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(DeclRefExpr *E) {
115    if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
116      if (result.isReference())
117        return EmitLoadOfLValue(result.getReferenceLValue(CGF, E));
118
119      llvm::ConstantStruct *pair =
120        cast<llvm::ConstantStruct>(result.getValue());
121      return ComplexPairTy(pair->getOperand(0), pair->getOperand(1));
122    }
123    return EmitLoadOfLValue(E);
124  }
125  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
126    return EmitLoadOfLValue(E);
127  }
128  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
129    return CGF.EmitObjCMessageExpr(E).getComplexVal();
130  }
131  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
132  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
133  ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
134    if (E->isGLValue())
135      return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
136    return CGF.getOpaqueRValueMapping(E).getComplexVal();
137  }
138
139  ComplexPairTy VisitPseudoObjectExpr(PseudoObjectExpr *E) {
140    return CGF.EmitPseudoObjectRValue(E).getComplexVal();
141  }
142
143  // FIXME: CompoundLiteralExpr
144
145  ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
146  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
147    // Unlike for scalars, we don't have to worry about function->ptr demotion
148    // here.
149    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
150  }
151  ComplexPairTy VisitCastExpr(CastExpr *E) {
152    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
153  }
154  ComplexPairTy VisitCallExpr(const CallExpr *E);
155  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
156
157  // Operators.
158  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
159                                   bool isInc, bool isPre) {
160    LValue LV = CGF.EmitLValue(E->getSubExpr());
161    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
162  }
163  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
164    return VisitPrePostIncDec(E, false, false);
165  }
166  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
167    return VisitPrePostIncDec(E, true, false);
168  }
169  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
170    return VisitPrePostIncDec(E, false, true);
171  }
172  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
173    return VisitPrePostIncDec(E, true, true);
174  }
175  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
176  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
177    TestAndClearIgnoreReal();
178    TestAndClearIgnoreImag();
179    return Visit(E->getSubExpr());
180  }
181  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
182  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
183  // LNot,Real,Imag never return complex.
184  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
185    return Visit(E->getSubExpr());
186  }
187  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
188    return Visit(DAE->getExpr());
189  }
190  ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
191    CGF.enterFullExpression(E);
192    CodeGenFunction::RunCleanupsScope Scope(CGF);
193    return Visit(E->getSubExpr());
194  }
195  ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
196    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
197    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
198    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
199    return ComplexPairTy(Null, Null);
200  }
201  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
202    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
203    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
204    llvm::Constant *Null =
205                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
206    return ComplexPairTy(Null, Null);
207  }
208
209  struct BinOpInfo {
210    ComplexPairTy LHS;
211    ComplexPairTy RHS;
212    QualType Ty;  // Computation Type.
213  };
214
215  BinOpInfo EmitBinOps(const BinaryOperator *E);
216  LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
217                                  ComplexPairTy (ComplexExprEmitter::*Func)
218                                  (const BinOpInfo &),
219                                  ComplexPairTy &Val);
220  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
221                                   ComplexPairTy (ComplexExprEmitter::*Func)
222                                   (const BinOpInfo &));
223
224  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
225  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
226  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
227  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
228
229  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
230    return EmitBinAdd(EmitBinOps(E));
231  }
232  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
233    return EmitBinSub(EmitBinOps(E));
234  }
235  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
236    return EmitBinMul(EmitBinOps(E));
237  }
238  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
239    return EmitBinDiv(EmitBinOps(E));
240  }
241
242  // Compound assignments.
243  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
244    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
245  }
246  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
247    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
248  }
249  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
250    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
251  }
252  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
253    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
254  }
255
256  // GCC rejects rem/and/or/xor for integer complex.
257  // Logical and/or always return int, never complex.
258
259  // No comparisons produce a complex result.
260
261  LValue EmitBinAssignLValue(const BinaryOperator *E,
262                             ComplexPairTy &Val);
263  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
264  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
265
266
267  ComplexPairTy
268  VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
269  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
270
271  ComplexPairTy VisitInitListExpr(InitListExpr *E);
272
273  ComplexPairTy VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
274    return EmitLoadOfLValue(E);
275  }
276
277  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
278
279  ComplexPairTy VisitAtomicExpr(AtomicExpr *E) {
280    return CGF.EmitAtomicExpr(E).getComplexVal();
281  }
282};
283}  // end anonymous namespace.
