void VDAGToDAGISel::LowerMemAccessISel(SDNode *N, SelectionDAG &DAG,
bool isStore) {
LSBaseSDNode *LSNode = cast<LSBaseSDNode>(N);
// FIXME: Handle the index.
assert(LSNode->isUnindexed() && "Indexed load/store is not supported!");
EVT VT = LSNode->getMemoryVT();
unsigned VTSize = VT.getSizeInBits();
SDValue StoreVal = isStore ? cast<StoreSDNode>(LSNode)->getValue()
: DAG.getUNDEF(VT);
LLVMContext *Cntx = DAG.getContext();
EVT CmdVT = EVT::getIntegerVT(*Cntx, VFUMemBus::CMDWidth);
SDValue SDOps[] = {// The chain.
LSNode->getChain(),
// The Value to store (if any), and the address.
LSNode->getBasePtr(), StoreVal,
// Is load?
DAG.getTargetConstant(isStore, CmdVT),
// Byte enable.
DAG.getTargetConstant(getByteEnable(VT.getStoreSize()),
MVT::i8)
};
unsigned DataBusWidth = getFUDesc<VFUMemBus>()->getDataWidth();
MachineMemOperand *MemOp = LSNode->getMemOperand();
if (unsigned AS = MemOp->getPointerInfo().getAddrSpace()) {
VFInfo *VFI = DAG.getMachineFunction().getInfo<VFInfo>();
DataBusWidth = VFI->getBRamInfo(AS).ElemSizeInBytes * 8;
}
assert(DataBusWidth >= VTSize && "Unexpected large data!");
MVT DataBusVT =
EVT::getIntegerVT(*DAG.getContext(), DataBusWidth).getSimpleVT();
DebugLoc dl = N->getDebugLoc();
SDValue Result =
DAG.getMemIntrinsicNode(VTMISD::MemAccess, dl,
// Result and the chain.
DAG.getVTList(DataBusVT, MVT::Other),
// SDValue operands
SDOps, array_lengthof(SDOps),
// Memory operands.
LSNode->getMemoryVT(), MemOp);
if (isStore) {
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Result.getValue(1));
return;
}
SDValue Val = Result;
// Truncate the data bus, the system bus should place the valid data start
// from LSM.
if (DataBusWidth > VTSize)
Val = VTargetLowering::getTruncate(DAG, dl, Result, VTSize);
// Check if this an extend load.
LoadSDNode *LD = cast<LoadSDNode>(LSNode);
ISD::LoadExtType ExtType = LD->getExtensionType();
if (ExtType != ISD::NON_EXTLOAD) {
unsigned DstSize = LD->getValueSizeInBits(0);
Val = VTargetLowering::getExtend(DAG, dl, Val, DstSize,
ExtType == ISD::SEXTLOAD);
}
// Do we need to replace the result of the load operation?
SDValue NewValues[] = { Val, Result.getValue(1) };
DAG.ReplaceAllUsesWith(N, NewValues);
}
