CGExprComplex.cpp revision dfb1eb208e401a0e5ecf2910e1a73b09aa69fd26 
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;
38  // True if we should ignore the value of a=b
39  bool IgnoreRealAssign;
40  bool IgnoreImagAssign;
41public:
42  ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false,
43                     bool irn=false, bool iin=false)
44    : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii),
45    IgnoreRealAssign(irn), IgnoreImagAssign(iin) {
46  }
47
48
49  //===--------------------------------------------------------------------===//
50  //                               Utilities
51  //===--------------------------------------------------------------------===//
52
53  bool TestAndClearIgnoreReal() {
54    bool I = IgnoreReal;
55    IgnoreReal = false;
56    return I;
57  }
58  bool TestAndClearIgnoreImag() {
59    bool I = IgnoreImag;
60    IgnoreImag = false;
61    return I;
62  }
63  bool TestAndClearIgnoreRealAssign() {
64    bool I = IgnoreRealAssign;
65    IgnoreRealAssign = false;
66    return I;
67  }
68  bool TestAndClearIgnoreImagAssign() {
69    bool I = IgnoreImagAssign;
70    IgnoreImagAssign = false;
71    return I;
72  }
73
74  /// EmitLoadOfLValue - Given an expression with complex type that represents a
75  /// value l-value, this method emits the address of the l-value, then loads
76  /// and returns the result.
77  ComplexPairTy EmitLoadOfLValue(const Expr *E) {
78    LValue LV = CGF.EmitLValue(E);
79    if (LV.isSimple())
80      return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
81
82    if (LV.isPropertyRef())
83      return CGF.EmitObjCPropertyGet(LV.getPropertyRefExpr()).getComplexVal();
84
85    assert(LV.isKVCRef() && "Unknown LValue type!");
86    return CGF.EmitObjCPropertyGet(LV.getKVCRefExpr()).getComplexVal();
87  }
88
89  /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
90  /// the real and imaginary pieces.
91  ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
92
93  /// EmitStoreOfComplex - Store the specified real/imag parts into the
94  /// specified value pointer.
95  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
96
97  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
98  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
99                                         QualType DestType);
100
101  //===--------------------------------------------------------------------===//
102  //                            Visitor Methods
103  //===--------------------------------------------------------------------===//
104
105  ComplexPairTy VisitStmt(Stmt *S) {
106    S->dump(CGF.getContext().getSourceManager());
107    assert(0 && "Stmt can't have complex result type!");
108    return ComplexPairTy();
109  }
110  ComplexPairTy VisitExpr(Expr *S);
111  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
112  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
113
114  // l-values.
115  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
116  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
117    return EmitLoadOfLValue(E);
118  }
119  ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
120    return EmitLoadOfLValue(E);
121  }
122  ComplexPairTy VisitObjCImplicitSetterGetterRefExpr(
123                               ObjCImplicitSetterGetterRefExpr *E) {
124    return EmitLoadOfLValue(E);
125  }
126  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
127    return CGF.EmitObjCMessageExpr(E).getComplexVal();
128  }
129  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
130  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
131
132  // FIXME: CompoundLiteralExpr
133
134  ComplexPairTy EmitCast(Expr *Op, QualType DestTy);
135  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
136    // Unlike for scalars, we don't have to worry about function->ptr demotion
137    // here.
138    return EmitCast(E->getSubExpr(), E->getType());
139  }
140  ComplexPairTy VisitCastExpr(CastExpr *E) {
141    return EmitCast(E->getSubExpr(), E->getType());
142  }
143  ComplexPairTy VisitCallExpr(const CallExpr *E);
144  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
145
146  // Operators.
