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   ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
150     return VisitPrePostIncDec(E, false, false);
151   }
152   ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
153     return VisitPrePostIncDec(E, true, false);
154   }
155   ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
156     return VisitPrePostIncDec(E, false, true);
157   }
158   ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
159     return VisitPrePostIncDec(E, true, true);
160   }
161   ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
162   ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
163     TestAndClearIgnoreReal();
164     TestAndClearIgnoreImag();
165     TestAndClearIgnoreRealAssign();
166     TestAndClearIgnoreImagAssign();
167     return Visit(E->getSubExpr());
168   }
169   ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
170   ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
171   // LNot,Real,Imag never return complex.
172   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
173     return Visit(E->getSubExpr());
174   }
175   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
176     return Visit(DAE->getExpr());
177   }
178   ComplexPairTy VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
179     return CGF.EmitCXXExprWithTemporaries(E).getComplexVal();
180   }
181   ComplexPairTy VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
182     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
183     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
184     llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
185     return ComplexPairTy(Null, Null);
186   }
187   ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
188     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
189     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
190     llvm::Constant *Null =
191                        llvm::Constant::getNullValue(CGF.ConvertType(Elem));
192     return ComplexPairTy(Null, Null);
193   }
194 
195   struct BinOpInfo {
196     ComplexPairTy LHS;
197     ComplexPairTy RHS;
198     QualType Ty;  // Computation Type.
199   };
200 
201   BinOpInfo EmitBinOps(const BinaryOperator *E);
202   ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
203                                    ComplexPairTy (ComplexExprEmitter::*Func)
204                                    (const BinOpInfo &));
205 
206   ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
207   ComplexPairTy EmitBinSub(const BinOpInfo &Op);
208   ComplexPairTy EmitBinMul(const BinOpInfo &Op);
209   ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
210 
211   ComplexPairTy VisitBinMul(const BinaryOperator *E) {
212     return EmitBinMul(EmitBinOps(E));
213   }
214   ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
215     return EmitBinAdd(EmitBinOps(E));
216   }
217   ComplexPairTy VisitBinSub(const BinaryOperator *E) {
218     return EmitBinSub(EmitBinOps(E));
219   }
220   ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
221     return EmitBinDiv(EmitBinOps(E));
222   }
223 
224   // Compound assignments.
225   ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
226     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
227   }
228   ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
229     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
230   }
231   ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
232     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
233   }
234   ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
235     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
236   }
237 
238   // GCC rejects rem/and/or/xor for integer complex.
239   // Logical and/or always return int, never complex.
240 
241   // No comparisons produce a complex result.
242   ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
243   ComplexPairTy VisitBinComma      (const BinaryOperator *E);
244 
245 
246   ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
247   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
248 
249   ComplexPairTy VisitInitListExpr(InitListExpr *E);
250 
251   ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
252 };
253 }  // end anonymous namespace.
254 
255 //===----------------------------------------------------------------------===//
256 //                                Utilities
257 //===----------------------------------------------------------------------===//
258 
259 /// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
260 /// load the real and imaginary pieces, returning them as Real/Imag.
261 ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
262                                                     bool isVolatile) {
263   llvm::Value *Real=0, *Imag=0;
264 
265   if (!IgnoreReal) {
266     llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
267                                                  SrcPtr->getName() + ".realp");
268     Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
269   }
270 
271   if (!IgnoreImag) {
272     llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
273                                                  SrcPtr->getName() + ".imagp");
274     Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
275   }
276   return ComplexPairTy(Real, Imag);
277 }
278 
279 /// EmitStoreOfComplex - Store the specified real/imag parts into the
280 /// specified value pointer.
281 void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
282                                             bool isVolatile) {
283   llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
284   llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
285 
286   Builder.CreateStore(Val.first, RealPtr, isVolatile);
287   Builder.CreateStore(Val.second, ImagPtr, isVolatile);
288 }
289 
290 
291 
292 //===----------------------------------------------------------------------===//
293 //                            Visitor Methods
294 //===----------------------------------------------------------------------===//
295 
296 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
297   CGF.ErrorUnsupported(E, "complex expression");
298   const llvm::Type *EltTy =
299     CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
300   llvm::Value *U = llvm::UndefValue::get(EltTy);
301   return ComplexPairTy(U, U);
302 }
303 
304 ComplexPairTy ComplexExprEmitter::
305 VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
306   llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
307   return
308         ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
309 }
310 
311 
312 ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
313   if (E->getCallReturnType()->isReferenceType())
314     return EmitLoadOfLValue(E);
315 
316   return CGF.EmitCallExpr(E).getComplexVal();
317 }
318 
319 ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
320   return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
321 }
322 
323 /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
324 ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
325                                                            QualType SrcType,
326                                                            QualType DestType) {
327   // Get the src/dest element type.
