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Simplify mem{cpy, move, set} creation with IRBuilder.

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llvm-svn: 122634
This commit is contained in:
Benjamin Kramer
2010-12-30 00:13:21 +00:00
parent 7bcde197d7
commit acc6b4e2fd
8 changed files with 30 additions and 108 deletions
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19
clang/lib/CodeGen/CodeGenFunction.cpp
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@@ -534,22 +534,20 @@ CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
// Cast the dest ptr to the appropriate i8 pointer type.
unsigned DestAS =
cast<llvm::PointerType>(DestPtr->getType())->getAddressSpace();
const llvm::Type *BP =
llvm::Type::getInt8PtrTy(VMContext, DestAS);
const llvm::Type *BP = Builder.getInt8PtrTy(DestAS);
if (DestPtr->getType() != BP)
DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp");
// Get size and alignment info for this aggregate.
std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty);
uint64_t Size = TypeInfo.first;
unsigned Align = TypeInfo.second;
uint64_t Size = TypeInfo.first / 8;
unsigned Align = TypeInfo.second / 8;
// Don't bother emitting a zero-byte memset.
if (Size == 0)
return;
llvm::ConstantInt *SizeVal = llvm::ConstantInt::get(IntPtrTy, Size / 8);
llvm::ConstantInt *AlignVal = Builder.getInt32(Align / 8);
llvm::ConstantInt *SizeVal = llvm::ConstantInt::get(IntPtrTy, Size);
// If the type contains a pointer to data member we can't memset it to zero.
// Instead, create a null constant and copy it to the destination.
@@ -567,10 +565,7 @@ CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
// FIXME: variable-size types?
// Get and call the appropriate llvm.memcpy overload.
llvm::Constant *Memcpy =
CGM.getMemCpyFn(DestPtr->getType(), SrcPtr->getType(), IntPtrTy);
Builder.CreateCall5(Memcpy, DestPtr, SrcPtr, SizeVal, AlignVal,
/*volatile*/ Builder.getFalse());
Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, Align, false);
return;
}
@@ -579,9 +574,7 @@ CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
// handled above) are guaranteed to have a bit pattern of all zeros.
// FIXME: Handle variable sized types.
Builder.CreateCall5(CGM.getMemSetFn(BP, IntPtrTy), DestPtr,
Builder.getInt8(0),
SizeVal, AlignVal, /*volatile*/ Builder.getFalse());
Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal, Align, false);
}
llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelStmt *L) {