147  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
148                                   bool isInc, bool isPre) {
149    LValue LV = CGF.EmitLValue(E->getSubExpr());
150    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
151  }
152  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
153    return VisitPrePostIncDec(E, false, false);
154  }
155  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
156    return VisitPrePostIncDec(E, true, false);
157  }
158  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
159    return VisitPrePostIncDec(E, false, true);
160  }
161  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
162    return VisitPrePostIncDec(E, true, true);
163  }
164  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
165  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
166    TestAndClearIgnoreReal();
167    TestAndClearIgnoreImag();
168    TestAndClearIgnoreRealAssign();
169    TestAndClearIgnoreImagAssign();
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 VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
182    return CGF.EmitCXXExprWithTemporaries(E).getComplexVal();
183  }
184  ComplexPairTy VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
185    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
186    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
187    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
188    return ComplexPairTy(Null, Null);
189  }
190  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
191    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
192    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
193    llvm::Constant *Null =
194                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
195    return ComplexPairTy(Null, Null);
196  }
197
198  struct BinOpInfo {
199    ComplexPairTy LHS;
200    ComplexPairTy RHS;
201    QualType Ty;  // Computation Type.
202  };
203
204  BinOpInfo EmitBinOps(const BinaryOperator *E);
205  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
206                                   ComplexPairTy (ComplexExprEmitter::*Func)
207                                   (const BinOpInfo &));
208
209  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
210  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
211  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
212  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
213
214  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
215    return EmitBinMul(EmitBinOps(E));
216  }
217  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
218    return EmitBinAdd(EmitBinOps(E));
219  }
220  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
221    return EmitBinSub(EmitBinOps(E));
222  }
223  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
224    return EmitBinDiv(EmitBinOps(E));
225  }
226
227  // Compound assignments.
228  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
229    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
230  }
231  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
232    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
233  }
234  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
235    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
236  }
237  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
238    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
239  }
240
241  // GCC rejects rem/and/or/xor for integer complex.
242  // Logical and/or always return int, never complex.
243
244  // No comparisons produce a complex result.
245  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
246  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
247
248
249  ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
250  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
251
252  ComplexPairTy VisitInitListExpr(InitListExpr *E);
253
254  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
255};
256}  // end anonymous namespace.
257
258//===----------------------------------------------------------------------===//
259//                                Utilities
260//===----------------------------------------------------------------------===//
261
262/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
263/// load the real and imaginary pieces, returning them as Real/Imag.
264ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
265                                                    bool isVolatile) {
266  llvm::Value *Real=0, *Imag=0;
267
268  if (!IgnoreReal) {
269    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
270                                                 SrcPtr->getName() + ".realp");
271    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
272  }
273
274  if (!IgnoreImag) {
275    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
276                                                 SrcPtr->getName() + ".imagp");
277    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
278  }
279  return ComplexPairTy(Real, Imag);
280}
281
282/// EmitStoreOfComplex - Store the specified real/imag parts into the
283/// specified value pointer.
284void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
285                                            bool isVolatile) {
286  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
287  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
288
289  Builder.CreateStore(Val.first, RealPtr, isVolatile);
290  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
291}
292
293
294
295//===----------------------------------------------------------------------===//
296//                            Visitor Methods
297//===----------------------------------------------------------------------===//
298
299ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
300  CGF.ErrorUnsupported(E, "complex expression");
301  const llvm::Type *EltTy =
302    CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
303  llvm::Value *U = llvm::UndefValue::get(EltTy);
304  return ComplexPairTy(U, U);
305}
306
307ComplexPairTy ComplexExprEmitter::
308VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
309  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
310  return
311        ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
312}
313
314
315ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
316  if (E->getCallReturnType()->isReferenceType())
317    return EmitLoadOfLValue(E);
318
319  return CGF.EmitCallExpr(E).getComplexVal();
320}
321
322ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
323  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
324}
325
326/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
327ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
328                                                           QualType SrcType,
329                                                           QualType DestType) {
330  // Get the src/dest element type.
331  SrcType = SrcType->getAs<ComplexType>()->getElementType();
332  DestType = DestType->getAs<ComplexType>()->getElementType();
333
334  // C99 6.3.1.6: When a value of complex type is converted to another
335  // complex type, both the real and imaginary parts follow the conversion
336  // rules for the corresponding real types.
337  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
338  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
339  return Val;
340}
341
342ComplexPairTy ComplexExprEmitter::EmitCast(Expr *Op, QualType DestTy) {
343  // Two cases here: cast from (complex to complex) and (scalar to complex).