328   SrcType = SrcType->getAs<ComplexType>()->getElementType();
329   DestType = DestType->getAs<ComplexType>()->getElementType();
330 
331   // C99 6.3.1.6: When a value of complex type is converted to another
332   // complex type, both the real and imaginary parts follow the conversion
333   // rules for the corresponding real types.
334   Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
335   Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
336   return Val;
337 }
338 
339 ComplexPairTy ComplexExprEmitter::EmitCast(Expr *Op, QualType DestTy) {
340   // Two cases here: cast from (complex to complex) and (scalar to complex).
341   if (Op->getType()->isAnyComplexType())
342     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
343 
344   // C99 6.3.1.7: When a value of real type is converted to a complex type, the
345   // real part of the complex result value is determined by the rules of
346   // conversion to the corresponding real type and the imaginary part of the
347   // complex result value is a positive zero or an unsigned zero.
348   llvm::Value *Elt = CGF.EmitScalarExpr(Op);
349 
350   // Convert the input element to the element type of the complex.
351   DestTy = DestTy->getAs<ComplexType>()->getElementType();
352   Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
353 
354   // Return (realval, 0).
355   return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
356 }
357 
358 ComplexPairTy ComplexExprEmitter::VisitPrePostIncDec(const UnaryOperator *E,
359                                                      bool isInc, bool isPre) {
360   LValue LV = CGF.EmitLValue(E->getSubExpr());
361   ComplexPairTy InVal = EmitLoadOfComplex(LV.getAddress(),
362                                           LV.isVolatileQualified());
363 
364   llvm::Value *NextVal;
365   if (isa<llvm::IntegerType>(InVal.first->getType())) {
366     uint64_t AmountVal = isInc ? 1 : -1;
367     NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
368 
369     // Add the inc/dec to the real part.
370     NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
371   } else {
372     QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
373     llvm::APFloat FVal(CGF.getContext().getFloatTypeSemantics(ElemTy), 1);
374     if (!isInc)
375       FVal.changeSign();
376     NextVal = llvm::ConstantFP::get(CGF.getLLVMContext(), FVal);
377 
378     // Add the inc/dec to the real part.
379     NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
380   }
381 
382   ComplexPairTy IncVal(NextVal, InVal.second);
383 
384   // Store the updated result through the lvalue.
385   EmitStoreOfComplex(IncVal, LV.getAddress(), LV.isVolatileQualified());
386 
387   // If this is a postinc, return the value read from memory, otherwise use the
388   // updated value.
389   return isPre ? IncVal : InVal;
390 }
391 
392 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
393   TestAndClearIgnoreReal();
394   TestAndClearIgnoreImag();
395   TestAndClearIgnoreRealAssign();
396   TestAndClearIgnoreImagAssign();
397   ComplexPairTy Op = Visit(E->getSubExpr());
398 
399   llvm::Value *ResR, *ResI;
400   if (Op.first->getType()->isFloatingPoint()) {
401     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
402     ResI = Builder.CreateFNeg(Op.second, "neg.i");
403   } else {
404     ResR = Builder.CreateNeg(Op.first,  "neg.r");
405     ResI = Builder.CreateNeg(Op.second, "neg.i");
406   }
407   return ComplexPairTy(ResR, ResI);
408 }
409 
410 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
411   TestAndClearIgnoreReal();
412   TestAndClearIgnoreImag();
413   TestAndClearIgnoreRealAssign();
414   TestAndClearIgnoreImagAssign();
415   // ~(a+ib) = a + i*-b
416   ComplexPairTy Op = Visit(E->getSubExpr());
417   llvm::Value *ResI;
418   if (Op.second->getType()->isFloatingPoint())
419     ResI = Builder.CreateFNeg(Op.second, "conj.i");
420   else
421     ResI = Builder.CreateNeg(Op.second, "conj.i");
422 
423   return ComplexPairTy(Op.first, ResI);
424 }
425 
426 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
427   llvm::Value *ResR, *ResI;
428 
429   if (Op.LHS.first->getType()->isFloatingPoint()) {
430     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
431     ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
432   } else {
433     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
434     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
435   }
436   return ComplexPairTy(ResR, ResI);
437 }
438 
439 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
440   llvm::Value *ResR, *ResI;
441   if (Op.LHS.first->getType()->isFloatingPoint()) {
442     ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
443     ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
444   } else {
445     ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
446     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
447   }
448   return ComplexPairTy(ResR, ResI);
449 }
450 
451 
452 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
453   using llvm::Value;
454   Value *ResR, *ResI;
455 
456   if (Op.LHS.first->getType()->isFloatingPoint()) {
457     Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
458     Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
459     ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
460 
461     Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
462     Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
463     ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
464   } else {
465     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
466     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
467     ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
468 
