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+//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code to emit Expr nodes with complex types as LLVM code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "clang/AST/AST.h"
+#include "llvm/Constants.h"
+#include "llvm/Function.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/Compiler.h"
+using namespace clang;
+using namespace CodeGen;
+
+//===----------------------------------------------------------------------===//
+// Complex Expression Emitter
+//===----------------------------------------------------------------------===//
+
+typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
+
+namespace {
+class VISIBILITY_HIDDEN ComplexExprEmitter
+ : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
+ CodeGenFunction &CGF;
+ llvm::LLVMFoldingBuilder &Builder;
+public:
+ ComplexExprEmitter(CodeGenFunction &cgf) : CGF(cgf), Builder(CGF.Builder) {
+ }
+
+
+ //===--------------------------------------------------------------------===//
+ // Utilities
+ //===--------------------------------------------------------------------===//
+
+ /// EmitLoadOfLValue - Given an expression with complex type that represents a
+ /// value l-value, this method emits the address of the l-value, then loads
+ /// and returns the result.
+ ComplexPairTy EmitLoadOfLValue(const Expr *E) {
+ LValue LV = CGF.EmitLValue(E);
+ // FIXME: Volatile
+ return EmitLoadOfComplex(LV.getAddress(), false);
+ }
+
+ /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
+ /// the real and imaginary pieces.
+ ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
+
+ /// EmitStoreOfComplex - Store the specified real/imag parts into the
+ /// specified value pointer.
+ void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
+
+ /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
+ ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
+ QualType DestType);
+
+ //===--------------------------------------------------------------------===//
+ // Visitor Methods
+ //===--------------------------------------------------------------------===//
+
+ ComplexPairTy VisitStmt(Stmt *S) {
+ S->dump(CGF.getContext().getSourceManager());
+ assert(0 && "Stmt can't have complex result type!");
+ return ComplexPairTy();
+ }
+ ComplexPairTy VisitExpr(Expr *S);
+ ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
+ ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
+
+ // l-values.
+ ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
+ ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
+ ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
+
+ // FIXME: CompoundLiteralExpr
+
+ ComplexPairTy EmitCast(Expr *Op, QualType DestTy);
+ ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
+ // Unlike for scalars, we don't have to worry about function->ptr demotion
+ // here.
+ return EmitCast(E->getSubExpr(), E->getType());
+ }
+ ComplexPairTy VisitCastExpr(CastExpr *E) {
+ return EmitCast(E->getSubExpr(), E->getType());
+ }
+ ComplexPairTy VisitCallExpr(const CallExpr *E);
+ ComplexPairTy VisitStmtExpr(const StmtExpr *E);
+ ComplexPairTy VisitOverloadExpr(const OverloadExpr *OE);
+
+ // Operators.
+ ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
+ bool isInc, bool isPre);
+ ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
+ return VisitPrePostIncDec(E, false, false);
+ }
+ ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
+ return VisitPrePostIncDec(E, true, false);
+ }
+ ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
+ return VisitPrePostIncDec(E, false, true);
+ }
+ ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
+ return VisitPrePostIncDec(E, true, true);
+ }
+ ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
+ ComplexPairTy VisitUnaryPlus (const UnaryOperator *E) {
+ return Visit(E->getSubExpr());
+ }
+ ComplexPairTy VisitUnaryMinus (const UnaryOperator *E);
+ ComplexPairTy VisitUnaryNot (const UnaryOperator *E);
+ // LNot,SizeOf,AlignOf,Real,Imag never return complex.
+ ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
+ return Visit(E->getSubExpr());
+ }
+
+ struct BinOpInfo {
+ ComplexPairTy LHS;
+ ComplexPairTy RHS;
+ QualType Ty; // Computation Type.
+ };
+
+ BinOpInfo EmitBinOps(const BinaryOperator *E);
+ ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
+ ComplexPairTy (ComplexExprEmitter::*Func)
+ (const BinOpInfo &));
+
+ ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
+ ComplexPairTy EmitBinSub(const BinOpInfo &Op);
+ ComplexPairTy EmitBinMul(const BinOpInfo &Op);
+ ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
+
+ ComplexPairTy VisitBinMul(const BinaryOperator *E) {
+ return EmitBinMul(EmitBinOps(E));
+ }
+ ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
+ return EmitBinAdd(EmitBinOps(E));
+ }
+ ComplexPairTy VisitBinSub(const BinaryOperator *E) {
+ return EmitBinSub(EmitBinOps(E));
+ }
+ ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
+ return EmitBinDiv(EmitBinOps(E));
+ }
+
+ // Compound assignments.
+ ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
+ return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
+ }
+ ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
+ return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
+ }
+ ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
+ return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
+ }
+ ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
+ return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
+ }
+
+ // GCC rejects rem/and/or/xor for integer complex.
+ // Logical and/or always return int, never complex.
+
+ // No comparisons produce a complex result.
+ ComplexPairTy VisitBinAssign (const BinaryOperator *E);
+ ComplexPairTy VisitBinComma (const BinaryOperator *E);
+
+
+ ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
+ ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
+};
+} // end anonymous namespace.
+
+//===----------------------------------------------------------------------===//
+// Utilities
+//===----------------------------------------------------------------------===//
+
+/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
+/// load the real and imaginary pieces, returning them as Real/Imag.
+ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
+ bool isVolatile) {
+ llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
+ llvm::Constant *One = llvm::ConstantInt::get(llvm::Type::Int32Ty, 1);
+
+ llvm::SmallString<64> Name(SrcPtr->getNameStart(),
+ SrcPtr->getNameStart()+SrcPtr->getNameLen());
+
+ Name += ".realp";
+ llvm::Value *Ops[] = {Zero, Zero};
+ llvm::Value *RealPtr = Builder.CreateGEP(SrcPtr, Ops, Ops+2, Name.c_str());
+
+ Name.pop_back(); // .realp -> .real
+ llvm::Value *Real = Builder.CreateLoad(RealPtr, isVolatile, Name.c_str());
+
+ Name.resize(Name.size()-4); // .real -> .imagp
+ Name += "imagp";
+
+ Ops[1] = One; // { Ops = { Zero, One }
+ llvm::Value *ImagPtr = Builder.CreateGEP(SrcPtr, Ops, Ops+2, Name.c_str());
+
+ Name.pop_back(); // .imagp -> .imag
+ llvm::Value *Imag = Builder.CreateLoad(ImagPtr, isVolatile, Name.c_str());
+ return ComplexPairTy(Real, Imag);
+}
+
+/// EmitStoreOfComplex - Store the specified real/imag parts into the
+/// specified value pointer.
+void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
+ bool isVolatile) {
+ llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
+ llvm::Constant *One = llvm::ConstantInt::get(llvm::Type::Int32Ty, 1);
+
+ llvm::Value *Ops[] = {Zero, Zero};
+ llvm::Value *RealPtr = Builder.CreateGEP(Ptr, Ops, Ops+2, "real");
+
+ Ops[1] = One; // { Ops = { Zero, One }
+ llvm::Value *ImagPtr = Builder.CreateGEP(Ptr, Ops, Ops+2, "imag");
+
+ Builder.CreateStore(Val.first, RealPtr, isVolatile);
+ Builder.CreateStore(Val.second, ImagPtr, isVolatile);
+}
+
+
+
+//===----------------------------------------------------------------------===//
+// Visitor Methods
+//===----------------------------------------------------------------------===//
+
+ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
+ CGF.WarnUnsupported(E, "complex expression");
+ const llvm::Type *EltTy =
+ CGF.ConvertType(E->getType()->getAsComplexType()->getElementType());
+ llvm::Value *U = llvm::UndefValue::get(EltTy);
+ return ComplexPairTy(U, U);
+}
+
+ComplexPairTy ComplexExprEmitter::
+VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
+ llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
+ return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
+}
+
+
+ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
+ return CGF.EmitCallExpr(E).getComplexVal();
+}
+
+ComplexPairTy ComplexExprEmitter::VisitOverloadExpr(const OverloadExpr *E) {
+ return CGF.EmitCallExpr(E->getFn(), E->arg_begin(),
+ E->getNumArgs(CGF.getContext())).getComplexVal();
+}
+
+ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
+ return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
+}
+
+/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
+ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
+ QualType SrcType,
+ QualType DestType) {
+ // Get the src/dest element type.
+ SrcType = cast<ComplexType>(SrcType.getCanonicalType())->getElementType();
+ DestType = cast<ComplexType>(DestType.getCanonicalType())->getElementType();
+
+ // C99 6.3.1.6: When a value of complextype is converted to another
+ // complex type, both the real and imaginary parts followthe conversion
+ // rules for the corresponding real types.
+ Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
+ Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
+ return Val;
+}
+
+ComplexPairTy ComplexExprEmitter::EmitCast(Expr *Op, QualType DestTy) {
+ // Two cases here: cast from (complex to complex) and (scalar to complex).
