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"
26 // Start the numbering from where ISD NodeType finishes.
27 FIRST_NUMBER = ISD::BUILTIN_OP_END,
29 Lo, // Low 8-bits of GlobalAddress.
30 Hi, // High 8-bits of GlobalAddress.
39 LSLF, // PIC16 Logical shift left
40 LRLF, // PIC16 Logical shift right
41 RLF, // Rotate left through carry
42 RRF, // Rotate right through carry
43 CALL, // PIC16 Call instruction
44 SUBCC, // Compare for equality or inequality.
45 SELECT_ICC, // Psuedo to be caught in schedular and expanded to brcond.
46 BRCOND, // Conditional branch.
50 // Keep track of different address spaces.
52 RAM_SPACE = 0, // RAM address space
53 ROM_SPACE = 1 // ROM address space number is 1
65 //===--------------------------------------------------------------------===//
66 // TargetLowering Implementation
67 //===--------------------------------------------------------------------===//
68 class PIC16TargetLowering : public TargetLowering {
70 explicit PIC16TargetLowering(PIC16TargetMachine &TM);
72 /// getTargetNodeName - This method returns the name of a target specific
74 virtual const char *getTargetNodeName(unsigned Opcode) const;
75 /// getSetCCResultType - Return the ISD::SETCC ValueType
76 virtual MVT getSetCCResultType(MVT ValType) const;
77 SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
78 SDValue LowerShift(SDValue Op, SelectionDAG &DAG);
79 SDValue LowerADD(SDValue Op, SelectionDAG &DAG);
80 SDValue LowerSUB(SDValue Op, SelectionDAG &DAG);
81 SDValue LowerBinOp(SDValue Op, SelectionDAG &DAG);
82 SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
83 SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
84 SDValue LowerCallReturn(SDValue Op, SDValue Chain, SDValue FrameAddress,
85 SDValue InFlag, SelectionDAG &DAG);
86 SDValue LowerCallArguments(SDValue Op, SDValue Chain, SDValue FrameAddress,
87 SDValue InFlag, SelectionDAG &DAG);
88 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
89 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
90 SDValue getPIC16Cmp(SDValue LHS, SDValue RHS, unsigned OrigCC, SDValue &CC,
91 SelectionDAG &DAG, DebugLoc dl);
92 virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
93 MachineBasicBlock *MBB);
96 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
97 virtual void ReplaceNodeResults(SDNode *N,
98 SmallVectorImpl<SDValue> &Results,
100 virtual void LowerOperationWrapper(SDNode *N,
101 SmallVectorImpl<SDValue> &Results,
104 SDValue ExpandStore(SDNode *N, SelectionDAG &DAG);
105 SDValue ExpandLoad(SDNode *N, SelectionDAG &DAG);
106 //SDValue ExpandAdd(SDNode *N, SelectionDAG &DAG);
107 SDValue ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG);
108 SDValue ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG);
109 SDValue ExpandFrameIndex(SDNode *N, SelectionDAG &DAG);
111 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
112 SDValue PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
115 // If the Node is a BUILD_PAIR representing representing an Address
116 // then this function will return true
117 bool isDirectAddress(const SDValue &Op);
119 // If the Node is a DirectAddress in ROM_SPACE then this
120 // function will return true
121 bool isRomAddress(const SDValue &Op);
123 // To extract chain value from the SDValue Nodes
124 // This function will help to maintain the chain extracting
125 // code at one place. In case of any change in future it will
126 // help maintain the code
127 SDValue getChain(SDValue &Op);
129 SDValue getOutFlag(SDValue &Op);
132 // Extract the Lo and Hi component of Op.
133 void GetExpandedParts(SDValue Op, SelectionDAG &DAG, SDValue &Lo,
137 // Load pointer can be a direct or indirect address. In PIC16 direct
138 // addresses need Banksel and Indirect addresses need to be loaded to
139 // FSR first. Handle address specific cases here.
140 void LegalizeAddress(SDValue Ptr, SelectionDAG &DAG, SDValue &Chain,
141 SDValue &NewPtr, unsigned &Offset, DebugLoc dl);
143 // FrameIndex should be broken down into ExternalSymbol and FrameOffset.
144 void LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG, SDValue &ES,
147 // We can not have both operands of a binary operation in W.
148 // This function is used to put one operand on stack and generate a load.
149 SDValue ConvertToMemOperand(SDValue Op, SelectionDAG &DAG, DebugLoc dl);
151 // This function checks if we need to put an operand of an operation on
152 // stack and generate a load or not.
153 bool NeedToConvertToMemOp(SDValue Op, unsigned &MemOp);
155 /// Subtarget - Keep a pointer to the PIC16Subtarget around so that we can
156 /// make the right decision when generating code for different targets.
157 const PIC16Subtarget *Subtarget;
160 // Extending the LIB Call framework of LLVM
161 // To hold the names of PIC16Libcalls
162 const char *PIC16LibcallNames[PIC16ISD::PIC16UnknownCall];
164 // To set and retrieve the lib call names
165 void setPIC16LibcallName(PIC16ISD::PIC16Libcall Call, const char *Name);
166 const char *getPIC16LibcallName(PIC16ISD::PIC16Libcall Call);
168 // Make PIC16 Libcall
169 SDValue MakePIC16Libcall(PIC16ISD::PIC16Libcall Call, MVT RetVT,
170 const SDValue *Ops, unsigned NumOps, bool isSigned,
171 SelectionDAG &DAG, DebugLoc dl);
173 // Check if operation has a direct load operand.
174 inline bool isDirectLoad(const SDValue Op);
176 // Create the symbol and index for function frame
177 void getCurrentFrameIndex(SelectionDAG &DAG, SDValue &ES,
178 unsigned SlotSize, int &FI);
180 SDValue getCurrentFrame(SelectionDAG &DAG);
184 #endif // PIC16ISELLOWERING_H