1 //===-- PIC16ISelLowering.h - PIC16 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 PIC16 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef PIC16ISELLOWERING_H
16 #define PIC16ISELLOWERING_H
19 #include "PIC16Subtarget.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/Target/TargetLowering.h"
27 // Start the numbering from where ISD NodeType finishes.
28 FIRST_NUMBER = ISD::BUILTIN_OP_END,
30 Lo, // Low 8-bits of GlobalAddress.
31 Hi, // High 8-bits of GlobalAddress.
33 PIC16LdArg, // This is replica of PIC16Load but used to load function
34 // arguments and is being used for facilitating for some
35 // store removal optimizations.
41 MTLO, // Move to low part of FSR
42 MTHI, // Move to high part of FSR
43 MTPCLATH, // Move to PCLATCH
44 PIC16Connect, // General connector for PIC16 nodes
46 LSLF, // PIC16 Logical shift left
47 LRLF, // PIC16 Logical shift right
48 RLF, // Rotate left through carry
49 RRF, // Rotate right through carry
50 CALL, // PIC16 Call instruction
51 CALLW, // PIC16 CALLW instruction
52 SUBCC, // Compare for equality or inequality.
53 SELECT_ICC, // Psuedo to be caught in schedular and expanded to brcond.
54 BRCOND, // Conditional branch.
59 // Keep track of different address spaces.
61 RAM_SPACE = 0, // RAM address space
62 ROM_SPACE = 1 // ROM address space number is 1
65 MUL_I8 = RTLIB::UNKNOWN_LIBCALL + 1,
74 //===--------------------------------------------------------------------===//
75 // TargetLowering Implementation
76 //===--------------------------------------------------------------------===//
77 class PIC16TargetLowering : public TargetLowering {
79 explicit PIC16TargetLowering(PIC16TargetMachine &TM);
81 /// getTargetNodeName - This method returns the name of a target specific
83 virtual const char *getTargetNodeName(unsigned Opcode) const;
84 /// getSetCCResultType - Return the ISD::SETCC ValueType
85 virtual MVT::SimpleValueType getSetCCResultType(EVT ValType) const;
86 virtual MVT::SimpleValueType getCmpLibcallReturnType() const;
87 SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
88 SDValue LowerMUL(SDValue Op, SelectionDAG &DAG) const;
89 SDValue LowerADD(SDValue Op, SelectionDAG &DAG) const;
90 SDValue LowerSUB(SDValue Op, SelectionDAG &DAG) const;
91 SDValue LowerBinOp(SDValue Op, SelectionDAG &DAG) const;
94 LowerDirectCallReturn(SDValue RetLabel, SDValue Chain, SDValue InFlag,
95 const SmallVectorImpl<ISD::InputArg> &Ins,
96 DebugLoc dl, SelectionDAG &DAG,
97 SmallVectorImpl<SDValue> &InVals) const;
99 LowerIndirectCallReturn(SDValue Chain, SDValue InFlag,
100 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
101 const SmallVectorImpl<ISD::InputArg> &Ins,
102 DebugLoc dl, SelectionDAG &DAG,
103 SmallVectorImpl<SDValue> &InVals) const;
107 LowerDirectCallArguments(SDValue ArgLabel, SDValue Chain, SDValue InFlag,
108 const SmallVectorImpl<ISD::OutputArg> &Outs,
109 const SmallVectorImpl<SDValue> &OutVals,
110 DebugLoc dl, SelectionDAG &DAG) const;
113 LowerIndirectCallArguments(SDValue Chain, SDValue InFlag,
114 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
115 const SmallVectorImpl<ISD::OutputArg> &Outs,
116 const SmallVectorImpl<SDValue> &OutVals,
117 const SmallVectorImpl<ISD::InputArg> &Ins,
118 DebugLoc dl, SelectionDAG &DAG) const;
120 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
121 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
122 SDValue getPIC16Cmp(SDValue LHS, SDValue RHS, unsigned OrigCC, SDValue &CC,
123 SelectionDAG &DAG, DebugLoc dl) const;
124 virtual MachineBasicBlock *
125 EmitInstrWithCustomInserter(MachineInstr *MI,
126 MachineBasicBlock *MBB) const;
128 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
129 virtual void ReplaceNodeResults(SDNode *N,
130 SmallVectorImpl<SDValue> &Results,
131 SelectionDAG &DAG) const;
132 virtual void LowerOperationWrapper(SDNode *N,
133 SmallVectorImpl<SDValue> &Results,
134 SelectionDAG &DAG) const;
137 LowerFormalArguments(SDValue Chain,
138 CallingConv::ID CallConv,
140 const SmallVectorImpl<ISD::InputArg> &Ins,
141 DebugLoc dl, SelectionDAG &DAG,
142 SmallVectorImpl<SDValue> &InVals) const;
145 LowerCall(SDValue Chain, SDValue Callee,
146 CallingConv::ID CallConv, bool isVarArg, bool &isTailCall,
