| //===-- MSP430ISelLowering.cpp - MSP430 DAG Lowering Implementation ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the MSP430TargetLowering class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "msp430-lower" |
| |
| #include "MSP430ISelLowering.h" |
| #include "MSP430.h" |
| #include "MSP430TargetMachine.h" |
| #include "MSP430Subtarget.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Function.h" |
| #include "llvm/Intrinsics.h" |
| #include "llvm/CallingConv.h" |
| #include "llvm/GlobalVariable.h" |
| #include "llvm/GlobalAlias.h" |
| #include "llvm/CodeGen/CallingConvLower.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/PseudoSourceValue.h" |
| #include "llvm/CodeGen/SelectionDAGISel.h" |
| #include "llvm/CodeGen/ValueTypes.h" |
| #include "llvm/Target/TargetLoweringObjectFile.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/ADT/VectorExtras.h" |
| using namespace llvm; |
| |
| MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) : |
| TargetLowering(tm, new TargetLoweringObjectFileELF()), |
| Subtarget(*tm.getSubtargetImpl()), TM(tm) { |
| |
| // Set up the register classes. |
| addRegisterClass(MVT::i8, MSP430::GR8RegisterClass); |
| addRegisterClass(MVT::i16, MSP430::GR16RegisterClass); |
| |
| // Compute derived properties from the register classes |
| computeRegisterProperties(); |
| |
| // Provide all sorts of operation actions |
| |
| // Division is expensive |
| setIntDivIsCheap(false); |
| |
| // Even if we have only 1 bit shift here, we can perform |
| // shifts of the whole bitwidth 1 bit per step. |
| setShiftAmountType(MVT::i8); |
| |
| setStackPointerRegisterToSaveRestore(MSP430::SPW); |
| setBooleanContents(ZeroOrOneBooleanContent); |
| setSchedulingPreference(SchedulingForLatency); |
| |
| setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote); |
| setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); |
| setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote); |
| setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand); |
| setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand); |
| |
| // We don't have any truncstores |
| setTruncStoreAction(MVT::i16, MVT::i8, Expand); |
| |
| setOperationAction(ISD::SRA, MVT::i8, Custom); |
| setOperationAction(ISD::SHL, MVT::i8, Custom); |
| setOperationAction(ISD::SRL, MVT::i8, Custom); |
| setOperationAction(ISD::SRA, MVT::i16, Custom); |
| setOperationAction(ISD::SHL, MVT::i16, Custom); |
| setOperationAction(ISD::SRL, MVT::i16, Custom); |
| setOperationAction(ISD::ROTL, MVT::i8, Expand); |
| setOperationAction(ISD::ROTR, MVT::i8, Expand); |
| setOperationAction(ISD::ROTL, MVT::i16, Expand); |
| setOperationAction(ISD::ROTR, MVT::i16, Expand); |
| setOperationAction(ISD::GlobalAddress, MVT::i16, Custom); |
| setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom); |
| setOperationAction(ISD::BR_JT, MVT::Other, Expand); |
| setOperationAction(ISD::BRIND, MVT::Other, Expand); |
| setOperationAction(ISD::BR_CC, MVT::i8, Custom); |
| setOperationAction(ISD::BR_CC, MVT::i16, Custom); |
| setOperationAction(ISD::BRCOND, MVT::Other, Expand); |
| setOperationAction(ISD::SETCC, MVT::i8, Expand); |
| setOperationAction(ISD::SETCC, MVT::i16, Expand); |
| setOperationAction(ISD::SELECT, MVT::i8, Expand); |
| setOperationAction(ISD::SELECT, MVT::i16, Expand); |
| setOperationAction(ISD::SELECT_CC, MVT::i8, Custom); |
| setOperationAction(ISD::SELECT_CC, MVT::i16, Custom); |
| setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom); |
| |
| setOperationAction(ISD::CTTZ, MVT::i8, Expand); |
| setOperationAction(ISD::CTTZ, MVT::i16, Expand); |
| setOperationAction(ISD::CTLZ, MVT::i8, Expand); |
| setOperationAction(ISD::CTLZ, MVT::i16, Expand); |
| setOperationAction(ISD::CTPOP, MVT::i8, Expand); |
| setOperationAction(ISD::CTPOP, MVT::i16, Expand); |
| |
| setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand); |
| setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand); |
| setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand); |
| setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand); |
| setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand); |
| setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand); |
| |
| setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand); |
| |
| // FIXME: Implement efficiently multiplication by a constant |
| setOperationAction(ISD::MUL, MVT::i16, Expand); |
| setOperationAction(ISD::MULHS, MVT::i16, Expand); |
| setOperationAction(ISD::MULHU, MVT::i16, Expand); |
| setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand); |
| setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand); |
| |
| setOperationAction(ISD::UDIV, MVT::i16, Expand); |
| setOperationAction(ISD::UDIVREM, MVT::i16, Expand); |
| setOperationAction(ISD::UREM, MVT::i16, Expand); |
| setOperationAction(ISD::SDIV, MVT::i16, Expand); |
| setOperationAction(ISD::SDIVREM, MVT::i16, Expand); |
| setOperationAction(ISD::SREM, MVT::i16, Expand); |
| } |
| |
| SDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) { |
| switch (Op.getOpcode()) { |
| case ISD::SHL: // FALLTHROUGH |
| case ISD::SRL: |
| case ISD::SRA: return LowerShifts(Op, DAG); |
| case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); |
| case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG); |
| case ISD::BR_CC: return LowerBR_CC(Op, DAG); |
| case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); |
| case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG); |
| default: |
| llvm_unreachable("unimplemented operand"); |
| return SDValue(); |
| } |
| } |
| |
| /// getFunctionAlignment - Return the Log2 alignment of this function. |
| unsigned MSP430TargetLowering::getFunctionAlignment(const Function *F) const { |
| return F->hasFnAttr(Attribute::OptimizeForSize) ? 1 : 4; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Calling Convention Implementation |
| //===----------------------------------------------------------------------===// |
| |
| #include "MSP430GenCallingConv.inc" |
| |
| SDValue |
| MSP430TargetLowering::LowerFormalArguments(SDValue Chain, |
| unsigned CallConv, |
| bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> |
| &Ins, |
| DebugLoc dl, |
| SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) { |
| |
| switch (CallConv) { |
| default: |
| llvm_unreachable("Unsupported calling convention"); |
| case CallingConv::C: |
| case CallingConv::Fast: |
| return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals); |
| } |
| } |
| |
| SDValue |
| MSP430TargetLowering::LowerCall(SDValue Chain, SDValue Callee, |
| unsigned CallConv, bool isVarArg, |
| bool isTailCall, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) { |
| |
| switch (CallConv) { |
| default: |
| llvm_unreachable("Unsupported calling convention"); |
| case CallingConv::Fast: |
| case CallingConv::C: |
| return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall, |
| Outs, Ins, dl, DAG, InVals); |
| } |
| } |
| |
| /// LowerCCCArguments - transform physical registers into virtual registers and |
| /// generate load operations for arguments places on the stack. |
| // FIXME: struct return stuff |
| // FIXME: varargs |
| SDValue |
| MSP430TargetLowering::LowerCCCArguments(SDValue Chain, |
| unsigned CallConv, |
| bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> |
| &Ins, |
| DebugLoc dl, |
| SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) { |
| MachineFunction &MF = DAG.getMachineFunction(); |
| MachineFrameInfo *MFI = MF.getFrameInfo(); |
| MachineRegisterInfo &RegInfo = MF.getRegInfo(); |
| |
| // Assign locations to all of the incoming arguments. |
| SmallVector<CCValAssign, 16> ArgLocs; |
| CCState CCInfo(CallConv, isVarArg, getTargetMachine(), |
| ArgLocs, *DAG.getContext()); |
| CCInfo.AnalyzeFormalArguments(Ins, CC_MSP430); |
| |
| assert(!isVarArg && "Varargs not supported yet"); |
| |
| for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { |
