| //===-------- LegalizeTypesGeneric.cpp - Generic type legalization --------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements generic type expansion and splitting for LegalizeTypes. |
| // The routines here perform legalization when the details of the type (such as |
| // whether it is an integer or a float) do not matter. |
| // Expansion is the act of changing a computation in an illegal type to be a |
| // computation in two identical registers of a smaller type. The Lo/Hi part |
| // is required to be stored first in memory on little/big-endian machines. |
| // Splitting is the act of changing a computation in an illegal type to be a |
| // computation in two not necessarily identical registers of a smaller type. |
| // There are no requirements on how the type is represented in memory. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "LegalizeTypes.h" |
| #include "llvm/Target/TargetData.h" |
| using namespace llvm; |
| |
| //===----------------------------------------------------------------------===// |
| // Generic Result Expansion. |
| //===----------------------------------------------------------------------===// |
| |
| // These routines assume that the Lo/Hi part is stored first in memory on |
| // little/big-endian machines, followed by the Hi/Lo part. This means that |
| // they cannot be used as is on vectors, for which Lo is always stored first. |
| void DAGTypeLegalizer::ExpandRes_MERGE_VALUES(SDNode *N, unsigned ResNo, |
| SDValue &Lo, SDValue &Hi) { |
| SDValue Op = DisintegrateMERGE_VALUES(N, ResNo); |
| GetExpandedOp(Op, Lo, Hi); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) { |
| EVT OutVT = N->getValueType(0); |
| EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT); |
| SDValue InOp = N->getOperand(0); |
| EVT InVT = InOp.getValueType(); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| // Handle some special cases efficiently. |
| switch (getTypeAction(InVT)) { |
| case TargetLowering::TypeLegal: |
| case TargetLowering::TypePromoteInteger: |
| break; |
| case TargetLowering::TypeSoftenFloat: |
| // Convert the integer operand instead. |
| SplitInteger(GetSoftenedFloat(InOp), Lo, Hi); |
| Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo); |
| Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi); |
| return; |
| case TargetLowering::TypeExpandInteger: |
| case TargetLowering::TypeExpandFloat: |
| // Convert the expanded pieces of the input. |
| GetExpandedOp(InOp, Lo, Hi); |
| Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo); |
| Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi); |
| return; |
| case TargetLowering::TypeSplitVector: |
| GetSplitVector(InOp, Lo, Hi); |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo); |
| Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi); |
| return; |
| case TargetLowering::TypeScalarizeVector: |
| // Convert the element instead. |
| SplitInteger(BitConvertToInteger(GetScalarizedVector(InOp)), Lo, Hi); |
| Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo); |
| Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi); |
| return; |
| case TargetLowering::TypeWidenVector: { |
| assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BITCAST"); |
| InOp = GetWidenedVector(InOp); |
| EVT InNVT = EVT::getVectorVT(*DAG.getContext(), 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::BITCAST, dl, NOutVT, Lo); |
| Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi); |
| return; |
| } |
| } |
| |
| if (InVT.isVector() && OutVT.isInteger()) { |
| // Handle cases like i64 = BITCAST v1i64 on x86, where the operand |
| // is legal but the result is not. |
| EVT NVT = EVT::getVectorVT(*DAG.getContext(), NOutVT, 2); |
| |
| if (isTypeLegal(NVT)) { |
| SDValue CastInOp = DAG.getNode(ISD::BITCAST, dl, NVT, InOp); |
| Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp, |
| DAG.getIntPtrConstant(0)); |
| Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp, |
| DAG.getIntPtrConstant(1)); |
| |
| if (TLI.isBigEndian()) |
| std::swap(Lo, 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. |
| getTypeForEVT(*DAG.getContext())); |
| SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment); |
| int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex(); |
| MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(SPFI); |
| |
| // Emit a store to the stack slot. |
| SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, PtrInfo, |
| false, false, 0); |
| |
| // Load the first half from the stack slot. |
| Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, PtrInfo, |
| false, false, false, 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, |
| PtrInfo.getWithOffset(IncrementSize), false, |
| false, false, MinAlign(Alignment, IncrementSize)); |
| |
| // Handle endianness of the load. |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_BUILD_PAIR(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| // Return the operands. |
| Lo = N->getOperand(0); |
| Hi = N->getOperand(1); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_EXTRACT_ELEMENT(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| GetExpandedOp(N->getOperand(0), Lo, Hi); |
| SDValue Part = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? |
| Hi : Lo; |
| |
| assert(Part.getValueType() == N->getValueType(0) && |
| "Type twice as big as expanded type not itself expanded!"); |
| |
| GetPairElements(Part, Lo, Hi); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| SDValue OldVec = N->getOperand(0); |
| unsigned OldElts = OldVec.getValueType().getVectorNumElements(); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| // Convert to a vector of the expanded element type, for example |
| // <3 x i64> -> <6 x i32>. |
| EVT OldVT = N->getValueType(0); |
| EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT); |
| |
| SDValue NewVec = DAG.getNode(ISD::BITCAST, dl, |
| EVT::getVectorVT(*DAG.getContext(), |
| NewVT, 2*OldElts), |
| OldVec); |
| |
| // Extract the elements at 2 * Idx and 2 * Idx + 1 from the new vector. |
| SDValue Idx = N->getOperand(1); |
| |
| // Make sure the type of Idx is big enough to hold the new values. |
| if (Idx.getValueType().bitsLT(TLI.getPointerTy())) |
| Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx); |
| |
| Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx); |
| Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx); |
| |
| Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, |
| DAG.getConstant(1, Idx.getValueType())); |
| Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx); |
| |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| assert(ISD::isNormalLoad(N) && "This routine only for normal loads!"); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| LoadSDNode *LD = cast<LoadSDNode>(N); |
| EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), LD->getValueType(0)); |
| SDValue Chain = LD->getChain(); |
| SDValue Ptr = LD->getBasePtr(); |
| unsigned Alignment = LD->getAlignment(); |
| bool isVolatile = LD->isVolatile(); |
| bool isNonTemporal = LD->isNonTemporal(); |
| bool isInvariant = LD->isInvariant(); |
| |
| assert(NVT.isByteSized() && "Expanded type not byte sized!"); |
| |
| Lo = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getPointerInfo(), |
| isVolatile, isNonTemporal, isInvariant, Alignment); |
| |
| // Increment the pointer to the other half. |
| unsigned IncrementSize = NVT.getSizeInBits() / 8; |
| Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, |
| DAG.getIntPtrConstant(IncrementSize)); |
| Hi = DAG.getLoad(NVT, dl, Chain, Ptr, |
| LD->getPointerInfo().getWithOffset(IncrementSize), |
| isVolatile, isNonTemporal, isInvariant, |
| MinAlign(Alignment, IncrementSize)); |
| |
| // Build a factor node to remember that this load is independent of the |
| // other one. |
| Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1), |
| Hi.getValue(1)); |
| |
| // Handle endianness of the load. |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| |
| // Modified the chain - switch anything that used the old chain to use |
| // the new one. |
| ReplaceValueWith(SDValue(N, 1), Chain); |
| } |
| |
| void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) { |
| EVT OVT = N->getValueType(0); |
| EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT); |
| SDValue Chain = N->getOperand(0); |
| SDValue Ptr = N->getOperand(1); |
| DebugLoc dl = N->getDebugLoc(); |
| const unsigned Align = N->getConstantOperandVal(3); |
| |
| Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align); |
| Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2), 0); |
| |
| // Handle endianness of the load. |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| |
