1 //===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This contains code to emit Expr nodes with complex types as LLVM code.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CodeGenFunction.h"
15 #include "CodeGenModule.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/StmtVisitor.h"
18 #include "llvm/Constants.h"
19 #include "llvm/Function.h"
20 #include "llvm/ADT/SmallString.h"
21 using namespace clang;
22 using namespace CodeGen;
23 
24 //===----------------------------------------------------------------------===//
25 //                        Complex Expression Emitter
26 //===----------------------------------------------------------------------===//
27 
28 typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
29 
30 namespace  {
31 class ComplexExprEmitter
32   : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
33   CodeGenFunction &CGF;
34   CGBuilderTy &Builder;
35   // True is we should ignore the value of a
36   bool IgnoreReal;
37   bool IgnoreImag;
38   // True if we should ignore the value of a=b
39   bool IgnoreRealAssign;
40   bool IgnoreImagAssign;
41 public:
42   ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false,
43                      bool irn=false, bool iin=false)
44     : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii),
45     IgnoreRealAssign(irn), IgnoreImagAssign(iin) {
46   }
47 
48 
49   //===--------------------------------------------------------------------===//
50   //                               Utilities
51   //===--------------------------------------------------------------------===//
52 
53   bool TestAndClearIgnoreReal() {
54     bool I = IgnoreReal;
55     IgnoreReal = false;
56     return I;
57   }
58   bool TestAndClearIgnoreImag() {
59     bool I = IgnoreImag;
60     IgnoreImag = false;
61     return I;
62   }
63   bool TestAndClearIgnoreRealAssign() {
64     bool I = IgnoreRealAssign;
65     IgnoreRealAssign = false;
66     return I;
67   }
68   bool TestAndClearIgnoreImagAssign() {
69     bool I = IgnoreImagAssign;
70     IgnoreImagAssign = false;
71     return I;
72   }
73 
74   /// EmitLoadOfLValue - Given an expression with complex type that represents a
75   /// value l-value, this method emits the address of the l-value, then loads
76   /// and returns the result.
77   ComplexPairTy EmitLoadOfLValue(const Expr *E) {
78     LValue LV = CGF.EmitLValue(E);
79     if (LV.isSimple())
80       return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
81 
82     if (LV.isPropertyRef())
83       return CGF.EmitObjCPropertyGet(LV.getPropertyRefExpr()).getComplexVal();
84 
85     assert(LV.isKVCRef() && "Unknown LValue type!");
86     return CGF.EmitObjCPropertyGet(LV.getKVCRefExpr()).getComplexVal();
87   }
88 
89   /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
90   /// the real and imaginary pieces.
91   ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
92 
93   /// EmitStoreOfComplex - Store the specified real/imag parts into the
94   /// specified value pointer.
95   void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
96 
97   /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
98   ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
99                                          QualType DestType);
100 
101   //===--------------------------------------------------------------------===//
102   //                            Visitor Methods
103   //===--------------------------------------------------------------------===//
104 
105   ComplexPairTy VisitStmt(Stmt *S) {
106     S->dump(CGF.getContext().getSourceManager());
107     assert(0 && "Stmt can't have complex result type!");
108     return ComplexPairTy();
109   }
110   ComplexPairTy VisitExpr(Expr *S);
111   ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
112   ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
113 
114   // l-values.
115   ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
116   ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
117     return EmitLoadOfLValue(E);
118   }
119   ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
120     return EmitLoadOfLValue(E);
121   }
122   ComplexPairTy VisitObjCImplicitSetterGetterRefExpr(
123                                ObjCImplicitSetterGetterRefExpr *E) {
124     return EmitLoadOfLValue(E);
125   }
126   ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
127     return CGF.EmitObjCMessageExpr(E).getComplexVal();
128   }
129   ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
130   ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
131 
132   // FIXME: CompoundLiteralExpr
133 
134   ComplexPairTy EmitCast(Expr *Op, QualType DestTy);
135   ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
136     // Unlike for scalars, we don't have to worry about function->ptr demotion
137     // here.
138     return EmitCast(E->getSubExpr(), E->getType());
139   }
140   ComplexPairTy VisitCastExpr(CastExpr *E) {
141     return EmitCast(E->getSubExpr(), E->getType());
142   }
143   ComplexPairTy VisitCallExpr(const CallExpr *E);
144   ComplexPairTy VisitStmtExpr(const StmtExpr *E);
145 
146   // Operators.