| CCValAssign &VA = ArgLocs[i]; |
| if (VA.isRegLoc()) { |
| // Arguments passed in registers |
| EVT RegVT = VA.getLocVT(); |
| switch (RegVT.getSimpleVT().SimpleTy) { |
| default: |
| { |
| #ifndef NDEBUG |
| cerr << "LowerFormalArguments Unhandled argument type: " |
| << RegVT.getSimpleVT().SimpleTy << "\n"; |
| #endif |
| llvm_unreachable(0); |
| } |
| case MVT::i16: |
| unsigned VReg = |
| RegInfo.createVirtualRegister(MSP430::GR16RegisterClass); |
| RegInfo.addLiveIn(VA.getLocReg(), VReg); |
| SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT); |
| |
| // If this is an 8-bit value, it is really passed promoted to 16 |
| // bits. Insert an assert[sz]ext to capture this, then truncate to the |
| // right size. |
| if (VA.getLocInfo() == CCValAssign::SExt) |
| ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue, |
| DAG.getValueType(VA.getValVT())); |
| else if (VA.getLocInfo() == CCValAssign::ZExt) |
| ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue, |
| DAG.getValueType(VA.getValVT())); |
| |
| if (VA.getLocInfo() != CCValAssign::Full) |
| ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); |
| |
| InVals.push_back(ArgValue); |
| } |
| } else { |
| // Sanity check |
| assert(VA.isMemLoc()); |
| // Load the argument to a virtual register |
| unsigned ObjSize = VA.getLocVT().getSizeInBits()/8; |
| if (ObjSize > 2) { |
| cerr << "LowerFormalArguments Unhandled argument type: " |
| << VA.getLocVT().getSimpleVT().SimpleTy |
| << "\n"; |
| } |
| // Create the frame index object for this incoming parameter... |
| int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset()); |
| |
| // Create the SelectionDAG nodes corresponding to a load |
| //from this parameter |
| SDValue FIN = DAG.getFrameIndex(FI, MVT::i16); |
| InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN, |
| PseudoSourceValue::getFixedStack(FI), 0)); |
| } |
| } |
| |
| return Chain; |
| } |
| |
| SDValue |
| MSP430TargetLowering::LowerReturn(SDValue Chain, |
| unsigned CallConv, bool isVarArg, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| DebugLoc dl, SelectionDAG &DAG) { |
| |
| // CCValAssign - represent the assignment of the return value to a location |
| SmallVector<CCValAssign, 16> RVLocs; |
| |
| // CCState - Info about the registers and stack slot. |
| CCState CCInfo(CallConv, isVarArg, getTargetMachine(), |
| RVLocs, *DAG.getContext()); |
| |
| // Analize return values. |
| CCInfo.AnalyzeReturn(Outs, RetCC_MSP430); |
| |
| // If this is the first return lowered for this function, add the regs to the |
| // liveout set for the function. |
| if (DAG.getMachineFunction().getRegInfo().liveout_empty()) { |
| for (unsigned i = 0; i != RVLocs.size(); ++i) |
| if (RVLocs[i].isRegLoc()) |
| DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg()); |
| } |
| |
| SDValue Flag; |
| |
| // Copy the result values into the output registers. |
| for (unsigned i = 0; i != RVLocs.size(); ++i) { |
| CCValAssign &VA = RVLocs[i]; |
| assert(VA.isRegLoc() && "Can only return in registers!"); |
| |
| Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), |
| Outs[i].Val, Flag); |
| |
| // Guarantee that all emitted copies are stuck together, |
| // avoiding something bad. |
| Flag = Chain.getValue(1); |
| } |
| |
| if (Flag.getNode()) |
| return DAG.getNode(MSP430ISD::RET_FLAG, dl, MVT::Other, Chain, Flag); |
| |
| // Return Void |
| return DAG.getNode(MSP430ISD::RET_FLAG, dl, MVT::Other, Chain); |
| } |
| |
| /// LowerCCCCallTo - functions arguments are copied from virtual regs to |
| /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted. |
| /// TODO: sret. |
| SDValue |
| MSP430TargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee, |
| unsigned CallConv, bool isVarArg, |
| bool isTailCall, |
| const SmallVectorImpl<ISD::OutputArg> |
| &Outs, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) { |
| // Analyze operands of the call, assigning locations to each operand. |
