CGExprComplex.cpp revision b3589f44c5d295cd41de2c83f3475116835eeebd 
1//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes with complex types as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
15#include "CodeGenModule.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/StmtVisitor.h"
18#include "llvm/Constants.h"
19#include "llvm/Function.h"
20#include "llvm/ADT/SmallString.h"
21#include "llvm/Support/Compiler.h"
22using namespace clang;
23using namespace CodeGen;
24
25//===----------------------------------------------------------------------===//
26//                        Complex Expression Emitter
27//===----------------------------------------------------------------------===//
28
29typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
30
31namespace  {
32class VISIBILITY_HIDDEN ComplexExprEmitter
33  : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
34  CodeGenFunction &CGF;
35  CGBuilderTy &Builder;
36  // True is we should ignore the value of a
37  bool IgnoreReal;
38  bool IgnoreImag;
39  // True if we should ignore the value of a=b
40  bool IgnoreRealAssign;
41  bool IgnoreImagAssign;
42public:
43  ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false,
44                     bool irn=false, bool iin=false)
45    : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii),
46    IgnoreRealAssign(irn), IgnoreImagAssign(iin) {
47  }
48
49
50  //===--------------------------------------------------------------------===//
51  //                               Utilities
52  //===--------------------------------------------------------------------===//
53
54  bool TestAndClearIgnoreReal() {
55    bool I = IgnoreReal;
56    IgnoreReal = false;
57    return I;
58  }
59  bool TestAndClearIgnoreImag() {
60    bool I = IgnoreImag;
61    IgnoreImag = false;
62    return I;
63  }
64  bool TestAndClearIgnoreRealAssign() {
65    bool I = IgnoreRealAssign;
66    IgnoreRealAssign = false;
67    return I;
68  }
69  bool TestAndClearIgnoreImagAssign() {
70    bool I = IgnoreImagAssign;
71    IgnoreImagAssign = false;
72    return I;
73  }
74
75  /// EmitLoadOfLValue - Given an expression with complex type that represents a
76  /// value l-value, this method emits the address of the l-value, then loads
77  /// and returns the result.
78  ComplexPairTy EmitLoadOfLValue(const Expr *E) {
79    LValue LV = CGF.EmitLValue(E);
80    if (LV.isSimple())
81      return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
82
83    if (LV.isPropertyRef())
84      return CGF.EmitObjCPropertyGet(LV.getPropertyRefExpr()).getComplexVal();
85
86    assert(LV.isKVCRef() && "Unknown LValue type!");
87    return CGF.EmitObjCPropertyGet(LV.getKVCRefExpr()).getComplexVal();
88  }
89
90  /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
91  /// the real and imaginary pieces.
92  ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
93
94  /// EmitStoreOfComplex - Store the specified real/imag parts into the
95  /// specified value pointer.
96  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
97
98  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
99  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
100                                         QualType DestType);
101
102  //===--------------------------------------------------------------------===//
103  //                            Visitor Methods
104  //===--------------------------------------------------------------------===//
105
106  ComplexPairTy VisitStmt(Stmt *S) {
107    S->dump(CGF.getContext().getSourceManager());
108    assert(0 && "Stmt can't have complex result type!");
109    return ComplexPairTy();
110  }
111  ComplexPairTy VisitExpr(Expr *S);
112  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
113  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
114
115  // l-values.
116  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
117  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
118    return EmitLoadOfLValue(E);
119  }
120  ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
121    return EmitLoadOfLValue(E);
122  }
123  ComplexPairTy VisitObjCKVCRefExpr(ObjCKVCRefExpr *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  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
150    return VisitPrePostIncDec(E, false, false);
151  }
152  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
153    return VisitPrePostIncDec(E, true, false);
154  }
155  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
156    return VisitPrePostIncDec(E, false, true);
157  }
158  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
159    return VisitPrePostIncDec(E, true, true);
160  }
161  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
162  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
163    TestAndClearIgnoreReal();
164    TestAndClearIgnoreImag();
165    TestAndClearIgnoreRealAssign();
166    TestAndClearIgnoreImagAssign();
167    return Visit(E->getSubExpr());
168  }
169  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
170  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
171  // LNot,Real,Imag never return complex.
