //
 753     // But we can fold away components which would be zero due to a real
 754     // operand according to C11 Annex G.5.1p2.
 755     // FIXME: C11 also provides for imaginary types which would allow folding
 756     // still more of this within the type system.
 757
 758     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 759     if (Op.LHS.second && Op.RHS.second) {
 760       // If both operands are complex, emit the core math directly, and then
 761       // test for NaNs. If we find NaNs in the result, we delegate to a libcall
 762       // to carefully re-compute the correct infinity representation if
 763       // possible. The expectation is that the presence of NaNs here is
 764       // *extremely* rare, and so the cost of the libcall is almost irrelevant.
 765       // This is good, because the libcall re-computes the core multiplication
 766       // exactly the same as we do here and re-tests for NaNs in order to be
 767       // a generic complex*complex libcall.
 768
 769       // First compute the four products.
 770       Value *AC = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul_ac");
 771       Value *BD = Builder.CreateFMul(Op.LHS.second, Op.RHS.second, "mul_bd");
 772       Value *AD = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul_ad");
 773       Value *BC = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul_bc");
 774
 775       // The real part is the difference of the first two, the imaginary part is
 776       // the sum of the second.
 777       ResR = Builder.CreateFSub(AC, BD, "mul_r");
 778       ResI = Builder.CreateFAdd(AD, BC, "mul_i");
 779
 780       // Emit the test for the real part becoming NaN and create a branch to
 781       // handle it. We test for NaN by comparing the number to itself.
 782       Value *IsRNaN = Builder.CreateFCmpUNO(ResR, ResR, "isnan_cmp");
 783       llvm::BasicBlock *ContBB = CGF.createBasicBlock("complex_mul_cont");
 784       llvm::BasicBlock *INaNBB = CGF.createBasicBlock("complex_mul_imag_nan");
 785       llvm::Instruction *Branch = Builder.CreateCondBr(IsRNaN, INaNBB, ContBB);
 786       llvm::BasicBlock *OrigBB = Branch->getParent();
 787
 788       // Give hint that we very much don't expect to see NaNs.
 789       // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
 790       llvm::MDNode *BrWeight = MDHelper.createBranchWeights(1, (1U << 20) - 1);
 791       Branch->setMetadata(llvm::LLVMContext::MD_prof, BrWeight);
 792
 793       // Now test the imaginary part and create its branch.
 794       CGF.EmitBlock(INaNBB);
 795       Value *IsINaN = Builder.CreateFCmpUNO(ResI, ResI, "isnan_cmp");
 796       llvm::BasicBlock *LibCallBB = CGF.createBasicBlock("complex_mul_libcall");
 797       Branch = Builder.CreateCondBr(IsINaN, LibCallBB, ContBB);
 798       Branch->setMetadata(llvm::LLVMContext::MD_prof, BrWeight);
 799
 800       // Now emit the libcall on this slowest of the slow paths.
 801       CGF.EmitBlock(LibCallBB);
 802       Value *LibCallR, *LibCallI;
 803       std::tie(LibCallR, LibCallI) = EmitComplexBinOpLibCall(
 804           getComplexMultiplyLibCallName(Op.LHS.first->getType()), Op);
 805       Builder.CreateBr(ContBB);
 806
 807       // Finally continue execution by phi-ing together the different
 808       // computation paths.
 809       CGF.EmitBlock(ContBB);
 810       llvm::PHINode *RealPHI = Builder.CreatePHI(ResR->getType(), 3, "real_mul_phi");
 811       RealPHI->addIncoming(ResR, OrigBB);
 812       RealPHI->addIncoming(ResR, INaNBB);
 813       RealPHI->addIncoming(LibCallR, LibCallBB);
 814       llvm::PHINode *ImagPHI = Builder.CreatePHI(ResI->getType(), 3, "imag_mul_phi");
 815       ImagPHI->addIncoming(ResI, OrigBB);
 816       ImagPHI->addIncoming(ResI, INaNBB);
 817       ImagPHI->addIncoming(LibCallI, LibCallBB);
 818       return ComplexPairTy(RealPHI, ImagPHI);
 819     }
 820     assert((Op.LHS.second || Op.RHS.second) &&
 821            "At least one operand must be complex!");
 822
 823     // If either of the operands is a real rather than a complex, the
 824     // imaginary component is ignored when computing the real component of the
 825     // result.