344  if (Op->getType()->isAnyComplexType())
345    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
346
347  // C99 6.3.1.7: When a value of real type is converted to a complex type, the
348  // real part of the complex result value is determined by the rules of
349  // conversion to the corresponding real type and the imaginary part of the
350  // complex result value is a positive zero or an unsigned zero.
351  llvm::Value *Elt = CGF.EmitScalarExpr(Op);
352
353  // Convert the input element to the element type of the complex.
354  DestTy = DestTy->getAs<ComplexType>()->getElementType();
355  Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
356
357  // Return (realval, 0).
358  return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
359}
360
361ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
362  TestAndClearIgnoreReal();
363  TestAndClearIgnoreImag();
364  TestAndClearIgnoreRealAssign();
365  TestAndClearIgnoreImagAssign();
366  ComplexPairTy Op = Visit(E->getSubExpr());
367
368  llvm::Value *ResR, *ResI;
369  if (Op.first->getType()->isFloatingPointTy()) {
370    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
371    ResI = Builder.CreateFNeg(Op.second, "neg.i");
372  } else {
373    ResR = Builder.CreateNeg(Op.first,  "neg.r");
374    ResI = Builder.CreateNeg(Op.second, "neg.i");
375  }
376  return ComplexPairTy(ResR, ResI);
377}
378
379ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
380  TestAndClearIgnoreReal();
381  TestAndClearIgnoreImag();
382  TestAndClearIgnoreRealAssign();
383  TestAndClearIgnoreImagAssign();
384  // ~(a+ib) = a + i*-b
385  ComplexPairTy Op = Visit(E->getSubExpr());
386  llvm::Value *ResI;
387  if (Op.second->getType()->isFloatingPointTy())
388    ResI = Builder.CreateFNeg(Op.second, "conj.i");
389  else
390    ResI = Builder.CreateNeg(Op.second, "conj.i");
391
392  return ComplexPairTy(Op.first, ResI);
393}
394
395ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
396  llvm::Value *ResR, *ResI;
397
398  if (Op.LHS.first->getType()->isFloatingPointTy()) {
399    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
400    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
401  } else {
402    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
403    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
404  }
405  return ComplexPairTy(ResR, ResI);
406}
407
408ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
409  llvm::Value *ResR, *ResI;
410  if (Op.LHS.first->getType()->isFloatingPointTy()) {
411    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
412    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
413  } else {
414    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
415    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
416  }
417  return ComplexPairTy(ResR, ResI);
418}
419
420
421ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
422  using llvm::Value;
423  Value *ResR, *ResI;
424
425  if (Op.LHS.first->getType()->isFloatingPointTy()) {
426    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
427    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
428    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
429
430    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
431    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
432    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
433  } else {
434    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
435    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
436    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
437
438    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
439    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
440    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
441  }
442  return ComplexPairTy(ResR, ResI);
443}
444
445ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
446  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
447  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
448
449
450  llvm::Value *DSTr, *DSTi;
451  if (Op.LHS.first->getType()->isFloatingPointTy()) {
452    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
453    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
454    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
455    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
456
457    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
458    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
459    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
460
461    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
462    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
463    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
464
465    DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
466    DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
467  } else {
468    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
469    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
470    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
471    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
472
473    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
474    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
475    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
476
477    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
478    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
479    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
480
481    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
482      DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
483      DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
484    } else {
485      DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
486      DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
487    }
488  }
489
490  return ComplexPairTy(DSTr, DSTi);
491}
492
493ComplexExprEmitter::BinOpInfo
494ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
495  TestAndClearIgnoreReal();
496  TestAndClearIgnoreImag();
497  TestAndClearIgnoreRealAssign();
498  TestAndClearIgnoreImagAssign();
499  BinOpInfo Ops;
500  Ops.LHS = Visit(E->getLHS());
501  Ops.RHS = Visit(E->getRHS());
502  Ops.Ty = E->getType();
503  return Ops;
504}
505
506
507// Compound assignments.