| SmallVector<CCValAssign, 16> ArgLocs; |
| CCState CCInfo(CallConv, isVarArg, getTargetMachine(), |
| ArgLocs, *DAG.getContext()); |
| |
| CCInfo.AnalyzeCallOperands(Outs, CC_MSP430); |
| |
| // Get a count of how many bytes are to be pushed on the stack. |
| unsigned NumBytes = CCInfo.getNextStackOffset(); |
| |
| Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes, |
| getPointerTy(), true)); |
| |
| SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass; |
| SmallVector<SDValue, 12> MemOpChains; |
| SDValue StackPtr; |
| |
| // Walk the register/memloc assignments, inserting copies/loads. |
| for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { |
| CCValAssign &VA = ArgLocs[i]; |
| |
| SDValue Arg = Outs[i].Val; |
| |
| // Promote the value if needed. |
| switch (VA.getLocInfo()) { |
| default: llvm_unreachable("Unknown loc info!"); |
| case CCValAssign::Full: break; |
| case CCValAssign::SExt: |
| Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); |
| break; |
| case CCValAssign::ZExt: |
| Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); |
| break; |
| case CCValAssign::AExt: |
| Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); |
| break; |
| } |
| |
| // Arguments that can be passed on register must be kept at RegsToPass |
| // vector |
| if (VA.isRegLoc()) { |
| RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); |
| } else { |
| assert(VA.isMemLoc()); |
| |
| if (StackPtr.getNode() == 0) |
| StackPtr = DAG.getCopyFromReg(Chain, dl, MSP430::SPW, getPointerTy()); |
| |
| SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), |
| StackPtr, |
| DAG.getIntPtrConstant(VA.getLocMemOffset())); |
| |
| |
| MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, |
| PseudoSourceValue::getStack(), |
| VA.getLocMemOffset())); |
| } |
| } |
| |
| // Transform all store nodes into one single node because all store nodes are |
| // independent of each other. |
| if (!MemOpChains.empty()) |
| Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, |
| &MemOpChains[0], MemOpChains.size()); |
| |
| // Build a sequence of copy-to-reg nodes chained together with token chain and |
| // flag operands which copy the outgoing args into registers. The InFlag in |
| // necessary since all emited instructions must be stuck together. |
| SDValue InFlag; |
| for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { |
| Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, |
| RegsToPass[i].second, InFlag); |
| InFlag = Chain.getValue(1); |
| } |
| |
| // If the callee is a GlobalAddress node (quite common, every direct call is) |
| // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. |
| // Likewise ExternalSymbol -> TargetExternalSymbol. |
| if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) |
| Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i16); |
| else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee)) |
| Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i16); |
| |
| // Returns a chain & a flag for retval copy to use. |
| SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag); |
| SmallVector<SDValue, 8> Ops; |
| Ops.push_back(Chain); |
| Ops.push_back(Callee); |
| |
| // Add argument registers to the end of the list so that they are |
| // known live into the call. |
| for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) |
| Ops.push_back(DAG.getRegister(RegsToPass[i].first, |
| RegsToPass[i].second.getValueType())); |
| |
| if (InFlag.getNode()) |
| Ops.push_back(InFlag); |
| |
| Chain = DAG.getNode(MSP430ISD::CALL, dl, NodeTys, &Ops[0], Ops.size()); |
| InFlag = Chain.getValue(1); |
| |
| // Create the CALLSEQ_END node. |
| Chain = DAG.getCALLSEQ_END(Chain, |
| DAG.getConstant(NumBytes, getPointerTy(), true), |
| DAG.getConstant(0, getPointerTy(), true), |
| InFlag); |
| InFlag = Chain.getValue(1); |
| |
| // Handle result values, copying them out of physregs into vregs that we |
| // return. |
| return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, |
