-//===-- PIC16ISelLowering.cpp - PIC16 DAG Lowering Implementation ---------===//
//
// The LLVM Compiler Infrastructure
//
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalValue.h"
#include "llvm/Function.h"
+#include "llvm/CallingConv.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
#include <cstdio>
setShiftAmountType(MVT::i8);
setShiftAmountFlavor(Extend);
+ // SRA library call names
+ setPIC16LibcallName(PIC16ISD::SRA_I8, "__intrinsics.sra.i8");
+ setLibcallName(RTLIB::SRA_I16, "__intrinsics.sra.i16");
+ setLibcallName(RTLIB::SRA_I32, "__intrinsics.sra.i32");
+
+ // SHL library call names
+ setPIC16LibcallName(PIC16ISD::SLL_I8, "__intrinsics.sll.i8");
+ setLibcallName(RTLIB::SHL_I16, "__intrinsics.sll.i16");
+ setLibcallName(RTLIB::SHL_I32, "__intrinsics.sll.i32");
+
+ // SRL library call names
+ setPIC16LibcallName(PIC16ISD::SRL_I8, "__intrinsics.srl.i8");
+ setLibcallName(RTLIB::SRL_I16, "__intrinsics.srl.i16");
+ setLibcallName(RTLIB::SRL_I32, "__intrinsics.srl.i32");
+
+ // MUL Library call names
+ setPIC16LibcallName(PIC16ISD::MUL_I8, "__intrinsics.mul.i8");
+ setLibcallName(RTLIB::MUL_I16, "__intrinsics.mul.i16");
+ setLibcallName(RTLIB::MUL_I32, "__intrinsics.mul.i32");
setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
+ setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
setOperationAction(ISD::LOAD, MVT::i8, Legal);
setOperationAction(ISD::LOAD, MVT::i16, Custom);
setOperationAction(ISD::ADDC, MVT::i8, Custom);
setOperationAction(ISD::SUBE, MVT::i8, Custom);
setOperationAction(ISD::SUBC, MVT::i8, Custom);
- setOperationAction(ISD::ADD, MVT::i8, Legal);
+ setOperationAction(ISD::ADD, MVT::i8, Custom);
setOperationAction(ISD::ADD, MVT::i16, Custom);
setOperationAction(ISD::OR, MVT::i8, Custom);
setOperationAction(ISD::AND, MVT::i8, Custom);
setOperationAction(ISD::XOR, MVT::i8, Custom);
- setOperationAction(ISD::SHL, MVT::i16, Custom);
- setOperationAction(ISD::SHL, MVT::i32, Custom);
+ setOperationAction(ISD::FrameIndex, MVT::i16, Custom);
+ setOperationAction(ISD::CALL, MVT::i16, Custom);
+ setOperationAction(ISD::RET, MVT::Other, Custom);
+
+ setOperationAction(ISD::MUL, MVT::i8, Custom);
+ setOperationAction(ISD::MUL, MVT::i16, Expand);
+ setOperationAction(ISD::MUL, MVT::i32, Expand);
+
+ setOperationAction(ISD::SMUL_LOHI, MVT::i8, Expand);
+ setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand);
+ setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
+ setOperationAction(ISD::UMUL_LOHI, MVT::i8, Expand);
+ setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand);
+ setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
+ setOperationAction(ISD::MULHU, MVT::i8, Expand);
+ setOperationAction(ISD::MULHU, MVT::i16, Expand);
+ setOperationAction(ISD::MULHU, MVT::i32, Expand);
+ setOperationAction(ISD::MULHS, MVT::i8, Expand);
+ setOperationAction(ISD::MULHS, MVT::i16, Expand);
+ setOperationAction(ISD::MULHS, MVT::i32, Expand);
+
+ setOperationAction(ISD::SRA, MVT::i8, Custom);
+ setOperationAction(ISD::SRA, MVT::i16, Expand);
+ setOperationAction(ISD::SRA, MVT::i32, Expand);
+ setOperationAction(ISD::SHL, MVT::i8, Custom);
+ setOperationAction(ISD::SHL, MVT::i16, Expand);
+ setOperationAction(ISD::SHL, MVT::i32, Expand);
+ setOperationAction(ISD::SRL, MVT::i8, Custom);
+ setOperationAction(ISD::SRL, MVT::i16, Expand);
+ setOperationAction(ISD::SRL, MVT::i32, Expand);
+
+ // PIC16 does not support shift parts
+ setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
+ setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand);
+ setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
+ setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
+ setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand);
+ setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
+ setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
+ setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand);
+ setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
+
+
+ // PIC16 does not have a SETCC, expand it to SELECT_CC.
