CGExprComplex.cpp revision d295b8229c119e0f2b085874249437347084e320 
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"
21using namespace clang;
22using namespace CodeGen;
23
24//===----------------------------------------------------------------------===//
25//                        Complex Expression Emitter
26//===----------------------------------------------------------------------===//
27
28typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
29
30namespace  {
31class 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;
38public:
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    return EmitLoadOfLValue(CGF.EmitLValue(E));
64  }
65
66  ComplexPairTy EmitLoadOfLValue(LValue LV) {
67    if (LV.isSimple())
68      return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
69
70    assert(LV.isPropertyRef() && "Unknown LValue type!");
71    return CGF.EmitLoadOfPropertyRefLValue(LV).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  /// EmitStoreThroughLValue - Given an l-value of complex type, store
79  /// a complex number into it.
80  void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
81    if (LV.isSimple())
82      return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
83
84    assert(LV.isPropertyRef() && "Unknown LValue type!");
85    CGF.EmitStoreThroughPropertyRefLValue(RValue::getComplex(Val), LV);
86  }
87
88  /// EmitStoreOfComplex - Store the specified real/imag parts into the
89  /// specified value pointer.
90  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
91
92  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
93  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
94                                         QualType DestType);
95
96  //===--------------------------------------------------------------------===//
97  //                            Visitor Methods
98  //===--------------------------------------------------------------------===//
99
100  ComplexPairTy Visit(Expr *E) {
101    return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
102  }
103
104  ComplexPairTy VisitStmt(Stmt *S) {
105    S->dump(CGF.getContext().getSourceManager());
106    assert(0 && "Stmt can't have complex result type!");
107    return ComplexPairTy();
108  }
109  ComplexPairTy VisitExpr(Expr *S);
110  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
111  ComplexPairTy VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
112    return Visit(GE->getResultExpr());
113  }
114  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
115  ComplexPairTy
116  VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) {
117    return Visit(PE->getReplacement());
118  }
119
120  // l-values.
121  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
122  ComplexPairTy VisitBlockDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
123  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
124    return EmitLoadOfLValue(E);
125  }
126  ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
127    assert(E->getObjectKind() == OK_Ordinary);
128    return EmitLoadOfLValue(E);
129  }
130  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
131    return CGF.EmitObjCMessageExpr(E).getComplexVal();
132  }
133  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
134  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
135  ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
136    if (E->isGLValue())
137      return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
138    return CGF.getOpaqueRValueMapping(E).getComplexVal();
139  }
140
141  // FIXME: CompoundLiteralExpr
142
143  ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
144  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
145    // Unlike for scalars, we don't have to worry about function->ptr demotion
146    // here.
147    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
148  }
149  ComplexPairTy VisitCastExpr(CastExpr *E) {
150    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
151  }
152  ComplexPairTy VisitCallExpr(const CallExpr *E);
153  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
154
155  // Operators.
156  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
157                                   bool isInc, bool isPre) {
158    LValue LV = CGF.EmitLValue(E->getSubExpr());
159    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
160  }
161  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
162    return VisitPrePostIncDec(E, false, false);
163  }
164  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
165    return VisitPrePostIncDec(E, true, false);
166  }
167  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
168    return VisitPrePostIncDec(E, false, true);
169  }
170  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
171    return VisitPrePostIncDec(E, true, true);
172  }
173  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
174  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
175    TestAndClearIgnoreReal();
176    TestAndClearIgnoreImag();
177    return Visit(E->getSubExpr());
178  }
179  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
180  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
181  // LNot,Real,Imag never return complex.
182  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
183    return Visit(E->getSubExpr());
184  }
185  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
186    return Visit(DAE->getExpr());
187  }
188  ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
189    return CGF.EmitExprWithCleanups(E).getComplexVal();
190  }
191  ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
192    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
193    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
194    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
195    return ComplexPairTy(Null, Null);
196  }
197  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
198    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
199    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
200    llvm::Constant *Null =
201                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
202    return ComplexPairTy(Null, Null);
