CGExprComplex.cpp revision dec0984fce504a39a7f085774fb67cfd9957be58 
1//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes with complex types as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
15#include "CodeGenModule.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/StmtVisitor.h"
18#include "llvm/Constants.h"
19#include "llvm/Function.h"
20#include "llvm/ADT/SmallString.h"
21using namespace clang;
22using namespace CodeGen;
23
24//===----------------------------------------------------------------------===//
25//                        Complex Expression Emitter
26//===----------------------------------------------------------------------===//
27
28typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
29
30namespace  {
31class ComplexExprEmitter
32  : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
33  CodeGenFunction &CGF;
34  CGBuilderTy &Builder;
35  // True is we should ignore the value of a
36  bool IgnoreReal;
37  bool IgnoreImag;
38public:
39  ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
40    : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
41  }
42
43
44  //===--------------------------------------------------------------------===//
45  //                               Utilities
46  //===--------------------------------------------------------------------===//
47
48  bool TestAndClearIgnoreReal() {
49    bool I = IgnoreReal;
50    IgnoreReal = false;
51    return I;
52  }
53  bool TestAndClearIgnoreImag() {
54    bool I = IgnoreImag;
55    IgnoreImag = false;
56    return I;
57  }
58
59  /// EmitLoadOfLValue - Given an expression with complex type that represents a
60  /// value l-value, this method emits the address of the l-value, then loads
61  /// and returns the result.
62  ComplexPairTy EmitLoadOfLValue(const Expr *E) {
63    return EmitLoadOfLValue(CGF.EmitLValue(E));
64  }
65
66  ComplexPairTy EmitLoadOfLValue(LValue LV) {
67    if (LV.isSimple())
68      return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
69
70    assert(LV.isPropertyRef() && "Unknown LValue type!");
71    return CGF.EmitLoadOfPropertyRefLValue(LV).getComplexVal();
72  }
73
74  /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
75  /// the real and imaginary pieces.
76  ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
77
78  /// EmitStoreThroughLValue - Given an l-value of complex type, store
79  /// a complex number into it.
80  void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
81    if (LV.isSimple())
82      return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
83
84    assert(LV.isPropertyRef() && "Unknown LValue type!");
85    CGF.EmitStoreThroughPropertyRefLValue(RValue::getComplex(Val), LV);
86  }
87
88  /// EmitStoreOfComplex - Store the specified real/imag parts into the
89  /// specified value pointer.
90  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
91
92  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
93  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
94                                         QualType DestType);
95
96  //===--------------------------------------------------------------------===//
97  //                            Visitor Methods
98  //===--------------------------------------------------------------------===//
99
100  ComplexPairTy Visit(Expr *E) {
101    llvm::DenseMap<const Expr *, ComplexPairTy>::iterator I =
102      CGF.ConditionalSaveComplexExprs.find(E);
103    if (I != CGF.ConditionalSaveComplexExprs.end())
104      return I->second;
105
106      return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
107  }
108
109  ComplexPairTy VisitStmt(Stmt *S) {
110    S->dump(CGF.getContext().getSourceManager());
111    assert(0 && "Stmt can't have complex result type!");
112    return ComplexPairTy();
113  }
114  ComplexPairTy VisitExpr(Expr *S);
115  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
116  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
117
118  // l-values.
119  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
120  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
121    return EmitLoadOfLValue(E);
122  }
123  ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
124    assert(E->getObjectKind() == OK_Ordinary);
125    return EmitLoadOfLValue(E);
126  }
127  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
128    return CGF.EmitObjCMessageExpr(E).getComplexVal();
129  }
130  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
131  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
132
133  // FIXME: CompoundLiteralExpr
134
135  ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
136  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
137    // Unlike for scalars, we don't have to worry about function->ptr demotion
138    // here.
139    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
140  }
141  ComplexPairTy VisitCastExpr(CastExpr *E) {
142    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
143  }
144  ComplexPairTy VisitCallExpr(const CallExpr *E);
145  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
146
147  // Operators.
