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implement complex division 

llvm-svn: 41457
This commit is contained in:
Chris Lattner 2007-08-26 21:24:19 +00:00
parent 2b9ec7ff33
commit 6f672c150c
1 changed files with 39 additions and 0 deletions
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39
clang/CodeGen/CGExprComplex.cpp
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@ -117,6 +117,7 @@ public:
ComplexPairTy VisitBinMul (const BinaryOperator *E);
ComplexPairTy VisitBinAdd (const BinaryOperator *E);
ComplexPairTy VisitBinSub (const BinaryOperator *E);
ComplexPairTy VisitBinDiv (const BinaryOperator *E);
// FIXME: div/rem
// GCC rejects and/or/xor for integer complex.
// Logical and/or always return int, never complex.
@ -297,6 +298,44 @@ ComplexPairTy ComplexExprEmitter::VisitBinMul(const BinaryOperator *E) {
return ComplexPairTy(ResR, ResI);
}
ComplexPairTy ComplexExprEmitter::VisitBinDiv(const BinaryOperator *E) {
ComplexPairTy LHS = Visit(E->getLHS());
ComplexPairTy RHS = Visit(E->getRHS());
llvm::Value *LHSr = LHS.first, *LHSi = LHS.second;
llvm::Value *RHSr = RHS.first, *RHSi = 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 {
QualType ExprTy = E->getType().getCanonicalType();
if (cast<ComplexType>(ExprTy)->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);
}
ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
assert(E->getLHS()->getType().getCanonicalType() ==
E->getRHS()->getType().getCanonicalType() && "Invalid assignment");