 826     ResR = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
 827
 828     ResI = Op.LHS.second
 829                ? Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il")
 830                : Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
 831   } else {
 832     assert(Op.LHS.second && Op.RHS.second &&
 833            "Both operands of integer complex operators must be complex!");
 834     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
 835     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second, "mul.rr");
 836     ResR = Builder.CreateSub(ResRl, ResRr, "mul.r");
 837
 838     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
 839     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
 840     ResI = Builder.CreateAdd(ResIl, ResIr, "mul.i");
 841   }
 842   return ComplexPairTy(ResR, ResI);
 843 }
 844
 845 // See C11 Annex G.5.1 for the semantics of multiplicative operators on complex
 846 // typed values.
 847 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
 848   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
 849   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
 850
 851   llvm::Value *DSTr, *DSTi;
 852   if (LHSr->getType()->isFloatingPointTy()) {
 853     // If we have a complex operand on the RHS and FastMath is not allowed, we
 854     // delegate to a libcall to handle all of the complexities and minimize
 855     // underflow/overflow cases. When FastMath is allowed we construct the
 856     // divide inline using the same algorithm as for integer operands.
 857     //
 858     // FIXME: We would be able to avoid the libcall in many places if we
 859     // supported imaginary types in addition to complex types.
 860     CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
 861     if (RHSi && !CGF.getLangOpts().FastMath) {
 862       BinOpInfo LibCallOp = Op;
 863       // If LHS was a real, supply a null imaginary part.
 864       if (!LHSi)
 865         LibCallOp.LHS.second = llvm::Constant::getNullValue(LHSr->getType());
 866
 867       switch (LHSr->getType()->getTypeID()) {
 868       default:
 869         llvm_unreachable("Unsupported floating point type!");
 870       case llvm::Type::HalfTyID:
 871         return EmitComplexBinOpLibCall("__divhc3", LibCallOp);
 872       case llvm::Type::FloatTyID:
 873         return EmitComplexBinOpLibCall("__divsc3", LibCallOp);
 874       case llvm::Type::DoubleTyID:
 875         return EmitComplexBinOpLibCall("__divdc3", LibCallOp);
 876       case llvm::Type::PPC_FP128TyID:
 877         return EmitComplexBinOpLibCall("__divtc3", LibCallOp);
 878       case llvm::Type::X86_FP80TyID:
 879         return EmitComplexBinOpLibCall("__divxc3", LibCallOp);
 880       case llvm::Type::FP128TyID:
 881         return EmitComplexBinOpLibCall("__divtc3", LibCallOp);
 882       }
 883     } else if (RHSi) {
 884       if (!LHSi)
 885         LHSi = llvm::Constant::getNullValue(RHSi->getType());
 886
 887       // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
 888       llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
 889       llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
 890       llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
 891
 892       llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
 893       llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
 894       llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
 895
 896       llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
 897       llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
 898       llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
 899
 900       DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
 901       DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
 902     } else {
 903       assert(LHSi && "Can have at most one non-complex operand!");
 904
 905       DSTr = Builder.CreateFDiv(LHSr, RHSr);
 906       DSTi = Builder.CreateFDiv(LHSi, RHSr);
 907     }
 908   } else {
 909     assert(Op.LHS.second && Op.RHS.second &&
 910            "Both operands of integer complex operators must be complex!");
 911     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
 912     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
 913     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
 914     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
 915
 916     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
 917     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
 918     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
 919
 920     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
 921     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
 922     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
 923
 924     if (Op.Ty->castAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
 925       DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
 926       DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