148  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
149                                   bool isInc, bool isPre) {
150    LValue LV = CGF.EmitLValue(E->getSubExpr());
151    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
152  }
153  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
154    return VisitPrePostIncDec(E, false, false);
155  }
156  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
157    return VisitPrePostIncDec(E, true, false);
158  }
159  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
160    return VisitPrePostIncDec(E, false, true);
161  }
162  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
163    return VisitPrePostIncDec(E, true, true);
164  }
165  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
166  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
167    TestAndClearIgnoreReal();
168    TestAndClearIgnoreImag();
169    return Visit(E->getSubExpr());
170  }
171  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
172  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
173  // LNot,Real,Imag never return complex.
174  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
175    return Visit(E->getSubExpr());
176  }
177  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
178    return Visit(DAE->getExpr());
179  }
180  ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
181    return CGF.EmitExprWithCleanups(E).getComplexVal();
182  }
183  ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
184    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
185    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
186    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
187    return ComplexPairTy(Null, Null);
188  }
189  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
190    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
191    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
192    llvm::Constant *Null =
193                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
194    return ComplexPairTy(Null, Null);
195  }
196
197  struct BinOpInfo {
198    ComplexPairTy LHS;
199    ComplexPairTy RHS;
200    QualType Ty;  // Computation Type.
201  };
202
203  BinOpInfo EmitBinOps(const BinaryOperator *E);
204  LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
205                                  ComplexPairTy (ComplexExprEmitter::*Func)
206                                  (const BinOpInfo &),
207                                  ComplexPairTy &Val);
208  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
209                                   ComplexPairTy (ComplexExprEmitter::*Func)
210                                   (const BinOpInfo &));
211
212  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
213  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
214  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
215  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
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 VisitBinMul(const BinaryOperator *E) {
224    return EmitBinMul(EmitBinOps(E));
225  }
226  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
227    return EmitBinDiv(EmitBinOps(E));
228  }
229
230  // Compound assignments.
231  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
232    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
233  }
234  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
235    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
236  }
237  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
238    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
239  }
240  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
241    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
242  }
243
244  // GCC rejects rem/and/or/xor for integer complex.
245  // Logical and/or always return int, never complex.
246
247  // No comparisons produce a complex result.
248
249  LValue EmitBinAssignLValue(const BinaryOperator *E,
250                             ComplexPairTy &Val);
251  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
252  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
253
254
255  ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
256  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
257
258  ComplexPairTy VisitInitListExpr(InitListExpr *E);
259
260  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
261};
262}  // end anonymous namespace.
263
264//===----------------------------------------------------------------------===//
265//                                Utilities
266//===----------------------------------------------------------------------===//
267
268/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
269/// load the real and imaginary pieces, returning them as Real/Imag.
270ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
271                                                    bool isVolatile) {
272  llvm::Value *Real=0, *Imag=0;
273
274  if (!IgnoreReal || isVolatile) {
275    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
276                                                 SrcPtr->getName() + ".realp");
277    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
278  }
279
280  if (!IgnoreImag || isVolatile) {
281    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
282                                                 SrcPtr->getName() + ".imagp");
283    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
284  }
285  return ComplexPairTy(Real, Imag);
286}
287
288/// EmitStoreOfComplex - Store the specified real/imag parts into the
289/// specified value pointer.
290void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
291                                            bool isVolatile) {
292  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
293  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
294
295  Builder.CreateStore(Val.first, RealPtr, isVolatile);
296  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
297}
298
299
300
301//===----------------------------------------------------------------------===//
302//                            Visitor Methods
303//===----------------------------------------------------------------------===//
304
305ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
306  CGF.ErrorUnsupported(E, "complex expression");
307  const llvm::Type *EltTy =
308    CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
309  llvm::Value *U = llvm::UndefValue::get(EltTy);
310  return ComplexPairTy(U, U);
311}
312
313ComplexPairTy ComplexExprEmitter::
314VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
315  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
316  return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
317}
318
319
320ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
321  if (E->getCallReturnType()->isReferenceType())
322    return EmitLoadOfLValue(E);
323
324  return CGF.EmitCallExpr(E).getComplexVal();
325}
326
327ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
328  RValue result = CGF.EmitCompoundStmt(*E->getSubStmt(), true);
329  CGF.EnsureInsertPoint();
330  return result.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->getAs<ComplexType>()->getElementType();
339  DestType = DestType->getAs<ComplexType>()->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(CastExpr::CastKind CK, Expr *Op,
350                                           QualType DestTy) {
351  switch (CK) {
352  case CK_GetObjCProperty: {
353    LValue LV = CGF.EmitLValue(Op);
354    assert(LV.isPropertyRef() && "Unknown LValue type!");
355    return CGF.EmitLoadOfPropertyRefLValue(LV).getComplexVal();
356  }
357
358  case CK_NoOp:
359  case CK_LValueToRValue:
360    return Visit(Op);
361
362  // TODO: do all of these
363  default:
364    break;
365  }
366
367  // Two cases here: cast from (complex to complex) and (scalar to complex).
