CGExprComplex.cpp revision 7a7ee3033e44b45630981355460ef89efa0bdcc4 
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    assert(LV.isSimple() && "complex l-value must be simple");
68    return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
69  }
70
71  /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
72  /// the real and imaginary pieces.
73  ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
74
75  /// EmitStoreThroughLValue - Given an l-value of complex type, store
76  /// a complex number into it.
77  void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
78    assert(LV.isSimple() && "complex l-value must be simple");
79    return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
80  }
81
82  /// EmitStoreOfComplex - Store the specified real/imag parts into the
83  /// specified value pointer.
84  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
85
86  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
87  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
88                                         QualType DestType);
89
90  //===--------------------------------------------------------------------===//
91  //                            Visitor Methods
92  //===--------------------------------------------------------------------===//
93
94  ComplexPairTy Visit(Expr *E) {
95    return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
96  }
97
98  ComplexPairTy VisitStmt(Stmt *S) {
99    S->dump(CGF.getContext().getSourceManager());
100    llvm_unreachable("Stmt can't have complex result type!");
101  }
102  ComplexPairTy VisitExpr(Expr *S);
103  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
104  ComplexPairTy VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
105    return Visit(GE->getResultExpr());
106  }
107  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
108  ComplexPairTy
109  VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) {
110    return Visit(PE->getReplacement());
111  }
112
113  // l-values.
114  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
115  ComplexPairTy VisitBlockDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
116  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
117    return EmitLoadOfLValue(E);
118  }
119  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
120    return CGF.EmitObjCMessageExpr(E).getComplexVal();
121  }
122  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
123  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
124  ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
125    if (E->isGLValue())
126      return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
127    return CGF.getOpaqueRValueMapping(E).getComplexVal();
128  }
129
130  ComplexPairTy VisitPseudoObjectExpr(PseudoObjectExpr *E) {
131    return CGF.EmitPseudoObjectRValue(E).getComplexVal();
132  }
133
134  // FIXME: CompoundLiteralExpr
135
136  ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
137  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
138    // Unlike for scalars, we don't have to worry about function->ptr demotion
139    // here.
140    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
141  }
142  ComplexPairTy VisitCastExpr(CastExpr *E) {
143    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
144  }
145  ComplexPairTy VisitCallExpr(const CallExpr *E);
146  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
147
148  // Operators.
149  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
150                                   bool isInc, bool isPre) {
151    LValue LV = CGF.EmitLValue(E->getSubExpr());
152    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
153  }
154  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
155    return VisitPrePostIncDec(E, false, false);
156  }
157  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
158    return VisitPrePostIncDec(E, true, false);
159  }
160  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
161    return VisitPrePostIncDec(E, false, true);
162  }
163  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
164    return VisitPrePostIncDec(E, true, true);
165  }
166  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
167  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
168    TestAndClearIgnoreReal();
169    TestAndClearIgnoreImag();
170    return Visit(E->getSubExpr());
171  }
172  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
173  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
174  // LNot,Real,Imag never return complex.
175  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
176    return Visit(E->getSubExpr());
177  }
178  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
179    return Visit(DAE->getExpr());
180  }
181  ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
182    CGF.enterFullExpression(E);
183    CodeGenFunction::RunCleanupsScope Scope(CGF);
184    return Visit(E->getSubExpr());
185  }
186  ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
187    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
188    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
189    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
190    return ComplexPairTy(Null, Null);
191  }
192  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
193    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
194    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
195    llvm::Constant *Null =
196                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
197    return ComplexPairTy(Null, Null);
198  }
199
200  struct BinOpInfo {
201    ComplexPairTy LHS;
202    ComplexPairTy RHS;
203    QualType Ty;  // Computation Type.
204  };
205
206  BinOpInfo EmitBinOps(const BinaryOperator *E);
207  LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
208                                  ComplexPairTy (ComplexExprEmitter::*Func)
209                                  (const BinOpInfo &),
210                                  ComplexPairTy &Val);
211  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
212                                   ComplexPairTy (ComplexExprEmitter::*Func)
213                                   (const BinOpInfo &));
214
215  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
216  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
217  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
218  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
219
220  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
221    return EmitBinAdd(EmitBinOps(E));
222  }
223  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
224    return EmitBinSub(EmitBinOps(E));
225  }
226  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
227    return EmitBinMul(EmitBinOps(E));
228  }
229  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
230    return EmitBinDiv(EmitBinOps(E));
231  }
232
233  // Compound assignments.