 927     } else {
 928       DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
 929       DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
 930     }
 931   }
 932
 933   return ComplexPairTy(DSTr, DSTi);
 934 }
 935
 936 ComplexPairTy CodeGenFunction::EmitUnPromotedValue(ComplexPairTy result,
 937                                                    QualType UnPromotionType) {
 938   llvm::Type *ComplexElementTy =
 939       ConvertType(UnPromotionType->castAs<ComplexType>()->getElementType());
 940   if (result.first)
 941     result.first =
 942         Builder.CreateFPTrunc(result.first, ComplexElementTy, "unpromotion");
 943   if (result.second)
 944     result.second =
 945         Builder.CreateFPTrunc(result.second, ComplexElementTy, "unpromotion");
 946   return result;
 947 }
 948
 949 ComplexPairTy CodeGenFunction::EmitPromotedValue(ComplexPairTy result,
 950                                                  QualType PromotionType) {
 951   llvm::Type *ComplexElementTy =
 952       ConvertType(PromotionType->castAs<ComplexType>()->getElementType());
 953   if (result.first)
 954     result.first = Builder.CreateFPExt(result.first, ComplexElementTy, "ext");
 955   if (result.second)
 956     result.second = Builder.CreateFPExt(result.second, ComplexElementTy, "ext");
 957
 958   return result;
 959 }
 960
 961 ComplexPairTy ComplexExprEmitter::EmitPromoted(const Expr *E,
 962                                                QualType PromotionType) {
 963   E = E->IgnoreParens();
 964   if (auto BO = dyn_cast<BinaryOperator>(E)) {
 965     switch (BO->getOpcode()) {
 966 #define HANDLE_BINOP(OP)                                                       \
 967   case BO_##OP:                                                                \
 968     return EmitBin##OP(EmitBinOps(BO, PromotionType));
 969       HANDLE_BINOP(Add)
 970       HANDLE_BINOP(Sub)
 971       HANDLE_BINOP(Mul)
 972       HANDLE_BINOP(Div)
 973 #undef HANDLE_BINOP
 974     default:
 975       break;
 976     }
 977   } else if (auto UO = dyn_cast<UnaryOperator>(E)) {
 978     switch (UO->getOpcode()) {
 979     case UO_Minus:
 980       return VisitMinus(UO, PromotionType);
 981     case UO_Plus:
 982       return VisitPlus(UO, PromotionType);
 983     default:
 984       break;
 985     }
 986   }
 987   auto result = Visit(const_cast<Expr *>(E));
 988   if (!PromotionType.isNull())
 989     return CGF.EmitPromotedValue(result, PromotionType);
 990   else
 991     return result;
 992 }
 993
 994 ComplexPairTy CodeGenFunction::EmitPromotedComplexExpr(const Expr *E,
 995                                                        QualType DstTy) {
 996   return ComplexExprEmitter(*this).EmitPromoted(E, DstTy);
 997 }
 998
 999 ComplexPairTy
1000 ComplexExprEmitter::EmitPromotedComplexOperand(const Expr *E,
1001                                                QualType OverallPromotionType) {
1002   if (E->getType()->isAnyComplexType()) {
1003     if (!OverallPromotionType.isNull())
1004       return CGF.EmitPromotedComplexExpr(E, OverallPromotionType);
1005     else
1006       return Visit(const_cast<Expr *>(E));
1007   } else {
1008     if (!OverallPromotionType.isNull()) {
1009       QualType ComplexElementTy =
1010           OverallPromotionType->castAs<ComplexType>()->getElementType();
1011       return ComplexPairTy(CGF.EmitPromotedScalarExpr(E, ComplexElementTy),
1012                            nullptr);
1013     } else {
1014       return ComplexPairTy(CGF.EmitScalarExpr(E), nullptr);
1015     }
1016   }
1017 }
1018
1019 ComplexExprEmitter::BinOpInfo
1020 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E,
1021                                QualType PromotionType) {
1022   TestAndClearIgnoreReal();
1023   TestAndClearIgnoreImag();
1024   BinOpInfo Ops;
1025
1026   Ops.LHS = EmitPromotedComplexOperand(E->getLHS(), PromotionType);
1027   Ops.RHS = EmitPromotedComplexOperand(E->getRHS(), PromotionType);
1028   if (!PromotionType.isNull())
1029     Ops.Ty = PromotionType;
1030   else
1031     Ops.Ty = E->getType();
1032   Ops.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
1033   return Ops;
1034 }
1035
1036
1037 LValue ComplexExprEmitter::
1038 EmitCompoundAssignLValue(const CompoundAssignOperator *E,
1039           ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
1040                          RValue &Val) {
1041   TestAndClearIgnoreReal();
1042   TestAndClearIgnoreImag();
1043   QualType LHSTy = E->getLHS()->getType();
1044   if (const AtomicType *AT = LHSTy->getAs<AtomicType>())
1045     LHSTy = AT->getValueType();
1046
1047   BinOpInfo OpInfo;
1048   OpInfo.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
1049   CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, OpInfo.FPFeatures);
1050
1051   // Load the RHS and LHS operands.
1052   // __block variables need to have the rhs evaluated first, plus this should
1053   // improve codegen a little.