| // Modified the chain - switch anything that used the old chain to use |
| // the new one. |
| ReplaceValueWith(SDValue(N, 1), Hi.getValue(1)); |
| } |
| |
| |
| //===--------------------------------------------------------------------===// |
| // Generic Operand Expansion. |
| //===--------------------------------------------------------------------===// |
| |
| SDValue DAGTypeLegalizer::ExpandOp_BITCAST(SDNode *N) { |
| DebugLoc dl = N->getDebugLoc(); |
| if (N->getValueType(0).isVector()) { |
| // An illegal expanding type is being converted to a legal vector type. |
| // Make a two element vector out of the expanded parts and convert that |
| // instead, but only if the new vector type is legal (otherwise there |
| // is no point, and it might create expansion loops). For example, on |
| // x86 this turns v1i64 = BITCAST i64 into v1i64 = BITCAST v2i32. |
| EVT OVT = N->getOperand(0).getValueType(); |
| EVT NVT = EVT::getVectorVT(*DAG.getContext(), |
| TLI.getTypeToTransformTo(*DAG.getContext(), OVT), |
| 2); |
| |
| if (isTypeLegal(NVT)) { |
| SDValue Parts[2]; |
| GetExpandedOp(N->getOperand(0), Parts[0], Parts[1]); |
| |
| if (TLI.isBigEndian()) |
| std::swap(Parts[0], Parts[1]); |
| |
| SDValue Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, NVT, Parts, 2); |
| return DAG.getNode(ISD::BITCAST, dl, N->getValueType(0), Vec); |
| } |
| } |
| |
| // Otherwise, store to a temporary and load out again as the new type. |
| return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0)); |
| } |
| |
| SDValue DAGTypeLegalizer::ExpandOp_BUILD_VECTOR(SDNode *N) { |
| // The vector type is legal but the element type needs expansion. |
| EVT VecVT = N->getValueType(0); |
| unsigned NumElts = VecVT.getVectorNumElements(); |
| EVT OldVT = N->getOperand(0).getValueType(); |
| EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| assert(OldVT == VecVT.getVectorElementType() && |
| "BUILD_VECTOR operand type doesn't match vector element type!"); |
| |
| // Build a vector of twice the length out of the expanded elements. |
| // For example <3 x i64> -> <6 x i32>. |
| std::vector<SDValue> NewElts; |
| NewElts.reserve(NumElts*2); |
| |
| for (unsigned i = 0; i < NumElts; ++i) { |
| SDValue Lo, Hi; |
| GetExpandedOp(N->getOperand(i), Lo, Hi); |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| NewElts.push_back(Lo); |
| NewElts.push_back(Hi); |
| } |
| |
| SDValue NewVec = DAG.getNode(ISD::BUILD_VECTOR, dl, |
| EVT::getVectorVT(*DAG.getContext(), |
| NewVT, NewElts.size()), |
| &NewElts[0], NewElts.size()); |
| |
| // Convert the new vector to the old vector type. |
| return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec); |
| } |
| |
| SDValue DAGTypeLegalizer::ExpandOp_EXTRACT_ELEMENT(SDNode *N) { |
| SDValue Lo, Hi; |
| GetExpandedOp(N->getOperand(0), Lo, Hi); |
| return cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? Hi : Lo; |
| } |
| |
| SDValue DAGTypeLegalizer::ExpandOp_INSERT_VECTOR_ELT(SDNode *N) { |
| // The vector type is legal but the element type needs expansion. |
| EVT VecVT = N->getValueType(0); |
| unsigned NumElts = VecVT.getVectorNumElements(); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| SDValue Val = N->getOperand(1); |
| EVT OldEVT = Val.getValueType(); |
| EVT NewEVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldEVT); |
| |
| assert(OldEVT == VecVT.getVectorElementType() && |
| "Inserted element type doesn't match vector element type!"); |
| |
| // Bitconvert to a vector of twice the length with elements of the expanded |
| // type, insert the expanded vector elements, and then convert back. |
| EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewEVT, NumElts*2); |
| SDValue NewVec = DAG.getNode(ISD::BITCAST, dl, |
| NewVecVT, N->getOperand(0)); |
| |
| SDValue Lo, Hi; |
| GetExpandedOp(Val, Lo, Hi); |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| |
| SDValue Idx = N->getOperand(2); |
| Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx); |
| NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Lo, Idx); |
| Idx = DAG.getNode(ISD::ADD, dl, |
| Idx.getValueType(), Idx, DAG.getIntPtrConstant(1)); |
| NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Hi, Idx); |
| |
| // Convert the new vector to the old vector type. |
| return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec); |
| } |
| |
| SDValue DAGTypeLegalizer::ExpandOp_SCALAR_TO_VECTOR(SDNode *N) { |
