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 public:
39   ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
40     : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
41   }
42 
43 
44   //===--------------------------------------------------------------------===//
45   //                               Utilities
46   //===--------------------------------------------------------------------===//
47 
48   bool TestAndClearIgnoreReal() {
49     bool I = IgnoreReal;
50     IgnoreReal = false;
51     return I;
52   }
53   bool TestAndClearIgnoreImag() {
54     bool I = IgnoreImag;
55     IgnoreImag = false;
56     return I;
57   }
58 
59   /// EmitLoadOfLValue - Given an expression with complex type that represents a
60   /// value l-value, this method emits the address of the l-value, then loads
61   /// and returns the result.
62   ComplexPairTy EmitLoadOfLValue(const Expr *E) {
63     LValue LV = CGF.EmitLValue(E);
64     if (LV.isSimple())
65       return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
66 
67     if (LV.isPropertyRef())
68       return CGF.EmitObjCPropertyGet(LV.getPropertyRefExpr()).getComplexVal();
69 
70     assert(LV.isKVCRef() && "Unknown LValue type!");
71     return CGF.EmitObjCPropertyGet(LV.getKVCRefExpr()).getComplexVal();
72   }
73 
74   /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
75   /// the real and imaginary pieces.
76   ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
77 
78   /// EmitStoreOfComplex - Store the specified real/imag parts into the
79   /// specified value pointer.
80   void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
81 
82   /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
83   ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
84                                          QualType DestType);
85 
86   //===--------------------------------------------------------------------===//
87   //                            Visitor Methods
88   //===--------------------------------------------------------------------===//
89 
90   ComplexPairTy Visit(Expr *E) {
91     llvm::DenseMap<const Expr *, ComplexPairTy>::iterator I =
92       CGF.ConditionalSaveComplexExprs.find(E);
93     if (I != CGF.ConditionalSaveComplexExprs.end())
94       return I->second;
95 
96       return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
97   }
98 
99   ComplexPairTy VisitStmt(Stmt *S) {
100     S->dump(CGF.getContext().getSourceManager());
101     assert(0 && "Stmt can't have complex result type!");
102     return ComplexPairTy();
103   }
104   ComplexPairTy VisitExpr(Expr *S);
105   ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
106   ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
107 
108   // l-values.
109   ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
110   ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
111     return EmitLoadOfLValue(E);
112   }
113   ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
114     return EmitLoadOfLValue(E);
115   }
116   ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
117     return CGF.EmitObjCMessageExpr(E).getComplexVal();
118   }
119   ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
120   ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
121 
122   // FIXME: CompoundLiteralExpr
123 
124   ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
125   ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
126     // Unlike for scalars, we don't have to worry about function->ptr demotion
127     // here.
128     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
129   }
130   ComplexPairTy VisitCastExpr(CastExpr *E) {
131     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
132   }
133   ComplexPairTy VisitCallExpr(const CallExpr *E);
134   ComplexPairTy VisitStmtExpr(const StmtExpr *E);
135 
136   // Operators.
137   ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
138                                    bool isInc, bool isPre) {
139     LValue LV = CGF.EmitLValue(E->getSubExpr());
140     return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
141   }
142   ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
143     return VisitPrePostIncDec(E, false, false);
144   }
145   ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
146     return VisitPrePostIncDec(E, true, false);
147   }
148   ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
149     return VisitPrePostIncDec(E, false, true);
150   }
151   ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
152     return VisitPrePostIncDec(E, true, true);
153   }
154   ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
155   ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
156     TestAndClearIgnoreReal();
157     TestAndClearIgnoreImag();
158     return Visit(E->getSubExpr());
159   }
160   ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
161   ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
162   // LNot,Real,Imag never return complex.
163   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
164     return Visit(E->getSubExpr());
165   }
166   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
167     return Visit(DAE->getExpr());
168   }
169   ComplexPairTy VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
170     return CGF.EmitCXXExprWithTemporaries(E).getComplexVal();
171   }
172   ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
173     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
174     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
175     llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
176     return ComplexPairTy(Null, Null);
177   }
178   ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
179     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
180     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
181     llvm::Constant *Null =
182                        llvm::Constant::getNullValue(CGF.ConvertType(Elem));
183     return ComplexPairTy(Null, Null);