+ if (Op->getType()->isComplexType())
+ return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
+
+ // C99 6.3.1.7: When a value of real type is converted to a complex type, the
+ // real part of the complex result value is determined by the rules of
+ // conversion to the corresponding real type and the imaginary part of the
+ // complex result value is a positive zero or an unsigned zero.
+ llvm::Value *Elt = CGF.EmitScalarExpr(Op);
+
+ // Convert the input element to the element type of the complex.
+ DestTy = cast<ComplexType>(DestTy.getCanonicalType())->getElementType();
+ Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
+
+ // Return (realval, 0).
+ return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
+}
+
+ComplexPairTy ComplexExprEmitter::VisitPrePostIncDec(const UnaryOperator *E,
+ bool isInc, bool isPre) {
+ LValue LV = CGF.EmitLValue(E->getSubExpr());
+ // FIXME: Handle volatile!
+ ComplexPairTy InVal = EmitLoadOfComplex(LV.getAddress(), false);
+
+ uint64_t AmountVal = isInc ? 1 : -1;
+
+ llvm::Value *NextVal;
+ if (isa<llvm::IntegerType>(InVal.first->getType()))
+ NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal);
+ else if (InVal.first->getType() == llvm::Type::FloatTy)
+ // FIXME: Handle long double.
+ NextVal =
+ llvm::ConstantFP::get(InVal.first->getType(),
+ llvm::APFloat(static_cast<float>(AmountVal)));
+ else {
+ // FIXME: Handle long double.
+ assert(InVal.first->getType() == llvm::Type::DoubleTy);
+ NextVal =
+ llvm::ConstantFP::get(InVal.first->getType(),
+ llvm::APFloat(static_cast<double>(AmountVal)));
+ }
+
+ // Add the inc/dec to the real part.
+ NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
+
+ ComplexPairTy IncVal(NextVal, InVal.second);
+
+ // Store the updated result through the lvalue.
+ EmitStoreOfComplex(IncVal, LV.getAddress(), false); /* FIXME: Volatile */
+
+ // If this is a postinc, return the value read from memory, otherwise use the
+ // updated value.
+ return isPre ? IncVal : InVal;
+}
+
+ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
+ ComplexPairTy Op = Visit(E->getSubExpr());
+ llvm::Value *ResR = Builder.CreateNeg(Op.first, "neg.r");
+ llvm::Value *ResI = Builder.CreateNeg(Op.second, "neg.i");
+ return ComplexPairTy(ResR, ResI);
+}
+
+ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
+ // ~(a+ib) = a + i*-b
+ ComplexPairTy Op = Visit(E->getSubExpr());
+ llvm::Value *ResI = Builder.CreateNeg(Op.second, "conj.i");
+ return ComplexPairTy(Op.first, ResI);
+}
+
+ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
+ llvm::Value *ResR = Builder.CreateAdd(Op.LHS.first, Op.RHS.first, "add.r");
+ llvm::Value *ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
+ return ComplexPairTy(ResR, ResI);
+}
+
+ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
+ llvm::Value *ResR = Builder.CreateSub(Op.LHS.first, Op.RHS.first, "sub.r");
+ llvm::Value *ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
+ return ComplexPairTy(ResR, ResI);
+}
+
+
+ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
+ llvm::Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
+ llvm::Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
+ llvm::Value *ResR = Builder.CreateSub(ResRl, ResRr, "mul.r");
+
+ llvm::Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
+ llvm::Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
+ llvm::Value *ResI = Builder.CreateAdd(ResIl, ResIr, "mul.i");
+ return ComplexPairTy(ResR, ResI);
+}
+
+ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
+ llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
+ llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
+
+ // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
+ llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
+ llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
+ llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
+
+ llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
+ llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
+ llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
+
+ llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
+ llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
+ llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
+
+ llvm::Value *DSTr, *DSTi;
+ if (Tmp3->getType()->isFloatingPoint()) {
+ DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
+ DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
+ } else {
+ if (Op.Ty->getAsComplexType()->getElementType()->isUnsignedIntegerType()) {
+ DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
+ DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
+ } else {
+ DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
+ DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
+ }
+ }
+
+ return ComplexPairTy(DSTr, DSTi);
+}
+
+ComplexExprEmitter::BinOpInfo
+ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
+ BinOpInfo Ops;
+ Ops.LHS = Visit(E->getLHS());
+ Ops.RHS = Visit(E->getRHS());
+ Ops.Ty = E->getType();
+ return Ops;
+}
+
+
+// Compound assignments.
+ComplexPairTy ComplexExprEmitter::
+EmitCompoundAssign(const CompoundAssignOperator *E,
+ ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
+ QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType();
+
+ // Load the LHS and RHS operands.