284
285//===----------------------------------------------------------------------===//
286//                                Utilities
287//===----------------------------------------------------------------------===//
288
289/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
290/// load the real and imaginary pieces, returning them as Real/Imag.
291ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
292                                                    bool isVolatile) {
293  llvm::Value *Real=0, *Imag=0;
294
295  if (!IgnoreReal || isVolatile) {
296    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
297                                                 SrcPtr->getName() + ".realp");
298    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
299  }
300
301  if (!IgnoreImag || isVolatile) {
302    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
303                                                 SrcPtr->getName() + ".imagp");
304    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
305  }
306  return ComplexPairTy(Real, Imag);
307}
308
309/// EmitStoreOfComplex - Store the specified real/imag parts into the
310/// specified value pointer.
311void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
312                                            bool isVolatile) {
313  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
314  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
315
316  Builder.CreateStore(Val.first, RealPtr, isVolatile);
317  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
318}
319
320
321
322//===----------------------------------------------------------------------===//
323//                            Visitor Methods
324//===----------------------------------------------------------------------===//
325
326ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
327  CGF.ErrorUnsupported(E, "complex expression");
328  llvm::Type *EltTy =
329  CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
330  llvm::Value *U = llvm::UndefValue::get(EltTy);
331  return ComplexPairTy(U, U);
332}
333
334ComplexPairTy ComplexExprEmitter::
335VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
336  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
337  return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
338}
339
340
341ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
342  if (E->getCallReturnType()->isReferenceType())
343    return EmitLoadOfLValue(E);
344
345  return CGF.EmitCallExpr(E).getComplexVal();
346}
347
348ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
349  CodeGenFunction::StmtExprEvaluation eval(CGF);
350  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
351}
352
353/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
354ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
355                                                           QualType SrcType,
356                                                           QualType DestType) {
357  // Get the src/dest element type.
358  SrcType = SrcType->getAs<ComplexType>()->getElementType();
359  DestType = DestType->getAs<ComplexType>()->getElementType();
360
361  // C99 6.3.1.6: When a value of complex type is converted to another
362  // complex type, both the real and imaginary parts follow the conversion
363  // rules for the corresponding real types.
364  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
365  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
366  return Val;
367}
368
369ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
370                                           QualType DestTy) {
371  switch (CK) {
372  case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
373
374  // Atomic to non-atomic casts may be more than a no-op for some platforms and
375  // for some types.
376  case CK_AtomicToNonAtomic:
377  case CK_NonAtomicToAtomic:
378  case CK_NoOp:
379  case CK_LValueToRValue:
380  case CK_UserDefinedConversion:
381    return Visit(Op);
382
383  case CK_LValueBitCast: {
384    llvm::Value *V = CGF.EmitLValue(Op).getAddress();
385    V = Builder.CreateBitCast(V,
386                    CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
387    // FIXME: Are the qualifiers correct here?