1054   QualType PromotionTypeCR;
1055   PromotionTypeCR = getPromotionType(E->getComputationResultType());
1056   if (PromotionTypeCR.isNull())
1057     PromotionTypeCR = E->getComputationResultType();
1058   OpInfo.Ty = PromotionTypeCR;
1059   QualType ComplexElementTy =
1060       OpInfo.Ty->castAs<ComplexType>()->getElementType();
1061   QualType PromotionTypeRHS = getPromotionType(E->getRHS()->getType());
1062
1063   // The RHS should have been converted to the computation type.
1064   if (E->getRHS()->getType()->isRealFloatingType()) {
1065     if (!PromotionTypeRHS.isNull())
1066       OpInfo.RHS = ComplexPairTy(
1067           CGF.EmitPromotedScalarExpr(E->getRHS(), PromotionTypeRHS), nullptr);
1068     else {
1069       assert(CGF.getContext().hasSameUnqualifiedType(ComplexElementTy,
1070                                                      E->getRHS()->getType()));
1071
1072       OpInfo.RHS = ComplexPairTy(CGF.EmitScalarExpr(E->getRHS()), nullptr);
1073     }
1074   } else {
1075     if (!PromotionTypeRHS.isNull()) {
1076       OpInfo.RHS = ComplexPairTy(
1077           CGF.EmitPromotedComplexExpr(E->getRHS(), PromotionTypeRHS));
1078     } else {
1079       assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
1080                                                      E->getRHS()->getType()));
1081       OpInfo.RHS = Visit(E->getRHS());
1082     }
1083   }
1084
1085   LValue LHS = CGF.EmitLValue(E->getLHS());
1086
1087   // Load from the l-value and convert it.
1088   SourceLocation Loc = E->getExprLoc();
1089   QualType PromotionTypeLHS = getPromotionType(E->getComputationLHSType());
1090   if (LHSTy->isAnyComplexType()) {
1091     ComplexPairTy LHSVal = EmitLoadOfLValue(LHS, Loc);
1092     if (!PromotionTypeLHS.isNull())
1093       OpInfo.LHS =
1094           EmitComplexToComplexCast(LHSVal, LHSTy, PromotionTypeLHS, Loc);
1095     else
1096       OpInfo.LHS = EmitComplexToComplexCast(LHSVal, LHSTy, OpInfo.Ty, Loc);
1097   } else {
1098     llvm::Value *LHSVal = CGF.EmitLoadOfScalar(LHS, Loc);
1099     // For floating point real operands we can directly pass the scalar form
1100     // to the binary operator emission and potentially get more efficient code.
1101     if (LHSTy->isRealFloatingType()) {
1102       QualType PromotedComplexElementTy;
1103       if (!PromotionTypeLHS.isNull()) {
1104         PromotedComplexElementTy =
1105             cast<ComplexType>(PromotionTypeLHS)->getElementType();
1106         if (!CGF.getContext().hasSameUnqualifiedType(PromotedComplexElementTy,
1107                                                      PromotionTypeLHS))
1108           LHSVal = CGF.EmitScalarConversion(LHSVal, LHSTy,
1109                                             PromotedComplexElementTy, Loc);
1110       } else {
1111         if (!CGF.getContext().hasSameUnqualifiedType(ComplexElementTy, LHSTy))
1112           LHSVal =
1113               CGF.EmitScalarConversion(LHSVal, LHSTy, ComplexElementTy, Loc);
1114       }
1115       OpInfo.LHS = ComplexPairTy(LHSVal, nullptr);
1116     } else {
1117       OpInfo.LHS = EmitScalarToComplexCast(LHSVal, LHSTy, OpInfo.Ty, Loc);
1118     }
1119   }
1120
1121   // Expand the binary operator.
1122   ComplexPairTy Result = (this->*Func)(OpInfo);
1123
1124   // Truncate the result and store it into the LHS lvalue.
1125   if (LHSTy->isAnyComplexType()) {
1126     ComplexPairTy ResVal =
1127         EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy, Loc);
1128     EmitStoreOfComplex(ResVal, LHS, /*isInit*/ false);
1129     Val = RValue::getComplex(ResVal);
1130   } else {
1131     llvm::Value *ResVal =
1132         CGF.EmitComplexToScalarConversion(Result, OpInfo.Ty, LHSTy, Loc);
1133     CGF.EmitStoreOfScalar(ResVal, LHS, /*isInit*/ false);
1134     Val = RValue::get(ResVal);
1135   }
1136
1137   return LHS;
1138 }
1139
1140 // Compound assignments.
