XCore target: Lower RETURNADDR
[oota-llvm.git] / lib / Target / XCore / XCoreISelLowering.h
1 //===-- XCoreISelLowering.h - XCore 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 XCore uses to lower LLVM code into a
11 // selection DAG.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #ifndef XCOREISELLOWERING_H
16 #define XCOREISELLOWERING_H
17
18 #include "XCore.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/Target/TargetLowering.h"
21
22 namespace llvm {
23
24   // Forward delcarations
25   class XCoreSubtarget;
26   class XCoreTargetMachine;
27
28   namespace XCoreISD {
29     enum NodeType {
30       // Start the numbering where the builtin ops and target ops leave off.
31       FIRST_NUMBER = ISD::BUILTIN_OP_END,
32
33       // Branch and link (call)
34       BL,
35
36       // pc relative address
37       PCRelativeWrapper,
38
39       // dp relative address
40       DPRelativeWrapper,
41
42       // cp relative address
43       CPRelativeWrapper,
44
45       // Store word to stack
46       STWSP,
47
48       // Corresponds to retsp instruction
49       RETSP,
50
51       // Corresponds to LADD instruction
52       LADD,
53
54       // Corresponds to LSUB instruction
55       LSUB,
56
57       // Corresponds to LMUL instruction
58       LMUL,
59
60       // Corresponds to MACCU instruction
61       MACCU,
62
63       // Corresponds to MACCS instruction
64       MACCS,
65
66       // Corresponds to CRC8 instruction
67       CRC8,
68
69       // Jumptable branch.
70       BR_JT,
71
72       // Jumptable branch using long branches for each entry.
73       BR_JT32,
74
75       // Memory barrier.
76       MEMBARRIER
77     };
78   }
79
80   //===--------------------------------------------------------------------===//
81   // TargetLowering Implementation
82   //===--------------------------------------------------------------------===//
83   class XCoreTargetLowering : public TargetLowering
84   {
85   public:
86
87     explicit XCoreTargetLowering(XCoreTargetMachine &TM);
88
89     using TargetLowering::isZExtFree;
90     virtual bool isZExtFree(SDValue Val, EVT VT2) const;
91
92
93     virtual unsigned getJumpTableEncoding() const;
94     virtual MVT getScalarShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
95
96     /// LowerOperation - Provide custom lowering hooks for some operations.
97     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
98
99     /// ReplaceNodeResults - Replace the results of node with an illegal result
100     /// type with new values built out of custom code.
101     ///
102     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
103                                     SelectionDAG &DAG) const;
104
105     /// getTargetNodeName - This method returns the name of a target specific
106     //  DAG node.
107     virtual const char *getTargetNodeName(unsigned Opcode) const;
108
109     virtual MachineBasicBlock *
110       EmitInstrWithCustomInserter(MachineInstr *MI,
111                                   MachineBasicBlock *MBB) const;
112
113     virtual bool isLegalAddressingMode(const AddrMode &AM,
114                                        Type *Ty) const;
115
116   private:
117     const XCoreTargetMachine &TM;
118     const XCoreSubtarget &Subtarget;
119
120     // Lower Operand helpers
121     SDValue LowerCCCArguments(SDValue Chain,
122                               CallingConv::ID CallConv,
123                               bool isVarArg,
124                               const SmallVectorImpl<ISD::InputArg> &Ins,
125                               SDLoc dl, SelectionDAG &DAG,
126                               SmallVectorImpl<SDValue> &InVals) const;
127     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
128                            CallingConv::ID CallConv, bool isVarArg,
129                            bool isTailCall,
130                            const SmallVectorImpl<ISD::OutputArg> &Outs,
131                            const SmallVectorImpl<SDValue> &OutVals,
132                            const SmallVectorImpl<ISD::InputArg> &Ins,
133                            SDLoc dl, SelectionDAG &DAG,
134                            SmallVectorImpl<SDValue> &InVals) const;
135     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
136                             CallingConv::ID CallConv, bool isVarArg,
137                             const SmallVectorImpl<ISD::InputArg> &Ins,
138                             SDLoc dl, SelectionDAG &DAG,
139                             SmallVectorImpl<SDValue> &InVals) const;
140     SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
141     SDValue getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV,
142                                     SelectionDAG &DAG) const;
143     SDValue lowerLoadWordFromAlignedBasePlusOffset(SDLoc DL, SDValue Chain,
144                                                    SDValue Base, int64_t Offset,
145                                                    SelectionDAG &DAG) const;
146
147     // Lower Operand specifics
148     SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
149     SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
150     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
151     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
152     SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
153     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
154     SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
155     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
156     SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
157     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
158     SDValue LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
159     SDValue LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
160     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
161     SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
162     SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
163     SDValue LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
164     SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
165     SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG &DAG) const;
166
167     // Inline asm support
168     std::pair<unsigned, const TargetRegisterClass*>
169     getRegForInlineAsmConstraint(const std::string &Constraint,
170                                  MVT VT) const;
171
172     // Expand specifics
173     SDValue TryExpandADDWithMul(SDNode *Op, SelectionDAG &DAG) const;
174     SDValue ExpandADDSUB(SDNode *Op, SelectionDAG &DAG) const;
175
176     virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
177
178     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
179                                                 APInt &KnownZero,
180                                                 APInt &KnownOne,
181                                                 const SelectionDAG &DAG,
182                                                 unsigned Depth = 0) const;
183
184     virtual SDValue
185       LowerFormalArguments(SDValue Chain,
186                            CallingConv::ID CallConv,
187                            bool isVarArg,
188                            const SmallVectorImpl<ISD::InputArg> &Ins,
189                            SDLoc dl, SelectionDAG &DAG,
190                            SmallVectorImpl<SDValue> &InVals) const;
191
192     virtual SDValue
193       LowerCall(TargetLowering::CallLoweringInfo &CLI,
194                 SmallVectorImpl<SDValue> &InVals) const;
195
196     virtual SDValue
197       LowerReturn(SDValue Chain,
198                   CallingConv::ID CallConv, bool isVarArg,
199                   const SmallVectorImpl<ISD::OutputArg> &Outs,
200                   const SmallVectorImpl<SDValue> &OutVals,
201                   SDLoc dl, SelectionDAG &DAG) const;
202
203     virtual bool
204       CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
205                      bool isVarArg,
206                      const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
207                      LLVMContext &Context) const;
208   };
209 }
210
211 #endif // XCOREISELLOWERING_H