SDValue XCoreSelectionDAGInfo::
EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
bool isVolatile, bool AlwaysInline,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo) const
{
unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
// Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
if (!AlwaysInline && (Align & 3) == 0 &&
DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
const TargetLowering &TLI = *DAG.getTarget().getTargetLowering();
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = TLI.getDataLayout()->getIntPtrType(*DAG.getContext());
Entry.Node = Dst; Args.push_back(Entry);
Entry.Node = Src; Args.push_back(Entry);
Entry.Node = Size; Args.push_back(Entry);
TargetLowering::CallLoweringInfo CLI(DAG);
CLI.setDebugLoc(dl).setChain(Chain)
.setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
Type::getVoidTy(*DAG.getContext()),
DAG.getExternalSymbol("__memcpy_4", TLI.getPointerTy()),
&Args, 0)
.setDiscardResult();
std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
return CallResult.second;
}
// Otherwise have the target-independent code call memcpy.
return SDValue();
}
