//===-- MSP430ISelLowering.h - MSP430 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 MSP430 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_MSP430_ISELLOWERING_H
#define LLVM_TARGET_MSP430_ISELLOWERING_H
#include "MSP430.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
namespace llvm {
namespace MSP430ISD {
enum {
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,
/// 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,
/// SHL, SRA, SRL - Non-constant shifts.
SHL, SRA, SRL
};
}
class MSP430TargetLowering : public TargetLowering {
public:
explicit MSP430TargetLowering(const TargetMachine &TM);
MVT getScalarShiftAmountTy(EVT LHSTy) 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(const std::string &Constraint) const override;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &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,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCCCArguments(SDValue Chain,
CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl,
SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) 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
LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
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 getPostIndexedAddressParts(SDNode *N, SDNode *Op,
SDValue &Base,
SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
};
} // namespace llvm
#endif // LLVM_TARGET_MSP430_ISELLOWERING_H