void DAGTypeLegalizer::ExpandRes_BIT_CONVERT(SDNode *N, SDValue &Lo,
SDValue &Hi) {
MVT OutVT = N->getValueType(0);
MVT NOutVT = TLI.getTypeToTransformTo(OutVT);
SDValue InOp = N->getOperand(0);
MVT InVT = InOp.getValueType();
DebugLoc dl = N->getDebugLoc();
// Handle some special cases efficiently.
switch (getTypeAction(InVT)) {
default:
assert(false && "Unknown type action!");
case Legal:
case PromoteInteger:
break;
case SoftenFloat:
// Convert the integer operand instead.
SplitInteger(GetSoftenedFloat(InOp), Lo, Hi);
Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
return;
case ExpandInteger:
case ExpandFloat:
// Convert the expanded pieces of the input.
GetExpandedOp(InOp, Lo, Hi);
Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
return;
case SplitVector:
// Convert the split parts of the input if it was split in two.
GetSplitVector(InOp, Lo, Hi);
if (Lo.getValueType() == Hi.getValueType()) {
if (TLI.isBigEndian())
std::swap(Lo, Hi);
Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
return;
}
break;
case ScalarizeVector:
// Convert the element instead.
SplitInteger(BitConvertToInteger(GetScalarizedVector(InOp)), Lo, Hi);
Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
return;
case WidenVector: {
assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BIT_CONVERT");
InOp = GetWidenedVector(InOp);
MVT InNVT = MVT::getVectorVT(InVT.getVectorElementType(),
InVT.getVectorNumElements()/2);
Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
DAG.getIntPtrConstant(0));
Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
DAG.getIntPtrConstant(InNVT.getVectorNumElements()));
if (TLI.isBigEndian())
std::swap(Lo, Hi);
Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
return;
}
}
// Lower the bit-convert to a store/load from the stack.
assert(NOutVT.isByteSized() && "Expanded type not byte sized!");
// Create the stack frame object. Make sure it is aligned for both
// the source and expanded destination types.
unsigned Alignment =
TLI.getTargetData()->getPrefTypeAlignment(NOutVT.getTypeForMVT());
SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment);
int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
const Value *SV = PseudoSourceValue::getFixedStack(SPFI);
// Emit a store to the stack slot.
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, SV, 0);
// Load the first half from the stack slot.
Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, SV, 0);
// Increment the pointer to the other half.
unsigned IncrementSize = NOutVT.getSizeInBits() / 8;
StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
DAG.getIntPtrConstant(IncrementSize));
// Load the second half from the stack slot.
Hi = DAG.getLoad(NOutVT, dl, Store, StackPtr, SV, IncrementSize, false,
MinAlign(Alignment, IncrementSize));
// Handle endianness of the load.
if (TLI.isBigEndian())
std::swap(Lo, Hi);
}
MVT MVT::getExtendedVectorVT(MVT VT, unsigned NumElements) {
MVT ResultVT;
ResultVT.LLVMTy = VectorType::get(VT.getTypeForMVT(), NumElements);
assert(ResultVT.isExtended() && "Type is not extended!");
return ResultVT;
}