368  if (Op->getType()->isAnyComplexType())
369    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
370
371  // FIXME: We should be looking at all of the cast kinds here, not
372  // cherry-picking the ones we have test cases for.
373  if (CK == CK_LValueBitCast) {
374    llvm::Value *V = CGF.EmitLValue(Op).getAddress();
375    V = Builder.CreateBitCast(V,
376                      CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
377    // FIXME: Are the qualifiers correct here?
378    return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
379  }
380
381  // C99 6.3.1.7: When a value of real type is converted to a complex type, the
382  // real part of the complex result value is determined by the rules of
383  // conversion to the corresponding real type and the imaginary part of the
384  // complex result value is a positive zero or an unsigned zero.
385  llvm::Value *Elt = CGF.EmitScalarExpr(Op);
386
387  // Convert the input element to the element type of the complex.
388  DestTy = DestTy->getAs<ComplexType>()->getElementType();
389  Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
390
391  // Return (realval, 0).
392  return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
393}
394
395ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
396  TestAndClearIgnoreReal();
397  TestAndClearIgnoreImag();
398  ComplexPairTy Op = Visit(E->getSubExpr());
399
400  llvm::Value *ResR, *ResI;
401  if (Op.first->getType()->isFloatingPointTy()) {
402    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
403    ResI = Builder.CreateFNeg(Op.second, "neg.i");
404  } else {
405    ResR = Builder.CreateNeg(Op.first,  "neg.r");
406    ResI = Builder.CreateNeg(Op.second, "neg.i");
407  }
408  return ComplexPairTy(ResR, ResI);
409}
410
411ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
412  TestAndClearIgnoreReal();
413  TestAndClearIgnoreImag();
414  // ~(a+ib) = a + i*-b
415  ComplexPairTy Op = Visit(E->getSubExpr());
416  llvm::Value *ResI;
417  if (Op.second->getType()->isFloatingPointTy())
418    ResI = Builder.CreateFNeg(Op.second, "conj.i");
419  else
420    ResI = Builder.CreateNeg(Op.second, "conj.i");
421
422  return ComplexPairTy(Op.first, ResI);
423}
424
425ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
426  llvm::Value *ResR, *ResI;
427
428  if (Op.LHS.first->getType()->isFloatingPointTy()) {
429    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
430    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
431  } else {
432    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
433    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
434  }
435  return ComplexPairTy(ResR, ResI);
436}
437
438ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
439  llvm::Value *ResR, *ResI;
440  if (Op.LHS.first->getType()->isFloatingPointTy()) {
441    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
442    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
443  } else {
444    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
445    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
446  }
447  return ComplexPairTy(ResR, ResI);
448}
449
450
451ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
452  using llvm::Value;
453  Value *ResR, *ResI;
454
455  if (Op.LHS.first->getType()->isFloatingPointTy()) {
456    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
457    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
458    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
459
460    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
461    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
462    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
463  } else {
464    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
465    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
466    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
467
468    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
469    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
470    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
471  }
472  return ComplexPairTy(ResR, ResI);
473}
474
475ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
476  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
477  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
478
479
480  llvm::Value *DSTr, *DSTi;
481  if (Op.LHS.first->getType()->isFloatingPointTy()) {
482    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
483    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
484    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
485    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
486
487    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
488    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
489    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
490
491    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
492    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
493    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
494
495    DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
496    DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
497  } else {
498    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
499    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
500    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
501    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
502
503    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
504    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
505    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
506
507    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
508    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
509    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
510
511    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
512      DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
513      DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
514    } else {
515      DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
516      DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
517    }
518  }
519
520  return ComplexPairTy(DSTr, DSTi);
521}
522
523ComplexExprEmitter::BinOpInfo
524ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
525  TestAndClearIgnoreReal();
526  TestAndClearIgnoreImag();
527  BinOpInfo Ops;
528  Ops.LHS = Visit(E->getLHS());
529  Ops.RHS = Visit(E->getRHS());
530  Ops.Ty = E->getType();
531  return Ops;
532}
533
534
535LValue ComplexExprEmitter::
536EmitCompoundAssignLValue(const CompoundAssignOperator *E,
537          ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
538                         ComplexPairTy &Val) {
539  TestAndClearIgnoreReal();
540  TestAndClearIgnoreImag();
541  QualType LHSTy = E->getLHS()->getType();
542
543  BinOpInfo OpInfo;
544
545  // Load the RHS and LHS operands.
