CGExprComplex.cpp revision 1a343ebbf413e8eae6b2737b2b2d79cbf5765571 
1//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes with complex types as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
15#include "CodeGenModule.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/StmtVisitor.h"
18#include "llvm/Constants.h"
19#include "llvm/Function.h"
20#include "llvm/ADT/SmallString.h"
21using namespace clang;
22using namespace CodeGen;
23
24//===----------------------------------------------------------------------===//
25//                        Complex Expression Emitter
26//===----------------------------------------------------------------------===//
27
28typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
29
30namespace  {
31class ComplexExprEmitter
32  : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
33  CodeGenFunction &CGF;
34  CGBuilderTy &Builder;
35  // True is we should ignore the value of a
36  bool IgnoreReal;
37  bool IgnoreImag;
38public:
39  ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
40    : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
41  }
42
43
44  //===--------------------------------------------------------------------===//
45  //                               Utilities
46  //===--------------------------------------------------------------------===//
47
48  bool TestAndClearIgnoreReal() {
49    bool I = IgnoreReal;
50    IgnoreReal = false;
51    return I;
52  }
53  bool TestAndClearIgnoreImag() {
54    bool I = IgnoreImag;
55    IgnoreImag = false;
56    return I;
57  }
58
59  /// EmitLoadOfLValue - Given an expression with complex type that represents a
60  /// value l-value, this method emits the address of the l-value, then loads
61  /// and returns the result.
62  ComplexPairTy EmitLoadOfLValue(const Expr *E) {
63    return EmitLoadOfLValue(CGF.EmitLValue(E));
64  }
65
66  ComplexPairTy EmitLoadOfLValue(LValue LV) {
67    assert(LV.isSimple() && "complex l-value must be simple");
68    return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
69  }
70
71  /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
72  /// the real and imaginary pieces.
73  ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
74
75  /// EmitStoreThroughLValue - Given an l-value of complex type, store
76  /// a complex number into it.
77  void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
78    assert(LV.isSimple() && "complex l-value must be simple");
79    return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
80  }
81
82  /// EmitStoreOfComplex - Store the specified real/imag parts into the
83  /// specified value pointer.
84  void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
85
86  /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
87  ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
88                                         QualType DestType);
89
90  //===--------------------------------------------------------------------===//
91  //                            Visitor Methods
92  //===--------------------------------------------------------------------===//
93
94  ComplexPairTy Visit(Expr *E) {
95    return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
96  }
97
98  ComplexPairTy VisitStmt(Stmt *S) {
99    S->dump(CGF.getContext().getSourceManager());
100    llvm_unreachable("Stmt can't have complex result type!");
101  }
102  ComplexPairTy VisitExpr(Expr *S);
103  ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
104  ComplexPairTy VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
105    return Visit(GE->getResultExpr());
106  }
107  ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
108  ComplexPairTy
109  VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) {
110    return Visit(PE->getReplacement());
111  }
112
113  // l-values.
114  ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
115  ComplexPairTy VisitBlockDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
116  ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
117    return EmitLoadOfLValue(E);
118  }
119  ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
120    return CGF.EmitObjCMessageExpr(E).getComplexVal();
121  }
122  ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
123  ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
124  ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
125    if (E->isGLValue())
126      return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
127    return CGF.getOpaqueRValueMapping(E).getComplexVal();
128  }
129
130  ComplexPairTy VisitPseudoObjectExpr(PseudoObjectExpr *E) {
131    return CGF.EmitPseudoObjectRValue(E).getComplexVal();
132  }
133
134  // FIXME: CompoundLiteralExpr
135
136  ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
137  ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
138    // Unlike for scalars, we don't have to worry about function->ptr demotion
139    // here.
140    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
141  }
142  ComplexPairTy VisitCastExpr(CastExpr *E) {
143    return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
144  }
145  ComplexPairTy VisitCallExpr(const CallExpr *E);
146  ComplexPairTy VisitStmtExpr(const StmtExpr *E);
147
148  // Operators.