+ setOperationAction(ISD::SETCC, MVT::i8, Expand);
+ setOperationAction(ISD::SELECT, MVT::i8, Expand);
+ setOperationAction(ISD::BRCOND, MVT::Other, Expand);
+ setOperationAction(ISD::BRIND, MVT::Other, Expand);
+
+ setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
+ setOperationAction(ISD::BR_CC, MVT::i8, Custom);
//setOperationAction(ISD::TRUNCATE, MVT::i16, Custom);
setTruncStoreAction(MVT::i16, MVT::i8, Custom);
computeRegisterProperties();
}
+static void PopulateResults(SDValue N, SmallVectorImpl<SDValue>&Results) {
+ if (N.getOpcode() == ISD::MERGE_VALUES) {
+ int NumResults = N.getNumOperands();
+ for( int i = 0; i < NumResults; i++)
+ Results.push_back(N.getOperand(i));
+ }
+ else
+ Results.push_back(N);
+}
+
+MVT PIC16TargetLowering::getSetCCResultType(MVT ValType) const {
+ return MVT::i8;
+}
+
+
+void
+PIC16TargetLowering::setPIC16LibcallName(PIC16ISD::PIC16Libcall Call,
+ const char *Name) {
+ PIC16LibcallNames[Call] = Name;
+}
+
+const char *
+PIC16TargetLowering::getPIC16LibcallName(PIC16ISD::PIC16Libcall Call) {
+ return PIC16LibcallNames[Call];
+}
+
+SDValue
+PIC16TargetLowering::MakePIC16Libcall(PIC16ISD::PIC16Libcall Call,
+ MVT RetVT, const SDValue *Ops,
+ unsigned NumOps, bool isSigned,
+ SelectionDAG &DAG, DebugLoc dl) {
+
+ TargetLowering::ArgListTy Args;
+ Args.reserve(NumOps);
+
+ TargetLowering::ArgListEntry Entry;
+ for (unsigned i = 0; i != NumOps; ++i) {
+ Entry.Node = Ops[i];
+ Entry.Ty = Entry.Node.getValueType().getTypeForMVT();
+ Entry.isSExt = isSigned;
+ Entry.isZExt = !isSigned;
+ Args.push_back(Entry);
+ }
+ SDValue Callee = DAG.getExternalSymbol(getPIC16LibcallName(Call), MVT::i8);
+
+ const Type *RetTy = RetVT.getTypeForMVT();
+ std::pair<SDValue,SDValue> CallInfo =
+ LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
+ false, CallingConv::C, false, Callee, Args, DAG, dl);
+
+ return CallInfo.first;
+}
+
+SDValue
+PIC16TargetLowering::getCurrentFrame(SelectionDAG &DAG) {
+ MachineFunction &MF = DAG.getMachineFunction();
+ const Function *Func = MF.getFunction();
+ const std::string FuncName = Func->getName();
+
+ // this is causing memory waste
+ // because for every call new memory will be allocated
+ char *tmpName = new char [strlen(FuncName.c_str()) + 6];
+ sprintf(tmpName, "%s.tmp", FuncName.c_str());
+
+ // if the external symbol of the same name already exists then
+ // it will not create the new one.
+ return DAG.getTargetExternalSymbol(tmpName, MVT::i8);
+}
+
+void
+PIC16TargetLowering::getCurrentFrameIndex(SelectionDAG &DAG, SDValue &ES,
+ unsigned SlotSize, int &FromFI) {
+ MachineFunction &MF = DAG.getMachineFunction();
+ const Function *Func = MF.getFunction();
+ const std::string FuncName = Func->getName();
+
+ // this is causing memory waste
+ // because for every call new memory will be allocated
+ char *tmpName = new char [strlen(FuncName.c_str()) + 6];
+ sprintf(tmpName, "%s.tmp", FuncName.c_str());
+
+ // if the external symbol of the same name already exists then
+ // it will not create the new one.
+ ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
+
+ // Alignment is always 1
+ //FromFI = MF.getFrameInfo()->CreateStackObject(SlotSize, 1);
+ FromFI = MF.getFrameInfo()->CreateStackObject(1, 1);
+ int FI;
+ for(unsigned i=1;i<SlotSize; ++i) {
+ FI = MF.getFrameInfo()->CreateStackObject(1, 1);
+ }
+}
+
const char *PIC16TargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return NULL;
case PIC16ISD::MTHI: return "PIC16ISD::MTHI";
case PIC16ISD::Banksel: return "PIC16ISD::Banksel";
case PIC16ISD::PIC16Load: return "PIC16ISD::PIC16Load";
+ case PIC16ISD::PIC16LdWF: return "PIC16ISD::PIC16LdWF";
case PIC16ISD::PIC16Store: return "PIC16ISD::PIC16Store";
+ case PIC16ISD::PIC16StWF: return "PIC16ISD::PIC16StWF";
case PIC16ISD::BCF: return "PIC16ISD::BCF";
case PIC16ISD::LSLF: return "PIC16ISD::LSLF";
case PIC16ISD::LRLF: return "PIC16ISD::LRLF";
case PIC16ISD::RLF: return "PIC16ISD::RLF";
case PIC16ISD::RRF: return "PIC16ISD::RRF";
+ case PIC16ISD::CALL: return "PIC16ISD::CALL";
+ case PIC16ISD::SUBCC: return "PIC16ISD::SUBCC";
+ case PIC16ISD::SELECT_ICC: return "PIC16ISD::SELECT_ICC";
+ case PIC16ISD::BRCOND: return "PIC16ISD::BRCOND";
case PIC16ISD::Dummy: return "PIC16ISD::Dummy";
}
}
void PIC16TargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) {
+
switch (N->getOpcode()) {
case ISD::GlobalAddress:
Results.push_back(ExpandGlobalAddress(N, DAG));
return;
+ case ISD::ExternalSymbol:
+ Results.push_back(ExpandExternalSymbol(N, DAG));
+ return;
case ISD::STORE:
Results.push_back(ExpandStore(N, DAG));
return;
case ISD::LOAD:
- Results.push_back(ExpandLoad(N, DAG));
+ PopulateResults(ExpandLoad(N, DAG), Results);
return;
case ISD::ADD:
-// return ExpandAdd(N, DAG);
+ // Results.push_back(ExpandAdd(N, DAG));
return;
- case ISD::SHL: {
- SDValue Res = ExpandShift(N, DAG);
- if (Res.getNode())
- Results.push_back(Res);
+ case ISD::FrameIndex:
+ Results.push_back(ExpandFrameIndex(N, DAG));
return;
- }
default:
assert (0 && "not implemented");
return;
}
}
-SDValue PIC16TargetLowering::ExpandStore(SDNode *N, SelectionDAG &DAG) {
+SDValue PIC16TargetLowering::ExpandFrameIndex(SDNode *N, SelectionDAG &DAG) {
+
+ // Currently handling FrameIndex of size MVT::i16 only
+ // One example of this scenario is when return value is written on
+ // FrameIndex#0
+
+ if (N->getValueType(0) != MVT::i16)
+ return SDValue();
+
+ // Expand the FrameIndex into ExternalSymbol and a Constant node
+ // The constant will represent the frame index number
+ // Get the current function frame
+ MachineFunction &MF = DAG.getMachineFunction();
+ const Function *Func = MF.getFunction();
+ const std::string Name = Func->getName();
+
+ FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(SDValue(N,0));
+ int Index = FR->getIndex();
+
+ SDValue FI[2];
+ FI[0] = DAG.getTargetFrameIndex(Index, MVT::i8);
+ FI[1] = DAG.getTargetFrameIndex(Index + 1, MVT::i8);
+ return DAG.getNode(ISD::BUILD_PAIR, N->getValueType(0), FI[0], FI[1]);
+}
+
+
+SDValue PIC16TargetLowering::ExpandStore(SDNode *N, SelectionDAG &DAG) {
StoreSDNode *St = cast<StoreSDNode>(N);
SDValue Chain = St->getChain();
SDValue Src = St->getValue();
if (ValueType == MVT::i8) {
return DAG.getNode (PIC16ISD::PIC16Store, MVT::Other, Chain, Src,
- PtrLo, PtrHi, DAG.getConstant (0, MVT::i8));
+ PtrLo, PtrHi,
+ DAG.getConstant (0 + StoreOffset, MVT::i8));
}
else if (ValueType == MVT::i16) {
// Get the Lo and Hi parts from MERGE_VALUE or BUILD_PAIR.
