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//===-- MSP430ISelLowering.h - MSP430 DAG Lowering Interface ----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that MSP430 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_MSP430_MSP430ISELLOWERING_H
#define LLVM_LIB_TARGET_MSP430_MSP430ISELLOWERING_H
#include "MSP430.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
class MSP430Subtarget;
class MSP430TargetLowering : public TargetLowering {
public:
explicit MSP430TargetLowering(const TargetMachine &TM,
const MSP430Subtarget &STI);
MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override {
return MVT::i8;
}
MVT::SimpleValueType getCmpLibcallReturnType() const override {
return MVT::i16;
}
/// LowerOperation - Provide custom lowering hooks for some operations.
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
SDValue LowerShifts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
TargetLowering::ConstraintType
getConstraintType(StringRef Constraint) const override;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
/// isTruncateFree - Return true if it's free to truncate a value of type
/// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in
/// register R15W to i8 by referencing its sub-register R15B.
bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
bool isTruncateFree(EVT VT1, EVT VT2) const override;
/// isZExtFree - Return true if any actual instruction that defines a value
/// of type Ty1 implicit zero-extends the value to Ty2 in the result
/// register. This does not necessarily include registers defined in unknown
/// ways, such as incoming arguments, or copies from unknown virtual
/// registers. Also, if isTruncateFree(Ty2, Ty1) is true, this does not
/// necessarily apply to truncate instructions. e.g. on msp430, all
/// instructions that define 8-bit values implicit zero-extend the result
/// out to 16 bits.
bool isZExtFree(Type *Ty1, Type *Ty2) const override;
bool isZExtFree(EVT VT1, EVT VT2) const override;
bool isLegalICmpImmediate(int64_t) const override;
bool shouldAvoidTransformToShift(EVT VT, unsigned Amount) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const override;
MachineBasicBlock *EmitShiftInstr(MachineInstr &MI,
MachineBasicBlock *BB) const;
private:
SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCCCArguments(SDValue Chain, CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCallResult(SDValue Chain, SDValue InGlue,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue
LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue
LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
bool CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context, const Type *RetTy) const override;
SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SDLoc &dl, SelectionDAG &DAG) const override;
bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
SDValue &Base,
SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
};
} // namespace llvm
#endif
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