184   }
185 
186   struct BinOpInfo {
187     ComplexPairTy LHS;
188     ComplexPairTy RHS;
189     QualType Ty;  // Computation Type.
190   };
191 
192   BinOpInfo EmitBinOps(const BinaryOperator *E);
193   LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
194                                   ComplexPairTy (ComplexExprEmitter::*Func)
195                                   (const BinOpInfo &),
196                                   ComplexPairTy &Val);
197   ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
198                                    ComplexPairTy (ComplexExprEmitter::*Func)
199                                    (const BinOpInfo &));
200 
201   ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
202   ComplexPairTy EmitBinSub(const BinOpInfo &Op);
203   ComplexPairTy EmitBinMul(const BinOpInfo &Op);
204   ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
205 
206   ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
207     return EmitBinAdd(EmitBinOps(E));
208   }
209   ComplexPairTy VisitBinSub(const BinaryOperator *E) {
210     return EmitBinSub(EmitBinOps(E));
211   }
212   ComplexPairTy VisitBinMul(const BinaryOperator *E) {
213     return EmitBinMul(EmitBinOps(E));
214   }
215   ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
216     return EmitBinDiv(EmitBinOps(E));
217   }
218 
219   // Compound assignments.
220   ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
221     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
222   }
223   ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
224     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
225   }
226   ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
227     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
228   }
229   ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
230     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
231   }
232 
233   // GCC rejects rem/and/or/xor for integer complex.
234   // Logical and/or always return int, never complex.
235 
236   // No comparisons produce a complex result.
237 
238   LValue EmitBinAssignLValue(const BinaryOperator *E,
239                              ComplexPairTy &Val);
240   ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
241   ComplexPairTy VisitBinComma      (const BinaryOperator *E);
242 
243 
244   ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
245   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
246 
247   ComplexPairTy VisitInitListExpr(InitListExpr *E);
248 
249   ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
250 };
251 }  // end anonymous namespace.
252 
253 //===----------------------------------------------------------------------===//
254 //                                Utilities
255 //===----------------------------------------------------------------------===//
256 
257 /// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
258 /// load the real and imaginary pieces, returning them as Real/Imag.
259 ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
260                                                     bool isVolatile) {
261   llvm::Value *Real=0, *Imag=0;
262 
263   if (!IgnoreReal || isVolatile) {
264     llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
265                                                  SrcPtr->getName() + ".realp");
266     Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
267   }
268 
269   if (!IgnoreImag || isVolatile) {
270     llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
271                                                  SrcPtr->getName() + ".imagp");
272     Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
273   }
274   return ComplexPairTy(Real, Imag);
275 }
276 
277 /// EmitStoreOfComplex - Store the specified real/imag parts into the
278 /// specified value pointer.
279 void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
280                                             bool isVolatile) {
281   llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
282   llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
283 
284   Builder.CreateStore(Val.first, RealPtr, isVolatile);
285   Builder.CreateStore(Val.second, ImagPtr, isVolatile);
286 }
287 
288 
289 
290 //===----------------------------------------------------------------------===//
291 //                            Visitor Methods
292 //===----------------------------------------------------------------------===//
293 
294 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
295   CGF.ErrorUnsupported(E, "complex expression");
296   const llvm::Type *EltTy =
297     CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
298   llvm::Value *U = llvm::UndefValue::get(EltTy);
299   return ComplexPairTy(U, U);
300 }
301 
302 ComplexPairTy ComplexExprEmitter::
303 VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
304   llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
305   return
306         ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
307 }
308 
309 
310 ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
311   if (E->getCallReturnType()->isReferenceType())
312     return EmitLoadOfLValue(E);
313 
314   return CGF.EmitCallExpr(E).getComplexVal();
315 }
316 
317 ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
318   return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
319 }
320 
321 /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
322 ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
323                                                            QualType SrcType,
324                                                            QualType DestType) {
325   // Get the src/dest element type.
326   SrcType = SrcType->getAs<ComplexType>()->getElementType();
327   DestType = DestType->getAs<ComplexType>()->getElementType();
328 
329   // C99 6.3.1.6: When a value of complex type is converted to another
330   // complex type, both the real and imaginary parts follow the conversion
331   // rules for the corresponding real types.
332   Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
333   Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
334   return Val;
335 }
336 
337 ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
338                                            QualType DestTy) {
339   // FIXME: this should be based off of the CastKind.
340 
341   // Two cases here: cast from (complex to complex) and (scalar to complex).
