4921500d392eb7e8295b6970186f7d48f8f37a1d
[oota-llvm.git] / lib / Target / MSP430 / MSP430ISelLowering.h
1 //==-- MSP430ISelLowering.h - MSP430 DAG Lowering Interface ------*- C++ -*-==//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the interfaces that MSP430 uses to lower LLVM code into a
11 // selection DAG.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #ifndef LLVM_TARGET_MSP430_ISELLOWERING_H
16 #define LLVM_TARGET_MSP430_ISELLOWERING_H
17
18 #include "MSP430.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/Target/TargetLowering.h"
21
22 namespace llvm {
23   namespace MSP430ISD {
24     enum {
25       FIRST_NUMBER = ISD::BUILTIN_OP_END,
26
27       /// Return with a flag operand. Operand 0 is the chain operand.
28       RET_FLAG,
29
30       /// Same as RET_FLAG, but used for returning from ISRs.
31       RETI_FLAG,
32
33       /// Y = R{R,L}A X, rotate right (left) arithmetically
34       RRA, RLA,
35
36       /// Y = RRC X, rotate right via carry
37       RRC,
38
39       /// CALL - These operations represent an abstract call
40       /// instruction, which includes a bunch of information.
41       CALL,
42
43       /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
44       /// and TargetGlobalAddress.
45       Wrapper,
46
47       /// CMP - Compare instruction.
48       CMP,
49
50       /// SetCC - Operand 0 is condition code, and operand 1 is the flag
51       /// operand produced by a CMP instruction.
52       SETCC,
53
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
57       /// instruction.
58       BR_CC,
59
60       /// SELECT_CC - Operand 0 and operand 1 are selection variable, operand 3
61       /// is condition code and operand 4 is flag operand.
62       SELECT_CC,
63
64       /// SHL, SRA, SRL - Non-constant shifts.
65       SHL, SRA, SRL
66     };
67   }
68
69   class MSP430Subtarget;
70   class MSP430TargetMachine;
71
72   class MSP430TargetLowering : public TargetLowering {
73   public:
74     explicit MSP430TargetLowering(MSP430TargetMachine &TM);
75
76     /// LowerOperation - Provide custom lowering hooks for some operations.
77     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
78
79     /// getTargetNodeName - This method returns the name of a target specific
80     /// DAG node.
81     virtual const char *getTargetNodeName(unsigned Opcode) const;
82
83     /// getFunctionAlignment - Return the Log2 alignment of this function.
84     virtual unsigned getFunctionAlignment(const Function *F) const;
85
86     SDValue LowerShifts(SDValue Op, SelectionDAG &DAG);
87     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
88     SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG);
89     SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
90     SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG);
91     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
92     SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG);
93     SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG);
94     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
95     SDValue getReturnAddressFrameIndex(SelectionDAG &DAG);
96
97     TargetLowering::ConstraintType
98     getConstraintType(const std::string &Constraint) const;
99     std::pair<unsigned, const TargetRegisterClass*>
100     getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
101
102     MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
103                                                    MachineBasicBlock *BB,
104                     DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
105     MachineBasicBlock* EmitShiftInstr(MachineInstr *MI,
106                                       MachineBasicBlock *BB,
107                     DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
108
109   private:
110     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
111                            CallingConv::ID CallConv, bool isVarArg,
112                            bool isTailCall,
113                            const SmallVectorImpl<ISD::OutputArg> &Outs,
114                            const SmallVectorImpl<ISD::InputArg> &Ins,
115                            DebugLoc dl, SelectionDAG &DAG,
116                            SmallVectorImpl<SDValue> &InVals);
117
118     SDValue LowerCCCArguments(SDValue Chain,
119                               CallingConv::ID CallConv,
120                               bool isVarArg,
121                               const SmallVectorImpl<ISD::InputArg> &Ins,
122                               DebugLoc dl,
123                               SelectionDAG &DAG,
124                               SmallVectorImpl<SDValue> &InVals);
125
126     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
127                             CallingConv::ID CallConv, bool isVarArg,
128                             const SmallVectorImpl<ISD::InputArg> &Ins,
129                             DebugLoc dl, SelectionDAG &DAG,
130                             SmallVectorImpl<SDValue> &InVals);
131
132     virtual SDValue
133       LowerFormalArguments(SDValue Chain,
134                            CallingConv::ID CallConv, bool isVarArg,
135                            const SmallVectorImpl<ISD::InputArg> &Ins,
136                            DebugLoc dl, SelectionDAG &DAG,
137                            SmallVectorImpl<SDValue> &InVals);
138     virtual SDValue
139       LowerCall(SDValue Chain, SDValue Callee,
140                 CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
141                 const SmallVectorImpl<ISD::OutputArg> &Outs,
142                 const SmallVectorImpl<ISD::InputArg> &Ins,
143                 DebugLoc dl, SelectionDAG &DAG,
144                 SmallVectorImpl<SDValue> &InVals);
145
146     virtual SDValue
147       LowerReturn(SDValue Chain,
148                   CallingConv::ID CallConv, bool isVarArg,
149                   const SmallVectorImpl<ISD::OutputArg> &Outs,
150                   DebugLoc dl, SelectionDAG &DAG);
151
152     virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
153                                             SDValue &Base,
154                                             SDValue &Offset,
155                                             ISD::MemIndexedMode &AM,
156                                             SelectionDAG &DAG) const;
157
158     const MSP430Subtarget &Subtarget;
159     const MSP430TargetMachine &TM;
160     const TargetData *TD;
161   };
162 } // namespace llvm
163
164 #endif // LLVM_TARGET_MSP430_ISELLOWERING_H