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//===-- 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 {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
CONST32,
CONST32_GP, // For marking data present in GP.
CONST32_Int_Real,
FCONST32,
SETCC,
ADJDYNALLOC,
ARGEXTEND,
CMPICC, // Compare two GPR operands, set icc.
CMPFCC, // Compare two FP operands, set fcc.
BRICC, // Branch to dest on icc condition
BRFCC, // Branch to dest on fcc condition
SELECT_ICC, // Select between two values using the current ICC flags.
SELECT_FCC, // Select between two values using the current FCC flags.
Hi, Lo, // Hi/Lo operations, typically on a global address.
FTOI, // FP to Int within a FP register.
ITOF, // Int to FP within a FP register.
CALLv3, // A V3+ call instruction.
CALLv3nr, // A V3+ call instruction that doesn't return.
CALLR,
RET_FLAG, // Return with a flag operand.
BR_JT, // Jump table.
BARRIER, // Memory barrier
POPCOUNT,
COMBINE,
PACKHL,
JT,
CP,
INSERT_ri,
INSERT_rd,
INSERT_riv,
INSERT_rdv,
EXTRACTU_ri,
EXTRACTU_rd,
EXTRACTU_riv,
EXTRACTU_rdv,
WrapperCombineII,
WrapperCombineRR,
WrapperCombineRI_V4,
WrapperCombineIR_V4,
WrapperPackhl,
WrapperSplatB,
WrapperSplatH,
WrapperShuffEB,
WrapperShuffEH,
WrapperShuffOB,
WrapperShuffOH,
TC_RETURN,
EH_RETURN,
DCFETCH
};
}
class HexagonSubtarget;
class HexagonTargetLowering : public TargetLowering {
int VarArgsFrameOffset; // Frame offset to start of varargs area.
bool CanReturnSmallStruct(const Function* CalleeFn,
unsigned& RetSize) const;
public:
const HexagonSubtarget *Subtarget;
explicit HexagonTargetLowering(const TargetMachine &TM,
const HexagonSubtarget &Subtarget);
/// 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;
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
SDValue LowerBR_JT(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 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 LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const;
SDValue LowerRETURNADDR(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;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const override;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
EVT getSetCCResultType(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,
const std::string &Constraint,
MVT VT) const override;
// 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 AddrMode &AM, Type *Ty) 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;
};
} // end namespace llvm
#endif // Hexagon_ISELLOWERING_H
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