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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 {
namespace MSP430ISD {
enum NodeType : unsigned {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
/// Return with a flag operand. Operand 0 is the chain operand.
RET_FLAG,
/// Same as RET_FLAG, but used for returning from ISRs.
RETI_FLAG,
/// Y = R{R,L}A X, rotate right (left) arithmetically
RRA, RLA,
/// Y = RRC X, rotate right via carry
RRC,
/// Rotate right via carry, carry gets cleared beforehand by clrc
RRCL,
/// CALL - These operations represent an abstract call
/// instruction, which includes a bunch of information.
CALL,
/// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
/// and TargetGlobalAddress.
Wrapper,
/// CMP - Compare instruction.
CMP,
/// SetCC - Operand 0 is condition code, and operand 1 is the flag
/// operand produced by a CMP instruction.
SETCC,
/// MSP430 conditional branches. Operand 0 is the chain operand, operand 1
/// is the block to branch if condition is true, operand 2 is the
/// condition code, and operand 3 is the flag operand produced by a CMP
/// instruction.
BR_CC,
/// SELECT_CC - Operand 0 and operand 1 are selection variable, operand 3
/// is condition code and operand 4 is flag operand.
SELECT_CC,
/// DADD - Decimal addition with carry
/// TODO Nothing generates a node of this type yet.
DADD,
};
}
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;
}
/// LowerOperation - Provide custom lowering hooks for some operations.
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
/// getTargetNodeName - This method returns the name of a target specific
/// DAG node.
const char *getTargetNodeName(unsigned Opcode) 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 isZExtFree(SDValue Val, EVT VT2) 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 InFlag,
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 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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