508ComplexPairTy ComplexExprEmitter::
509EmitCompoundAssign(const CompoundAssignOperator *E,
510                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
511  TestAndClearIgnoreReal();
512  TestAndClearIgnoreImag();
513  bool ignreal = TestAndClearIgnoreRealAssign();
514  bool ignimag = TestAndClearIgnoreImagAssign();
515  QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType();
516
517  BinOpInfo OpInfo;
518
519  // Load the RHS and LHS operands.
520  // __block variables need to have the rhs evaluated first, plus this should
521  // improve codegen a little.  It is possible for the RHS to be complex or
522  // scalar.
523  OpInfo.Ty = E->getComputationResultType();
524  OpInfo.RHS = EmitCast(E->getRHS(), OpInfo.Ty);
525
526  LValue LHSLV = CGF.EmitLValue(E->getLHS());
527  assert(!LHSLV.isKVCRef() &&
528         "setter/getter access of complex using property syntax NYI");
529  // We know the LHS is a complex lvalue.
530  ComplexPairTy LHSComplexPair;
531  if (LHSLV.isPropertyRef())
532    LHSComplexPair =
533      CGF.EmitObjCPropertyGet(LHSLV.getPropertyRefExpr()).getComplexVal();
534  else
535    LHSComplexPair = EmitLoadOfComplex(LHSLV.getAddress(),
536                                       LHSLV.isVolatileQualified());
537
538  OpInfo.LHS=EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
539
540  // Expand the binary operator.
541  ComplexPairTy Result = (this->*Func)(OpInfo);
542
543  // Truncate the result back to the LHS type.
544  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
545
546  // Store the result value into the LHS lvalue.
547  if (LHSLV.isPropertyRef())
548    CGF.EmitObjCPropertySet(LHSLV.getPropertyRefExpr(),
549                            RValue::getComplex(Result));
550  else
551    EmitStoreOfComplex(Result, LHSLV.getAddress(), LHSLV.isVolatileQualified());
552  // And now return the LHS
553  IgnoreReal = ignreal;
554  IgnoreImag = ignimag;
555  IgnoreRealAssign = ignreal;
556  IgnoreImagAssign = ignimag;
557  if (LHSLV.isPropertyRef())
558    return CGF.EmitObjCPropertyGet(LHSLV.getPropertyRefExpr()).getComplexVal();
559  return EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
560}
561
562ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
563  TestAndClearIgnoreReal();
564  TestAndClearIgnoreImag();
565  bool ignreal = TestAndClearIgnoreRealAssign();
566  bool ignimag = TestAndClearIgnoreImagAssign();
567  assert(CGF.getContext().getCanonicalType(E->getLHS()->getType()) ==
568         CGF.getContext().getCanonicalType(E->getRHS()->getType()) &&
569         "Invalid assignment");
570  // Emit the RHS.
571  ComplexPairTy Val = Visit(E->getRHS());
572
573  // Compute the address to store into.
574  LValue LHS = CGF.EmitLValue(E->getLHS());
575
576  // Store into it, if simple.
577  if (LHS.isSimple()) {
578    EmitStoreOfComplex(Val, LHS.getAddress(), LHS.isVolatileQualified());
579
580    // And now return the LHS
581    IgnoreReal = ignreal;
582    IgnoreImag = ignimag;
583    IgnoreRealAssign = ignreal;
584    IgnoreImagAssign = ignimag;
585    return EmitLoadOfComplex(LHS.getAddress(), LHS.isVolatileQualified());
586  }
587
588  // Otherwise we must have a property setter (no complex vector/bitfields).
589  if (LHS.isPropertyRef())
590    CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), RValue::getComplex(Val));
591  else
592    CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Val));
593
594  // There is no reload after a store through a method, but we need to restore
595  // the Ignore* flags.