342   if (Op->getType()->isAnyComplexType())
343     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
344 
345   // FIXME: We should be looking at all of the cast kinds here, not
346   // cherry-picking the ones we have test cases for.
347   if (CK == CK_LValueBitCast) {
348     llvm::Value *V = CGF.EmitLValue(Op).getAddress();
349     V = Builder.CreateBitCast(V,
350                       CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
351     // FIXME: Are the qualifiers correct here?
352     return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
353   }
354 
355   // C99 6.3.1.7: When a value of real type is converted to a complex type, the
356   // real part of the complex result value is determined by the rules of
357   // conversion to the corresponding real type and the imaginary part of the
358   // complex result value is a positive zero or an unsigned zero.
359   llvm::Value *Elt = CGF.EmitScalarExpr(Op);
360 
361   // Convert the input element to the element type of the complex.
362   DestTy = DestTy->getAs<ComplexType>()->getElementType();
363   Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
364 
365   // Return (realval, 0).
366   return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
367 }
368 
369 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
370   TestAndClearIgnoreReal();
371   TestAndClearIgnoreImag();
372   ComplexPairTy Op = Visit(E->getSubExpr());
373 
374   llvm::Value *ResR, *ResI;
375   if (Op.first->getType()->isFloatingPointTy()) {
376     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
377     ResI = Builder.CreateFNeg(Op.second, "neg.i");
378   } else {
379     ResR = Builder.CreateNeg(Op.first,  "neg.r");
380     ResI = Builder.CreateNeg(Op.second, "neg.i");
381   }
382   return ComplexPairTy(ResR, ResI);
383 }
384 
385 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
386   TestAndClearIgnoreReal();
387   TestAndClearIgnoreImag();
388   // ~(a+ib) = a + i*-b
389   ComplexPairTy Op = Visit(E->getSubExpr());
390   llvm::Value *ResI;
391   if (Op.second->getType()->isFloatingPointTy())
392     ResI = Builder.CreateFNeg(Op.second, "conj.i");
393   else
394     ResI = Builder.CreateNeg(Op.second, "conj.i");
395 
396   return ComplexPairTy(Op.first, ResI);
397 }
398 
399 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
400   llvm::Value *ResR, *ResI;
401 
402   if (Op.LHS.first->getType()->isFloatingPointTy()) {
403     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
404     ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
405   } else {
406     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
407     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
408   }
409   return ComplexPairTy(ResR, ResI);
410 }
411 
412 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
413   llvm::Value *ResR, *ResI;
414   if (Op.LHS.first->getType()->isFloatingPointTy()) {
415     ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
416     ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
417   } else {
418     ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
419     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
420   }
421   return ComplexPairTy(ResR, ResI);
422 }
423 
424 
425 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
426   using llvm::Value;
427   Value *ResR, *ResI;
428 
429   if (Op.LHS.first->getType()->isFloatingPointTy()) {
430     Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
431     Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
432     ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
433 
434     Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
435     Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
436     ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
437   } else {
438     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
439     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
440     ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
441 
442     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
443     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
444     ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
445   }
446   return ComplexPairTy(ResR, ResI);
447 }
448 
449 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
450   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
451   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
452 
453 
454   llvm::Value *DSTr, *DSTi;
455   if (Op.LHS.first->getType()->isFloatingPointTy()) {
456     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
457     llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
458     llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
459     llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
460 
461     llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
462     llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
463     llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
464 
465     llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
466     llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
467     llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
468 
469     DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
470     DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
471   } else {
472     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
473     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
474     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
475     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
476 
477     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
478     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
479     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
480 
481     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
482     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
483     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
484 
485     if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
486       DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
487       DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
488     } else {
489       DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
490       DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
491     }
492   }
493 
494   return ComplexPairTy(DSTr, DSTi);
495 }
496 
497 ComplexExprEmitter::BinOpInfo
498 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
499   TestAndClearIgnoreReal();
500   TestAndClearIgnoreImag();
501   BinOpInfo Ops;
502   Ops.LHS = Visit(E->getLHS());
503   Ops.RHS = Visit(E->getRHS());
504   Ops.Ty = E->getType();
505   return Ops;
506 }
507 
508 
509 LValue ComplexExprEmitter::
510 EmitCompoundAssignLValue(const CompoundAssignOperator *E,
511           ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
512                          ComplexPairTy &Val) {
513   TestAndClearIgnoreReal();
514   TestAndClearIgnoreImag();
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.