getChain(Store2));
SDValue RetHi = DAG.getNode(ISD::TokenFactor, MVT::Other, getChain(Store3),
getChain(Store4));
- return DAG.getNode(ISD::TokenFactor, MVT::Other, RetLo, RetHi);
+ return DAG.getNode(ISD::TokenFactor, MVT::Other, RetLo, RetHi);
+
}
else {
assert (0 && "value type not supported");
}
}
+SDValue PIC16TargetLowering::ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG)
+{
+ ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(SDValue(N, 0));
+
+ SDValue TES = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
+
+ SDValue Lo = DAG.getNode(PIC16ISD::Lo, MVT::i8, TES);
+ SDValue Hi = DAG.getNode(PIC16ISD::Hi, MVT::i8, TES);
+
+ return DAG.getNode(ISD::BUILD_PAIR, MVT::i16, Lo, Hi);
+}
+
// ExpandGlobalAddress -
SDValue PIC16TargetLowering::ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG) {
GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(SDValue(N, 0));
SDValue Lo = DAG.getNode(PIC16ISD::Lo, MVT::i8, TGA);
SDValue Hi = DAG.getNode(PIC16ISD::Hi, MVT::i8, TGA);
- SDValue BP = DAG.getNode(ISD::BUILD_PAIR, MVT::i16, Lo, Hi);
- return BP;
+ return DAG.getNode(ISD::BUILD_PAIR, MVT::i16, Lo, Hi);
}
bool PIC16TargetLowering::isDirectAddress(const SDValue &Op) {
return false;
}
+// Extract the out flag
+SDValue PIC16TargetLowering::getOutFlag(SDValue &Op) {
+ SDValue Flag = Op.getValue(Op.getNode()->getNumValues() - 1);
+
+ assert (Flag.getValueType() == MVT::Flag && "Node does not have an out Flag");
+
+ return Flag;
+}
+
// To extract chain value from the SDValue Nodes
// This function will help to maintain the chain extracting
// code at one place. In case of any change in future it will
SDValue PIC16TargetLowering::getChain(SDValue &Op) {
SDValue Chain = Op.getValue(Op.getNode()->getNumValues() - 1);
+ // If the last value returned in Flag then the chain is
+ // second last value returned.
+ if (Chain.getValueType() == MVT::Flag)
+ Chain = Op.getValue(Op.getNode()->getNumValues() - 2);
+
// All nodes may not produce a chain. Therefore following assert
// verifies that the node is returning a chain only.
assert (Chain.getValueType() == MVT::Other && "Node does not have a chain");
}
void PIC16TargetLowering::GetExpandedParts(SDValue Op, SelectionDAG &DAG,
+
SDValue &Lo, SDValue &Hi) {
SDNode *N = Op.getNode();
- unsigned NumValues = N->getNumValues();
- std::vector<MVT> VTs;
MVT NewVT;
std::vector<SDValue> Opers;
-
- // EXTRACT_ELEMENT should have same number and type of values that the
- // node replacing the EXTRACT_ELEMENT should have. (i.e. extracted element)
- // Some nodes such as LOAD and PIC16Load have more than one values. In such
- // cases EXTRACT_ELEMENT should have more than one values. Therefore creating
- // vector of Values for EXTRACT_ELEMENT. This list will have same number of
- // values as the extracted element will have.
-
- for (unsigned i=0;i < NumValues; ++i) {
- NewVT = getTypeToTransformTo(N->getValueType(i));
- VTs.push_back(NewVT);
- }
+ NewVT = getTypeToTransformTo(N->getValueType(0));
// extract the lo component
Opers.push_back(Op);
Opers.push_back(DAG.getConstant(0,MVT::i8));
- Lo = DAG.getNode(ISD::EXTRACT_ELEMENT,VTs,&Opers[0],Opers.size());
-
+ Lo = DAG.getNode(ISD::EXTRACT_ELEMENT,NewVT,&Opers[0],Opers.size());
// extract the hi component
Opers.clear();
Opers.push_back(Op);
Opers.push_back(DAG.getConstant(1,MVT::i8));
- Hi = DAG.getNode(ISD::EXTRACT_ELEMENT,VTs,&Opers[0],Opers.size());
+ Hi = DAG.getNode(ISD::EXTRACT_ELEMENT,NewVT,&Opers[0],Opers.size());
+}
+
+// Legalize FrameIndex into ExternalSymbol and offset.
+void
+PIC16TargetLowering::LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG,
+ SDValue &ES, int &Offset) {
+
+ MachineFunction &MF = DAG.getMachineFunction();
+ const Function *Func = MF.getFunction();
+ const std::string Name = Func->getName();
+
+ char *tmpName = new char [strlen(Name.c_str()) + 8];
+ sprintf(tmpName, "%s.args", Name.c_str());
+ ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
+ FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(Op);
+ Offset = FR->getIndex();
+
+ return;
}
// This function legalizes the PIC16 Addresses. If the Pointer is
if (OperLeft.getOpcode() == ISD::Constant) {
Offset = dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue();
Ptr = OperRight;
- } else {
- Ptr = OperLeft;
+ } else if (OperRight.getOpcode() == ISD::Constant) {
Offset = dyn_cast<ConstantSDNode>(OperRight)->getZExtValue();
+ Ptr = OperLeft;
}
}
+ // If the pointer is Type i8 and an external symbol
+ // then treat it as direct address.