147   ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
148                                    bool isInc, bool isPre) {
149     LValue LV = CGF.EmitLValue(E->getSubExpr());
150     return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
151   }
152   ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
153     return VisitPrePostIncDec(E, false, false);
154   }
155   ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
156     return VisitPrePostIncDec(E, true, false);
157   }
158   ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
159     return VisitPrePostIncDec(E, false, true);
160   }
161   ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
162     return VisitPrePostIncDec(E, true, true);
163   }
164   ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
165   ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
166     TestAndClearIgnoreReal();
167     TestAndClearIgnoreImag();
168     TestAndClearIgnoreRealAssign();
169     TestAndClearIgnoreImagAssign();
170     return Visit(E->getSubExpr());
171   }
172   ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
173   ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
174   // LNot,Real,Imag never return complex.
175   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
176     return Visit(E->getSubExpr());
177   }
178   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
179     return Visit(DAE->getExpr());
180   }
181   ComplexPairTy VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
182     return CGF.EmitCXXExprWithTemporaries(E).getComplexVal();
183   }
184   ComplexPairTy VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
185     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
186     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
187     llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
188     return ComplexPairTy(Null, Null);
189   }
190   ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
191     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
192     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
193     llvm::Constant *Null =
194                        llvm::Constant::getNullValue(CGF.ConvertType(Elem));
195     return ComplexPairTy(Null, Null);
196   }
197 
198   struct BinOpInfo {
199     ComplexPairTy LHS;
200     ComplexPairTy RHS;
201     QualType Ty;  // Computation Type.
202   };
203 
204   BinOpInfo EmitBinOps(const BinaryOperator *E);
205   ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
206                                    ComplexPairTy (ComplexExprEmitter::*Func)
207                                    (const BinOpInfo &));
208 
209   ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
210   ComplexPairTy EmitBinSub(const BinOpInfo &Op);
211   ComplexPairTy EmitBinMul(const BinOpInfo &Op);
212   ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
213 
214   ComplexPairTy VisitBinMul(const BinaryOperator *E) {
215     return EmitBinMul(EmitBinOps(E));
216   }
217   ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
218     return EmitBinAdd(EmitBinOps(E));
219   }
220   ComplexPairTy VisitBinSub(const BinaryOperator *E) {
221     return EmitBinSub(EmitBinOps(E));
222   }
223   ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
224     return EmitBinDiv(EmitBinOps(E));
225   }
226 
227   // Compound assignments.
228   ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
229     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
230   }
231   ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
232     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
233   }
234   ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
235     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
236   }
237   ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
238     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
239   }
240 
241   // GCC rejects rem/and/or/xor for integer complex.
242   // Logical and/or always return int, never complex.
243 
244   // No comparisons produce a complex result.
245   ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
246   ComplexPairTy VisitBinComma      (const BinaryOperator *E);
247 
248 
249   ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
250   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
251 
252   ComplexPairTy VisitInitListExpr(InitListExpr *E);
253 
254   ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
255 };
256 }  // end anonymous namespace.
257 
258 //===----------------------------------------------------------------------===//
259 //                                Utilities
260 //===----------------------------------------------------------------------===//
261 
262 /// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
263 /// load the real and imaginary pieces, returning them as Real/Imag.
264 ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
265                                                     bool isVolatile) {
266   llvm::Value *Real=0, *Imag=0;
267 
268   if (!IgnoreReal) {
269     llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
270                                                  SrcPtr->getName() + ".realp");
271     Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
272   }
273 
274   if (!IgnoreImag) {
275     llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
276                                                  SrcPtr->getName() + ".imagp");
277     Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
278   }
279   return ComplexPairTy(Real, Imag);
280 }
281 
282 /// EmitStoreOfComplex - Store the specified real/imag parts into the
283 /// specified value pointer.
284 void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
285                                             bool isVolatile) {
286   llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
287   llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
288 
289   Builder.CreateStore(Val.first, RealPtr, isVolatile);
290   Builder.CreateStore(Val.second, ImagPtr, isVolatile);
291 }
292 
293 
294 
295 //===----------------------------------------------------------------------===//
296 //                            Visitor Methods
297 //===----------------------------------------------------------------------===//
298 
299 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
300   CGF.ErrorUnsupported(E, "complex expression");
301   const llvm::Type *EltTy =
302     CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
303   llvm::Value *U = llvm::UndefValue::get(EltTy);
304   return ComplexPairTy(U, U);
305 }
306 
307 ComplexPairTy ComplexExprEmitter::
308 VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
309   llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
310   return
311         ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
312 }
313 
314 
315 ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
316   if (E->getCallReturnType()->isReferenceType())
317     return EmitLoadOfLValue(E);
318 
319   return CGF.EmitCallExpr(E).getComplexVal();
320 }
321 
322 ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
323   return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
324 }
325 
326 /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
327 ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
328                                                            QualType SrcType,
329                                                            QualType DestType) {
330   // Get the src/dest element type.