203  }
204
205  struct BinOpInfo {
206    ComplexPairTy LHS;
207    ComplexPairTy RHS;
208    QualType Ty;  // Computation Type.
209  };
210
211  BinOpInfo EmitBinOps(const BinaryOperator *E);
212  LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
213                                  ComplexPairTy (ComplexExprEmitter::*Func)
214                                  (const BinOpInfo &),
215                                  ComplexPairTy &Val);
216  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
217                                   ComplexPairTy (ComplexExprEmitter::*Func)
218                                   (const BinOpInfo &));
219
220  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
221  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
222  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
223  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
224
225  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
226    return EmitBinAdd(EmitBinOps(E));
227  }
228  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
229    return EmitBinSub(EmitBinOps(E));
230  }
231  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
232    return EmitBinMul(EmitBinOps(E));
233  }
234  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
235    return EmitBinDiv(EmitBinOps(E));
236  }
237
238  // Compound assignments.
239  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
240    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
241  }
242  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
243    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
244  }
245  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
246    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
247  }
248  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
249    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
250  }
251
252  // GCC rejects rem/and/or/xor for integer complex.
253  // Logical and/or always return int, never complex.
254
255  // No comparisons produce a complex result.
256
257  LValue EmitBinAssignLValue(const BinaryOperator *E,
258                             ComplexPairTy &Val);
259  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
260  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
261
262
263  ComplexPairTy
264  VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
265  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
266
267  ComplexPairTy VisitInitListExpr(InitListExpr *E);
268
269  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
270};
271}  // end anonymous namespace.
272
273//===----------------------------------------------------------------------===//
274//                                Utilities
275//===----------------------------------------------------------------------===//
276
277/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
278/// load the real and imaginary pieces, returning them as Real/Imag.
279ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
280                                                    bool isVolatile) {
281  llvm::Value *Real=0, *Imag=0;
282
283  if (!IgnoreReal || isVolatile) {
284    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
285                                                 SrcPtr->getName() + ".realp");
286    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
287  }
288
289  if (!IgnoreImag || isVolatile) {
290    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
291                                                 SrcPtr->getName() + ".imagp");
292    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
293  }
294  return ComplexPairTy(Real, Imag);
295}
296
297/// EmitStoreOfComplex - Store the specified real/imag parts into the
298/// specified value pointer.
299void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
300                                            bool isVolatile) {
301  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
302  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
303
304  Builder.CreateStore(Val.first, RealPtr, isVolatile);
305  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
306}
307
308
309
310//===----------------------------------------------------------------------===//
311//                            Visitor Methods
312//===----------------------------------------------------------------------===//
313
314ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
315  CGF.ErrorUnsupported(E, "complex expression");
316  llvm::Type *EltTy =
317  CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
318  llvm::Value *U = llvm::UndefValue::get(EltTy);
319  return ComplexPairTy(U, U);
320}
321
322ComplexPairTy ComplexExprEmitter::
323VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
324  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
325  return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
326}
327
328
329ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
330  if (E->getCallReturnType()->isReferenceType())
331    return EmitLoadOfLValue(E);
332
333  return CGF.EmitCallExpr(E).getComplexVal();
334}
335
336ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
337  CodeGenFunction::StmtExprEvaluation eval(CGF);
338  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
339}
340
341/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
342ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
343                                                           QualType SrcType,
344                                                           QualType DestType) {
345  // Get the src/dest element type.
346  SrcType = SrcType->getAs<ComplexType>()->getElementType();
347  DestType = DestType->getAs<ComplexType>()->getElementType();
348
349  // C99 6.3.1.6: When a value of complex type is converted to another
350  // complex type, both the real and imaginary parts follow the conversion
351  // rules for the corresponding real types.
352  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
353  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
354  return Val;
355}
356
357ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
358                                           QualType DestTy) {
359  switch (CK) {
360  case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
361
362  case CK_GetObjCProperty: {
363    LValue LV = CGF.EmitLValue(Op);
364    assert(LV.isPropertyRef() && "Unknown LValue type!");
365    return CGF.EmitLoadOfPropertyRefLValue(LV).getComplexVal();
366  }
367
368  case CK_NoOp:
369  case CK_LValueToRValue:
370  case CK_UserDefinedConversion:
371    return Visit(Op);
372
373  case CK_LValueBitCast: {
374    llvm::Value *V = CGF.EmitLValue(Op).getAddress();
375    V = Builder.CreateBitCast(V,
376                    CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
377    // FIXME: Are the qualifiers correct here?