172  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
173    return Visit(E->getSubExpr());
174  }
175  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
176    return Visit(DAE->getExpr());
177  }
178  ComplexPairTy VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
179    return CGF.EmitCXXExprWithTemporaries(E).getComplexVal();
180  }
181  ComplexPairTy VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
182    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
183    QualType Elem = E->getType()->getAsComplexType()->getElementType();
184    llvm::Constant *Null =
185                       CGF.getLLVMContext().getNullValue(CGF.ConvertType(Elem));
186    return ComplexPairTy(Null, Null);
187  }
188  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
189    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
190    QualType Elem = E->getType()->getAsComplexType()->getElementType();
191    llvm::Constant *Null =
192                       CGF.getLLVMContext().getNullValue(CGF.ConvertType(Elem));
193    return ComplexPairTy(Null, Null);
194  }
195
196  struct BinOpInfo {
197    ComplexPairTy LHS;
198    ComplexPairTy RHS;
199    QualType Ty;  // Computation Type.
200  };
201
202  BinOpInfo EmitBinOps(const BinaryOperator *E);
203  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
204                                   ComplexPairTy (ComplexExprEmitter::*Func)
205                                   (const BinOpInfo &));
206
207  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
208  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
209  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
210  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
211
212  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
213    return EmitBinMul(EmitBinOps(E));
214  }
215  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
216    return EmitBinAdd(EmitBinOps(E));
217  }
218  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
219    return EmitBinSub(EmitBinOps(E));
220  }
221  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
222    return EmitBinDiv(EmitBinOps(E));
223  }
224
225  // Compound assignments.
226  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
227    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
228  }
229  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
230    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
231  }
232  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
233    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
234  }
235  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
236    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
237  }
238
239  // GCC rejects rem/and/or/xor for integer complex.
240  // Logical and/or always return int, never complex.
241
242  // No comparisons produce a complex result.
243  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
244  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
245
246
247  ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
248  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
249
250  ComplexPairTy VisitInitListExpr(InitListExpr *E);
251
252  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
253};
254}  // end anonymous namespace.
255
256//===----------------------------------------------------------------------===//
257//                                Utilities
258//===----------------------------------------------------------------------===//
259
260/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
261/// load the real and imaginary pieces, returning them as Real/Imag.
262ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
263                                                    bool isVolatile) {
264  llvm::SmallString<64> Name(SrcPtr->getName().begin(),
265                             SrcPtr->getName().end());
266
267  llvm::Value *Real=0, *Imag=0;
268
269  if (!IgnoreReal) {
270    Name += ".realp";
271    llvm::Value *RealPtr = Builder.CreateStructGEP(SrcPtr, 0, Name.c_str());
272
273    Name.pop_back();  // .realp -> .real
274    Real = Builder.CreateLoad(RealPtr, isVolatile, Name.c_str());
275    Name.resize(Name.size()-4); // .real -> .imagp
276  }
277
278  if (!IgnoreImag) {
279    Name += "imagp";
280
281    llvm::Value *ImagPtr = Builder.CreateStructGEP(SrcPtr, 1, Name.c_str());
282
283    Name.pop_back();  // .imagp -> .imag
284    Imag = Builder.CreateLoad(ImagPtr, isVolatile, Name.c_str());
285  }
286  return ComplexPairTy(Real, Imag);
287}
288
289/// EmitStoreOfComplex - Store the specified real/imag parts into the
290/// specified value pointer.
291void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
292                                            bool isVolatile) {
293  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
294  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
295
296  Builder.CreateStore(Val.first, RealPtr, isVolatile);
297  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
298}
299
300
301
302//===----------------------------------------------------------------------===//
303//                            Visitor Methods
304//===----------------------------------------------------------------------===//
305
306ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
307  CGF.ErrorUnsupported(E, "complex expression");
308  const llvm::Type *EltTy =
309    CGF.ConvertType(E->getType()->getAsComplexType()->getElementType());
310  llvm::Value *U = llvm::UndefValue::get(EltTy);
311  return ComplexPairTy(U, U);
312}
313
314ComplexPairTy ComplexExprEmitter::
315VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
316  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
317  return
318        ComplexPairTy(CGF.getLLVMContext().getNullValue(Imag->getType()), Imag);
319}
320
321
322ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
323  if (E->getCallReturnType()->isReferenceType())
324    return EmitLoadOfLValue(E);
325
326  return CGF.EmitCallExpr(E).getComplexVal();
327}
328
329ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
330  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
331}
332
333/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
334ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
335                                                           QualType SrcType,
336                                                           QualType DestType) {
337  // Get the src/dest element type.
338  SrcType = SrcType->getAsComplexType()->getElementType();
339  DestType = DestType->getAsComplexType()->getElementType();
340
341  // C99 6.3.1.6: When a value of complex type is converted to another
342  // complex type, both the real and imaginary parts follow the conversion
343  // rules for the corresponding real types.