234  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
235    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
236  }
237  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
238    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
239  }
240  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
241    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
242  }
243  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
244    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
245  }
246
247  // GCC rejects rem/and/or/xor for integer complex.
248  // Logical and/or always return int, never complex.
249
250  // No comparisons produce a complex result.
251
252  LValue EmitBinAssignLValue(const BinaryOperator *E,
253                             ComplexPairTy &Val);
254  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
255  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
256
257
258  ComplexPairTy
259  VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
260  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
261
262  ComplexPairTy VisitInitListExpr(InitListExpr *E);
263
264  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
265
266  ComplexPairTy VisitAtomicExpr(AtomicExpr *E) {
267    return CGF.EmitAtomicExpr(E).getComplexVal();
268  }
269};
270}  // end anonymous namespace.
271
272//===----------------------------------------------------------------------===//
273//                                Utilities
274//===----------------------------------------------------------------------===//
275
276/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
277/// load the real and imaginary pieces, returning them as Real/Imag.
278ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
279                                                    bool isVolatile) {
280  llvm::Value *Real=0, *Imag=0;
281
282  if (!IgnoreReal || isVolatile) {
283    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
284                                                 SrcPtr->getName() + ".realp");
285    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
286  }
287
288  if (!IgnoreImag || isVolatile) {
289    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
290                                                 SrcPtr->getName() + ".imagp");
291    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
292  }
293  return ComplexPairTy(Real, Imag);
294}
295
296/// EmitStoreOfComplex - Store the specified real/imag parts into the
297/// specified value pointer.
298void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
299                                            bool isVolatile) {
300  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
301  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
302
303  Builder.CreateStore(Val.first, RealPtr, isVolatile);
304  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
305}
306
307
308
309//===----------------------------------------------------------------------===//
310//                            Visitor Methods
311//===----------------------------------------------------------------------===//
312
313ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
314  CGF.ErrorUnsupported(E, "complex expression");
315  llvm::Type *EltTy =
316  CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
317  llvm::Value *U = llvm::UndefValue::get(EltTy);
318  return ComplexPairTy(U, U);
319}
320
321ComplexPairTy ComplexExprEmitter::
322VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
323  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
324  return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
325}
326
327
328ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
329  if (E->getCallReturnType()->isReferenceType())
330    return EmitLoadOfLValue(E);
331
332  return CGF.EmitCallExpr(E).getComplexVal();
333}
334
335ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
336  CodeGenFunction::StmtExprEvaluation eval(CGF);
337  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
338}
339
340/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
341ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
342                                                           QualType SrcType,
343                                                           QualType DestType) {
344  // Get the src/dest element type.
345  SrcType = SrcType->getAs<ComplexType>()->getElementType();
346  DestType = DestType->getAs<ComplexType>()->getElementType();
347
348  // C99 6.3.1.6: When a value of complex type is converted to another
349  // complex type, both the real and imaginary parts follow the conversion
350  // rules for the corresponding real types.
351  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
352  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
353  return Val;
354}
355
356ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
357                                           QualType DestTy) {
358  switch (CK) {
359  case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
360
361  // Atomic to non-atomic casts may be more than a no-op for some platforms and
362  // for some types.
363  case CK_AtomicToNonAtomic:
364  case CK_NonAtomicToAtomic:
365  case CK_NoOp:
366  case CK_LValueToRValue:
367  case CK_UserDefinedConversion:
368    return Visit(Op);
369
370  case CK_LValueBitCast: {
371    llvm::Value *V = CGF.EmitLValue(Op).getAddress();
372    V = Builder.CreateBitCast(V,
373                    CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
374    // FIXME: Are the qualifiers correct here?