522   OpInfo.Ty = E->getComputationResultType();
523 
524   // The RHS should have been converted to the computation type.
525   assert(OpInfo.Ty->isAnyComplexType());
526   assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
527                                                  E->getRHS()->getType()));
528   OpInfo.RHS = Visit(E->getRHS());
529 
530   LValue LHS = CGF.EmitLValue(E->getLHS());
531   // We know the LHS is a complex lvalue.
532   ComplexPairTy LHSComplexPair;
533   if (LHS.isPropertyRef())
534     LHSComplexPair =
535       CGF.EmitObjCPropertyGet(LHS.getPropertyRefExpr()).getComplexVal();
536   else if (LHS.isKVCRef())
537     LHSComplexPair =
538       CGF.EmitObjCPropertyGet(LHS.getKVCRefExpr()).getComplexVal();
539   else
540     LHSComplexPair = EmitLoadOfComplex(LHS.getAddress(),
541                                        LHS.isVolatileQualified());
542 
543   OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
544 
545   // Expand the binary operator.
546   ComplexPairTy Result = (this->*Func)(OpInfo);
547 
548   // Truncate the result back to the LHS type.
549   Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
550   Val = Result;
551 
552   // Store the result value into the LHS lvalue.
553   if (LHS.isPropertyRef())
554     CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(),
555                             RValue::getComplex(Result));
556   else if (LHS.isKVCRef())
557     CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Result));
558   else
559     EmitStoreOfComplex(Result, LHS.getAddress(), LHS.isVolatileQualified());
560 
561   return LHS;
562 }
563 
564 // Compound assignments.
565 ComplexPairTy ComplexExprEmitter::
566 EmitCompoundAssign(const CompoundAssignOperator *E,
567                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
568   ComplexPairTy Val;
569   LValue LV = EmitCompoundAssignLValue(E, Func, Val);
570 
571   // The result of an assignment in C is the assigned r-value.
572   if (!CGF.getContext().getLangOptions().CPlusPlus)
573     return Val;
574 
575   // Objective-C property assignment never reloads the value following a store.
576   if (LV.isPropertyRef() || LV.isKVCRef())
577     return Val;
578 
579   // If the lvalue is non-volatile, return the computed value of the assignment.
580   if (!LV.isVolatileQualified())
581     return Val;
582 
583   return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
584 }
585 
586 LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
587                                                ComplexPairTy &Val) {
588   assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
589                                                  E->getRHS()->getType()) &&
590          "Invalid assignment");
591   TestAndClearIgnoreReal();
592   TestAndClearIgnoreImag();
593 
594   // Emit the RHS.
595   Val = Visit(E->getRHS());
596 
597   // Compute the address to store into.
598   LValue LHS = CGF.EmitLValue(E->getLHS());
599 
600   // Store the result value into the LHS lvalue.
601   if (LHS.isPropertyRef())
602     CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), RValue::getComplex(Val));
603   else if (LHS.isKVCRef())
604     CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Val));
605   else
606     EmitStoreOfComplex(Val, LHS.getAddress(), LHS.isVolatileQualified());
607 
608   return LHS;
609 }
610 
611 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
612   ComplexPairTy Val;
613   LValue LV = EmitBinAssignLValue(E, Val);
614 
615   // The result of an assignment in C is the assigned r-value.
616   if (!CGF.getContext().getLangOptions().CPlusPlus)
617     return Val;
618 
619   // Objective-C property assignment never reloads the value following a store.
620   if (LV.isPropertyRef() || LV.isKVCRef())
621     return Val;
622 
623   // If the lvalue is non-volatile, return the computed value of the assignment.
624   if (!LV.isVolatileQualified())
625     return Val;
626 
627   return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
628 }
629 
630 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
631   CGF.EmitStmt(E->getLHS());
632   CGF.EnsureInsertPoint();
633   return Visit(E->getRHS());
634 }
635 
636 ComplexPairTy ComplexExprEmitter::
637 VisitConditionalOperator(const ConditionalOperator *E) {
638   TestAndClearIgnoreReal();
639   TestAndClearIgnoreImag();
640   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
641   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
642   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
643 
644   if (E->getLHS())
645     CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
646   else {
647     Expr *save = E->getSAVE();
648     assert(save && "VisitConditionalOperator - save is null");
649     // Intentianlly not doing direct assignment to ConditionalSaveExprs[save] !!