+ // One example for such case is storing and loading
+ // from function frame during a call
+ if (Ptr.getValueType() == MVT::i8) {
+ switch (Ptr.getOpcode()) {
+ case ISD::TargetExternalSymbol:
+ Lo = Ptr;
+ Hi = DAG.getConstant(1, MVT::i8);
+ return;
+ }
+ }
+
+ if (Ptr.getOpcode() == ISD::BUILD_PAIR &&
+ Ptr.getOperand(0).getOpcode() == ISD::TargetFrameIndex) {
+
+ int FrameOffset;
+ LegalizeFrameIndex(Ptr.getOperand(0), DAG, Lo, FrameOffset);
+ Hi = DAG.getConstant(1, MVT::i8);
+ Offset += FrameOffset;
+ return;
+ }
+
if (isDirectAddress(Ptr) && !isRomAddress(Ptr)) {
// Direct addressing case for RAM variables. The Hi part is constant
// and the Lo part is the TGA itself.
return;
}
-//SDNode *PIC16TargetLowering::ExpandAdd(SDNode *N, SelectionDAG &DAG) {
-// SDValue OperLeft = N->getOperand(0);
-// SDValue OperRight = N->getOperand(1);
-//
-// if((OperLeft.getOpcode() == ISD::Constant) ||
-// (OperRight.getOpcode() == ISD::Constant)) {
-// return NULL;
-// }
-//
-// // These case are yet to be handled
-// return NULL;
+//SDValue PIC16TargetLowering::ExpandAdd(SDNode *N, SelectionDAG &DAG) {
+ //SDValue OperLeft = N->getOperand(0);
+ //SDValue OperRight = N->getOperand(1);
+
+ //if((OperLeft.getOpcode() == ISD::Constant) ||
+ //(OperRight.getOpcode() == ISD::Constant)) {
+ //return SDValue();
+ //}
+
+ // These case are yet to be handled
+ //return SDValue();
//}
SDValue PIC16TargetLowering::ExpandLoad(SDNode *N, SelectionDAG &DAG) {
return DAG.getNode(ISD::MERGE_VALUES, Tys, BP, Chain);
}
-SDValue PIC16TargetLowering::ExpandShift(SDNode *N, SelectionDAG &DAG) {
+SDValue PIC16TargetLowering::LowerShift(SDValue Op, SelectionDAG &DAG) {
+ // We should have handled larger operands in type legalizer itself.
+ assert (Op.getValueType() == MVT::i8 && "illegal shift to lower");
+
+ SDNode *N = Op.getNode();
SDValue Value = N->getOperand(0);
SDValue Amt = N->getOperand(1);
- SDValue BCF, BCFInput;
- SDVTList Tys;
- SDValue ShfCom; // Shift Component - Lo component should be shifted
- SDValue RotCom; // Rotate Component- Hi component should be rotated
- PIC16ISD::NodeType ShfNode = PIC16ISD::Dummy, RotNode = PIC16ISD::Dummy;
-
- // Currently handling Constant shift only
- if (Amt.getOpcode() != ISD::Constant)
- return SDValue();
-
- // Following code considers 16 bit left-shift only
- if (N->getValueType(0) != MVT::i16)
+ PIC16ISD::PIC16Libcall CallCode;
+ switch (N->getOpcode()) {
+ case ISD::SRA:
+ CallCode = PIC16ISD::SRA_I8;
+ break;
+ case ISD::SHL:
+ CallCode = PIC16ISD::SLL_I8;
+ break;
+ case ISD::SRL:
+ CallCode = PIC16ISD::SRL_I8;
+ break;
+ default:
+ assert ( 0 && "This shift is not implemented yet.");
return SDValue();
-
- if (N->getOpcode() == ISD::SHL) {
- ShfNode = PIC16ISD::LSLF;
- RotNode = PIC16ISD::RLF;
- } else if (N->getOpcode() == ISD::SRL) {
- ShfNode = PIC16ISD::LRLF;
- RotNode = PIC16ISD::RRF;
}
- unsigned ShiftAmt = dyn_cast<ConstantSDNode>(Amt)->getZExtValue();
- SDValue StatusReg = DAG.getRegister(PIC16::STATUS, MVT::i8);
- // 0th Bit in StatusReg is CarryBit
- SDValue CarryBit= DAG.getConstant(0, MVT::i8);
-
- GetExpandedParts(Value, DAG, ShfCom, RotCom);
- BCFInput = DAG.getNode(PIC16ISD::Dummy, MVT::Flag);
- Tys = DAG.getVTList(MVT::i8, MVT::Flag);
-
- for (unsigned i=0;i<ShiftAmt;i++) {
- BCF = DAG.getNode(PIC16ISD::BCF, MVT::Flag, StatusReg, CarryBit, BCFInput);
-
- // Following are Two-Address Instructions
- ShfCom = DAG.getNode(ShfNode, Tys, ShfCom, BCF);
- RotCom = DAG.getNode(RotNode, Tys, RotCom, ShfCom.getValue(1));
+ SmallVector<SDValue, 2> Ops(2);
+ Ops[0] = Value;
+ Ops[1] = Amt;
+ SDValue Call = MakePIC16Libcall(CallCode, N->getValueType(0), &Ops[0], 2,
+ true, DAG, N->getDebugLoc());
+ return Call;
+}
- BCFInput = RotCom.getValue(1);
+void
+PIC16TargetLowering::LowerOperationWrapper(SDNode *N,
+ SmallVectorImpl<SDValue>&Results,
+ SelectionDAG &DAG) {
+ SDValue Op = SDValue(N, 0);
+ SDValue Res;
+ unsigned i;
+ switch (Op.getOpcode()) {
+ case ISD::FORMAL_ARGUMENTS:
+ Res = LowerFORMAL_ARGUMENTS(Op, DAG); break;
+ case ISD::LOAD:
+ Res = ExpandLoad(Op.getNode(), DAG); break;
+ case ISD::CALL:
+ Res = LowerCALL(Op, DAG); break;
+ default: {
+ // All other operations are handled in LowerOperation.