378    return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
379  }
380
381  case CK_BitCast:
382  case CK_BaseToDerived:
383  case CK_DerivedToBase:
384  case CK_UncheckedDerivedToBase:
385  case CK_Dynamic:
386  case CK_ToUnion:
387  case CK_ArrayToPointerDecay:
388  case CK_FunctionToPointerDecay:
389  case CK_NullToPointer:
390  case CK_NullToMemberPointer:
391  case CK_BaseToDerivedMemberPointer:
392  case CK_DerivedToBaseMemberPointer:
393  case CK_MemberPointerToBoolean:
394  case CK_ConstructorConversion:
395  case CK_IntegralToPointer:
396  case CK_PointerToIntegral:
397  case CK_PointerToBoolean:
398  case CK_ToVoid:
399  case CK_VectorSplat:
400  case CK_IntegralCast:
401  case CK_IntegralToBoolean:
402  case CK_IntegralToFloating:
403  case CK_FloatingToIntegral:
404  case CK_FloatingToBoolean:
405  case CK_FloatingCast:
406  case CK_AnyPointerToObjCPointerCast:
407  case CK_AnyPointerToBlockPointerCast:
408  case CK_ObjCObjectLValueCast:
409  case CK_FloatingComplexToReal:
410  case CK_FloatingComplexToBoolean:
411  case CK_IntegralComplexToReal:
412  case CK_IntegralComplexToBoolean:
413  case CK_ObjCProduceObject:
414  case CK_ObjCConsumeObject:
415  case CK_ObjCReclaimReturnedObject:
416    llvm_unreachable("invalid cast kind for complex value");
417
418  case CK_FloatingRealToComplex:
419  case CK_IntegralRealToComplex: {
420    llvm::Value *Elt = CGF.EmitScalarExpr(Op);
421
422    // Convert the input element to the element type of the complex.
423    DestTy = DestTy->getAs<ComplexType>()->getElementType();
424    Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
425
426    // Return (realval, 0).
427    return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
428  }
429
430  case CK_FloatingComplexCast:
431  case CK_FloatingComplexToIntegralComplex:
432  case CK_IntegralComplexCast:
433  case CK_IntegralComplexToFloatingComplex:
434    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
435  }
436
437  llvm_unreachable("unknown cast resulting in complex value");
438}
439
440ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
441  TestAndClearIgnoreReal();
442  TestAndClearIgnoreImag();
443  ComplexPairTy Op = Visit(E->getSubExpr());
444
445  llvm::Value *ResR, *ResI;
446  if (Op.first->getType()->isFloatingPointTy()) {
447    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
448    ResI = Builder.CreateFNeg(Op.second, "neg.i");
449  } else {
450    ResR = Builder.CreateNeg(Op.first,  "neg.r");
451    ResI = Builder.CreateNeg(Op.second, "neg.i");
452  }
453  return ComplexPairTy(ResR, ResI);
454}
455
456ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
457  TestAndClearIgnoreReal();
458  TestAndClearIgnoreImag();
459  // ~(a+ib) = a + i*-b
460  ComplexPairTy Op = Visit(E->getSubExpr());
461  llvm::Value *ResI;
462  if (Op.second->getType()->isFloatingPointTy())
463    ResI = Builder.CreateFNeg(Op.second, "conj.i");
464  else
465    ResI = Builder.CreateNeg(Op.second, "conj.i");
466
467  return ComplexPairTy(Op.first, ResI);
468}
469
470ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
471  llvm::Value *ResR, *ResI;
472
473  if (Op.LHS.first->getType()->isFloatingPointTy()) {
474    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
475    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
476  } else {
477    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
478    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
479  }
480  return ComplexPairTy(ResR, ResI);
481}
482
483ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
484  llvm::Value *ResR, *ResI;
485  if (Op.LHS.first->getType()->isFloatingPointTy()) {
486    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
487    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
488  } else {
489    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
490    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
491  }
492  return ComplexPairTy(ResR, ResI);
493}
494
495
496ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
497  using llvm::Value;
498  Value *ResR, *ResI;
499
500  if (Op.LHS.first->getType()->isFloatingPointTy()) {
501    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
502    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
503    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
504
505    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
506    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
507    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
508  } else {
509    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
510    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
511    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
512
513    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
514    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
515    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
516  }
517  return ComplexPairTy(ResR, ResI);
518}
519
520ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
521  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
522  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
523
524
525  llvm::Value *DSTr, *DSTi;
526  if (Op.LHS.first->getType()->isFloatingPointTy()) {
527    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
528    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