331   SrcType = SrcType->getAs<ComplexType>()->getElementType();
332   DestType = DestType->getAs<ComplexType>()->getElementType();
333 
334   // C99 6.3.1.6: When a value of complex type is converted to another
335   // complex type, both the real and imaginary parts follow the conversion
336   // rules for the corresponding real types.
337   Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
338   Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
339   return Val;
340 }
341 
342 ComplexPairTy ComplexExprEmitter::EmitCast(Expr *Op, QualType DestTy) {
343   // Two cases here: cast from (complex to complex) and (scalar to complex).
344   if (Op->getType()->isAnyComplexType())
345     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
346 
347   // C99 6.3.1.7: When a value of real type is converted to a complex type, the
348   // real part of the complex result value is determined by the rules of
349   // conversion to the corresponding real type and the imaginary part of the
350   // complex result value is a positive zero or an unsigned zero.
351   llvm::Value *Elt = CGF.EmitScalarExpr(Op);
352 
353   // Convert the input element to the element type of the complex.
354   DestTy = DestTy->getAs<ComplexType>()->getElementType();
355   Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
356 
357   // Return (realval, 0).
358   return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
359 }
360 
361 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
362   TestAndClearIgnoreReal();
363   TestAndClearIgnoreImag();
364   TestAndClearIgnoreRealAssign();
365   TestAndClearIgnoreImagAssign();
366   ComplexPairTy Op = Visit(E->getSubExpr());
367 
368   llvm::Value *ResR, *ResI;
369   if (Op.first->getType()->isFloatingPoint()) {
370     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
371     ResI = Builder.CreateFNeg(Op.second, "neg.i");
372   } else {
373     ResR = Builder.CreateNeg(Op.first,  "neg.r");
374     ResI = Builder.CreateNeg(Op.second, "neg.i");
375   }
376   return ComplexPairTy(ResR, ResI);
377 }
378 
379 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
380   TestAndClearIgnoreReal();
381   TestAndClearIgnoreImag();
382   TestAndClearIgnoreRealAssign();
383   TestAndClearIgnoreImagAssign();
384   // ~(a+ib) = a + i*-b
385   ComplexPairTy Op = Visit(E->getSubExpr());
386   llvm::Value *ResI;
387   if (Op.second->getType()->isFloatingPoint())
388     ResI = Builder.CreateFNeg(Op.second, "conj.i");
389   else
390     ResI = Builder.CreateNeg(Op.second, "conj.i");
391 
392   return ComplexPairTy(Op.first, ResI);
393 }
394 
395 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
396   llvm::Value *ResR, *ResI;
397 
398   if (Op.LHS.first->getType()->isFloatingPoint()) {
399     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
400     ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
401   } else {
402     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
403     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
404   }
405   return ComplexPairTy(ResR, ResI);
406 }
407 
408 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
409   llvm::Value *ResR, *ResI;
410   if (Op.LHS.first->getType()->isFloatingPoint()) {
411     ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
412     ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
413   } else {
414     ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
415     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
416   }
417   return ComplexPairTy(ResR, ResI);
418 }
419 
420 
421 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
422   using llvm::Value;
423   Value *ResR, *ResI;
424 
425   if (Op.LHS.first->getType()->isFloatingPoint()) {
426     Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
427     Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
428     ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
429 
430     Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
431     Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
432     ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
433   } else {
434     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
435     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
436     ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
437 
438     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
439     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
440     ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
441   }
442   return ComplexPairTy(ResR, ResI);
443 }
444 
445 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
446   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
447   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
448 
449 
450   llvm::Value *DSTr, *DSTi;
451   if (Op.LHS.first->getType()->isFloatingPoint()) {
452     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
453     llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
454     llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
455     llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
456 
457     llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
458     llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
459     llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
460 
461     llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
462     llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
463     llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
464 
465     DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
466     DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
467   } else {
468     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
469     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
470     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
471     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
472 
473     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
474     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
475     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
476 
477     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
478     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
479     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
480 
481     if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
482       DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
483       DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
484     } else {
485       DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
486       DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
487     }
488   }
489 
490   return ComplexPairTy(DSTr, DSTi);
491 }
492 
493 ComplexExprEmitter::BinOpInfo
494 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
495   TestAndClearIgnoreReal();
496   TestAndClearIgnoreImag();
497   TestAndClearIgnoreRealAssign();
498   TestAndClearIgnoreImagAssign();
499   BinOpInfo Ops;
500   Ops.LHS = Visit(E->getLHS());
501   Ops.RHS = Visit(E->getRHS());
502   Ops.Ty = E->getType();
503   return Ops;
504 }
505 
506 
507 // Compound assignments.