+ Res = LowerOperation(Op, DAG);
+ if (Res.getNode())
+ Results.push_back(Res);
+
+ return;
+ }
}
- return DAG.getNode(ISD::BUILD_PAIR, N->getValueType(0), ShfCom, RotCom);
+ N = Res.getNode();
+ unsigned NumValues = N->getNumValues();
+ for (i = 0; i < NumValues ; i++) {
+ Results.push_back(SDValue(N, i));
+ }
}
SDValue PIC16TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
case ISD::FORMAL_ARGUMENTS:
return LowerFORMAL_ARGUMENTS(Op, DAG);
+ case ISD::ADD:
case ISD::ADDC:
- return LowerADDC(Op, DAG);
case ISD::ADDE:
- return LowerADDE(Op, DAG);
- case ISD::SUBE:
- return LowerSUBE(Op, DAG);
+ return LowerADD(Op, DAG);
+ case ISD::SUB:
case ISD::SUBC:
- return LowerSUBC(Op, DAG);
+ case ISD::SUBE:
+ return LowerSUB(Op, DAG);
case ISD::LOAD:
return ExpandLoad(Op.getNode(), DAG);
case ISD::STORE:
return ExpandStore(Op.getNode(), DAG);
case ISD::SHL:
- return ExpandShift(Op.getNode(), DAG);
+ case ISD::SRA:
+ case ISD::SRL:
+ return LowerShift(Op, DAG);
case ISD::OR:
case ISD::AND:
case ISD::XOR:
return LowerBinOp(Op, DAG);
+ case ISD::CALL:
+ return LowerCALL(Op, DAG);
+ case ISD::RET:
+ return LowerRET(Op, DAG);
+ case ISD::BR_CC:
+ return LowerBR_CC(Op, DAG);
+ case ISD::SELECT_CC:
+ return LowerSELECT_CC(Op, DAG);
}
return SDValue();
}
return Load.getValue(0);
}
+
+SDValue
+PIC16TargetLowering::LowerCallArguments(SDValue Op, SDValue Chain,
+ SDValue FrameAddress,
+ SDValue InFlag,
+ SelectionDAG &DAG) {
+ CallSDNode *TheCall = dyn_cast<CallSDNode>(Op);
+ unsigned NumOps = TheCall->getNumArgs();
+ std::string Name;
+ SDValue Arg, StoreAt;
+ MVT ArgVT;
+ unsigned Size=0;
+ unsigned ArgCount=0;
+
+
+ // FIXME: This portion of code currently assumes only
+ // primitive types being passed as arguments.
+
+ // Legalize the address before use
+ SDValue PtrLo, PtrHi;
+ unsigned AddressOffset;
+ int StoreOffset = 0;
+ LegalizeAddress(FrameAddress, DAG, PtrLo, PtrHi, AddressOffset);
+ SDValue StoreRet;
+
+ std::vector<SDValue> Ops;
+ SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
+ for (unsigned i=ArgCount, Offset = 0; i<NumOps; i++) {
+ // Get the argument
+ Arg = TheCall->getArg(i);
+
+ StoreOffset = (Offset + AddressOffset);
+
+ // Store the argument on frame
+
+ Ops.clear();
+ Ops.push_back(Chain);
+ Ops.push_back(Arg.getValue(0));
+ Ops.push_back(PtrLo);
+ Ops.push_back(PtrHi);
+ Ops.push_back(DAG.getConstant(StoreOffset, MVT::i8));
+ Ops.push_back(InFlag);
+
+ StoreRet = DAG.getNode (PIC16ISD::PIC16StWF, Tys, &Ops[0], Ops.size());
+
+ Chain = getChain(StoreRet);
+ InFlag = getOutFlag(StoreRet);
+
+ // Update the frame offset to be used for next argument
+ ArgVT = Arg.getValueType();
+ Size = ArgVT.getSizeInBits();
+ Size = Size/8; // Calculate size in bytes
+ Offset += Size; // Increase the frame offset
+ }
+ return Chain;
+}
-SDValue PIC16TargetLowering:: LowerBinOp(SDValue Op, SelectionDAG &DAG) {
- // We should have handled larger operands in type legalizer itself.
- assert (Op.getValueType() == MVT::i8 && "illegal Op to lower");
+SDValue
+PIC16TargetLowering::LowerCallReturn(SDValue Op, SDValue Chain,
+ SDValue FrameAddress,
+ SDValue InFlag,
+ SelectionDAG &DAG) {
+ CallSDNode *TheCall = dyn_cast<CallSDNode>(Op);
+ // Currently handling primitive types only. They will come in
+ // i8 parts
+ unsigned RetVals = TheCall->getNumRetVals();
+
+ std::vector<SDValue> ResultVals;
- // Return the original Op if the one of the operands is already a load.
- if (Op.getOperand(0).getOpcode() == PIC16ISD::PIC16Load
- || Op.getOperand(1).getOpcode() == PIC16ISD::PIC16Load)
- return Op;
+ // Return immediately if the return type is void
+ if (RetVals == 0)
+ return Chain;
- // Put one value on stack.
- SDValue NewVal = ConvertToMemOperand (Op.getOperand(1), DAG);
+ // Call has something to return
+
+ // Legalize the address before use
+ SDValue LdLo, LdHi;
+ unsigned LdOffset;
+ LegalizeAddress(FrameAddress, DAG, LdLo, LdHi, LdOffset);
- return DAG.getNode(Op.getOpcode(), MVT::i8, Op.getOperand(0), NewVal);
-}
+ SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
+ SDValue LoadRet;
+
+ for(unsigned i=0, Offset=0;i<RetVals;i++) {
-SDValue PIC16TargetLowering:: LowerADDC(SDValue Op, SelectionDAG &DAG) {
- // We should have handled larger operands in type legalizer itself.
- assert (Op.getValueType() == MVT::i8 && "illegal addc to lower");
+ LoadRet = DAG.getNode(PIC16ISD::PIC16LdWF, Tys, Chain, LdLo, LdHi,
+ DAG.getConstant(LdOffset + Offset, MVT::i8),
+ InFlag);
- // Nothing to do if the one of the operands is already a load.