375    return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
376  }
377
378  case CK_BitCast:
379  case CK_BaseToDerived:
380  case CK_DerivedToBase:
381  case CK_UncheckedDerivedToBase:
382  case CK_Dynamic:
383  case CK_ToUnion:
384  case CK_ArrayToPointerDecay:
385  case CK_FunctionToPointerDecay:
386  case CK_NullToPointer:
387  case CK_NullToMemberPointer:
388  case CK_BaseToDerivedMemberPointer:
389  case CK_DerivedToBaseMemberPointer:
390  case CK_MemberPointerToBoolean:
391  case CK_ConstructorConversion:
392  case CK_IntegralToPointer:
393  case CK_PointerToIntegral:
394  case CK_PointerToBoolean:
395  case CK_ToVoid:
396  case CK_VectorSplat:
397  case CK_IntegralCast:
398  case CK_IntegralToBoolean:
399  case CK_IntegralToFloating:
400  case CK_FloatingToIntegral:
401  case CK_FloatingToBoolean:
402  case CK_FloatingCast:
403  case CK_CPointerToObjCPointerCast:
404  case CK_BlockPointerToObjCPointerCast:
405  case CK_AnyPointerToBlockPointerCast:
406  case CK_ObjCObjectLValueCast:
407  case CK_FloatingComplexToReal:
408  case CK_FloatingComplexToBoolean:
409  case CK_IntegralComplexToReal:
410  case CK_IntegralComplexToBoolean:
411  case CK_ARCProduceObject:
412  case CK_ARCConsumeObject:
413  case CK_ARCReclaimReturnedObject:
414  case CK_ARCExtendBlockObject:
415    llvm_unreachable("invalid cast kind for complex value");
416
417  case CK_FloatingRealToComplex:
418  case CK_IntegralRealToComplex: {
419    llvm::Value *Elt = CGF.EmitScalarExpr(Op);
420
421    // Convert the input element to the element type of the complex.
422    DestTy = DestTy->getAs<ComplexType>()->getElementType();
423    Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
424
425    // Return (realval, 0).
426    return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
427  }
428
429  case CK_FloatingComplexCast:
430  case CK_FloatingComplexToIntegralComplex:
431  case CK_IntegralComplexCast:
432  case CK_IntegralComplexToFloatingComplex:
433    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
434  }
435
436  llvm_unreachable("unknown cast resulting in complex value");
437}
438
439ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
440  TestAndClearIgnoreReal();
441  TestAndClearIgnoreImag();
442  ComplexPairTy Op = Visit(E->getSubExpr());
443
444  llvm::Value *ResR, *ResI;
445  if (Op.first->getType()->isFloatingPointTy()) {
446    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
447    ResI = Builder.CreateFNeg(Op.second, "neg.i");
448  } else {
449    ResR = Builder.CreateNeg(Op.first,  "neg.r");
450    ResI = Builder.CreateNeg(Op.second, "neg.i");
451  }
452  return ComplexPairTy(ResR, ResI);
453}
454
455ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
456  TestAndClearIgnoreReal();
457  TestAndClearIgnoreImag();
458  // ~(a+ib) = a + i*-b
459  ComplexPairTy Op = Visit(E->getSubExpr());
460  llvm::Value *ResI;
461  if (Op.second->getType()->isFloatingPointTy())
462    ResI = Builder.CreateFNeg(Op.second, "conj.i");
463  else
464    ResI = Builder.CreateNeg(Op.second, "conj.i");
465
466  return ComplexPairTy(Op.first, ResI);
467}
468
469ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
470  llvm::Value *ResR, *ResI;
471
472  if (Op.LHS.first->getType()->isFloatingPointTy()) {
473    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
474    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
475  } else {
476    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
477    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
478  }
479  return ComplexPairTy(ResR, ResI);
480}
481
482ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
483  llvm::Value *ResR, *ResI;
484  if (Op.LHS.first->getType()->isFloatingPointTy()) {
485    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
486    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
487  } else {
488    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
489    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
490  }
491  return ComplexPairTy(ResR, ResI);
492}
493
494
495ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
496  using llvm::Value;
497  Value *ResR, *ResI;
498
499  if (Op.LHS.first->getType()->isFloatingPointTy()) {
500    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
501    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
502    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
503
504    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
505    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
506    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
507  } else {
508    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
509    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
510    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
511
512    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
513    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
514    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
515  }
516  return ComplexPairTy(ResR, ResI);
517}
518
519ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
520  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
521  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
522
523
524  llvm::Value *DSTr, *DSTi;
525  if (Op.LHS.first->getType()->isFloatingPointTy()) {
526    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
527    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr); // a*c
528    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi); // b*d
529    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2); // ac+bd
530