+ LValue LHSLV = CGF.EmitLValue(E->getLHS());
+
+ BinOpInfo OpInfo;
+ OpInfo.Ty = E->getComputationType();
+
+ // We know the LHS is a complex lvalue.
+ OpInfo.LHS = EmitLoadOfComplex(LHSLV.getAddress(), false);// FIXME: Volatile.
+ OpInfo.LHS = EmitComplexToComplexCast(OpInfo.LHS, LHSTy, OpInfo.Ty);
+
+ // It is possible for the RHS to be complex or scalar.
+ OpInfo.RHS = EmitCast(E->getRHS(), OpInfo.Ty);
+
+ // Expand the binary operator.
+ ComplexPairTy Result = (this->*Func)(OpInfo);
+
+ // Truncate the result back to the LHS type.
+ Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
+
+ // Store the result value into the LHS lvalue.
+ EmitStoreOfComplex(Result, LHSLV.getAddress(), false); // FIXME: VOLATILE
+ return Result;
+}
+
+ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
+ assert(E->getLHS()->getType().getCanonicalType() ==
+ E->getRHS()->getType().getCanonicalType() && "Invalid assignment");
+ // Emit the RHS.
+ ComplexPairTy Val = Visit(E->getRHS());
+
+ // Compute the address to store into.
+ LValue LHS = CGF.EmitLValue(E->getLHS());
+
+ // Store into it.
+ // FIXME: Volatility!
+ EmitStoreOfComplex(Val, LHS.getAddress(), false);
+ return Val;
+}
+
+ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
+ CGF.EmitStmt(E->getLHS());
+ return Visit(E->getRHS());
+}
+
+ComplexPairTy ComplexExprEmitter::
+VisitConditionalOperator(const ConditionalOperator *E) {
+ llvm::BasicBlock *LHSBlock = new llvm::BasicBlock("cond.?");
+ llvm::BasicBlock *RHSBlock = new llvm::BasicBlock("cond.:");
+ llvm::BasicBlock *ContBlock = new llvm::BasicBlock("cond.cont");
+
+ llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond());
+ Builder.CreateCondBr(Cond, LHSBlock, RHSBlock);
+
+ CGF.EmitBlock(LHSBlock);
+
+ // Handle the GNU extension for missing LHS.
+ assert(E->getLHS() && "Must have LHS for complex value");
+
+ ComplexPairTy LHS = Visit(E->getLHS());
+ Builder.CreateBr(ContBlock);
+ LHSBlock = Builder.GetInsertBlock();
+
+ CGF.EmitBlock(RHSBlock);
+
+ ComplexPairTy RHS = Visit(E->getRHS());
+ Builder.CreateBr(ContBlock);
+ RHSBlock = Builder.GetInsertBlock();
+
+ CGF.EmitBlock(ContBlock);
+
+ // Create a PHI node for the real part.
+ llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
+ RealPN->reserveOperandSpace(2);
+ RealPN->addIncoming(LHS.first, LHSBlock);
+ RealPN->addIncoming(RHS.first, RHSBlock);
+
+ // Create a PHI node for the imaginary part.
+ llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
+ ImagPN->reserveOperandSpace(2);
+ ImagPN->addIncoming(LHS.second, LHSBlock);
+ ImagPN->addIncoming(RHS.second, RHSBlock);
+
+ return ComplexPairTy(RealPN, ImagPN);
+}
+
+ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
+ // Emit the LHS or RHS as appropriate.
+ return Visit(E->isConditionTrue(CGF.getContext()) ? E->getLHS() :E->getRHS());
+}
+
+//===----------------------------------------------------------------------===//
+// Entry Point into this File
+//===----------------------------------------------------------------------===//
+
+/// EmitComplexExpr - Emit the computation of the specified expression of
+/// complex type, ignoring the result.
+ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E) {
+ assert(E && E->getType()->isComplexType() &&
+ "Invalid complex expression to emit");
+
+ return ComplexExprEmitter(*this).Visit(const_cast<Expr*>(E));
+}
+
+/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
+/// of complex type, storing into the specified Value*.
+void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
+ llvm::Value *DestAddr,
+ bool DestIsVolatile) {
+ assert(E && E->getType()->isComplexType() &&
+ "Invalid complex expression to emit");
+ ComplexExprEmitter Emitter(*this);
+ ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
+ Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
+}
+
+/// LoadComplexFromAddr - Load a complex number from the specified address.
+ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
+ bool SrcIsVolatile) {
+ return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
+}
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