- if (Op.getOperand(0).getOpcode() == PIC16ISD::PIC16Load
- || Op.getOperand(1).getOpcode() == PIC16ISD::PIC16Load)
- return SDValue();
+ InFlag = getOutFlag(LoadRet);
- // Put one value on stack.
- SDValue NewVal = ConvertToMemOperand (Op.getOperand(1), DAG);
-
- SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
- return DAG.getNode(ISD::ADDC, Tys, Op.getOperand(0), NewVal);
+ Chain = getChain(LoadRet);
+ Offset++;
+ ResultVals.push_back(LoadRet);
+ }
+
+ // To return use MERGE_VALUES
+ ResultVals.push_back(Chain);
+ SDValue Res = DAG.getMergeValues(&ResultVals[0], ResultVals.size());
+ return Res;
}
-SDValue PIC16TargetLowering:: LowerADDE(SDValue Op, SelectionDAG &DAG) {
- // We should have handled larger operands in type legalizer itself.
- assert (Op.getValueType() == MVT::i8 && "illegal adde to lower");
+SDValue PIC16TargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
+ //int NumOps = Op.getNode()->getNumOperands();
- // Nothing to do if the one of the operands is already a load.
- if (Op.getOperand(0).getOpcode() == PIC16ISD::PIC16Load
- || Op.getOperand(1).getOpcode() == PIC16ISD::PIC16Load)
- return SDValue();
+ // For default cases LLVM returns the value on the function frame
+ // So let LLVM do this for all the cases other than character
+ return Op;
+}
+
+SDValue PIC16TargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
+ CallSDNode *TheCall = dyn_cast<CallSDNode>(Op);
+ SDValue Chain = TheCall->getChain();
+ SDValue Callee = TheCall->getCallee();
+ unsigned i =0;
+ if (Callee.getValueType() == MVT::i16 &&
+ Callee.getOpcode() == ISD::BUILD_PAIR) {
+ // It has come from TypeLegalizer for lowering
+
+ Callee = Callee.getOperand(0).getOperand(0);
+
+ std::vector<SDValue> Ops;
+ Ops.push_back(Chain);
+ Ops.push_back(Callee);
+
+ // Add the call arguments and their flags
+ unsigned NumArgs = TheCall->getNumArgs();
+ for(i=0;i<NumArgs;i++) {
+ Ops.push_back(TheCall->getArg(i));
+ Ops.push_back(TheCall->getArgFlagsVal(i));
+ }
+
+ std::vector<MVT> NodeTys;
+ unsigned NumRets = TheCall->getNumRetVals();
+ for(i=0;i<NumRets;i++)
+ NodeTys.push_back(TheCall->getRetValType(i));
+
+ // Return a Chain as well
+ NodeTys.push_back(MVT::Other);
+
+ SDVTList VTs = DAG.getVTList(&NodeTys[0], NodeTys.size());
+ SDValue NewCall =
+ DAG.getCall(TheCall->getCallingConv(), TheCall->getDebugLoc(),
+ TheCall->isVarArg(), TheCall->isTailCall(),
+ TheCall->isInreg(), VTs, &Ops[0], Ops.size());
- // Put one value on stack.
- SDValue NewVal = ConvertToMemOperand (Op.getOperand(1), DAG);
+ return NewCall;
+ }
- SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
- return DAG.getNode(ISD::ADDE, Tys, Op.getOperand(0), NewVal,
- Op.getOperand(2));
+ SDValue ZeroOperand = DAG.getConstant(0, MVT::i8);
+
+ // Start the call sequence.
+ // Carring the Constant 0 along the CALLSEQSTART
+ // because there is nothing else to carry.
+ SDValue SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
+ Chain = getChain(SeqStart);
+
+ // For any direct call - callee will be GlobalAddressNode or
+ // ExternalSymbol
+
+ // Considering the GlobalAddressNode case here.
+ if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
+ GlobalValue *GV = G->getGlobal();
+ Callee = DAG.getTargetGlobalAddress(GV, MVT::i8);
+ }
+
+ // Considering the ExternalSymbol case here
+ if (ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Callee)) {
+ Callee = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
+ }
+
+ SDValue OperFlag = getOutFlag(Chain); // To manage the data dependency
+
+ std::string Name;
+
+ // Considering GlobalAddress here
+ if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
+ Name = G->getGlobal()->getName();
+
+ // Considering ExternalSymbol here
+ if (ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Callee))
+ Name = ES->getSymbol();
+
+ char *argFrame = new char [strlen(Name.c_str()) + 8];
+ sprintf(argFrame, "%s.args", Name.c_str());
+ SDValue ArgLabel = DAG.getTargetExternalSymbol(argFrame, MVT::i8);
+
+ char *retName = new char [strlen(Name.c_str()) + 8];
+ sprintf(retName, "%s.retval", Name.c_str());
+ SDValue RetLabel = DAG.getTargetExternalSymbol(retName, MVT::i8);
+
+ // Pass the argument to function before making the call.
+ SDValue CallArgs = LowerCallArguments(Op, Chain, ArgLabel, OperFlag, DAG);
+ Chain = getChain(CallArgs);
+ OperFlag = getOutFlag(CallArgs);
+
+ SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
+ SDValue PICCall = DAG.getNode(PIC16ISD::CALL, Tys, Chain, Callee,
+ OperFlag);
+ Chain = getChain(PICCall);
+ OperFlag = getOutFlag(PICCall);
+
+
+ // Carrying the Constant 0 along the CALLSEQSTART
+ // because there is nothing else to carry.
+ SDValue SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
+ OperFlag);
+ Chain = getChain(SeqEnd);
+ OperFlag = getOutFlag(SeqEnd);
+
+ // Lower the return value reading after the call.
+ return LowerCallReturn(Op, Chain, RetLabel, OperFlag, DAG);
}
-SDValue PIC16TargetLowering:: LowerSUBC(SDValue Op, SelectionDAG &DAG) {
+bool PIC16TargetLowering::isDirectLoad(const SDValue Op) {
+ if (Op.getOpcode() == PIC16ISD::PIC16Load)
+ if (Op.getOperand(1).getOpcode() == ISD::TargetGlobalAddress
+ || Op.getOperand(1).getOpcode() == ISD::TargetExternalSymbol)
+ return true;
+ return false;
+}
+
+bool PIC16TargetLowering::NeedToConvertToMemOp(SDValue Op, unsigned &MemOp) {
+ // Return false if one of the operands is already a direct
+ // load and that operand has only one use.
