SDValue Cpu0TargetLowering::
LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const
{
// If the relocation model is PIC, use the General Dynamic TLS Model or
// Local Dynamic TLS model, otherwise use the Initial Exec or
// Local Exec TLS Model.
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
DebugLoc dl = GA->getDebugLoc();
const GlobalValue *GV = GA->getGlobal();
EVT PtrVT = getPointerTy();
if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
// General Dynamic TLS Model
bool LocalDynamic = GV->hasInternalLinkage();
unsigned Flag = LocalDynamic ? Cpu0II::MO_TLSLDM :Cpu0II::MO_TLSGD;
SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, Flag);
SDValue Argument = DAG.getNode(Cpu0ISD::Wrapper, dl, PtrVT,
GetGlobalReg(DAG, PtrVT), TGA);
unsigned PtrSize = PtrVT.getSizeInBits();
IntegerType *PtrTy = Type::getIntNTy(*DAG.getContext(), PtrSize);
SDValue TlsGetAddr = DAG.getExternalSymbol("__tls_get_addr", PtrVT);
ArgListTy Args;
ArgListEntry Entry;
Entry.Node = Argument;
Entry.Ty = PtrTy;
Args.push_back(Entry);
std::pair<SDValue, SDValue> CallResult =
LowerCallTo(DAG.getEntryNode(), PtrTy,
false, false, false, false, 0, CallingConv::C,
/*isTailCall=*/false, /*doesNotRet=*/false,
/*isReturnValueUsed=*/true,
TlsGetAddr, Args, DAG, dl);
SDValue Ret = CallResult.first;
if (!LocalDynamic)
return Ret;
SDValue TGAHi = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
Cpu0II::MO_DTPREL_HI);
SDValue Hi = DAG.getNode(Cpu0ISD::Hi, dl, PtrVT, TGAHi);
SDValue TGALo = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
Cpu0II::MO_DTPREL_LO);
SDValue Lo = DAG.getNode(Cpu0ISD::Lo, dl, PtrVT, TGALo);
SDValue Add = DAG.getNode(ISD::ADD, dl, PtrVT, Hi, Ret);
return DAG.getNode(ISD::ADD, dl, PtrVT, Add, Lo);
}
SDValue Offset;
if (GV->isDeclaration()) {
// Initial Exec TLS Model
SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
Cpu0II::MO_GOTTPREL);
TGA = DAG.getNode(Cpu0ISD::Wrapper, dl, PtrVT, GetGlobalReg(DAG, PtrVT),
TGA);
Offset = DAG.getLoad(PtrVT, dl,
DAG.getEntryNode(), TGA, MachinePointerInfo(),
false, false, false, 0);
} else {
// Local Exec TLS Model
SDValue TGAHi = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
Cpu0II::MO_TPREL_HI);
SDValue TGALo = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
Cpu0II::MO_TPREL_LO);
SDValue Hi = DAG.getNode(Cpu0ISD::Hi, dl, PtrVT, TGAHi);
SDValue Lo = DAG.getNode(Cpu0ISD::Lo, dl, PtrVT, TGALo);
Offset = DAG.getNode(ISD::ADD, dl, PtrVT, Hi, Lo);
}
SDValue ThreadPointer = DAG.getNode(Cpu0ISD::ThreadPointer, dl, PtrVT);
return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
}