149  ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
150                                   bool isInc, bool isPre) {
151    LValue LV = CGF.EmitLValue(E->getSubExpr());
152    return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
153  }
154  ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
155    return VisitPrePostIncDec(E, false, false);
156  }
157  ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
158    return VisitPrePostIncDec(E, true, false);
159  }
160  ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
161    return VisitPrePostIncDec(E, false, true);
162  }
163  ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
164    return VisitPrePostIncDec(E, true, true);
165  }
166  ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
167  ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
168    TestAndClearIgnoreReal();
169    TestAndClearIgnoreImag();
170    return Visit(E->getSubExpr());
171  }
172  ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
173  ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
174  // LNot,Real,Imag never return complex.
175  ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
176    return Visit(E->getSubExpr());
177  }
178  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
179    return Visit(DAE->getExpr());
180  }
181  ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
182    CGF.enterFullExpression(E);
183    CodeGenFunction::RunCleanupsScope Scope(CGF);
184    return Visit(E->getSubExpr());
185  }
186  ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
187    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
188    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
189    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
190    return ComplexPairTy(Null, Null);
191  }
192  ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
193    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
194    QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
195    llvm::Constant *Null =
196                       llvm::Constant::getNullValue(CGF.ConvertType(Elem));
197    return ComplexPairTy(Null, Null);
198  }
199
200  struct BinOpInfo {
201    ComplexPairTy LHS;
202    ComplexPairTy RHS;
203    QualType Ty;  // Computation Type.
204  };
205
206  BinOpInfo EmitBinOps(const BinaryOperator *E);
207  LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
208                                  ComplexPairTy (ComplexExprEmitter::*Func)
209                                  (const BinOpInfo &),
210                                  ComplexPairTy &Val);
211  ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
212                                   ComplexPairTy (ComplexExprEmitter::*Func)
213                                   (const BinOpInfo &));
214
215  ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
216  ComplexPairTy EmitBinSub(const BinOpInfo &Op);
217  ComplexPairTy EmitBinMul(const BinOpInfo &Op);
218  ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
219
220  ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
221    return EmitBinAdd(EmitBinOps(E));
222  }
223  ComplexPairTy VisitBinSub(const BinaryOperator *E) {
224    return EmitBinSub(EmitBinOps(E));
225  }
226  ComplexPairTy VisitBinMul(const BinaryOperator *E) {
227    return EmitBinMul(EmitBinOps(E));
228  }
229  ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
230    return EmitBinDiv(EmitBinOps(E));
231  }
232
233  // Compound assignments.
234  ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
235    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
236  }
237  ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
238    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
239  }
240  ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
241    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
242  }
243  ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
244    return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
245  }
246
247  // GCC rejects rem/and/or/xor for integer complex.
248  // Logical and/or always return int, never complex.
249
250  // No comparisons produce a complex result.
251
252  LValue EmitBinAssignLValue(const BinaryOperator *E,
253                             ComplexPairTy &Val);
254  ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
255  ComplexPairTy VisitBinComma      (const BinaryOperator *E);
256
257
258  ComplexPairTy
259  VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
260  ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
261
262  ComplexPairTy VisitInitListExpr(InitListExpr *E);
263
264  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
265
266  ComplexPairTy VisitAtomicExpr(AtomicExpr *E) {
267    return CGF.EmitAtomicExpr(E).getComplexVal();
268  }
269};
270}  // end anonymous namespace.
271
272//===----------------------------------------------------------------------===//
273//                                Utilities
274//===----------------------------------------------------------------------===//
275
276/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
277/// load the real and imaginary pieces, returning them as Real/Imag.
278ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
279                                                    bool isVolatile) {
280  llvm::Value *Real=0, *Imag=0;
281
282  if (!IgnoreReal || isVolatile) {
283    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
284                                                 SrcPtr->getName() + ".realp");
285    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
286  }
287
288  if (!IgnoreImag || isVolatile) {
289    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
290                                                 SrcPtr->getName() + ".imagp");
291    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
292  }
293  return ComplexPairTy(Real, Imag);
294}
295
296/// EmitStoreOfComplex - Store the specified real/imag parts into the
297/// specified value pointer.