+ if (Op.getOperand(0).getOpcode() == ISD::Constant ||
+ Op.getOperand(1).getOpcode() == ISD::Constant)
+ return false;
+ if (isDirectLoad(Op.getOperand(0))) {
+ if (Op.getOperand(0).hasOneUse())
+ return false;
+ else
+ MemOp = 0;
+ }
+ if (isDirectLoad(Op.getOperand(1))) {
+ if (Op.getOperand(1).hasOneUse())
+ return false;
+ else
+ MemOp = 1;
+ }
+ return true;
+}
+
+SDValue PIC16TargetLowering:: LowerBinOp(SDValue Op, SelectionDAG &DAG) {
// We should have handled larger operands in type legalizer itself.
- assert (Op.getValueType() == MVT::i8 && "illegal subc to lower");
+ assert (Op.getValueType() == MVT::i8 && "illegal Op to lower");
+ unsigned MemOp = 1;
+ if (NeedToConvertToMemOp(Op, MemOp)) {
+ // Put one value on stack.
+ SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG);
- // Nothing to do if the first operand is already a load.
- if (Op.getOperand(0).getOpcode() == PIC16ISD::PIC16Load)
- return SDValue();
+ return DAG.getNode(Op.getOpcode(), MVT::i8, Op.getOperand(MemOp ^ 1),
+ NewVal);
+ }
+ else {
+ return Op;
+ }
+}
- // Put first operand on stack.
- SDValue NewVal = ConvertToMemOperand (Op.getOperand(0), DAG);
+SDValue PIC16TargetLowering:: LowerADD(SDValue Op, SelectionDAG &DAG) {
+ // We should have handled larger operands in type legalizer itself.
+ assert (Op.getValueType() == MVT::i8 && "illegal add to lower");
+ unsigned MemOp = 1;
+ if (NeedToConvertToMemOp(Op, MemOp)) {
+ // Put one value on stack.
+ SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG);
+
+ SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
- SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
- return DAG.getNode(ISD::SUBC, Tys, NewVal, Op.getOperand(1));
+ if (Op.getOpcode() == ISD::ADDE)
+ return DAG.getNode(Op.getOpcode(), Tys, Op.getOperand(MemOp ^ 1), NewVal,
+ Op.getOperand(2));
+ else
+ return DAG.getNode(Op.getOpcode(), Tys, Op.getOperand(MemOp ^ 1), NewVal);
+ }
+ else if (Op.getOpcode() == ISD::ADD) {
+ return Op;
+ }
+ else {
+ return SDValue();
+ }
}
-SDValue PIC16TargetLowering:: LowerSUBE(SDValue Op, SelectionDAG &DAG) {
+SDValue PIC16TargetLowering::LowerSUB(SDValue Op, SelectionDAG &DAG) {
// We should have handled larger operands in type legalizer itself.
- assert (Op.getValueType() == MVT::i8 && "illegal sube to lower");
+ assert (Op.getValueType() == MVT::i8 && "illegal sub to lower");
- // Nothing to do if the first operand is already a load.
- if (Op.getOperand(0).getOpcode() == PIC16ISD::PIC16Load)
+ // Nothing to do if the first operand is already a direct load and it has
+ // only one use.
+ if (isDirectLoad(Op.getOperand(0)) && Op.getOperand(0).hasOneUse())
return SDValue();
// Put first operand on stack.
SDValue NewVal = ConvertToMemOperand (Op.getOperand(0), DAG);
SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
- return DAG.getNode(ISD::SUBE, Tys, NewVal, Op.getOperand(1),
- Op.getOperand(2));
+ if (Op.getOpcode() == ISD::SUBE)
+ return DAG.getNode(Op.getOpcode(), Tys, NewVal, Op.getOperand(1),
+ Op.getOperand(2));
+ else
+ return DAG.getNode(Op.getOpcode(), Tys, NewVal, Op.getOperand(1));
}
// LowerFORMAL_ARGUMENTS - In Lowering FORMAL ARGUMENTS - MERGE_VALUES nodes
}
return SDValue();
}
+
+static PIC16CC::CondCodes IntCCToPIC16CC(ISD::CondCode CC) {
+ switch (CC) {
+ default: assert(0 && "Unknown condition code!");
+ case ISD::SETNE: return PIC16CC::NE;
+ case ISD::SETEQ: return PIC16CC::EQ;
+ case ISD::SETGT: return PIC16CC::GT;
+ case ISD::SETGE: return PIC16CC::GE;
+ case ISD::SETLT: return PIC16CC::LT;
+ case ISD::SETLE: return PIC16CC::LE;
+ case ISD::SETULT: return PIC16CC::ULT;
+ case ISD::SETULE: return PIC16CC::LE;
+ case ISD::SETUGE: return PIC16CC::GE;
+ case ISD::SETUGT: return PIC16CC::UGT;
+ }
+}
+
+// Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
+// set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
+static void LookThroughSetCC(SDValue &LHS, SDValue &RHS,
+ ISD::CondCode CC, unsigned &SPCC) {
+ if (isa<ConstantSDNode>(RHS) &&
+ cast<ConstantSDNode>(RHS)->getZExtValue() == 0 &&
+ CC == ISD::SETNE &&
+ (LHS.getOpcode() == PIC16ISD::SELECT_ICC &&
+ LHS.getOperand(3).getOpcode() == PIC16ISD::SUBCC) &&
+ isa<ConstantSDNode>(LHS.getOperand(0)) &&
+ isa<ConstantSDNode>(LHS.getOperand(1)) &&
+ cast<ConstantSDNode>(LHS.getOperand(0))->getZExtValue() == 1 &&
+ cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() == 0) {
+ SDValue CMPCC = LHS.getOperand(3);
+ SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getZExtValue();
+ LHS = CMPCC.getOperand(0);
+ RHS = CMPCC.getOperand(1);
+ }
+}
+
+// Returns appropriate CMP insn and corresponding condition code in PIC16CC
+SDValue PIC16TargetLowering::getPIC16Cmp(SDValue LHS, SDValue RHS,
+ unsigned CC, SDValue &PIC16CC,
+ SelectionDAG &DAG) {
+ PIC16CC::CondCodes CondCode = (PIC16CC::CondCodes) CC;
+
+ // PIC16 sub is literal - W. So Swap the operands and condition if needed.
