| //===-- HexagonISelLowering.h - Hexagon DAG Lowering Interface --*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the interfaces that Hexagon uses to lower LLVM code into a |
| // selection DAG. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONISELLOWERING_H |
| #define LLVM_LIB_TARGET_HEXAGON_HEXAGONISELLOWERING_H |
| |
| #include "Hexagon.h" |
| #include "llvm/CodeGen/CallingConvLower.h" |
| #include "llvm/IR/CallingConv.h" |
| #include "llvm/Target/TargetLowering.h" |
| |
| namespace llvm { |
| |
| // Return true when the given node fits in a positive half word. |
| bool isPositiveHalfWord(SDNode *N); |
| |
| namespace HexagonISD { |
| enum NodeType : unsigned { |
| OP_BEGIN = ISD::BUILTIN_OP_END, |
| |
| CONST32 = OP_BEGIN, |
| CONST32_GP, // For marking data present in GP. |
| FCONST32, |
| ALLOCA, |
| ARGEXTEND, |
| |
| AT_GOT, // Index in GOT. |
| AT_PCREL, // Offset relative to PC. |
| |
| CALLv3, // A V3+ call instruction. |
| CALLv3nr, // A V3+ call instruction that doesn't return. |
| CALLR, |
| |
| RET_FLAG, // Return with a flag operand. |
| BARRIER, // Memory barrier. |
| JT, // Jump table. |
| CP, // Constant pool. |
| |
| POPCOUNT, |
| COMBINE, |
| PACKHL, |
| VSPLATB, |
| VSPLATH, |
| SHUFFEB, |
| SHUFFEH, |
| SHUFFOB, |
| SHUFFOH, |
| VSXTBH, |
| VSXTBW, |
| VSRAW, |
| VSRAH, |
| VSRLW, |
| VSRLH, |
| VSHLW, |
| VSHLH, |
| VCMPBEQ, |
| VCMPBGT, |
| VCMPBGTU, |
| VCMPHEQ, |
| VCMPHGT, |
| VCMPHGTU, |
| VCMPWEQ, |
| VCMPWGT, |
| VCMPWGTU, |
| |
| INSERT, |
| INSERTRP, |
| EXTRACTU, |
| EXTRACTURP, |
| VCOMBINE, |
| TC_RETURN, |
| EH_RETURN, |
| DCFETCH, |
| |
| OP_END |
| }; |
| } |
| |
| class HexagonSubtarget; |
| |
| class HexagonTargetLowering : public TargetLowering { |
| int VarArgsFrameOffset; // Frame offset to start of varargs area. |
| |
| bool CanReturnSmallStruct(const Function* CalleeFn, unsigned& RetSize) |
| const; |
| void promoteLdStType(EVT VT, EVT PromotedLdStVT); |
| const HexagonTargetMachine &HTM; |
| const HexagonSubtarget &Subtarget; |
| |
| public: |
| explicit HexagonTargetLowering(const TargetMachine &TM, |
| const HexagonSubtarget &ST); |
| |
| /// IsEligibleForTailCallOptimization - Check whether the call is eligible |
| /// for tail call optimization. Targets which want to do tail call |
| /// optimization should implement this function. |
| bool IsEligibleForTailCallOptimization(SDValue Callee, |
| CallingConv::ID CalleeCC, bool isVarArg, bool isCalleeStructRet, |
| bool isCallerStructRet, const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<SDValue> &OutVals, |
| const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG& DAG) const; |
| |
| bool isTruncateFree(Type *Ty1, Type *Ty2) const override; |
| bool isTruncateFree(EVT VT1, EVT VT2) const override; |
| |
| bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override; |
| |
| // Should we expand the build vector with shuffles? |
| bool shouldExpandBuildVectorWithShuffles(EVT VT, |
| unsigned DefinedValues) const override; |
| |
| SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; |
| const char *getTargetNodeName(unsigned Opcode) const override; |
| SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerEXTRACT_VECTOR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerINSERT_VECTOR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerINLINEASM(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerEH_LABEL(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, |
| bool isVarArg, const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc dl, |
| SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const override; |
| SDValue LowerGLOBALADDRESS(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG) const; |
| |
| SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI, |
| SmallVectorImpl<SDValue> &InVals) const override; |
| SDValue LowerCallResult(SDValue Chain, SDValue InFlag, |
| CallingConv::ID CallConv, bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc dl, |
| SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals, |
| const SmallVectorImpl<SDValue> &OutVals, SDValue Callee) const; |
| |
| SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerVSELECT(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerCTPOP(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const; |
| SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const; |
| |
| SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, |
| bool isVarArg, const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<SDValue> &OutVals, SDLoc dl, |
| SelectionDAG &DAG) const override; |
| |
| bool mayBeEmittedAsTailCall(CallInst *CI) const override; |
| MachineBasicBlock * EmitInstrWithCustomInserter(MachineInstr *MI, |
| MachineBasicBlock *BB) const override; |
| |
| /// If a physical register, this returns the register that receives the |
| /// exception address on entry to an EH pad. |
| unsigned |
| getExceptionPointerRegister(const Constant *PersonalityFn) const override { |
| return Hexagon::R0; |
| } |
| |
| /// If a physical register, this returns the register that receives the |
| /// exception typeid on entry to a landing pad. |
| unsigned |
| getExceptionSelectorRegister(const Constant *PersonalityFn) const override { |
| return Hexagon::R1; |
| } |
| |
| SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const; |
| SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const; |
| EVT getSetCCResultType(const DataLayout &, LLVMContext &C, |
| EVT VT) const override { |
| if (!VT.isVector()) |
| return MVT::i1; |
| else |
| return EVT::getVectorVT(C, MVT::i1, VT.getVectorNumElements()); |
| } |
| |
| bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, |
| SDValue &Base, SDValue &Offset, |
| ISD::MemIndexedMode &AM, |
| SelectionDAG &DAG) const override; |
| |
| std::pair<unsigned, const TargetRegisterClass *> |
| getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI, |
| StringRef Constraint, MVT VT) const override; |
| |
| unsigned |
| getInlineAsmMemConstraint(StringRef ConstraintCode) const override { |
| if (ConstraintCode == "o") |
| return InlineAsm::Constraint_o; |
| else if (ConstraintCode == "v") |
| return InlineAsm::Constraint_v; |
| return TargetLowering::getInlineAsmMemConstraint(ConstraintCode); |
| } |
| |
| // Intrinsics |
| SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const; |
| /// isLegalAddressingMode - Return true if the addressing mode represented |
| /// by AM is legal for this target, for a load/store of the specified type. |
| /// The type may be VoidTy, in which case only return true if the addressing |
| /// mode is legal for a load/store of any legal type. |
| /// TODO: Handle pre/postinc as well. |
| bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, |
| Type *Ty, unsigned AS) const override; |
| /// Return true if folding a constant offset with the given GlobalAddress |
| /// is legal. It is frequently not legal in PIC relocation models. |
| bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override; |
| |
| bool isFPImmLegal(const APFloat &Imm, EVT VT) const override; |
| |
| /// isLegalICmpImmediate - Return true if the specified immediate is legal |
| /// icmp immediate, that is the target has icmp instructions which can |
| /// compare a register against the immediate without having to materialize |
| /// the immediate into a register. |
| bool isLegalICmpImmediate(int64_t Imm) const override; |
| |
| /// Returns relocation base for the given PIC jumptable. |
| SDValue getPICJumpTableRelocBase(SDValue Table, SelectionDAG &DAG) |
| const override; |
| |
| // Handling of atomic RMW instructions. |
| Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr, |
| AtomicOrdering Ord) const override; |
| Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val, |
| Value *Addr, AtomicOrdering Ord) const override; |
| AtomicExpansionKind shouldExpandAtomicLoadInIR(LoadInst *LI) const override; |
| bool shouldExpandAtomicStoreInIR(StoreInst *SI) const override; |
| AtomicExpansionKind |
| shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override { |
| return AtomicExpansionKind::LLSC; |
| } |
| |
| protected: |
| std::pair<const TargetRegisterClass*, uint8_t> |
| findRepresentativeClass(const TargetRegisterInfo *TRI, MVT VT) |
| const override; |
| }; |
| } // end namespace llvm |
| |
| #endif // Hexagon_ISELLOWERING_H |