388    return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
389  }
390
391  case CK_BitCast:
392  case CK_BaseToDerived:
393  case CK_DerivedToBase:
394  case CK_UncheckedDerivedToBase:
395  case CK_Dynamic:
396  case CK_ToUnion:
397  case CK_ArrayToPointerDecay:
398  case CK_FunctionToPointerDecay:
399  case CK_NullToPointer:
400  case CK_NullToMemberPointer:
401  case CK_BaseToDerivedMemberPointer:
402  case CK_DerivedToBaseMemberPointer:
403  case CK_MemberPointerToBoolean:
404  case CK_ReinterpretMemberPointer:
405  case CK_ConstructorConversion:
406  case CK_IntegralToPointer:
407  case CK_PointerToIntegral:
408  case CK_PointerToBoolean:
409  case CK_ToVoid:
410  case CK_VectorSplat:
411  case CK_IntegralCast:
412  case CK_IntegralToBoolean:
413  case CK_IntegralToFloating:
414  case CK_FloatingToIntegral:
415  case CK_FloatingToBoolean:
416  case CK_FloatingCast:
417  case CK_CPointerToObjCPointerCast:
418  case CK_BlockPointerToObjCPointerCast:
419  case CK_AnyPointerToBlockPointerCast:
420  case CK_ObjCObjectLValueCast:
421  case CK_FloatingComplexToReal:
422  case CK_FloatingComplexToBoolean:
423  case CK_IntegralComplexToReal:
424  case CK_IntegralComplexToBoolean:
425  case CK_ARCProduceObject:
426  case CK_ARCConsumeObject:
427  case CK_ARCReclaimReturnedObject:
428  case CK_ARCExtendBlockObject:
429  case CK_CopyAndAutoreleaseBlockObject:
430  case CK_BuiltinFnToFnPtr:
431    llvm_unreachable("invalid cast kind for complex value");
432
433  case CK_FloatingRealToComplex:
434  case CK_IntegralRealToComplex: {
435    llvm::Value *Elt = CGF.EmitScalarExpr(Op);
436
437    // Convert the input element to the element type of the complex.
438    DestTy = DestTy->getAs<ComplexType>()->getElementType();
439    Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
440
441    // Return (realval, 0).
442    return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
443  }
444
445  case CK_FloatingComplexCast:
446  case CK_FloatingComplexToIntegralComplex:
447  case CK_IntegralComplexCast:
448  case CK_IntegralComplexToFloatingComplex:
449    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
450  }
451
452  llvm_unreachable("unknown cast resulting in complex value");
453}
454
455ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
456  TestAndClearIgnoreReal();
457  TestAndClearIgnoreImag();
458  ComplexPairTy Op = Visit(E->getSubExpr());
459
460  llvm::Value *ResR, *ResI;
461  if (Op.first->getType()->isFloatingPointTy()) {
462    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
463    ResI = Builder.CreateFNeg(Op.second, "neg.i");
464  } else {
465    ResR = Builder.CreateNeg(Op.first,  "neg.r");
466    ResI = Builder.CreateNeg(Op.second, "neg.i");
467  }
468  return ComplexPairTy(ResR, ResI);
469}
470
471ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
472  TestAndClearIgnoreReal();
473  TestAndClearIgnoreImag();
474  // ~(a+ib) = a + i*-b
475  ComplexPairTy Op = Visit(E->getSubExpr());
476  llvm::Value *ResI;
477  if (Op.second->getType()->isFloatingPointTy())
478    ResI = Builder.CreateFNeg(Op.second, "conj.i");
479  else
480    ResI = Builder.CreateNeg(Op.second, "conj.i");
481
482  return ComplexPairTy(Op.first, ResI);
483}
484
485ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
486  llvm::Value *ResR, *ResI;
487
488  if (Op.LHS.first->getType()->isFloatingPointTy()) {
489    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
490    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
491  } else {
492    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
493    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
494  }
495  return ComplexPairTy(ResR, ResI);
496}
497
498ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
499  llvm::Value *ResR, *ResI;
500  if (Op.LHS.first->getType()->isFloatingPointTy()) {
501    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
502    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
503  } else {
504    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
505    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
506  }
507  return ComplexPairTy(ResR, ResI);
508}
509
510
511ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
512  using llvm::Value;
513  Value *ResR, *ResI;
514
515  if (Op.LHS.first->getType()->isFloatingPointTy()) {
516    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
517    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
518    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
519
520    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
521    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
522    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
523  } else {
524    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
525    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
526    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
527
528    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
529    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
530    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
531  }
532  return ComplexPairTy(ResR, ResI);
533}
534
535ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
536  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
537  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
538
539
540  llvm::Value *DSTr, *DSTi;
541  if (Op.LHS.first->getType()->isFloatingPointTy()) {
542    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
543    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr); // a*c
544    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi); // b*d
545    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2); // ac+bd
546
547    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr); // c*c
548    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi); // d*d
549    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5); // cc+dd
550
551    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr); // b*c
552    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi); // a*d
553    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8); // bc-ad
554
555    DSTr = Builder.CreateFDiv(Tmp3, Tmp6);
556    DSTi = Builder.CreateFDiv(Tmp9, Tmp6);
557  } else {
558    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
559    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
560    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
561    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
562
563    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
564    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
565    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
566
567    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
568    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
569    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
570
571    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
572      DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
573      DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
574    } else {
575      DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
576      DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
577    }
578  }
579
580  return ComplexPairTy(DSTr, DSTi);
581}
582
583ComplexExprEmitter::BinOpInfo
584ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
585  TestAndClearIgnoreReal();
586  TestAndClearIgnoreImag();
587  BinOpInfo Ops;
588  Ops.LHS = Visit(E->getLHS());
589  Ops.RHS = Visit(E->getRHS());
590  Ops.Ty = E->getType();
591  return Ops;
592}
593
594
595LValue ComplexExprEmitter::
596EmitCompoundAssignLValue(const CompoundAssignOperator *E,
597          ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
598                         ComplexPairTy &Val) {
599  TestAndClearIgnoreReal();
600  TestAndClearIgnoreImag();
601  QualType LHSTy = E->getLHS()->getType();
602
603  BinOpInfo OpInfo;
604
605  // Load the RHS and LHS operands.