596  IgnoreReal = ignreal;
597  IgnoreImag = ignimag;
598  IgnoreRealAssign = ignreal;
599  IgnoreImagAssign = ignimag;
600  return Val;
601}
602
603ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
604  CGF.EmitStmt(E->getLHS());
605  CGF.EnsureInsertPoint();
606  return Visit(E->getRHS());
607}
608
609ComplexPairTy ComplexExprEmitter::
610VisitConditionalOperator(const ConditionalOperator *E) {
611  if (!E->getLHS()) {
612    CGF.ErrorUnsupported(E, "conditional operator with missing LHS");
613    const llvm::Type *EltTy =
614      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
615    llvm::Value *U = llvm::UndefValue::get(EltTy);
616    return ComplexPairTy(U, U);
617  }
618
619  TestAndClearIgnoreReal();
620  TestAndClearIgnoreImag();
621  TestAndClearIgnoreRealAssign();
622  TestAndClearIgnoreImagAssign();
623  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
624  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
625  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
626
627  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
628
629  CGF.EmitBlock(LHSBlock);
630
631  // Handle the GNU extension for missing LHS.
632  assert(E->getLHS() && "Must have LHS for complex value");
633
634  ComplexPairTy LHS = Visit(E->getLHS());
635  LHSBlock = Builder.GetInsertBlock();
636  CGF.EmitBranch(ContBlock);
637
638  CGF.EmitBlock(RHSBlock);
639
640  ComplexPairTy RHS = Visit(E->getRHS());
641  RHSBlock = Builder.GetInsertBlock();
642  CGF.EmitBranch(ContBlock);
643
644  CGF.EmitBlock(ContBlock);
645
646  // Create a PHI node for the real part.
647  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
648  RealPN->reserveOperandSpace(2);
649  RealPN->addIncoming(LHS.first, LHSBlock);
650  RealPN->addIncoming(RHS.first, RHSBlock);
651
652  // Create a PHI node for the imaginary part.
653  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
654  ImagPN->reserveOperandSpace(2);
655  ImagPN->addIncoming(LHS.second, LHSBlock);
656  ImagPN->addIncoming(RHS.second, RHSBlock);
657
658  return ComplexPairTy(RealPN, ImagPN);
659}
660
661ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
662  return Visit(E->getChosenSubExpr(CGF.getContext()));
663}
664
665ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
666    bool Ignore = TestAndClearIgnoreReal();
667    (void)Ignore;
668    assert (Ignore == false && "init list ignored");
669    Ignore = TestAndClearIgnoreImag();
670    (void)Ignore;
671    assert (Ignore == false && "init list ignored");
672  if (E->getNumInits())
673    return Visit(E->getInit(0));
674
675  // Empty init list intializes to null
676  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
677  const llvm::Type* LTy = CGF.ConvertType(Ty);
678  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
679  return ComplexPairTy(zeroConstant, zeroConstant);
680}
681
682ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
683  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
684  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
685
686  if (!ArgPtr) {
687    CGF.ErrorUnsupported(E, "complex va_arg expression");
688    const llvm::Type *EltTy =
689      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
690    llvm::Value *U = llvm::UndefValue::get(EltTy);
691    return ComplexPairTy(U, U);
692  }
693
694  // FIXME Volatility.
695  return EmitLoadOfComplex(ArgPtr, false);
696}
697
698//===----------------------------------------------------------------------===//
699//                         Entry Point into this File
700//===----------------------------------------------------------------------===//
701
702/// EmitComplexExpr - Emit the computation of the specified expression of
703/// complex type, ignoring the result.
704ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
705                                               bool IgnoreImag, bool IgnoreRealAssign, bool IgnoreImagAssign) {
706  assert(E && E->getType()->isAnyComplexType() &&
707         "Invalid complex expression to emit");
708
709  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag, IgnoreRealAssign,
710                            IgnoreImagAssign)
711    .Visit(const_cast<Expr*>(E));
712}
713
714/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
715/// of complex type, storing into the specified Value*.
716void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
717                                              llvm::Value *DestAddr,
718                                              bool DestIsVolatile) {
719  assert(E && E->getType()->isAnyComplexType() &&
720         "Invalid complex expression to emit");
721  ComplexExprEmitter Emitter(*this);
722  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
723  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
724}
725
726/// StoreComplexToAddr - Store a complex number into the specified address.
727void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
728                                         llvm::Value *DestAddr,
729                                         bool DestIsVolatile) {
730  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
731}
732
733/// LoadComplexFromAddr - Load a complex number from the specified address.
734ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
735                                                   bool SrcIsVolatile) {
736  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
737}
738