1 //===-- MSP430ISelLowering.h - MSP430 DAG Lowering Interface ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that MSP430 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_MSP430_MSP430ISELLOWERING_H
16 #define LLVM_LIB_TARGET_MSP430_MSP430ISELLOWERING_H
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/Target/TargetLowering.h"
24 enum NodeType : unsigned {
25 FIRST_NUMBER = ISD::BUILTIN_OP_END,
27 /// Return with a flag operand. Operand 0 is the chain operand.
30 /// Same as RET_FLAG, but used for returning from ISRs.
33 /// Y = R{R,L}A X, rotate right (left) arithmetically
36 /// Y = RRC X, rotate right via carry
39 /// CALL - These operations represent an abstract call
40 /// instruction, which includes a bunch of information.
43 /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
44 /// and TargetGlobalAddress.
47 /// CMP - Compare instruction.
50 /// SetCC - Operand 0 is condition code, and operand 1 is the flag
51 /// operand produced by a CMP instruction.
54 /// MSP430 conditional branches. Operand 0 is the chain operand, operand 1
55 /// is the block to branch if condition is true, operand 2 is the
56 /// condition code, and operand 3 is the flag operand produced by a CMP
60 /// SELECT_CC - Operand 0 and operand 1 are selection variable, operand 3
61 /// is condition code and operand 4 is flag operand.
64 /// SHL, SRA, SRL - Non-constant shifts.
69 class MSP430Subtarget;
70 class MSP430TargetLowering : public TargetLowering {
72 explicit MSP430TargetLowering(const TargetMachine &TM,
73 const MSP430Subtarget &STI);
75 MVT getScalarShiftAmountTy(EVT LHSTy) const override { return MVT::i8; }
77 /// LowerOperation - Provide custom lowering hooks for some operations.
78 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
80 /// getTargetNodeName - This method returns the name of a target specific
82 const char *getTargetNodeName(unsigned Opcode) const override;
84 SDValue LowerShifts(SDValue Op, SelectionDAG &DAG) const;
85 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
86 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
87 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
88 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
89 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
90 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
91 SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG) const;
92 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
93 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
94 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
95 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
96 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
98 TargetLowering::ConstraintType
99 getConstraintType(const std::string &Constraint) const override;
100 std::pair<unsigned, const TargetRegisterClass *>
101 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
102 const std::string &Constraint,
103 MVT VT) const override;
105 /// isTruncateFree - Return true if it's free to truncate a value of type
106 /// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in
107 /// register R15W to i8 by referencing its sub-register R15B.
108 bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
109 bool isTruncateFree(EVT VT1, EVT VT2) const override;
111 /// isZExtFree - Return true if any actual instruction that defines a value
112 /// of type Ty1 implicit zero-extends the value to Ty2 in the result
113 /// register. This does not necessarily include registers defined in unknown
114 /// ways, such as incoming arguments, or copies from unknown virtual
115 /// registers. Also, if isTruncateFree(Ty2, Ty1) is true, this does not
116 /// necessarily apply to truncate instructions. e.g. on msp430, all
117 /// instructions that define 8-bit values implicit zero-extend the result
119 bool isZExtFree(Type *Ty1, Type *Ty2) const override;
120 bool isZExtFree(EVT VT1, EVT VT2) const override;
121 bool isZExtFree(SDValue Val, EVT VT2) const override;
123 MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
124 MachineBasicBlock *BB) const override;
125 MachineBasicBlock* EmitShiftInstr(MachineInstr *MI,
126 MachineBasicBlock *BB) const;
129 SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
130 CallingConv::ID CallConv, bool isVarArg,
132 const SmallVectorImpl<ISD::OutputArg> &Outs,
133 const SmallVectorImpl<SDValue> &OutVals,
134 const SmallVectorImpl<ISD::InputArg> &Ins,
135 SDLoc dl, SelectionDAG &DAG,
136 SmallVectorImpl<SDValue> &InVals) const;
138 SDValue LowerCCCArguments(SDValue Chain,
139 CallingConv::ID CallConv,
141 const SmallVectorImpl<ISD::InputArg> &Ins,
144 SmallVectorImpl<SDValue> &InVals) const;
146 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
147 CallingConv::ID CallConv, bool isVarArg,
148 const SmallVectorImpl<ISD::InputArg> &Ins,
149 SDLoc dl, SelectionDAG &DAG,
150 SmallVectorImpl<SDValue> &InVals) const;
153 LowerFormalArguments(SDValue Chain,
154 CallingConv::ID CallConv, bool isVarArg,
155 const SmallVectorImpl<ISD::InputArg> &Ins,
156 SDLoc dl, SelectionDAG &DAG,
157 SmallVectorImpl<SDValue> &InVals) const override;
159 LowerCall(TargetLowering::CallLoweringInfo &CLI,
160 SmallVectorImpl<SDValue> &InVals) const override;
162 SDValue LowerReturn(SDValue Chain,
163 CallingConv::ID CallConv, bool isVarArg,
164 const SmallVectorImpl<ISD::OutputArg> &Outs,
165 const SmallVectorImpl<SDValue> &OutVals,
166 SDLoc dl, SelectionDAG &DAG) const override;
168 bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
171 ISD::MemIndexedMode &AM,
172 SelectionDAG &DAG) const override;