298void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
299                                            bool isVolatile) {
300  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
301  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
302
303  Builder.CreateStore(Val.first, RealPtr, isVolatile);
304  Builder.CreateStore(Val.second, ImagPtr, isVolatile);
305}
306
307
308
309//===----------------------------------------------------------------------===//
310//                            Visitor Methods
311//===----------------------------------------------------------------------===//
312
313ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
314  CGF.ErrorUnsupported(E, "complex expression");
315  llvm::Type *EltTy =
316  CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
317  llvm::Value *U = llvm::UndefValue::get(EltTy);
318  return ComplexPairTy(U, U);
319}
320
321ComplexPairTy ComplexExprEmitter::
322VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
323  llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
324  return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
325}
326
327
328ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
329  if (E->getCallReturnType()->isReferenceType())
330    return EmitLoadOfLValue(E);
331
332  return CGF.EmitCallExpr(E).getComplexVal();
333}
334
335ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
336  CodeGenFunction::StmtExprEvaluation eval(CGF);
337  return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
338}
339
340/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
341ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
342                                                           QualType SrcType,
343                                                           QualType DestType) {
344  // Get the src/dest element type.
345  SrcType = SrcType->getAs<ComplexType>()->getElementType();
346  DestType = DestType->getAs<ComplexType>()->getElementType();
347
348  // C99 6.3.1.6: When a value of complex type is converted to another
349  // complex type, both the real and imaginary parts follow the conversion
350  // rules for the corresponding real types.
351  Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
352  Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
353  return Val;
354}
355
356ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
357                                           QualType DestTy) {
358  switch (CK) {
359  case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
360
361  case CK_NoOp:
362  case CK_LValueToRValue:
363  case CK_UserDefinedConversion:
364    return Visit(Op);
365
366  case CK_LValueBitCast: {
367    llvm::Value *V = CGF.EmitLValue(Op).getAddress();
368    V = Builder.CreateBitCast(V,
369                    CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
370    // FIXME: Are the qualifiers correct here?
371    return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
372  }
373
374  case CK_BitCast:
375  case CK_BaseToDerived:
376  case CK_DerivedToBase:
377  case CK_UncheckedDerivedToBase:
378  case CK_Dynamic:
379  case CK_ToUnion:
380  case CK_ArrayToPointerDecay:
381  case CK_FunctionToPointerDecay:
382  case CK_NullToPointer:
383  case CK_NullToMemberPointer:
384  case CK_BaseToDerivedMemberPointer:
385  case CK_DerivedToBaseMemberPointer:
386  case CK_MemberPointerToBoolean:
387  case CK_ConstructorConversion:
388  case CK_IntegralToPointer:
389  case CK_PointerToIntegral:
390  case CK_PointerToBoolean:
391  case CK_ToVoid:
392  case CK_VectorSplat:
393  case CK_IntegralCast:
394  case CK_IntegralToBoolean:
395  case CK_IntegralToFloating:
396  case CK_FloatingToIntegral:
397  case CK_FloatingToBoolean:
398  case CK_FloatingCast:
399  case CK_CPointerToObjCPointerCast:
400  case CK_BlockPointerToObjCPointerCast:
401  case CK_AnyPointerToBlockPointerCast:
402  case CK_ObjCObjectLValueCast:
403  case CK_FloatingComplexToReal:
404  case CK_FloatingComplexToBoolean:
405  case CK_IntegralComplexToReal:
406  case CK_IntegralComplexToBoolean:
407  case CK_ARCProduceObject:
408  case CK_ARCConsumeObject:
409  case CK_ARCReclaimReturnedObject:
410  case CK_ARCExtendBlockObject:
411    llvm_unreachable("invalid cast kind for complex value");
412
413  case CK_FloatingRealToComplex:
414  case CK_IntegralRealToComplex: {
415    llvm::Value *Elt = CGF.EmitScalarExpr(Op);
416
417    // Convert the input element to the element type of the complex.