531    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr); // c*c
532    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi); // d*d
533    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5); // cc+dd
534
535    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr); // b*c
536    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi); // a*d
537    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8); // bc-ad
538
539    DSTr = Builder.CreateFDiv(Tmp3, Tmp6);
540    DSTi = Builder.CreateFDiv(Tmp9, Tmp6);
541  } else {
542    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
543    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
544    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
545    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
546
547    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
548    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
549    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
550
551    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
552    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
553    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
554
555    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
556      DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
557      DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
558    } else {
559      DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
560      DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
561    }
562  }
563
564  return ComplexPairTy(DSTr, DSTi);
565}
566
567ComplexExprEmitter::BinOpInfo
568ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
569  TestAndClearIgnoreReal();
570  TestAndClearIgnoreImag();
571  BinOpInfo Ops;
572  Ops.LHS = Visit(E->getLHS());
573  Ops.RHS = Visit(E->getRHS());
574  Ops.Ty = E->getType();
575  return Ops;
576}
577
578
579LValue ComplexExprEmitter::
580EmitCompoundAssignLValue(const CompoundAssignOperator *E,
581          ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
582                         ComplexPairTy &Val) {
583  TestAndClearIgnoreReal();
584  TestAndClearIgnoreImag();
585  QualType LHSTy = E->getLHS()->getType();
586
587  BinOpInfo OpInfo;
588
589  // Load the RHS and LHS operands.
590  // __block variables need to have the rhs evaluated first, plus this should
591  // improve codegen a little.
592  OpInfo.Ty = E->getComputationResultType();
593
594  // The RHS should have been converted to the computation type.
595  assert(OpInfo.Ty->isAnyComplexType());
596  assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
597                                                 E->getRHS()->getType()));
598  OpInfo.RHS = Visit(E->getRHS());
599
600  LValue LHS = CGF.EmitLValue(E->getLHS());
601
602  // Load from the l-value.
603  ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
604
605  OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
606
607  // Expand the binary operator.
608  ComplexPairTy Result = (this->*Func)(OpInfo);
609
610  // Truncate the result back to the LHS type.
611  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
612  Val = Result;
613
614  // Store the result value into the LHS lvalue.
615  EmitStoreThroughLValue(Result, LHS);
616
617  return LHS;
618}
619
620// Compound assignments.
621ComplexPairTy ComplexExprEmitter::
622EmitCompoundAssign(const CompoundAssignOperator *E,
623                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
624  ComplexPairTy Val;
625  LValue LV = EmitCompoundAssignLValue(E, Func, Val);
626
627  // The result of an assignment in C is the assigned r-value.
628  if (!CGF.getContext().getLangOptions().CPlusPlus)
629    return Val;
630
631  // If the lvalue is non-volatile, return the computed value of the assignment.
632  if (!LV.isVolatileQualified())
633    return Val;
634
635  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
636}
637
638LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
639                                               ComplexPairTy &Val) {
640  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
641                                                 E->getRHS()->getType()) &&
642         "Invalid assignment");
643  TestAndClearIgnoreReal();
644  TestAndClearIgnoreImag();
645
646  // Emit the RHS.  __block variables need the RHS evaluated first.
647  Val = Visit(E->getRHS());
648
649  // Compute the address to store into.
650  LValue LHS = CGF.EmitLValue(E->getLHS());
651
652  // Store the result value into the LHS lvalue.
653  EmitStoreThroughLValue(Val, LHS);
654
655  return LHS;
656}
657
658ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
659  ComplexPairTy Val;
660  LValue LV = EmitBinAssignLValue(E, Val);
661
662  // The result of an assignment in C is the assigned r-value.
663  if (!CGF.getContext().getLangOptions().CPlusPlus)
664    return Val;
665
666  // If the lvalue is non-volatile, return the computed value of the assignment.
667  if (!LV.isVolatileQualified())
668    return Val;
669
670  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
671}
672
673ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
674  CGF.EmitIgnoredExpr(E->getLHS());
675  return Visit(E->getRHS());
676}
677
678ComplexPairTy ComplexExprEmitter::
679VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
680  TestAndClearIgnoreReal();
681  TestAndClearIgnoreImag();
682  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
683  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
684  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
685
686  // Bind the common expression if necessary.
