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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 Hexagon_ISELLOWERING_H
#define Hexagon_ISELLOWERING_H
#include "Hexagon.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/CallingConv.h"
#include "llvm/CodeGen/CallingConvLower.h"
namespace llvm {
namespace HexagonISD {
enum {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
CONST32,
CONST32_GP, // For marking data present in GP.
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.
CALL, // A call instruction.
RET_FLAG, // Return with a flag operand.
BR_JT, // Jump table.
BARRIER, // Memory barrier.
WrapperJT,
TC_RETURN
};
}
class HexagonTargetLowering : public TargetLowering {
int VarArgsFrameOffset; // Frame offset to start of varargs area.
bool CanReturnSmallStruct(const Function* CalleeFn,
unsigned& RetSize) const;
public:
HexagonTargetMachine &TM;
explicit HexagonTargetLowering(HexagonTargetMachine &targetmachine);
/// 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;
virtual bool isTruncateFree(Type *Ty1, Type *Ty2) const;
virtual bool isTruncateFree(EVT VT1, EVT VT2) const;
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
virtual const char *getTargetNodeName(unsigned Opcode) const;
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 LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerGLOBALADDRESS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool doesNotRet, bool &isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
const SmallVectorImpl<SDValue> &OutVals,
SDValue Callee) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerMEMBARRIER(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,
DebugLoc dl, SelectionDAG &DAG) const;
virtual MachineBasicBlock
*EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
virtual EVT getSetCCResultType(EVT VT) const {
return MVT::i1;
}
virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
SDValue &Base, SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const;
// Intrinsics
virtual 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.
virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const;
/// 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.
virtual bool isLegalICmpImmediate(int64_t Imm) const;
};
} // end namespace llvm
#endif // Hexagon_ISELLOWERING_H
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