418    DestTy = DestTy->getAs<ComplexType>()->getElementType();
419    Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
420
421    // Return (realval, 0).
422    return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
423  }
424
425  case CK_FloatingComplexCast:
426  case CK_FloatingComplexToIntegralComplex:
427  case CK_IntegralComplexCast:
428  case CK_IntegralComplexToFloatingComplex:
429    return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
430  }
431
432  llvm_unreachable("unknown cast resulting in complex value");
433}
434
435ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
436  TestAndClearIgnoreReal();
437  TestAndClearIgnoreImag();
438  ComplexPairTy Op = Visit(E->getSubExpr());
439
440  llvm::Value *ResR, *ResI;
441  if (Op.first->getType()->isFloatingPointTy()) {
442    ResR = Builder.CreateFNeg(Op.first,  "neg.r");
443    ResI = Builder.CreateFNeg(Op.second, "neg.i");
444  } else {
445    ResR = Builder.CreateNeg(Op.first,  "neg.r");
446    ResI = Builder.CreateNeg(Op.second, "neg.i");
447  }
448  return ComplexPairTy(ResR, ResI);
449}
450
451ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
452  TestAndClearIgnoreReal();
453  TestAndClearIgnoreImag();
454  // ~(a+ib) = a + i*-b
455  ComplexPairTy Op = Visit(E->getSubExpr());
456  llvm::Value *ResI;
457  if (Op.second->getType()->isFloatingPointTy())
458    ResI = Builder.CreateFNeg(Op.second, "conj.i");
459  else
460    ResI = Builder.CreateNeg(Op.second, "conj.i");
461
462  return ComplexPairTy(Op.first, ResI);
463}
464
465ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
466  llvm::Value *ResR, *ResI;
467
468  if (Op.LHS.first->getType()->isFloatingPointTy()) {
469    ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
470    ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
471  } else {
472    ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
473    ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
474  }
475  return ComplexPairTy(ResR, ResI);
476}
477
478ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
479  llvm::Value *ResR, *ResI;
480  if (Op.LHS.first->getType()->isFloatingPointTy()) {
481    ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
482    ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
483  } else {
484    ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
485    ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
486  }
487  return ComplexPairTy(ResR, ResI);
488}
489
490
491ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
492  using llvm::Value;
493  Value *ResR, *ResI;
494
495  if (Op.LHS.first->getType()->isFloatingPointTy()) {
496    Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
497    Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
498    ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
499
500    Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
501    Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
502    ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
503  } else {
504    Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
505    Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
506    ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
507
508    Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
509    Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
510    ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
511  }
512  return ComplexPairTy(ResR, ResI);
513}
514
515ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
516  llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
517  llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
518
519
520  llvm::Value *DSTr, *DSTi;
521  if (Op.LHS.first->getType()->isFloatingPointTy()) {
522    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
523    llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr); // a*c
524    llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi); // b*d
525    llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2); // ac+bd
526
527    llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr); // c*c
528    llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi); // d*d
529    llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5); // cc+dd
530
531    llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr); // b*c
532    llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi); // a*d
533    llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8); // bc-ad
534
535    DSTr = Builder.CreateFDiv(Tmp3, Tmp6);
536    DSTi = Builder.CreateFDiv(Tmp9, Tmp6);
537  } else {
538    // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
539    llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
540    llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
541    llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
542
543    llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
544    llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
545    llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
546
547    llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
548    llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
549    llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
550
551    if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
552      DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
553      DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
554    } else {
555      DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
556      DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
557    }
558  }
559
560  return ComplexPairTy(DSTr, DSTi);
561}
562
563ComplexExprEmitter::BinOpInfo
564ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
565  TestAndClearIgnoreReal();
566  TestAndClearIgnoreImag();
567  BinOpInfo Ops;
568  Ops.LHS = Visit(E->getLHS());
569  Ops.RHS = Visit(E->getRHS());
570  Ops.Ty = E->getType();
571  return Ops;
572}
573
574
575LValue ComplexExprEmitter::
576EmitCompoundAssignLValue(const CompoundAssignOperator *E,
577          ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
578                         ComplexPairTy &Val) {
579  TestAndClearIgnoreReal();
580  TestAndClearIgnoreImag();
581  QualType LHSTy = E->getLHS()->getType();
582
583  BinOpInfo OpInfo;
584
585  // Load the RHS and LHS operands.
