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