344  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
345  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
346  return Val;
347}
348
349ComplexPairTy ComplexExprEmitter::EmitCast(Expr *Op, QualType DestTy) {
350  // Two cases here: cast from (complex to complex) and (scalar to complex).
351  if (Op->getType()->isAnyComplexType())
352    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
353
354  // C99 6.3.1.7: When a value of real type is converted to a complex type, the
355  // real part of the complex result value is determined by the rules of
356  // conversion to the corresponding real type and the imaginary part of the
357  // complex result value is a positive zero or an unsigned zero.
358  llvm::Value *Elt = CGF.EmitScalarExpr(Op);
359
360  // Convert the input element to the element type of the complex.
361  DestTy = DestTy->getAsComplexType()->getElementType();
362  Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
363
364  // Return (realval, 0).
365  return ComplexPairTy(Elt, CGF.getLLVMContext().getNullValue(Elt->getType()));
366}
367
368ComplexPairTy ComplexExprEmitter::VisitPrePostIncDec(const UnaryOperator *E,
369                                                     bool isInc, bool isPre) {
370  LValue LV = CGF.EmitLValue(E->getSubExpr());
371  ComplexPairTy InVal = EmitLoadOfComplex(LV.getAddress(),
372                                          LV.isVolatileQualified());
373
374  llvm::Value *NextVal;
375  if (isa<llvm::IntegerType>(InVal.first->getType())) {
376    uint64_t AmountVal = isInc ? 1 : -1;
377    NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
378
379    // Add the inc/dec to the real part.
380    NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
381  } else {
382    QualType ElemTy = E->getType()->getAsComplexType()->getElementType();
383    llvm::APFloat FVal(CGF.getContext().getFloatTypeSemantics(ElemTy), 1);
384    if (!isInc)
385      FVal.changeSign();
386    NextVal = llvm::ConstantFP::get(CGF.getLLVMContext(), FVal);
387
388    // Add the inc/dec to the real part.
389    NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
390  }
391
392  ComplexPairTy IncVal(NextVal, InVal.second);
393
394  // Store the updated result through the lvalue.
395  EmitStoreOfComplex(IncVal, LV.getAddress(), LV.isVolatileQualified());
396
397  // If this is a postinc, return the value read from memory, otherwise use the
398  // updated value.
399  return isPre ? IncVal : InVal;
400}
401
402ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
403  TestAndClearIgnoreReal();
404  TestAndClearIgnoreImag();
405  TestAndClearIgnoreRealAssign();
406  TestAndClearIgnoreImagAssign();
407  ComplexPairTy Op = Visit(E->getSubExpr());
408
409  llvm::Value *ResR, *ResI;
410  if (Op.first->getType()->isFloatingPoint()) {
411    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
412    ResI = Builder.CreateFNeg(Op.second, "neg.i");
413  } else {
414    ResR = Builder.CreateNeg(Op.first,  "neg.r");
415    ResI = Builder.CreateNeg(Op.second, "neg.i");
416  }
417  return ComplexPairTy(ResR, ResI);
418}
419
420ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
421  TestAndClearIgnoreReal();
422  TestAndClearIgnoreImag();
423  TestAndClearIgnoreRealAssign();
424  TestAndClearIgnoreImagAssign();
425  // ~(a+ib) = a + i*-b
426  ComplexPairTy Op = Visit(E->getSubExpr());
427  llvm::Value *ResI;
428  if (Op.second->getType()->isFloatingPoint())
429    ResI = Builder.CreateFNeg(Op.second, "conj.i");
430  else
431    ResI = Builder.CreateNeg(Op.second, "conj.i");
432
433  return ComplexPairTy(Op.first, ResI);
434}
435
436ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
437  llvm::Value *ResR, *ResI;
438
439  if (Op.LHS.first->getType()->isFloatingPoint()) {
440    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
441    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
442  } else {
443    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
444    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
445  }
446  return ComplexPairTy(ResR, ResI);
447}
448
449ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
450  llvm::Value *ResR, *ResI;
451  if (Op.LHS.first->getType()->isFloatingPoint()) {
452    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
453    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
454  } else {
455    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
456    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
457  }
458  return ComplexPairTy(ResR, ResI);
459}
460
461
462ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
463  using llvm::Value;
464  Value *ResR, *ResI;
465
466  if (Op.LHS.first->getType()->isFloatingPoint()) {
467    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
468    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
469    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
470
471    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
472    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
473    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
474  } else {
475    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
476    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
477    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
478
479    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
480    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
481    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
482  }
483  return ComplexPairTy(ResR, ResI);
484}
485
486ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
487  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
488  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
489
490
491  llvm::Value *DSTr, *DSTi;
492  if (Op.LHS.first->getType()->isFloatingPoint()) {
493    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
494    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
495    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
496    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
497
498    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
499    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
500    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
501
502    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
503    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
504    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
505
506    DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
507    DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
508  } else {
509    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
510    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
511    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
512    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
513
514    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
515    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
516    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
517
518    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
519    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
520    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
521
522    if (Op.Ty->getAsComplexType()->getElementType()->isUnsignedIntegerType()) {
523      DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
524      DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
525    } else {
526      DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
527      DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
528    }
529  }
530
531  return ComplexPairTy(DSTr, DSTi);
532}
533
534ComplexExprEmitter::BinOpInfo
535ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
536  TestAndClearIgnoreReal();
537  TestAndClearIgnoreImag();
538  TestAndClearIgnoreRealAssign();
539  TestAndClearIgnoreImagAssign();
540  BinOpInfo Ops;
541  Ops.LHS = Visit(E->getLHS());
542  Ops.RHS = Visit(E->getRHS());
543  Ops.Ty = E->getType();
544  return Ops;
545}
546
547
548// Compound assignments.