586  // __block variables need to have the rhs evaluated first, plus this should
587  // improve codegen a little.
588  OpInfo.Ty = E->getComputationResultType();
589
590  // The RHS should have been converted to the computation type.
591  assert(OpInfo.Ty->isAnyComplexType());
592  assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
593                                                 E->getRHS()->getType()));
594  OpInfo.RHS = Visit(E->getRHS());
595
596  LValue LHS = CGF.EmitLValue(E->getLHS());
597
598  // Load from the l-value.
599  ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
600
601  OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
602
603  // Expand the binary operator.
604  ComplexPairTy Result = (this->*Func)(OpInfo);
605
606  // Truncate the result back to the LHS type.
607  Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
608  Val = Result;
609
610  // Store the result value into the LHS lvalue.
611  EmitStoreThroughLValue(Result, LHS);
612
613  return LHS;
614}
615
616// Compound assignments.
617ComplexPairTy ComplexExprEmitter::
618EmitCompoundAssign(const CompoundAssignOperator *E,
619                   ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
620  ComplexPairTy Val;
621  LValue LV = EmitCompoundAssignLValue(E, Func, Val);
622
623  // The result of an assignment in C is the assigned r-value.
624  if (!CGF.getContext().getLangOptions().CPlusPlus)
625    return Val;
626
627  // If the lvalue is non-volatile, return the computed value of the assignment.
628  if (!LV.isVolatileQualified())
629    return Val;
630
631  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
632}
633
634LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
635                                               ComplexPairTy &Val) {
636  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
637                                                 E->getRHS()->getType()) &&
638         "Invalid assignment");
639  TestAndClearIgnoreReal();
640  TestAndClearIgnoreImag();
641
642  // Emit the RHS.  __block variables need the RHS evaluated first.
643  Val = Visit(E->getRHS());
644
645  // Compute the address to store into.
646  LValue LHS = CGF.EmitLValue(E->getLHS());
647
648  // Store the result value into the LHS lvalue.
649  EmitStoreThroughLValue(Val, LHS);
650
651  return LHS;
652}
653
654ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
655  ComplexPairTy Val;
656  LValue LV = EmitBinAssignLValue(E, Val);
657
658  // The result of an assignment in C is the assigned r-value.
659  if (!CGF.getContext().getLangOptions().CPlusPlus)
660    return Val;
661
662  // If the lvalue is non-volatile, return the computed value of the assignment.
663  if (!LV.isVolatileQualified())
664    return Val;
665
666  return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
667}
668
669ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
670  CGF.EmitIgnoredExpr(E->getLHS());
671  return Visit(E->getRHS());
672}
673
674ComplexPairTy ComplexExprEmitter::
675VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
676  TestAndClearIgnoreReal();
677  TestAndClearIgnoreImag();
678  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
679  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
680  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
681
682  // Bind the common expression if necessary.