529    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
530    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
531
532    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
533    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
534    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
535
536    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
537    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
538    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
539
540    DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
541    DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
542  } else {
543    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
544    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
545    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
546    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
547
548    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
549    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
550    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
551
552    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
553    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
554    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
555
556    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
557      DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
558      DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
559    } else {
560      DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
561      DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
562    }
563  }
564
565  return ComplexPairTy(DSTr, DSTi);
566}
567
568ComplexExprEmitter::BinOpInfo
569ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
570  TestAndClearIgnoreReal();
571  TestAndClearIgnoreImag();
572  BinOpInfo Ops;
573  Ops.LHS = Visit(E->getLHS());
574  Ops.RHS = Visit(E->getRHS());
575  Ops.Ty = E->getType();
576  return Ops;
577}
578
579
580LValue ComplexExprEmitter::
581EmitCompoundAssignLValue(const CompoundAssignOperator *E,
582          ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
583                         ComplexPairTy &Val) {
584  TestAndClearIgnoreReal();
585  TestAndClearIgnoreImag();
586  QualType LHSTy = E->getLHS()->getType();
587
588  BinOpInfo OpInfo;
589
590  // Load the RHS and LHS operands.
591  // __block variables need to have the rhs evaluated first, plus this should
592  // improve codegen a little.
593  OpInfo.Ty = E->getComputationResultType();
594
595  // The RHS should have been converted to the computation type.
596  assert(OpInfo.Ty->isAnyComplexType());
597  assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
598                                                 E->getRHS()->getType()));
599  OpInfo.RHS = Visit(E->getRHS());
600
601  LValue LHS = CGF.EmitLValue(E->getLHS());
602
603  // Load from the l-value.
604  ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
605
606  OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
607
608  // Expand the binary operator.
609  ComplexPairTy Result = (this->*Func)(OpInfo);
610
611  // Truncate the result back to the LHS type.
612  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
613  Val = Result;
614
615  // Store the result value into the LHS lvalue.
616  EmitStoreThroughLValue(Result, LHS);
617
618  return LHS;
619}
620
621// Compound assignments.
622ComplexPairTy ComplexExprEmitter::
623EmitCompoundAssign(const CompoundAssignOperator *E,
624                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
625  ComplexPairTy Val;
626  LValue LV = EmitCompoundAssignLValue(E, Func, Val);
627
628  // The result of an assignment in C is the assigned r-value.
629  if (!CGF.getContext().getLangOptions().CPlusPlus)
630    return Val;
631
632  // Objective-C property assignment never reloads the value following a store.
633  if (LV.isPropertyRef())
634    return Val;
635
636  // If the lvalue is non-volatile, return the computed value of the assignment.
637  if (!LV.isVolatileQualified())
638    return Val;
639
640  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
641}
642
643LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
644                                               ComplexPairTy &Val) {
645  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
646                                                 E->getRHS()->getType()) &&
647         "Invalid assignment");
648  TestAndClearIgnoreReal();
649  TestAndClearIgnoreImag();
650
651  // Emit the RHS.  __block variables need the RHS evaluated first.
652  Val = Visit(E->getRHS());
653
654  // Compute the address to store into.
655  LValue LHS = CGF.EmitLValue(E->getLHS());
656
657  // Store the result value into the LHS lvalue.
658  EmitStoreThroughLValue(Val, LHS);
659
660  return LHS;
661}
662
663ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
664  ComplexPairTy Val;
665  LValue LV = EmitBinAssignLValue(E, Val);
666
667  // The result of an assignment in C is the assigned r-value.
668  if (!CGF.getContext().getLangOptions().CPlusPlus)
669    return Val;
670
671  // Objective-C property assignment never reloads the value following a store.
672  if (LV.isPropertyRef())
673    return Val;
674
675  // If the lvalue is non-volatile, return the computed value of the assignment.