549ComplexPairTy ComplexExprEmitter::
550EmitCompoundAssign(const CompoundAssignOperator *E,
551                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
552  TestAndClearIgnoreReal();
553  TestAndClearIgnoreImag();
554  bool ignreal = TestAndClearIgnoreRealAssign();
555  bool ignimag = TestAndClearIgnoreImagAssign();
556  QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType();
557
558  BinOpInfo OpInfo;
559
560  // Load the RHS and LHS operands.
561  // __block variables need to have the rhs evaluated first, plus this should
562  // improve codegen a little.  It is possible for the RHS to be complex or
563  // scalar.
564  OpInfo.Ty = E->getComputationResultType();
565  OpInfo.RHS = EmitCast(E->getRHS(), OpInfo.Ty);
566
567  LValue LHSLV = CGF.EmitLValue(E->getLHS());
568
569
570  // We know the LHS is a complex lvalue.
571  OpInfo.LHS=EmitLoadOfComplex(LHSLV.getAddress(),LHSLV.isVolatileQualified());
572  OpInfo.LHS=EmitComplexToComplexCast(OpInfo.LHS, LHSTy, OpInfo.Ty);
573
574  // Expand the binary operator.
575  ComplexPairTy Result = (this->*Func)(OpInfo);
576
577  // Truncate the result back to the LHS type.
578  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
579
580  // Store the result value into the LHS lvalue.
581  EmitStoreOfComplex(Result, LHSLV.getAddress(), LHSLV.isVolatileQualified());
582  // And now return the LHS
583  IgnoreReal = ignreal;
584  IgnoreImag = ignimag;
585  IgnoreRealAssign = ignreal;
586  IgnoreImagAssign = ignimag;
587  return EmitLoadOfComplex(LHSLV.getAddress(), LHSLV.isVolatileQualified());
588}
589
590ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
591  TestAndClearIgnoreReal();
592  TestAndClearIgnoreImag();
593  bool ignreal = TestAndClearIgnoreRealAssign();
594  bool ignimag = TestAndClearIgnoreImagAssign();
595  assert(CGF.getContext().getCanonicalType(E->getLHS()->getType()) ==
596         CGF.getContext().getCanonicalType(E->getRHS()->getType()) &&
597         "Invalid assignment");
598  // Emit the RHS.
599  ComplexPairTy Val = Visit(E->getRHS());
600
601  // Compute the address to store into.
602  LValue LHS = CGF.EmitLValue(E->getLHS());
603
604  // Store into it, if simple.
605  if (LHS.isSimple()) {
606    EmitStoreOfComplex(Val, LHS.getAddress(), LHS.isVolatileQualified());
607
608    // And now return the LHS
609    IgnoreReal = ignreal;
610    IgnoreImag = ignimag;
611    IgnoreRealAssign = ignreal;
612    IgnoreImagAssign = ignimag;
613    return EmitLoadOfComplex(LHS.getAddress(), LHS.isVolatileQualified());
614  }
615
616  // Otherwise we must have a property setter (no complex vector/bitfields).
617  if (LHS.isPropertyRef())
618    CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), RValue::getComplex(Val));
619  else
620    CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), RValue::getComplex(Val));
621
622  // There is no reload after a store through a method, but we need to restore
623  // the Ignore* flags.