469     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
470     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
471     ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
472   }
473   return ComplexPairTy(ResR, ResI);
474 }
475 
476 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
477   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
478   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
479 
480 
481   llvm::Value *DSTr, *DSTi;
482   if (Op.LHS.first->getType()->isFloatingPoint()) {
483     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
484     llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
485     llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
486     llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
487 
488     llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
489     llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
490     llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
491 
492     llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
493     llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
494     llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
495 
496     DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
497     DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
498   } else {
499     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
500     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
501     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
502     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
503 
504     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
505     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
506     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
507 
508     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
509     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
510     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
511 
512     if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
513       DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
514       DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
515     } else {
516       DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
517       DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
518     }
519   }
520 
521   return ComplexPairTy(DSTr, DSTi);
522 }
523 
524 ComplexExprEmitter::BinOpInfo
525 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
526   TestAndClearIgnoreReal();
527   TestAndClearIgnoreImag();
528   TestAndClearIgnoreRealAssign();
529   TestAndClearIgnoreImagAssign();
530   BinOpInfo Ops;
531   Ops.LHS = Visit(E->getLHS());
532   Ops.RHS = Visit(E->getRHS());
533   Ops.Ty = E->getType();
534   return Ops;
535 }
536 
537 
538 // Compound assignments.
539 ComplexPairTy ComplexExprEmitter::
540 EmitCompoundAssign(const CompoundAssignOperator *E,
541                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
542   TestAndClearIgnoreReal();
543   TestAndClearIgnoreImag();
544   bool ignreal = TestAndClearIgnoreRealAssign();
545   bool ignimag = TestAndClearIgnoreImagAssign();
546   QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType();
547 
548   BinOpInfo OpInfo;
549 
550   // Load the RHS and LHS operands.
551   // __block variables need to have the rhs evaluated first, plus this should
552   // improve codegen a little.  It is possible for the RHS to be complex or
553   // scalar.
554   OpInfo.Ty = E->getComputationResultType();
555   OpInfo.RHS = EmitCast(E->getRHS(), OpInfo.Ty);
556 
557   LValue LHSLV = CGF.EmitLValue(E->getLHS());
558 
559 
560   // We know the LHS is a complex lvalue.
561   OpInfo.LHS=EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
562   OpInfo.LHS=EmitComplexToComplexCast(OpInfo.LHS, LHSTy, OpInfo.Ty);
563 
564   // Expand the binary operator.
565   ComplexPairTy Result = (this->*Func)(OpInfo);
566 
567   // Truncate the result back to the LHS type.
568   Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
569 
570   // Store the result value into the LHS lvalue.
571   EmitStoreOfComplex(Result, LHSLV.getAddress(), LHSLV.isVolatileQualified());
572   // And now return the LHS
573   IgnoreReal = ignreal;
574   IgnoreImag = ignimag;
575   IgnoreRealAssign = ignreal;
576   IgnoreImagAssign = ignimag;
577   return EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
578 }
579 
580 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
581   TestAndClearIgnoreReal();
582   TestAndClearIgnoreImag();
583   bool ignreal = TestAndClearIgnoreRealAssign();
584   bool ignimag = TestAndClearIgnoreImagAssign();
585   assert(CGF.getContext().getCanonicalType(E->getLHS()->getType()) ==
586          CGF.getContext().getCanonicalType(E->getRHS()->getType()) &&
587          "Invalid assignment");
588   // Emit the RHS.
589   ComplexPairTy Val = Visit(E->getRHS());
590 
591   // Compute the address to store into.
592   LValue LHS = CGF.EmitLValue(E->getLHS());
593 
594   // Store into it, if simple.
595   if (LHS.isSimple()) {
596     EmitStoreOfComplex(Val, LHS.getAddress(), LHS.isVolatileQualified());
597 
598     // And now return the LHS
599     IgnoreReal = ignreal;
600     IgnoreImag = ignimag;
601     IgnoreRealAssign = ignreal;
602     IgnoreImagAssign = ignimag;
603     return EmitLoadOfComplex(LHS.getAddress(), LHS.isVolatileQualified());
604   }
605 
606   // Otherwise we must have a property setter (no complex vector/bitfields).
607   if (LHS.isPropertyRef())
608     CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), RValue::getComplex(Val));
609   else
610     CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Val));
611 
612   // There is no reload after a store through a method, but we need to restore
613   // the Ignore* flags.