508 ComplexPairTy ComplexExprEmitter::
509 EmitCompoundAssign(const CompoundAssignOperator *E,
510                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
511   TestAndClearIgnoreReal();
512   TestAndClearIgnoreImag();
513   bool ignreal = TestAndClearIgnoreRealAssign();
514   bool ignimag = TestAndClearIgnoreImagAssign();
515   QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType();
516 
517   BinOpInfo OpInfo;
518 
519   // Load the RHS and LHS operands.
520   // __block variables need to have the rhs evaluated first, plus this should
521   // improve codegen a little.  It is possible for the RHS to be complex or
522   // scalar.
523   OpInfo.Ty = E->getComputationResultType();
524   OpInfo.RHS = EmitCast(E->getRHS(), OpInfo.Ty);
525 
526   LValue LHSLV = CGF.EmitLValue(E->getLHS());
527 
528 
529   // We know the LHS is a complex lvalue.
530   OpInfo.LHS=EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
531   OpInfo.LHS=EmitComplexToComplexCast(OpInfo.LHS, LHSTy, OpInfo.Ty);
532 
533   // Expand the binary operator.
534   ComplexPairTy Result = (this->*Func)(OpInfo);
535 
536   // Truncate the result back to the LHS type.
537   Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
538 
539   // Store the result value into the LHS lvalue.
540   EmitStoreOfComplex(Result, LHSLV.getAddress(), LHSLV.isVolatileQualified());
541   // And now return the LHS
542   IgnoreReal = ignreal;
543   IgnoreImag = ignimag;
544   IgnoreRealAssign = ignreal;
545   IgnoreImagAssign = ignimag;
546   return EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
547 }
548 
549 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
550   TestAndClearIgnoreReal();
551   TestAndClearIgnoreImag();
552   bool ignreal = TestAndClearIgnoreRealAssign();
553   bool ignimag = TestAndClearIgnoreImagAssign();
554   assert(CGF.getContext().getCanonicalType(E->getLHS()->getType()) ==
555          CGF.getContext().getCanonicalType(E->getRHS()->getType()) &&
556          "Invalid assignment");
557   // Emit the RHS.
558   ComplexPairTy Val = Visit(E->getRHS());
559 
560   // Compute the address to store into.
561   LValue LHS = CGF.EmitLValue(E->getLHS());
562 
563   // Store into it, if simple.
564   if (LHS.isSimple()) {
565     EmitStoreOfComplex(Val, LHS.getAddress(), LHS.isVolatileQualified());
566 
567     // And now return the LHS
568     IgnoreReal = ignreal;
569     IgnoreImag = ignimag;
570     IgnoreRealAssign = ignreal;
571     IgnoreImagAssign = ignimag;
572     return EmitLoadOfComplex(LHS.getAddress(), LHS.isVolatileQualified());
573   }
574 
575   // Otherwise we must have a property setter (no complex vector/bitfields).
576   if (LHS.isPropertyRef())
577     CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), RValue::getComplex(Val));
578   else
579     CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Val));
580 
581   // There is no reload after a store through a method, but we need to restore
582   // the Ignore* flags.