| DAG, InVals); |
| } |
| |
| /// LowerCallResult - Lower the result values of a call into the |
| /// appropriate copies out of appropriate physical registers. |
| /// |
| SDValue |
| MSP430TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag, |
| unsigned CallConv, bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) { |
| |
| // Assign locations to each value returned by this call. |
| SmallVector<CCValAssign, 16> RVLocs; |
| CCState CCInfo(CallConv, isVarArg, getTargetMachine(), |
| RVLocs, *DAG.getContext()); |
| |
| CCInfo.AnalyzeCallResult(Ins, RetCC_MSP430); |
| |
| // Copy all of the result registers out of their specified physreg. |
| for (unsigned i = 0; i != RVLocs.size(); ++i) { |
| Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(), |
| RVLocs[i].getValVT(), InFlag).getValue(1); |
| InFlag = Chain.getValue(2); |
| InVals.push_back(Chain.getValue(0)); |
| } |
| |
| return Chain; |
| } |
| |
| SDValue MSP430TargetLowering::LowerShifts(SDValue Op, |
| SelectionDAG &DAG) { |
| unsigned Opc = Op.getOpcode(); |
| SDNode* N = Op.getNode(); |
| EVT VT = Op.getValueType(); |
| DebugLoc dl = N->getDebugLoc(); |
| |
| // We currently only lower shifts of constant argument. |
| if (!isa<ConstantSDNode>(N->getOperand(1))) |
| return SDValue(); |
| |
| uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue(); |
| |
| // Expand the stuff into sequence of shifts. |
| // FIXME: for some shift amounts this might be done better! |
| // E.g.: foo >> (8 + N) => sxt(swpb(foo)) >> N |
| SDValue Victim = N->getOperand(0); |
| |
| if (Opc == ISD::SRL && ShiftAmount) { |
| // Emit a special goodness here: |
| // srl A, 1 => clrc; rrc A |
| Victim = DAG.getNode(MSP430ISD::RRC, dl, VT, Victim); |
| ShiftAmount -= 1; |
| } |
| |
| while (ShiftAmount--) |
| Victim = DAG.getNode((Opc == ISD::SHL ? MSP430ISD::RLA : MSP430ISD::RRA), |
| dl, VT, Victim); |
| |
| return Victim; |
| } |
| |
| SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) { |
| const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); |
| int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset(); |
| |
| // Create the TargetGlobalAddress node, folding in the constant offset. |
| SDValue Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset); |
| return DAG.getNode(MSP430ISD::Wrapper, Op.getDebugLoc(), |
| getPointerTy(), Result); |
| } |
| |
| SDValue MSP430TargetLowering::LowerExternalSymbol(SDValue Op, |
| SelectionDAG &DAG) { |
| DebugLoc dl = Op.getDebugLoc(); |
| const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol(); |
| SDValue Result = DAG.getTargetExternalSymbol(Sym, getPointerTy()); |
| |
| return DAG.getNode(MSP430ISD::Wrapper, dl, getPointerTy(), Result);; |
| } |
| |
| static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, unsigned &TargetCC, |
| ISD::CondCode CC, |
| DebugLoc dl, SelectionDAG &DAG) { |
| // FIXME: Handle bittests someday |
| assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet"); |
| |
| // FIXME: Handle jump negative someday |
| TargetCC = MSP430::COND_INVALID; |
| switch (CC) { |
| default: llvm_unreachable("Invalid integer condition!"); |
| case ISD::SETEQ: |
| TargetCC = MSP430::COND_E; // aka COND_Z |
| break; |
| case ISD::SETNE: |
| TargetCC = MSP430::COND_NE; // aka COND_NZ |
| break; |
| case ISD::SETULE: |
| std::swap(LHS, RHS); // FALLTHROUGH |
| case ISD::SETUGE: |
| TargetCC = MSP430::COND_HS; // aka COND_C |
| break; |
| case ISD::SETUGT: |
| std::swap(LHS, RHS); // FALLTHROUGH |
| case ISD::SETULT: |
| TargetCC = MSP430::COND_LO; // aka COND_NC |
| break; |
| case ISD::SETLE: |
| std::swap(LHS, RHS); // FALLTHROUGH |
| case ISD::SETGE: |
| TargetCC = MSP430::COND_GE; |
| break; |
| case ISD::SETGT: |
| std::swap(LHS, RHS); // FALLTHROUGH |
| case ISD::SETLT: |
| TargetCC = MSP430::COND_L; |
| break; |
| } |
| |
| return DAG.getNode(MSP430ISD::CMP, dl, MVT::Flag, LHS, RHS); |
| } |
| |
| |