614   IgnoreReal = ignreal;
615   IgnoreImag = ignimag;
616   IgnoreRealAssign = ignreal;
617   IgnoreImagAssign = ignimag;
618   return Val;
619 }
620 
621 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
622   CGF.EmitStmt(E->getLHS());
623   CGF.EnsureInsertPoint();
624   return Visit(E->getRHS());
625 }
626 
627 ComplexPairTy ComplexExprEmitter::
628 VisitConditionalOperator(const ConditionalOperator *E) {
629   TestAndClearIgnoreReal();
630   TestAndClearIgnoreImag();
631   TestAndClearIgnoreRealAssign();
632   TestAndClearIgnoreImagAssign();
633   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
634   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
635   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
636 
637   llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond());
638   Builder.CreateCondBr(Cond, LHSBlock, RHSBlock);
639 
640   CGF.EmitBlock(LHSBlock);
641 
642   // Handle the GNU extension for missing LHS.
643   assert(E->getLHS() && "Must have LHS for complex value");
644 
645   ComplexPairTy LHS = Visit(E->getLHS());
646   LHSBlock = Builder.GetInsertBlock();
647   CGF.EmitBranch(ContBlock);
648 
649   CGF.EmitBlock(RHSBlock);
650 
651   ComplexPairTy RHS = Visit(E->getRHS());
652   RHSBlock = Builder.GetInsertBlock();
653   CGF.EmitBranch(ContBlock);
654 
655   CGF.EmitBlock(ContBlock);
656 
657   // Create a PHI node for the real part.
658   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
659   RealPN->reserveOperandSpace(2);
660   RealPN->addIncoming(LHS.first, LHSBlock);
661   RealPN->addIncoming(RHS.first, RHSBlock);
662 
663   // Create a PHI node for the imaginary part.
664   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
665   ImagPN->reserveOperandSpace(2);
666   ImagPN->addIncoming(LHS.second, LHSBlock);
667   ImagPN->addIncoming(RHS.second, RHSBlock);
668 
669   return ComplexPairTy(RealPN, ImagPN);
670 }
671 
672 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
673   return Visit(E->getChosenSubExpr(CGF.getContext()));
674 }
675 
676 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
677     bool Ignore = TestAndClearIgnoreReal();
678     (void)Ignore;
679     assert (Ignore == false && "init list ignored");
680     Ignore = TestAndClearIgnoreImag();
681     (void)Ignore;
682     assert (Ignore == false && "init list ignored");
683   if (E->getNumInits())
684     return Visit(E->getInit(0));
685 
686   // Empty init list intializes to null
687   QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
688   const llvm::Type* LTy = CGF.ConvertType(Ty);
689   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
690   return ComplexPairTy(zeroConstant, zeroConstant);
691 }
692 
693 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
694   llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
695   llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
696 
697   if (!ArgPtr) {
698     CGF.ErrorUnsupported(E, "complex va_arg expression");
699     const llvm::Type *EltTy =
700       CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
701     llvm::Value *U = llvm::UndefValue::get(EltTy);
702     return ComplexPairTy(U, U);
703   }
704 
705   // FIXME Volatility.
706   return EmitLoadOfComplex(ArgPtr, false);
707 }
708 
709 //===----------------------------------------------------------------------===//
710 //                         Entry Point into this File
711 //===----------------------------------------------------------------------===//
712 
713 /// EmitComplexExpr - Emit the computation of the specified expression of
714 /// complex type, ignoring the result.
715 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
716                                                bool IgnoreImag, bool IgnoreRealAssign, bool IgnoreImagAssign) {
717   assert(E && E->getType()->isAnyComplexType() &&
718          "Invalid complex expression to emit");
719 
720   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag, IgnoreRealAssign,
721                             IgnoreImagAssign)
722     .Visit(const_cast<Expr*>(E));
723 }
724 
725 /// EmitComplexExprIntoAddr - Emit the computation of the specified expression
726 /// of complex type, storing into the specified Value*.
727 void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
728                                               llvm::Value *DestAddr,
729                                               bool DestIsVolatile) {
730   assert(E && E->getType()->isAnyComplexType() &&
731          "Invalid complex expression to emit");
732   ComplexExprEmitter Emitter(*this);
733   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
734   Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
735 }
736 
737 /// StoreComplexToAddr - Store a complex number into the specified address.
738 void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
739                                          llvm::Value *DestAddr,
740                                          bool DestIsVolatile) {
741   ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
742 }
743 
744 /// LoadComplexFromAddr - Load a complex number from the specified address.
745 ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
746                                                    bool SrcIsVolatile) {
747   return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
748 }
749