624  IgnoreReal = ignreal;
625  IgnoreImag = ignimag;
626  IgnoreRealAssign = ignreal;
627  IgnoreImagAssign = ignimag;
628  return Val;
629}
630
631ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
632  CGF.EmitStmt(E->getLHS());
633  CGF.EnsureInsertPoint();
634  return Visit(E->getRHS());
635}
636
637ComplexPairTy ComplexExprEmitter::
638VisitConditionalOperator(const ConditionalOperator *E) {
639  TestAndClearIgnoreReal();
640  TestAndClearIgnoreImag();
641  TestAndClearIgnoreRealAssign();
642  TestAndClearIgnoreImagAssign();
643  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
644  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
645  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
646
647  llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond());
648  Builder.CreateCondBr(Cond, LHSBlock, RHSBlock);
649
650  CGF.EmitBlock(LHSBlock);
651
652  // Handle the GNU extension for missing LHS.
653  assert(E->getLHS() && "Must have LHS for complex value");
654
655  ComplexPairTy LHS = Visit(E->getLHS());
656  LHSBlock = Builder.GetInsertBlock();
657  CGF.EmitBranch(ContBlock);
658
659  CGF.EmitBlock(RHSBlock);
660
661  ComplexPairTy RHS = Visit(E->getRHS());
662  RHSBlock = Builder.GetInsertBlock();
663  CGF.EmitBranch(ContBlock);
664
665  CGF.EmitBlock(ContBlock);
666
667  // Create a PHI node for the real part.
668  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
669  RealPN->reserveOperandSpace(2);
670  RealPN->addIncoming(LHS.first, LHSBlock);
671  RealPN->addIncoming(RHS.first, RHSBlock);
672
673  // Create a PHI node for the imaginary part.
674  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
675  ImagPN->reserveOperandSpace(2);
676  ImagPN->addIncoming(LHS.second, LHSBlock);
677  ImagPN->addIncoming(RHS.second, RHSBlock);
678
679  return ComplexPairTy(RealPN, ImagPN);
680}
681
682ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
683  return Visit(E->getChosenSubExpr(CGF.getContext()));
684}
685
686ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
687    bool Ignore = TestAndClearIgnoreReal();
688    (void)Ignore;
689    assert (Ignore == false && "init list ignored");
690    Ignore = TestAndClearIgnoreImag();
691    (void)Ignore;
692    assert (Ignore == false && "init list ignored");
693  if (E->getNumInits())
694    return Visit(E->getInit(0));
695
696  // Empty init list intializes to null
697  QualType Ty = E->getType()->getAsComplexType()->getElementType();
698  const llvm::Type* LTy = CGF.ConvertType(Ty);
699  llvm::Value* zeroConstant = CGF.getLLVMContext().getNullValue(LTy);
700  return ComplexPairTy(zeroConstant, zeroConstant);
701}
702
703ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
704  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
705  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
706
707  if (!ArgPtr) {
708    CGF.ErrorUnsupported(E, "complex va_arg expression");
709    const llvm::Type *EltTy =
710      CGF.ConvertType(E->getType()->getAsComplexType()->getElementType());
711    llvm::Value *U = llvm::UndefValue::get(EltTy);
712    return ComplexPairTy(U, U);
713  }
714
715  // FIXME Volatility.
716  return EmitLoadOfComplex(ArgPtr, false);
717}
718
719//===----------------------------------------------------------------------===//
720//                         Entry Point into this File
721//===----------------------------------------------------------------------===//
722
723/// EmitComplexExpr - Emit the computation of the specified expression of
724/// complex type, ignoring the result.
725ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
726                                               bool IgnoreImag, bool IgnoreRealAssign, bool IgnoreImagAssign) {
727  assert(E && E->getType()->isAnyComplexType() &&
728         "Invalid complex expression to emit");
729
730  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag, IgnoreRealAssign,
731                            IgnoreImagAssign)
732    .Visit(const_cast<Expr*>(E));
733}
734
735/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
736/// of complex type, storing into the specified Value*.
737void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
738                                              llvm::Value *DestAddr,
739                                              bool DestIsVolatile) {
740  assert(E && E->getType()->isAnyComplexType() &&
741         "Invalid complex expression to emit");
742  ComplexExprEmitter Emitter(*this);
743  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
744  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
745}
746
747/// StoreComplexToAddr - Store a complex number into the specified address.
748void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
749                                         llvm::Value *DestAddr,
750                                         bool DestIsVolatile) {
751  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
752}
753
754/// LoadComplexFromAddr - Load a complex number from the specified address.
755ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
756                                                   bool SrcIsVolatile) {
757  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
758}
759