676  if (!LV.isVolatileQualified())
677    return Val;
678
679  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
680}
681
682ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
683  CGF.EmitIgnoredExpr(E->getLHS());
684  return Visit(E->getRHS());
685}
686
687ComplexPairTy ComplexExprEmitter::
688VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
689  TestAndClearIgnoreReal();
690  TestAndClearIgnoreImag();
691  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
692  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
693  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
694
695  // Bind the common expression if necessary.
696  CodeGenFunction::OpaqueValueMapping binding(CGF, E);
697
698  CodeGenFunction::ConditionalEvaluation eval(CGF);
699  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
700
701  eval.begin(CGF);
702  CGF.EmitBlock(LHSBlock);
703  ComplexPairTy LHS = Visit(E->getTrueExpr());
704  LHSBlock = Builder.GetInsertBlock();
705  CGF.EmitBranch(ContBlock);
706  eval.end(CGF);
707
708  eval.begin(CGF);
709  CGF.EmitBlock(RHSBlock);
710  ComplexPairTy RHS = Visit(E->getFalseExpr());
711  RHSBlock = Builder.GetInsertBlock();
712  CGF.EmitBlock(ContBlock);
713  eval.end(CGF);
714
715  // Create a PHI node for the real part.
716  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
717  RealPN->addIncoming(LHS.first, LHSBlock);
718  RealPN->addIncoming(RHS.first, RHSBlock);
719
720  // Create a PHI node for the imaginary part.
721  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
722  ImagPN->addIncoming(LHS.second, LHSBlock);
723  ImagPN->addIncoming(RHS.second, RHSBlock);
724
725  return ComplexPairTy(RealPN, ImagPN);
726}
727
728ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
729  return Visit(E->getChosenSubExpr(CGF.getContext()));
730}
731
732ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
733    bool Ignore = TestAndClearIgnoreReal();
734    (void)Ignore;
735    assert (Ignore == false && "init list ignored");
736    Ignore = TestAndClearIgnoreImag();
737    (void)Ignore;
738    assert (Ignore == false && "init list ignored");
739  if (E->getNumInits())
740    return Visit(E->getInit(0));
741
742  // Empty init list intializes to null
743  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
744  llvm::Type* LTy = CGF.ConvertType(Ty);
745  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
746  return ComplexPairTy(zeroConstant, zeroConstant);
747}
748
749ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
750  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
751  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
752
753  if (!ArgPtr) {
754    CGF.ErrorUnsupported(E, "complex va_arg expression");
755    llvm::Type *EltTy =
756      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
757    llvm::Value *U = llvm::UndefValue::get(EltTy);
758    return ComplexPairTy(U, U);
759  }
760
761  // FIXME Volatility.
762  return EmitLoadOfComplex(ArgPtr, false);
763}
764
765//===----------------------------------------------------------------------===//
766//                         Entry Point into this File
767//===----------------------------------------------------------------------===//
768
769/// EmitComplexExpr - Emit the computation of the specified expression of
770/// complex type, ignoring the result.
771ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
772                                               bool IgnoreImag) {
773  assert(E && E->getType()->isAnyComplexType() &&
774         "Invalid complex expression to emit");
775
776  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
777    .Visit(const_cast<Expr*>(E));
778}
779
780/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
781/// of complex type, storing into the specified Value*.
782void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
783                                              llvm::Value *DestAddr,
784                                              bool DestIsVolatile) {
785  assert(E && E->getType()->isAnyComplexType() &&
786         "Invalid complex expression to emit");
787  ComplexExprEmitter Emitter(*this);
788  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
789  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
790}
791
792/// StoreComplexToAddr - Store a complex number into the specified address.
793void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
794                                         llvm::Value *DestAddr,
795                                         bool DestIsVolatile) {
796  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
797}
798
799/// LoadComplexFromAddr - Load a complex number from the specified address.
800ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
801                                                   bool SrcIsVolatile) {
802  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
803}
804
805LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
806  assert(E->getOpcode() == BO_Assign);
807  ComplexPairTy Val; // ignored
808  return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
809}
810
811LValue CodeGenFunction::
812EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
813  ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
814  switch (E->getOpcode()) {
815  case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
816  case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
817  case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
818  case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
819
820  default:
821    llvm_unreachable("unexpected complex compound assignment");
822    Op = 0;
823  }
824
825  ComplexPairTy Val; // ignored
826  return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
827}
828