| SDValue MSP430TargetLowering::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); |
| SDValue RHS = Op.getOperand(3); |
| SDValue Dest = Op.getOperand(4); |
| DebugLoc dl = Op.getDebugLoc(); |
| |
| unsigned TargetCC = MSP430::COND_INVALID; |
| SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG); |
| |
| return DAG.getNode(MSP430ISD::BR_CC, dl, Op.getValueType(), |
| Chain, |
| Dest, DAG.getConstant(TargetCC, MVT::i8), |
| Flag); |
| } |
| |
| SDValue MSP430TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) { |
| SDValue LHS = Op.getOperand(0); |
| SDValue RHS = Op.getOperand(1); |
| SDValue TrueV = Op.getOperand(2); |
| SDValue FalseV = Op.getOperand(3); |
| ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); |
| DebugLoc dl = Op.getDebugLoc(); |
| |
| unsigned TargetCC = MSP430::COND_INVALID; |
| SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG); |
| |
| SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag); |
| SmallVector<SDValue, 4> Ops; |
| Ops.push_back(TrueV); |
| Ops.push_back(FalseV); |
| Ops.push_back(DAG.getConstant(TargetCC, MVT::i8)); |
| Ops.push_back(Flag); |
| |
| return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, &Ops[0], Ops.size()); |
| } |
| |
| SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op, |
| SelectionDAG &DAG) { |
| SDValue Val = Op.getOperand(0); |
| EVT VT = Op.getValueType(); |
| DebugLoc dl = Op.getDebugLoc(); |
| |
| assert(VT == MVT::i16 && "Only support i16 for now!"); |
| |
| return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT, |
| DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val), |
| DAG.getValueType(Val.getValueType())); |
| } |
| |
| const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const { |
| switch (Opcode) { |
| default: return NULL; |
| case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG"; |
| case MSP430ISD::RRA: return "MSP430ISD::RRA"; |
| case MSP430ISD::RLA: return "MSP430ISD::RLA"; |
| case MSP430ISD::RRC: return "MSP430ISD::RRC"; |
| case MSP430ISD::CALL: return "MSP430ISD::CALL"; |
| case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper"; |
| case MSP430ISD::BR_CC: return "MSP430ISD::BR_CC"; |
| case MSP430ISD::CMP: return "MSP430ISD::CMP"; |
| case MSP430ISD::SELECT_CC: return "MSP430ISD::SELECT_CC"; |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Other Lowering Code |
| //===----------------------------------------------------------------------===// |
| |
| MachineBasicBlock* |
| MSP430TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, |
| MachineBasicBlock *BB) const { |
| const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); |
| DebugLoc dl = MI->getDebugLoc(); |
| assert((MI->getOpcode() == MSP430::Select16 || |
| MI->getOpcode() == MSP430::Select8) && |
| "Unexpected instr type to insert"); |
| |
| // To "insert" a SELECT 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 I = BB; |
| ++I; |
| |
| // thisMBB: |
| // ... |
| // TrueVal = ... |
| // cmpTY ccX, r1, r2 |
| // jCC copy1MBB |
| // fallthrough --> copy0MBB |
| MachineBasicBlock *thisMBB = BB; |
| MachineFunction *F = BB->getParent(); |
| MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); |
| MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB); |
| BuildMI(BB, dl, TII.get(MSP430::JCC)) |
| .addMBB(copy1MBB) |
| .addImm(MI->getOperand(3).getImm()); |
| F->insert(I, copy0MBB); |
| F->insert(I, copy1MBB); |
| // 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. |
| copy1MBB->transferSuccessors(BB); |
| // Next, add the true and fallthrough blocks as its successors. |
| BB->addSuccessor(copy0MBB); |
| BB->addSuccessor(copy1MBB); |
| |
| // copy0MBB: |
| // %FalseValue = ... |
| // # fallthrough to copy1MBB |
| BB = copy0MBB; |
| |
| // Update machine-CFG edges |
| BB->addSuccessor(copy1MBB); |
| |
| // copy1MBB: |
| // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] |
| // ... |
| BB = copy1MBB; |
| BuildMI(BB, dl, TII.get(MSP430::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; |
| } |
