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(const DataLayout &, EVT) const override {
79 /// LowerOperation - Provide custom lowering hooks for some operations.
80 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
82 /// getTargetNodeName - This method returns the name of a target specific
84 const char *getTargetNodeName(unsigned Opcode) const override;
86 SDValue LowerShifts(SDValue Op, SelectionDAG &DAG) const;
87 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
88 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
89 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
90 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
91 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
92 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
93 SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG) const;
94 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
95 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
96 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
97 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
98 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
100 TargetLowering::ConstraintType
101 getConstraintType(StringRef Constraint) const override;
102 std::pair<unsigned, const TargetRegisterClass *>
103 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
104 StringRef Constraint, MVT VT) const override;
106 /// isTruncateFree - Return true if it's free to truncate a value of type
107 /// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in
108 /// register R15W to i8 by referencing its sub-register R15B.
109 bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
110 bool isTruncateFree(EVT VT1, EVT VT2) const override;
112 /// isZExtFree - Return true if any actual instruction that defines a value
113 /// of type Ty1 implicit zero-extends the value to Ty2 in the result
114 /// register. This does not necessarily include registers defined in unknown
115 /// ways, such as incoming arguments, or copies from unknown virtual
116 /// registers. Also, if isTruncateFree(Ty2, Ty1) is true, this does not
117 /// necessarily apply to truncate instructions. e.g. on msp430, all
118 /// instructions that define 8-bit values implicit zero-extend the result
120 bool isZExtFree(Type *Ty1, Type *Ty2) const override;
121 bool isZExtFree(EVT VT1, EVT VT2) const override;
122 bool isZExtFree(SDValue Val, EVT VT2) const override;
124 MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
125 MachineBasicBlock *BB) const override;
126 MachineBasicBlock* EmitShiftInstr(MachineInstr *MI,
127 MachineBasicBlock *BB) const;
130 SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
131 CallingConv::ID CallConv, bool isVarArg,
133 const SmallVectorImpl<ISD::OutputArg> &Outs,
134 const SmallVectorImpl<SDValue> &OutVals,
135 const SmallVectorImpl<ISD::InputArg> &Ins,
136 SDLoc dl, SelectionDAG &DAG,
137 SmallVectorImpl<SDValue> &InVals) const;
139 SDValue LowerCCCArguments(SDValue Chain,
140 CallingConv::ID CallConv,
142 const SmallVectorImpl<ISD::InputArg> &Ins,
145 SmallVectorImpl<SDValue> &InVals) const;
147 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
148 CallingConv::ID CallConv, bool isVarArg,
149 const SmallVectorImpl<ISD::InputArg> &Ins,
150 SDLoc dl, SelectionDAG &DAG,
151 SmallVectorImpl<SDValue> &InVals) const;
154 LowerFormalArguments(SDValue Chain,
155 CallingConv::ID CallConv, bool isVarArg,
156 const SmallVectorImpl<ISD::InputArg> &Ins,
157 SDLoc dl, SelectionDAG &DAG,
158 SmallVectorImpl<SDValue> &InVals) const override;
160 LowerCall(TargetLowering::CallLoweringInfo &CLI,
161 SmallVectorImpl<SDValue> &InVals) const override;
163 SDValue LowerReturn(SDValue Chain,
164 CallingConv::ID CallConv, bool isVarArg,
165 const SmallVectorImpl<ISD::OutputArg> &Outs,
166 const SmallVectorImpl<SDValue> &OutVals,
167 SDLoc dl, SelectionDAG &DAG) const override;
169 bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
172 ISD::MemIndexedMode &AM,
173 SelectionDAG &DAG) const override;