650     ComplexPairTy SaveVal = Visit(save);
651     CGF.ConditionalSaveComplexExprs[save] = SaveVal;
652     CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
653   }
654 
655   CGF.EmitBlock(LHSBlock);
656   ComplexPairTy LHS = Visit(E->getTrueExpr());
657   LHSBlock = Builder.GetInsertBlock();
658   CGF.EmitBranch(ContBlock);
659 
660   CGF.EmitBlock(RHSBlock);
661 
662   ComplexPairTy RHS = Visit(E->getRHS());
663   RHSBlock = Builder.GetInsertBlock();
664   CGF.EmitBranch(ContBlock);
665 
666   CGF.EmitBlock(ContBlock);
667 
668   // Create a PHI node for the real part.
669   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
670   RealPN->reserveOperandSpace(2);
671   RealPN->addIncoming(LHS.first, LHSBlock);
672   RealPN->addIncoming(RHS.first, RHSBlock);
673 
674   // Create a PHI node for the imaginary part.
675   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
676   ImagPN->reserveOperandSpace(2);
677   ImagPN->addIncoming(LHS.second, LHSBlock);
678   ImagPN->addIncoming(RHS.second, RHSBlock);
679 
680   return ComplexPairTy(RealPN, ImagPN);
681 }
682 
683 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
684   return Visit(E->getChosenSubExpr(CGF.getContext()));
685 }
686 
687 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
688     bool Ignore = TestAndClearIgnoreReal();
689     (void)Ignore;
690     assert (Ignore == false && "init list ignored");
691     Ignore = TestAndClearIgnoreImag();
692     (void)Ignore;
693     assert (Ignore == false && "init list ignored");
694   if (E->getNumInits())
695     return Visit(E->getInit(0));
696 
697   // Empty init list intializes to null
698   QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
699   const llvm::Type* LTy = CGF.ConvertType(Ty);
700   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
701   return ComplexPairTy(zeroConstant, zeroConstant);
702 }
703 
704 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
705   llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
706   llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
707 
708   if (!ArgPtr) {
709     CGF.ErrorUnsupported(E, "complex va_arg expression");
710     const llvm::Type *EltTy =
711       CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
712     llvm::Value *U = llvm::UndefValue::get(EltTy);
713     return ComplexPairTy(U, U);
714   }
715 
716   // FIXME Volatility.
717   return EmitLoadOfComplex(ArgPtr, false);
718 }
719 
720 //===----------------------------------------------------------------------===//
721 //                         Entry Point into this File
722 //===----------------------------------------------------------------------===//
723 
724 /// EmitComplexExpr - Emit the computation of the specified expression of
725 /// complex type, ignoring the result.
726 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
727                                                bool IgnoreImag) {
728   assert(E && E->getType()->isAnyComplexType() &&
729          "Invalid complex expression to emit");
730 
731   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
732     .Visit(const_cast<Expr*>(E));
733 }
734 
735 /// EmitComplexExprIntoAddr - Emit the computation of the specified expression
736 /// of complex type, storing into the specified Value*.
737 void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
738                                               llvm::Value *DestAddr,
739                                               bool DestIsVolatile) {
740   assert(E && E->getType()->isAnyComplexType() &&
741          "Invalid complex expression to emit");
742   ComplexExprEmitter Emitter(*this);
743   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
744   Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
745 }
746 
747 /// StoreComplexToAddr - Store a complex number into the specified address.
748 void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
749                                          llvm::Value *DestAddr,
750                                          bool DestIsVolatile) {
751   ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
752 }
753 
754 /// LoadComplexFromAddr - Load a complex number from the specified address.
755 ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
756                                                    bool SrcIsVolatile) {
757   return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
758 }
759 
760 LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
761   ComplexPairTy Val; // ignored
762 
763   ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
764 
765   switch (E->getOpcode()) {
766   case BO_Assign:
767     return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
768 
769   case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
770   case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
771   case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
772   case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
773 
774   default:
775     llvm_unreachable("unexpected complex compound assignment");
776     Op = 0;
777   }
778 
779   return ComplexExprEmitter(*this).EmitCompoundAssignLValue(
780                                    cast<CompoundAssignOperator>(E), Op, Val);
781 }
782