683  CodeGenFunction::OpaqueValueMapping binding(CGF, E);
684
685  CodeGenFunction::ConditionalEvaluation eval(CGF);
686  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
687
688  eval.begin(CGF);
689  CGF.EmitBlock(LHSBlock);
690  ComplexPairTy LHS = Visit(E->getTrueExpr());
691  LHSBlock = Builder.GetInsertBlock();
692  CGF.EmitBranch(ContBlock);
693  eval.end(CGF);
694
695  eval.begin(CGF);
696  CGF.EmitBlock(RHSBlock);
697  ComplexPairTy RHS = Visit(E->getFalseExpr());
698  RHSBlock = Builder.GetInsertBlock();
699  CGF.EmitBlock(ContBlock);
700  eval.end(CGF);
701
702  // Create a PHI node for the real part.
703  llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
704  RealPN->addIncoming(LHS.first, LHSBlock);
705  RealPN->addIncoming(RHS.first, RHSBlock);
706
707  // Create a PHI node for the imaginary part.
708  llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
709  ImagPN->addIncoming(LHS.second, LHSBlock);
710  ImagPN->addIncoming(RHS.second, RHSBlock);
711
712  return ComplexPairTy(RealPN, ImagPN);
713}
714
715ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
716  return Visit(E->getChosenSubExpr(CGF.getContext()));
717}
718
719ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
720    bool Ignore = TestAndClearIgnoreReal();
721    (void)Ignore;
722    assert (Ignore == false && "init list ignored");
723    Ignore = TestAndClearIgnoreImag();
724    (void)Ignore;
725    assert (Ignore == false && "init list ignored");
726
727  if (E->getNumInits() == 2) {
728    llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
729    llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
730    return ComplexPairTy(Real, Imag);
731  } else if (E->getNumInits() == 1) {
732    return Visit(E->getInit(0));
733  }
734
735  // Empty init list intializes to null
736  assert(E->getNumInits() == 0 && "Unexpected number of inits");
737  QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
738  llvm::Type* LTy = CGF.ConvertType(Ty);
739  llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
740  return ComplexPairTy(zeroConstant, zeroConstant);
741}
742
743ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
744  llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
745  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
746
747  if (!ArgPtr) {
748    CGF.ErrorUnsupported(E, "complex va_arg expression");
749    llvm::Type *EltTy =
750      CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
751    llvm::Value *U = llvm::UndefValue::get(EltTy);
752    return ComplexPairTy(U, U);
753  }
754
755  // FIXME Volatility.
756  return EmitLoadOfComplex(ArgPtr, false);
757}
758
759//===----------------------------------------------------------------------===//
760//                         Entry Point into this File
761//===----------------------------------------------------------------------===//
762
763/// EmitComplexExpr - Emit the computation of the specified expression of
764/// complex type, ignoring the result.
765ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
766                                               bool IgnoreImag) {
767  assert(E && E->getType()->isAnyComplexType() &&
768         "Invalid complex expression to emit");
769
770  return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
771    .Visit(const_cast<Expr*>(E));
772}
773
774/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
775/// of complex type, storing into the specified Value*.
776void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
777                                              llvm::Value *DestAddr,
778                                              bool DestIsVolatile) {
779  assert(E && E->getType()->isAnyComplexType() &&
780         "Invalid complex expression to emit");
781  ComplexExprEmitter Emitter(*this);
782  ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
783  Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
784}
785
786/// StoreComplexToAddr - Store a complex number into the specified address.
787void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
788                                         llvm::Value *DestAddr,
789                                         bool DestIsVolatile) {
790  ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
791}
792
793/// LoadComplexFromAddr - Load a complex number from the specified address.
794ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
795                                                   bool SrcIsVolatile) {
796  return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
797}
798
799LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
800  assert(E->getOpcode() == BO_Assign);
801  ComplexPairTy Val; // ignored
802  return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
803}
804
805LValue CodeGenFunction::
806EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
807  ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
808  switch (E->getOpcode()) {
809  case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
810  case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
811  case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
812  case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
813
814  default:
815    llvm_unreachable("unexpected complex compound assignment");
816    Op = 0;
817  }
818
819  ComplexPairTy Val; // ignored
820  return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
821}
822