1141 ComplexPairTy ComplexExprEmitter::
1142 EmitCompoundAssign(const CompoundAssignOperator *E,
1143                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
1144   RValue Val;
1145   LValue LV = EmitCompoundAssignLValue(E, Func, Val);
1146
1147   // The result of an assignment in C is the assigned r-value.
1148   if (!CGF.getLangOpts().CPlusPlus)
1149     return Val.getComplexVal();
1150
1151   // If the lvalue is non-volatile, return the computed value of the assignment.
1152   if (!LV.isVolatileQualified())
1153     return Val.getComplexVal();
1154
1155   return EmitLoadOfLValue(LV, E->getExprLoc());
1156 }
1157
1158 LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
1159                                                ComplexPairTy &Val) {
1160   assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
1161                                                  E->getRHS()->getType()) &&
1162          "Invalid assignment");
1163   TestAndClearIgnoreReal();
1164   TestAndClearIgnoreImag();
1165
1166   // Emit the RHS.  __block variables need the RHS evaluated first.
1167   Val = Visit(E->getRHS());
1168
1169   // Compute the address to store into.
1170   LValue LHS = CGF.EmitLValue(E->getLHS());
1171
1172   // Store the result value into the LHS lvalue.
1173   EmitStoreOfComplex(Val, LHS, /*isInit*/ false);
1174
1175   return LHS;
1176 }
1177
1178 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
1179   ComplexPairTy Val;
1180   LValue LV = EmitBinAssignLValue(E, Val);
1181
1182   // The result of an assignment in C is the assigned r-value.
1183   if (!CGF.getLangOpts().CPlusPlus)
1184     return Val;
1185
1186   // If the lvalue is non-volatile, return the computed value of the assignment.
1187   if (!LV.isVolatileQualified())
1188     return Val;
1189
1190   return EmitLoadOfLValue(LV, E->getExprLoc());
1191 }
1192
1193 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
1194   CGF.EmitIgnoredExpr(E->getLHS());
1195   return Visit(E->getRHS());
1196 }
1197
1198 ComplexPairTy ComplexExprEmitter::
1199 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
1200   TestAndClearIgnoreReal();
1201   TestAndClearIgnoreImag();
1202   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
1203   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
1204   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
1205
1206   // Bind the common expression if necessary.
1207   CodeGenFunction::OpaqueValueMapping binding(CGF, E);
1208
1209
1210   CodeGenFunction::ConditionalEvaluation eval(CGF);
1211   CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock,
1212                            CGF.getProfileCount(E));
1213
1214   eval.begin(CGF);
1215   CGF.EmitBlock(LHSBlock);
1216   CGF.incrementProfileCounter(E);
1217   ComplexPairTy LHS = Visit(E->getTrueExpr());
1218   LHSBlock = Builder.GetInsertBlock();
1219   CGF.EmitBranch(ContBlock);
1220   eval.end(CGF);
1221
1222   eval.begin(CGF);
1223   CGF.EmitBlock(RHSBlock);
1224   ComplexPairTy RHS = Visit(E->getFalseExpr());
1225   RHSBlock = Builder.GetInsertBlock();
1226   CGF.EmitBlock(ContBlock);
1227   eval.end(CGF);
1228
1229   // Create a PHI node for the real part.
1230   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
1231   RealPN->addIncoming(LHS.first, LHSBlock);
1232   RealPN->addIncoming(RHS.first, RHSBlock);
1233
1234   // Create a PHI node for the imaginary part.
