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Minor optimization to skip null check in generated code where it isn't 

necessary.

llvm-svn: 86741
This commit is contained in:
Eli Friedman 2009-11-10 22:42:26 +00:00
parent 9518fbb54e
commit 0960059c0c
1 changed files with 11 additions and 9 deletions
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20
clang/lib/CodeGen/CGCXXClass.cpp
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@ -127,7 +127,14 @@ CodeGenFunction::GetAddressCXXOfBaseClass(llvm::Value *BaseValue,
// Just cast back.
return Builder.CreateBitCast(BaseValue, BasePtrTy);
}
llvm::Value *Offset =
GetCXXBaseClassOffset(*this, BaseValue, ClassDecl, BaseClassDecl);
// If there is no offset, simply cast the pointer and return it.
if (!Offset)
return Builder.CreateBitCast(BaseValue, BasePtrTy);
llvm::BasicBlock *CastNull = 0;
llvm::BasicBlock *CastNotNull = 0;
llvm::BasicBlock *CastEnd = 0;
@ -145,15 +152,10 @@ CodeGenFunction::GetAddressCXXOfBaseClass(llvm::Value *BaseValue,
}
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
llvm::Value *Offset =
GetCXXBaseClassOffset(*this, BaseValue, ClassDecl, BaseClassDecl);
if (Offset) {
// Apply the offset.
BaseValue = Builder.CreateBitCast(BaseValue, Int8PtrTy);
BaseValue = Builder.CreateGEP(BaseValue, Offset, "add.ptr");
}
// Apply the offset.
BaseValue = Builder.CreateBitCast(BaseValue, Int8PtrTy);
BaseValue = Builder.CreateGEP(BaseValue, Offset, "add.ptr");
// Cast back.
BaseValue = Builder.CreateBitCast(BaseValue, BasePtrTy);