606  // __block variables need to have the rhs evaluated first, plus this should
607  // improve codegen a little.
608  OpInfo.Ty = E->getComputationResultType();
609
610  // The RHS should have been converted to the computation type.
611  assert(OpInfo.Ty->isAnyComplexType());
612  assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
613                                                 E->getRHS()->getType()));
614  OpInfo.RHS = Visit(E->getRHS());
615
616  LValue LHS = CGF.EmitLValue(E->getLHS());
617
618  // Load from the l-value.
619  ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
620
621  OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
622
623  // Expand the binary operator.
624  ComplexPairTy Result = (this->*Func)(OpInfo);
625
626  // Truncate the result back to the LHS type.
627  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
628  Val = Result;
629
630  // Store the result value into the LHS lvalue.
631  EmitStoreThroughLValue(Result, LHS);
632
633  return LHS;
634}
635
636// Compound assignments.
637ComplexPairTy ComplexExprEmitter::
638EmitCompoundAssign(const CompoundAssignOperator *E,
639                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
640  ComplexPairTy Val;
641  LValue LV = EmitCompoundAssignLValue(E, Func, Val);
642
643  // The result of an assignment in C is the assigned r-value.
644  if (!CGF.getContext().getLangOpts().CPlusPlus)
645    return Val;
646
647  // If the lvalue is non-volatile, return the computed value of the assignment.
648  if (!LV.isVolatileQualified())
649    return Val;
650
651  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
652}
653
654LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
655                                               ComplexPairTy &Val) {
656  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
657                                                 E->getRHS()->getType()) &&
658         "Invalid assignment");
659  TestAndClearIgnoreReal();
660  TestAndClearIgnoreImag();
661
662  // Emit the RHS.  __block variables need the RHS evaluated first.
663  Val = Visit(E->getRHS());
664
665  // Compute the address to store into.
666  LValue LHS = CGF.EmitLValue(E->getLHS());
667
668  // Store the result value into the LHS lvalue.
669  EmitStoreThroughLValue(Val, LHS);
670
671  return LHS;
672}
673
674ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
675  ComplexPairTy Val;
676  LValue LV = EmitBinAssignLValue(E, Val);
677
678  // The result of an assignment in C is the assigned r-value.
679  if (!CGF.getContext().getLangOpts().CPlusPlus)
680    return Val;
681
682  // If the lvalue is non-volatile, return the computed value of the assignment.
683  if (!LV.isVolatileQualified())
684    return Val;
685
686  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
687}
688
689ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
690  CGF.EmitIgnoredExpr(E->getLHS());
691  return Visit(E->getRHS());
692}
693
694ComplexPairTy ComplexExprEmitter::
695VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
696  TestAndClearIgnoreReal();
697  TestAndClearIgnoreImag();
698  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
699  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
700  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
701
702  // Bind the common expression if necessary.