546  // __block variables need to have the rhs evaluated first, plus this should
547  // improve codegen a little.
548  OpInfo.Ty = E->getComputationResultType();
549
550  // The RHS should have been converted to the computation type.
551  assert(OpInfo.Ty->isAnyComplexType());
552  assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
553                                                 E->getRHS()->getType()));
554  OpInfo.RHS = Visit(E->getRHS());
555
556  LValue LHS = CGF.EmitLValue(E->getLHS());
557
558  // Load from the l-value.
559  ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
560
561  OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
562
563  // Expand the binary operator.
564  ComplexPairTy Result = (this->*Func)(OpInfo);
565
566  // Truncate the result back to the LHS type.
567  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
568  Val = Result;
569
570  // Store the result value into the LHS lvalue.
571  EmitStoreThroughLValue(Result, LHS);
572
573  return LHS;
574}
575
576// Compound assignments.
577ComplexPairTy ComplexExprEmitter::
578EmitCompoundAssign(const CompoundAssignOperator *E,
579                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
580  ComplexPairTy Val;
581  LValue LV = EmitCompoundAssignLValue(E, Func, Val);
582
583  // The result of an assignment in C is the assigned r-value.
584  if (!CGF.getContext().getLangOptions().CPlusPlus)
585    return Val;
586
587  // Objective-C property assignment never reloads the value following a store.
588  if (LV.isPropertyRef())
589    return Val;
590
591  // If the lvalue is non-volatile, return the computed value of the assignment.
592  if (!LV.isVolatileQualified())
593    return Val;
594
595  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
596}
597
598LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
599                                               ComplexPairTy &Val) {
600  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
601                                                 E->getRHS()->getType()) &&
602         "Invalid assignment");
603  TestAndClearIgnoreReal();
604  TestAndClearIgnoreImag();
605
606  // Emit the RHS.  __block variables need the RHS evaluated first.
607  Val = Visit(E->getRHS());
608
609  // Compute the address to store into.
610  LValue LHS = CGF.EmitLValue(E->getLHS());
611
612  // Store the result value into the LHS lvalue.
613  EmitStoreThroughLValue(Val, LHS);
614
615  return LHS;
616}
617
618ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
619  ComplexPairTy Val;
620  LValue LV = EmitBinAssignLValue(E, Val);
621
622  // The result of an assignment in C is the assigned r-value.
623  if (!CGF.getContext().getLangOptions().CPlusPlus)
624    return Val;
625
626  // Objective-C property assignment never reloads the value following a store.
627  if (LV.isPropertyRef())
628    return Val;
629
630  // If the lvalue is non-volatile, return the computed value of the assignment.
631  if (!LV.isVolatileQualified())
632    return Val;
633
634  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
635}
636
637ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
638  CGF.EmitIgnoredExpr(E->getLHS());
639  return Visit(E->getRHS());
640}
641
642ComplexPairTy ComplexExprEmitter::
643VisitConditionalOperator(const ConditionalOperator *E) {
644  TestAndClearIgnoreReal();
645  TestAndClearIgnoreImag();
646  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
647  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
648  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
649
650  if (E->getLHS())
651    CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
652  else {
653    Expr *save = E->getSAVE();
654    assert(save && "VisitConditionalOperator - save is null");
655    // Intentianlly not doing direct assignment to ConditionalSaveExprs[save] !!