| DebugLoc dl = N->getDebugLoc(); |
| EVT VT = N->getValueType(0); |
| assert(VT.getVectorElementType() == N->getOperand(0).getValueType() && |
| "SCALAR_TO_VECTOR operand type doesn't match vector element type!"); |
| unsigned NumElts = VT.getVectorNumElements(); |
| SmallVector<SDValue, 16> Ops(NumElts); |
| Ops[0] = N->getOperand(0); |
| SDValue UndefVal = DAG.getUNDEF(Ops[0].getValueType()); |
| for (unsigned i = 1; i < NumElts; ++i) |
| Ops[i] = UndefVal; |
| return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], NumElts); |
| } |
| |
| SDValue DAGTypeLegalizer::ExpandOp_NormalStore(SDNode *N, unsigned OpNo) { |
| assert(ISD::isNormalStore(N) && "This routine only for normal stores!"); |
| assert(OpNo == 1 && "Can only expand the stored value so far"); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| StoreSDNode *St = cast<StoreSDNode>(N); |
| EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), |
| St->getValue().getValueType()); |
| SDValue Chain = St->getChain(); |
| SDValue Ptr = St->getBasePtr(); |
| unsigned Alignment = St->getAlignment(); |
| bool isVolatile = St->isVolatile(); |
| bool isNonTemporal = St->isNonTemporal(); |
| |
| assert(NVT.isByteSized() && "Expanded type not byte sized!"); |
| unsigned IncrementSize = NVT.getSizeInBits() / 8; |
| |
| SDValue Lo, Hi; |
| GetExpandedOp(St->getValue(), Lo, Hi); |
| |
| if (TLI.isBigEndian()) |
| std::swap(Lo, Hi); |
| |
| Lo = DAG.getStore(Chain, dl, Lo, Ptr, St->getPointerInfo(), |
| isVolatile, isNonTemporal, Alignment); |
| |
| Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, |
| DAG.getIntPtrConstant(IncrementSize)); |
| assert(isTypeLegal(Ptr.getValueType()) && "Pointers must be legal!"); |
| Hi = DAG.getStore(Chain, dl, Hi, Ptr, |
| St->getPointerInfo().getWithOffset(IncrementSize), |
| isVolatile, isNonTemporal, |
| MinAlign(Alignment, IncrementSize)); |
| |
| return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi); |
| } |
| |
| |
| //===--------------------------------------------------------------------===// |
| // Generic Result Splitting. |
| //===--------------------------------------------------------------------===// |
| |
| // Be careful to make no assumptions about which of Lo/Hi is stored first in |
| // memory (for vectors it is always Lo first followed by Hi in the following |
| // bytes; for integers and floats it is Lo first if and only if the machine is |
| // little-endian). |
| |
| void DAGTypeLegalizer::SplitRes_MERGE_VALUES(SDNode *N, unsigned ResNo, |
| SDValue &Lo, SDValue &Hi) { |
| SDValue Op = DisintegrateMERGE_VALUES(N, ResNo); |
| GetSplitOp(Op, Lo, Hi); |
| } |
| |
| void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| SDValue LL, LH, RL, RH, CL, CH; |
| DebugLoc dl = N->getDebugLoc(); |
| GetSplitOp(N->getOperand(1), LL, LH); |
| GetSplitOp(N->getOperand(2), RL, RH); |
| |
| SDValue Cond = N->getOperand(0); |
| CL = CH = Cond; |
| if (Cond.getValueType().isVector()) { |
| assert(Cond.getValueType().getVectorElementType() == MVT::i1 && |
| "Condition legalized before result?"); |
| unsigned NumElements = Cond.getValueType().getVectorNumElements(); |
| EVT VCondTy = EVT::getVectorVT(*DAG.getContext(), MVT::i1, NumElements / 2); |
| CL = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond, |
| DAG.getIntPtrConstant(0)); |
| CH = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond, |
| DAG.getIntPtrConstant(NumElements / 2)); |
| } |
| |
| Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), CL, LL, RL); |
| Hi = DAG.getNode(N->getOpcode(), dl, LH.getValueType(), CH, LH, RH); |
| } |
| |
| void DAGTypeLegalizer::SplitRes_SELECT_CC(SDNode *N, SDValue &Lo, |
| SDValue &Hi) { |
| SDValue LL, LH, RL, RH; |
| DebugLoc dl = N->getDebugLoc(); |
| GetSplitOp(N->getOperand(2), LL, LH); |
| GetSplitOp(N->getOperand(3), RL, RH); |
| |
| Lo = DAG.getNode(ISD::SELECT_CC, dl, LL.getValueType(), N->getOperand(0), |
| N->getOperand(1), LL, RL, N->getOperand(4)); |
| Hi = DAG.getNode(ISD::SELECT_CC, dl, LH.getValueType(), N->getOperand(0), |
| N->getOperand(1), LH, RH, N->getOperand(4)); |
| } |
| |
| void DAGTypeLegalizer::SplitRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi) { |
| EVT LoVT, HiVT; |
| GetSplitDestVTs(N->getValueType(0), LoVT, HiVT); |
| Lo = DAG.getUNDEF(LoVT); |
| Hi = DAG.getUNDEF(HiVT); |
| } |