583   IgnoreReal = ignreal;
584   IgnoreImag = ignimag;
585   IgnoreRealAssign = ignreal;
586   IgnoreImagAssign = ignimag;
587   return Val;
588 }
589 
590 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
591   CGF.EmitStmt(E->getLHS());
592   CGF.EnsureInsertPoint();
593   return Visit(E->getRHS());
594 }
595 
596 ComplexPairTy ComplexExprEmitter::
597 VisitConditionalOperator(const ConditionalOperator *E) {
598   if (!E->getLHS()) {
599     CGF.ErrorUnsupported(E, "conditional operator with missing LHS");
600     const llvm::Type *EltTy =
601       CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
602     llvm::Value *U = llvm::UndefValue::get(EltTy);
603     return ComplexPairTy(U, U);
604   }
605 
606   TestAndClearIgnoreReal();
607   TestAndClearIgnoreImag();
608   TestAndClearIgnoreRealAssign();
609   TestAndClearIgnoreImagAssign();
610   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
611   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
612   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
613 
614   CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
615 
616   CGF.EmitBlock(LHSBlock);
617 
618   // Handle the GNU extension for missing LHS.
619   assert(E->getLHS() && "Must have LHS for complex value");
620 
621   ComplexPairTy LHS = Visit(E->getLHS());
622   LHSBlock = Builder.GetInsertBlock();
623   CGF.EmitBranch(ContBlock);
624 
625   CGF.EmitBlock(RHSBlock);
626 
627   ComplexPairTy RHS = Visit(E->getRHS());
628   RHSBlock = Builder.GetInsertBlock();
629   CGF.EmitBranch(ContBlock);
630 
631   CGF.EmitBlock(ContBlock);
632 
633   // Create a PHI node for the real part.
634   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
635   RealPN->reserveOperandSpace(2);
636   RealPN->addIncoming(LHS.first, LHSBlock);
637   RealPN->addIncoming(RHS.first, RHSBlock);
638 
639   // Create a PHI node for the imaginary part.
640   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
641   ImagPN->reserveOperandSpace(2);
642   ImagPN->addIncoming(LHS.second, LHSBlock);
643   ImagPN->addIncoming(RHS.second, RHSBlock);
644 
645   return ComplexPairTy(RealPN, ImagPN);
646 }
647 
648 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
649   return Visit(E->getChosenSubExpr(CGF.getContext()));
650 }
651 
652 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
653     bool Ignore = TestAndClearIgnoreReal();
654     (void)Ignore;
655     assert (Ignore == false && "init list ignored");
656     Ignore = TestAndClearIgnoreImag();
657     (void)Ignore;
658     assert (Ignore == false && "init list ignored");
659   if (E->getNumInits())
660     return Visit(E->getInit(0));
661 
662   // Empty init list intializes to null
663   QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
664   const llvm::Type* LTy = CGF.ConvertType(Ty);
665   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
666   return ComplexPairTy(zeroConstant, zeroConstant);
667 }
668 
669 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
670   llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
671   llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
672 
673   if (!ArgPtr) {
674     CGF.ErrorUnsupported(E, "complex va_arg expression");
675     const llvm::Type *EltTy =
676       CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
677     llvm::Value *U = llvm::UndefValue::get(EltTy);
678     return ComplexPairTy(U, U);
679   }
680 
681   // FIXME Volatility.
682   return EmitLoadOfComplex(ArgPtr, false);
683 }
684 
685 //===----------------------------------------------------------------------===//
686 //                         Entry Point into this File
687 //===----------------------------------------------------------------------===//
688 
689 /// EmitComplexExpr - Emit the computation of the specified expression of
690 /// complex type, ignoring the result.
691 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
692                                                bool IgnoreImag, bool IgnoreRealAssign, bool IgnoreImagAssign) {
693   assert(E && E->getType()->isAnyComplexType() &&
694          "Invalid complex expression to emit");
695 
696   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag, IgnoreRealAssign,
697                             IgnoreImagAssign)
698     .Visit(const_cast<Expr*>(E));
699 }
700 
701 /// EmitComplexExprIntoAddr - Emit the computation of the specified expression
702 /// of complex type, storing into the specified Value*.
703 void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
704                                               llvm::Value *DestAddr,
705                                               bool DestIsVolatile) {
706   assert(E && E->getType()->isAnyComplexType() &&
707          "Invalid complex expression to emit");
708   ComplexExprEmitter Emitter(*this);
709   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
710   Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
711 }
712 
713 /// StoreComplexToAddr - Store a complex number into the specified address.
714 void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
715                                          llvm::Value *DestAddr,
716                                          bool DestIsVolatile) {
717   ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
718 }
719 
720 /// LoadComplexFromAddr - Load a complex number from the specified address.
721 ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
722                                                    bool SrcIsVolatile) {
723   return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
724 }
725