656    ComplexPairTy SaveVal = Visit(save);
657    CGF.ConditionalSaveComplexExprs[save] = SaveVal;
658    CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
659  }
660
661  CGF.EmitBlock(LHSBlock);
662  ComplexPairTy LHS = Visit(E->getTrueExpr());
663  LHSBlock = Builder.GetInsertBlock();
664  CGF.EmitBranch(ContBlock);
665
666  CGF.EmitBlock(RHSBlock);
667
668  ComplexPairTy RHS = Visit(E->getRHS());
669  RHSBlock = Builder.GetInsertBlock();
670  CGF.EmitBranch(ContBlock);
671
672  CGF.EmitBlock(ContBlock);
673
674  // Create a PHI node for the real part.
675  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
676  RealPN->reserveOperandSpace(2);
677  RealPN->addIncoming(LHS.first, LHSBlock);
678  RealPN->addIncoming(RHS.first, RHSBlock);
679
680  // Create a PHI node for the imaginary part.
681  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
682  ImagPN->reserveOperandSpace(2);
683  ImagPN->addIncoming(LHS.second, LHSBlock);
684  ImagPN->addIncoming(RHS.second, RHSBlock);
685
686  return ComplexPairTy(RealPN, ImagPN);
687}
688
689ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
690  return Visit(E->getChosenSubExpr(CGF.getContext()));
691}
692
693ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
694    bool Ignore = TestAndClearIgnoreReal();
695    (void)Ignore;
696    assert (Ignore == false && "init list ignored");
697    Ignore = TestAndClearIgnoreImag();
698    (void)Ignore;
699    assert (Ignore == false && "init list ignored");
700  if (E->getNumInits())
701    return Visit(E->getInit(0));
702
703  // Empty init list intializes to null
704  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
705  const llvm::Type* LTy = CGF.ConvertType(Ty);
706  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
707  return ComplexPairTy(zeroConstant, zeroConstant);
708}
709
710ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
711  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
712  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
713
714  if (!ArgPtr) {
715    CGF.ErrorUnsupported(E, "complex va_arg expression");
716    const llvm::Type *EltTy =
717      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
718    llvm::Value *U = llvm::UndefValue::get(EltTy);
719    return ComplexPairTy(U, U);
720  }
721
722  // FIXME Volatility.
723  return EmitLoadOfComplex(ArgPtr, false);
724}
725
726//===----------------------------------------------------------------------===//
727//                         Entry Point into this File
728//===----------------------------------------------------------------------===//
729
730/// EmitComplexExpr - Emit the computation of the specified expression of
731/// complex type, ignoring the result.
732ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
733                                               bool IgnoreImag) {
734  assert(E && E->getType()->isAnyComplexType() &&
735         "Invalid complex expression to emit");
736
737  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
738    .Visit(const_cast<Expr*>(E));
739}
740
741/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
742/// of complex type, storing into the specified Value*.
743void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
744                                              llvm::Value *DestAddr,
745                                              bool DestIsVolatile) {
746  assert(E && E->getType()->isAnyComplexType() &&
747         "Invalid complex expression to emit");
748  ComplexExprEmitter Emitter(*this);
749  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
750  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
751}
752
753/// StoreComplexToAddr - Store a complex number into the specified address.
754void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
755                                         llvm::Value *DestAddr,
756                                         bool DestIsVolatile) {
757  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
758}
759
760/// LoadComplexFromAddr - Load a complex number from the specified address.
761ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
762                                                   bool SrcIsVolatile) {
763  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
764}
765
766LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
767  assert(E->getOpcode() == BO_Assign);
768  ComplexPairTy Val; // ignored
769  return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
770}
771
772LValue CodeGenFunction::
773EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
774  ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
775  switch (E->getOpcode()) {
776  case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
777  case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
778  case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
779  case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
780
781  default:
782    llvm_unreachable("unexpected complex compound assignment");
783    Op = 0;
784  }
785
786  ComplexPairTy Val; // ignored
787  return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
788}
789