+ // i.e. a < 12 can be rewritten as 12 > a.
+ if (RHS.getOpcode() == ISD::Constant) {
+
+ SDValue Tmp = LHS;
+ LHS = RHS;
+ RHS = Tmp;
+
+ switch (CondCode) {
+ default: break;
+ case PIC16CC::LT:
+ CondCode = PIC16CC::GT;
+ break;
+ case PIC16CC::GT:
+ CondCode = PIC16CC::LT;
+ break;
+ case PIC16CC::ULT:
+ CondCode = PIC16CC::UGT;
+ break;
+ case PIC16CC::UGT:
+ CondCode = PIC16CC::ULT;
+ break;
+ case PIC16CC::GE:
+ CondCode = PIC16CC::LE;
+ break;
+ case PIC16CC::LE:
+ CondCode = PIC16CC::GE;
+ break;
+ case PIC16CC::ULE:
+ CondCode = PIC16CC::UGE;
+ break;
+ case PIC16CC::UGE:
+ CondCode = PIC16CC::ULE;
+ break;
+ }
+ }
+
+ PIC16CC = DAG.getConstant(CondCode, MVT::i8);
+
+ // These are signed comparisons.
+ SDValue Mask = DAG.getConstant(128, MVT::i8);
+ if (isSignedComparison(CondCode)) {
+ LHS = DAG.getNode (ISD::XOR, MVT::i8, LHS, Mask);
+ RHS = DAG.getNode (ISD::XOR, MVT::i8, RHS, Mask);
+ }
+
+ SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Flag);
+ // We can use a subtract operation to set the condition codes. But
+ // we need to put one operand in memory if required.
+ // Nothing to do if the first operand is already a valid type (direct load
+ // for subwf and literal for sublw) and it is used by this operation only.
+ if ((LHS.getOpcode() == ISD::Constant || isDirectLoad(LHS))
+ && LHS.hasOneUse())
+ return DAG.getNode(PIC16ISD::SUBCC, VTs, LHS, RHS);
+
+ // else convert the first operand to mem.
+ LHS = ConvertToMemOperand (LHS, DAG);
+ return DAG.getNode(PIC16ISD::SUBCC, VTs, LHS, RHS);
+}
+
+
+SDValue PIC16TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
+ SDValue LHS = Op.getOperand(0);
+ SDValue RHS = Op.getOperand(1);
+ ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
+ SDValue TrueVal = Op.getOperand(2);
+ SDValue FalseVal = Op.getOperand(3);
+ unsigned ORIGCC = ~0;
+
+ // If this is a select_cc of a "setcc", and if the setcc got lowered into
+ // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
+ // i.e.
+ // A setcc: lhs, rhs, cc is expanded by llvm to
+ // select_cc: result of setcc, 0, 1, 0, setne
+ // We can think of it as:
+ // select_cc: lhs, rhs, 1, 0, cc
+ LookThroughSetCC(LHS, RHS, CC, ORIGCC);
+ if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
+
+ SDValue PIC16CC;
+ SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG);
+
+ return DAG.getNode (PIC16ISD::SELECT_ICC, TrueVal.getValueType(), TrueVal,
+ FalseVal, PIC16CC, Cmp.getValue(1));
+}
+
+MachineBasicBlock *
+PIC16TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
+ MachineBasicBlock *BB) {
+ const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
+ unsigned CC = (PIC16CC::CondCodes)MI->getOperand(3).getImm();
+
+ // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
+ // control-flow pattern. The incoming instruction knows the destination vreg
+ // to set, the condition code register to branch on, the true/false values to
+ // select between, and a branch opcode to use.
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineFunction::iterator It = BB;
+ ++It;
+
+ // thisMBB:
+ // ...
+ // TrueVal = ...
+ // [f]bCC copy1MBB
+ // fallthrough --> copy0MBB
+ MachineBasicBlock *thisMBB = BB;
+ MachineFunction *F = BB->getParent();
+ MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
+ BuildMI(BB, TII.get(PIC16::pic16brcond)).addMBB(sinkMBB).addImm(CC);
+ F->insert(It, copy0MBB);
+ F->insert(It, sinkMBB);
+
+ // Update machine-CFG edges by transferring all successors of the current
+ // block to the new block which will contain the Phi node for the select.
+ sinkMBB->transferSuccessors(BB);
+ // Next, add the true and fallthrough blocks as its successors.
+ BB->addSuccessor(copy0MBB);
+ BB->addSuccessor(sinkMBB);
+
+ // copy0MBB:
+ // %FalseValue = ...
+ // # fallthrough to sinkMBB
+ BB = copy0MBB;
+
+ // Update machine-CFG edges
+ BB->addSuccessor(sinkMBB);
+
+ // sinkMBB:
+ // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
+ // ...
+ BB = sinkMBB;
+ BuildMI(BB, TII.get(PIC16::PHI), MI->getOperand(0).getReg())
+ .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
+ .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
+
+ F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
+ return BB;
+}
+
+
+SDValue PIC16TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
+ SDValue Chain = Op.getOperand(0);
+ ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
+ SDValue LHS = Op.getOperand(2); // LHS of the condition.
+ SDValue RHS = Op.getOperand(3); // RHS of the condition.
+ SDValue Dest = Op.getOperand(4); // BB to jump to
+ unsigned ORIGCC = ~0;
+
+ // If this is a br_cc of a "setcc", and if the setcc got lowered into
+ // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
+ LookThroughSetCC(LHS, RHS, CC, ORIGCC);
+ if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
+
+ // Get the Compare insn and condition code.
+ SDValue PIC16CC;
+ SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG);
+
+ return DAG.getNode(PIC16ISD::BRCOND, MVT::Other, Chain, Dest, PIC16CC,
+ Cmp.getValue(1));
+}
+
+
projects / oota-llvm.git / blobdiff