687  CodeGenFunction::OpaqueValueMapping binding(CGF, E);
688
689  CodeGenFunction::ConditionalEvaluation eval(CGF);
690  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
691
692  eval.begin(CGF);
693  CGF.EmitBlock(LHSBlock);
694  ComplexPairTy LHS = Visit(E->getTrueExpr());
695  LHSBlock = Builder.GetInsertBlock();
696  CGF.EmitBranch(ContBlock);
697  eval.end(CGF);
698
699  eval.begin(CGF);
700  CGF.EmitBlock(RHSBlock);
701  ComplexPairTy RHS = Visit(E->getFalseExpr());
702  RHSBlock = Builder.GetInsertBlock();
703  CGF.EmitBlock(ContBlock);
704  eval.end(CGF);
705
706  // Create a PHI node for the real part.
707  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
708  RealPN->addIncoming(LHS.first, LHSBlock);
709  RealPN->addIncoming(RHS.first, RHSBlock);
710
711  // Create a PHI node for the imaginary part.
712  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
713  ImagPN->addIncoming(LHS.second, LHSBlock);
714  ImagPN->addIncoming(RHS.second, RHSBlock);
715
716  return ComplexPairTy(RealPN, ImagPN);
717}
718
719ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
720  return Visit(E->getChosenSubExpr(CGF.getContext()));
721}
722
723ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
724    bool Ignore = TestAndClearIgnoreReal();
725    (void)Ignore;
726    assert (Ignore == false && "init list ignored");
727    Ignore = TestAndClearIgnoreImag();
728    (void)Ignore;
729    assert (Ignore == false && "init list ignored");
730
731  if (E->getNumInits() == 2) {
732    llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
733    llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
734    return ComplexPairTy(Real, Imag);
735  } else if (E->getNumInits() == 1) {
736    return Visit(E->getInit(0));
737  }
738
739  // Empty init list intializes to null
740  assert(E->getNumInits() == 0 && "Unexpected number of inits");
741  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
742  llvm::Type* LTy = CGF.ConvertType(Ty);
743  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
744  return ComplexPairTy(zeroConstant, zeroConstant);
745}
746
747ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
748  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
749  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
750
751  if (!ArgPtr) {
752    CGF.ErrorUnsupported(E, "complex va_arg expression");
753    llvm::Type *EltTy =
754      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
755    llvm::Value *U = llvm::UndefValue::get(EltTy);
756    return ComplexPairTy(U, U);
757  }
758
759  // FIXME Volatility.
760  return EmitLoadOfComplex(ArgPtr, false);
761}
762
763//===----------------------------------------------------------------------===//
764//                         Entry Point into this File
765//===----------------------------------------------------------------------===//
766
767/// EmitComplexExpr - Emit the computation of the specified expression of
768/// complex type, ignoring the result.
769ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
770                                               bool IgnoreImag) {
771  assert(E && E->getType()->isAnyComplexType() &&
772         "Invalid complex expression to emit");
773
774  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
775    .Visit(const_cast<Expr*>(E));
776}
777
778/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
779/// of complex type, storing into the specified Value*.
780void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
781                                              llvm::Value *DestAddr,
782                                              bool DestIsVolatile) {
783  assert(E && E->getType()->isAnyComplexType() &&
784         "Invalid complex expression to emit");
785  ComplexExprEmitter Emitter(*this);
786  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
787  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
788}
789
790/// StoreComplexToAddr - Store a complex number into the specified address.
791void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
792                                         llvm::Value *DestAddr,
793                                         bool DestIsVolatile) {
794  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
795}
796
797/// LoadComplexFromAddr - Load a complex number from the specified address.
798ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
799                                                   bool SrcIsVolatile) {
800  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
801}
802
803LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
804  assert(E->getOpcode() == BO_Assign);
805  ComplexPairTy Val; // ignored
806  return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
807}
808
809LValue CodeGenFunction::
810EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
811  ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
812  switch (E->getOpcode()) {
813  case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
814  case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
815  case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
816  case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
817
818  default:
819    llvm_unreachable("unexpected complex compound assignment");
820    Op = 0;
821  }
822
823  ComplexPairTy Val; // ignored
824  return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
825}
826