703  CodeGenFunction::OpaqueValueMapping binding(CGF, E);
704
705  CodeGenFunction::ConditionalEvaluation eval(CGF);
706  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
707
708  eval.begin(CGF);
709  CGF.EmitBlock(LHSBlock);
710  ComplexPairTy LHS = Visit(E->getTrueExpr());
711  LHSBlock = Builder.GetInsertBlock();
712  CGF.EmitBranch(ContBlock);
713  eval.end(CGF);
714
715  eval.begin(CGF);
716  CGF.EmitBlock(RHSBlock);
717  ComplexPairTy RHS = Visit(E->getFalseExpr());
718  RHSBlock = Builder.GetInsertBlock();
719  CGF.EmitBlock(ContBlock);
720  eval.end(CGF);
721
722  // Create a PHI node for the real part.
723  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
724  RealPN->addIncoming(LHS.first, LHSBlock);
725  RealPN->addIncoming(RHS.first, RHSBlock);
726
727  // Create a PHI node for the imaginary part.
728  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
729  ImagPN->addIncoming(LHS.second, LHSBlock);
730  ImagPN->addIncoming(RHS.second, RHSBlock);
731
732  return ComplexPairTy(RealPN, ImagPN);
733}
734
735ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
736  return Visit(E->getChosenSubExpr(CGF.getContext()));
737}
738
739ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
740    bool Ignore = TestAndClearIgnoreReal();
741    (void)Ignore;
742    assert (Ignore == false && "init list ignored");
743    Ignore = TestAndClearIgnoreImag();
744    (void)Ignore;
745    assert (Ignore == false && "init list ignored");
746
747  if (E->getNumInits() == 2) {
748    llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
749    llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
750    return ComplexPairTy(Real, Imag);
751  } else if (E->getNumInits() == 1) {
752    return Visit(E->getInit(0));
753  }
754
755  // Empty init list intializes to null
756  assert(E->getNumInits() == 0 && "Unexpected number of inits");
757  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
758  llvm::Type* LTy = CGF.ConvertType(Ty);
759  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
760  return ComplexPairTy(zeroConstant, zeroConstant);
761}
762
763ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
764  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
765  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
766
767  if (!ArgPtr) {
768    CGF.ErrorUnsupported(E, "complex va_arg expression");
769    llvm::Type *EltTy =
770      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
771    llvm::Value *U = llvm::UndefValue::get(EltTy);
772    return ComplexPairTy(U, U);
773  }
774
775  // FIXME Volatility.
776  return EmitLoadOfComplex(ArgPtr, false);
777}
778
779//===----------------------------------------------------------------------===//
780//                         Entry Point into this File
781//===----------------------------------------------------------------------===//
782
783/// EmitComplexExpr - Emit the computation of the specified expression of
784/// complex type, ignoring the result.
785ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
786                                               bool IgnoreImag) {
787  assert(E && E->getType()->isAnyComplexType() &&
788         "Invalid complex expression to emit");
789
790  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
791    .Visit(const_cast<Expr*>(E));
792}
793
794/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
795/// of complex type, storing into the specified Value*.
796void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
797                                              llvm::Value *DestAddr,
798                                              bool DestIsVolatile) {
799  assert(E && E->getType()->isAnyComplexType() &&
800         "Invalid complex expression to emit");
801  ComplexExprEmitter Emitter(*this);
802  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
803  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
804}
805
806/// StoreComplexToAddr - Store a complex number into the specified address.
807void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
808                                         llvm::Value *DestAddr,
809                                         bool DestIsVolatile) {
810  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
811}
812
813/// LoadComplexFromAddr - Load a complex number from the specified address.
814ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
815                                                   bool SrcIsVolatile) {
816  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
817}
818
819LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
820  assert(E->getOpcode() == BO_Assign);
821  ComplexPairTy Val; // ignored
822  return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
823}
824
825LValue CodeGenFunction::
826EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
827  ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
828  switch (E->getOpcode()) {
829  case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
830  case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
831  case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
832  case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
833
834  default:
835    llvm_unreachable("unexpected complex compound assignment");
836  }
837
838  ComplexPairTy Val; // ignored
839  return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
840}
841