147 const SmallVectorImpl<ISD::OutputArg> &Outs,
148 const SmallVectorImpl<SDValue> &OutVals,
149 const SmallVectorImpl<ISD::InputArg> &Ins,
150 DebugLoc dl, SelectionDAG &DAG,
151 SmallVectorImpl<SDValue> &InVals) const;
154 LowerReturn(SDValue Chain,
155 CallingConv::ID CallConv, bool isVarArg,
156 const SmallVectorImpl<ISD::OutputArg> &Outs,
157 const SmallVectorImpl<SDValue> &OutVals,
158 DebugLoc dl, SelectionDAG &DAG) const;
160 SDValue ExpandStore(SDNode *N, SelectionDAG &DAG) const;
161 SDValue ExpandLoad(SDNode *N, SelectionDAG &DAG) const;
162 SDValue ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG) const;
163 SDValue ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG) const;
164 SDValue ExpandFrameIndex(SDNode *N, SelectionDAG &DAG) const;
166 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
167 SDValue PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
168 SDValue PerformStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const;
170 // This function returns the Tmp Offset for FrameIndex. If any TmpOffset
171 // already exists for the FI then it returns the same else it creates the
172 // new offset and returns.
173 unsigned GetTmpOffsetForFI(unsigned FI, unsigned slot_size,
174 MachineFunction &MF) const;
175 void ResetTmpOffsetMap(SelectionDAG &DAG) const;
176 void InitReservedFrameCount(const Function *F,
177 SelectionDAG &DAG) const;
179 /// getFunctionAlignment - Return the Log2 alignment of this function.
180 virtual unsigned getFunctionAlignment(const Function *) const {
181 // FIXME: The function never seems to be aligned.
185 // If the Node is a BUILD_PAIR representing a direct Address,
186 // then this function will return true.
187 bool isDirectAddress(const SDValue &Op) const;
189 // If the Node is a DirectAddress in ROM_SPACE then this
190 // function will return true
191 bool isRomAddress(const SDValue &Op) const;
193 // Extract the Lo and Hi component of Op.
194 void GetExpandedParts(SDValue Op, SelectionDAG &DAG, SDValue &Lo,
198 // Load pointer can be a direct or indirect address. In PIC16 direct
199 // addresses need Banksel and Indirect addresses need to be loaded to
200 // FSR first. Handle address specific cases here.
201 void LegalizeAddress(SDValue Ptr, SelectionDAG &DAG, SDValue &Chain,
202 SDValue &NewPtr, unsigned &Offset, DebugLoc dl) const;
204 // FrameIndex should be broken down into ExternalSymbol and FrameOffset.
205 void LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG, SDValue &ES,
208 // For indirect calls data address of the callee frame need to be
209 // extracted. This function fills the arguments DataAddr_Lo and
210 // DataAddr_Hi with the address of the callee frame.
211 void GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
212 SDValue &DataAddr_Lo, SDValue &DataAddr_Hi,
213 SelectionDAG &DAG) const;
215 // We can not have both operands of a binary operation in W.
216 // This function is used to put one operand on stack and generate a load.
217 SDValue ConvertToMemOperand(SDValue Op, SelectionDAG &DAG,
220 // This function checks if we need to put an operand of an operation on
221 // stack and generate a load or not.
222 // DAG parameter is required to access DAG information during
224 bool NeedToConvertToMemOp(SDValue Op, unsigned &MemOp,
225 SelectionDAG &DAG) const;
227 /// Subtarget - Keep a pointer to the PIC16Subtarget around so that we can
228 /// make the right decision when generating code for different targets.
229 const PIC16Subtarget *Subtarget;
232 // Extending the LIB Call framework of LLVM
233 // to hold the names of PIC16Libcalls.
234 const char *PIC16LibcallNames[PIC16ISD::PIC16UnknownCall];
236 // To set and retrieve the lib call names.
237 void setPIC16LibcallName(PIC16ISD::PIC16Libcall Call, const char *Name);
238 const char *getPIC16LibcallName(PIC16ISD::PIC16Libcall Call) const;
240 // Make PIC16 Libcall.
241 SDValue MakePIC16Libcall(PIC16ISD::PIC16Libcall Call, EVT RetVT,
242 const SDValue *Ops, unsigned NumOps, bool isSigned,
243 SelectionDAG &DAG, DebugLoc dl) const;
245 // Check if operation has a direct load operand.
246 inline bool isDirectLoad(const SDValue Op) const;
250 #endif // PIC16ISELLOWERING_H