1235   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
1236   ImagPN->addIncoming(LHS.second, LHSBlock);
1237   ImagPN->addIncoming(RHS.second, RHSBlock);
1238
1239   return ComplexPairTy(RealPN, ImagPN);
1240 }
1241
1242 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
1243   return Visit(E->getChosenSubExpr());
1244 }
1245
1246 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
1247     bool Ignore = TestAndClearIgnoreReal();
1248     (void)Ignore;
1249     assert (Ignore == false && "init list ignored");
1250     Ignore = TestAndClearIgnoreImag();
1251     (void)Ignore;
1252     assert (Ignore == false && "init list ignored");
1253
1254   if (E->getNumInits() == 2) {
1255     llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
1256     llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
1257     return ComplexPairTy(Real, Imag);
1258   } else if (E->getNumInits() == 1) {
1259     return Visit(E->getInit(0));
1260   }
1261
1262   // Empty init list initializes to null
1263   assert(E->getNumInits() == 0 && "Unexpected number of inits");
1264   QualType Ty = E->getType()->castAs<ComplexType>()->getElementType();
1265   llvm::Type* LTy = CGF.ConvertType(Ty);
1266   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
1267   return ComplexPairTy(zeroConstant, zeroConstant);
1268 }
1269
1270 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
1271   Address ArgValue = Address::invalid();
1272   Address ArgPtr = CGF.EmitVAArg(E, ArgValue);
1273
1274   if (!ArgPtr.isValid()) {
1275     CGF.ErrorUnsupported(E, "complex va_arg expression");
1276     llvm::Type *EltTy =
1277       CGF.ConvertType(E->getType()->castAs<ComplexType>()->getElementType());
1278     llvm::Value *U = llvm::UndefValue::get(EltTy);
1279     return ComplexPairTy(U, U);
1280   }
1281
1282   return EmitLoadOfLValue(CGF.MakeAddrLValue(ArgPtr, E->getType()),
1283                           E->getExprLoc());
1284 }
1285
1286 //===----------------------------------------------------------------------===//
1287 //                         Entry Point into this File
1288 //===----------------------------------------------------------------------===//
1289
1290 /// EmitComplexExpr - Emit the computation of the specified expression of
1291 /// complex type, ignoring the result.
1292 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
1293                                                bool IgnoreImag) {
1294   assert(E && getComplexType(E->getType()) &&
1295          "Invalid complex expression to emit");
1296
1297   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
1298       .Visit(const_cast<Expr *>(E));
1299 }
1300
1301 void CodeGenFunction::EmitComplexExprIntoLValue(const Expr *E, LValue dest,
1302                                                 bool isInit) {
1303   assert(E && getComplexType(E->getType()) &&
1304          "Invalid complex expression to emit");
1305   ComplexExprEmitter Emitter(*this);
1306   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
1307   Emitter.EmitStoreOfComplex(Val, dest, isInit);
1308 }
1309
1310 /// EmitStoreOfComplex - Store a complex number into the specified l-value.
1311 void CodeGenFunction::EmitStoreOfComplex(ComplexPairTy V, LValue dest,
1312                                          bool isInit) {
1313   ComplexExprEmitter(*this).EmitStoreOfComplex(V, dest, isInit);
1314 }
1315
1316 /// EmitLoadOfComplex - Load a complex number from the specified address.
1317 ComplexPairTy CodeGenFunction::EmitLoadOfComplex(LValue src,
1318                                                  SourceLocation loc) {
1319   return ComplexExprEmitter(*this).EmitLoadOfLValue(src, loc);
1320 }
1321
1322 LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
1323   assert(E->getOpcode() == BO_Assign);
1324   ComplexPairTy Val; // ignored
1325   LValue LVal = ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
1326   if (getLangOpts().OpenMP)
1327     CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
1328                                                               E->getLHS());
1329   return LVal;
1330 }
1331
1332 typedef ComplexPairTy (ComplexExprEmitter::*CompoundFunc)(
1333     const ComplexExprEmitter::BinOpInfo &);
1334
1335 static CompoundFunc getComplexOp(BinaryOperatorKind Op) {
1336   switch (Op) {
1337   case BO_MulAssign: return &ComplexExprEmitter::EmitBinMul;
1338   case BO_DivAssign: return &ComplexExprEmitter::EmitBinDiv;
1339   case BO_SubAssign: return &ComplexExprEmitter::EmitBinSub;
1340   case BO_AddAssign: return &ComplexExprEmitter::EmitBinAdd;
1341   default:
1342     llvm_unreachable("unexpected complex compound assignment");
1343   }
1344 }
1345
1346 LValue CodeGenFunction::
1347 EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
1348   CompoundFunc Op = getComplexOp(E->getOpcode());
1349   RValue Val;
1350   return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
1351 }
1352
1353 LValue CodeGenFunction::
1354 EmitScalarCompoundAssignWithComplex(const CompoundAssignOperator *E,
1355                                     llvm::Value *&Result) {
1356   CompoundFunc Op = getComplexOp(E->getOpcode());
1357   RValue Val;
1358   LValue Ret = ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
1359   Result = Val.getScalarVal();
1360   return Ret;
1361 }