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When doing a derived-to-base class and the class offset is 0 we can just do a simple bitcast. 

llvm-svn: 82579
This commit is contained in:
Anders Carlsson 2009-09-22 21:58:22 +00:00
parent 03184798c3
commit 8fef09cd80
1 changed files with 10 additions and 7 deletions
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17
clang/lib/CodeGen/CGCXXClass.cpp
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@ -77,10 +77,18 @@ CodeGenFunction::GetAddressCXXOfBaseClass(llvm::Value *BaseValue,
if (ClassDecl == BaseClassDecl)
return BaseValue;
QualType BTy =
getContext().getCanonicalType(
getContext().getTypeDeclType(const_cast<CXXRecordDecl*>(BaseClassDecl)));
const llvm::Type *BasePtrTy = llvm::PointerType::getUnqual(ConvertType(BTy));
uint64_t Offset = ComputeBaseClassOffset(getContext(),
ClassDecl, BaseClassDecl);
if (!Offset) {
// Just cast back.
return Builder.CreateBitCast(BaseValue, BasePtrTy);
}
llvm::BasicBlock *CastNull = 0;
llvm::BasicBlock *CastNotNull = 0;
llvm::BasicBlock *CastEnd = 0;
@ -108,13 +116,8 @@ CodeGenFunction::GetAddressCXXOfBaseClass(llvm::Value *BaseValue,
BaseValue = Builder.CreateBitCast(BaseValue, Int8PtrTy);
BaseValue = Builder.CreateGEP(BaseValue, OffsetVal, "add.ptr");
QualType BTy =
getContext().getCanonicalType(
getContext().getTypeDeclType(const_cast<CXXRecordDecl*>(BaseClassDecl)));
// Cast back.
const llvm::Type *BasePtr = llvm::PointerType::getUnqual(ConvertType(BTy));
BaseValue = Builder.CreateBitCast(BaseValue, BasePtr);
BaseValue = Builder.CreateBitCast(BaseValue, BasePtrTy);
if (NullCheckValue) {
Builder.CreateBr(CastEnd);