SelectionDAG.h revision 8a842cf8287ee957e15b95ceeb6ee5f189caba3d 
1//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the SelectionDAG class, and transitively defines the
11// SDNode class and subclasses.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_CODEGEN_SELECTIONDAG_H
16#define LLVM_CODEGEN_SELECTIONDAG_H
17
18#include "llvm/CodeGen/SelectionDAGNodes.h"
19#include "llvm/CodeGen/SelectionDAGCSEMap.h"
20#include "llvm/ADT/ilist"
21
22#include <list>
23#include <map>
24#include <set>
25#include <string>
26
27namespace llvm {
28  class TargetLowering;
29  class TargetMachine;
30  class MachineDebugInfo;
31  class MachineFunction;
32
33/// SelectionDAG class - This is used to represent a portion of an LLVM function
34/// in a low-level Data Dependence DAG representation suitable for instruction
35/// selection.  This DAG is constructed as the first step of instruction
36/// selection in order to allow implementation of machine specific optimizations
37/// and code simplifications.
38///
39/// The representation used by the SelectionDAG is a target-independent
40/// representation, which has some similarities to the GCC RTL representation,
41/// but is significantly more simple, powerful, and is a graph form instead of a
42/// linear form.
43///
44class SelectionDAG {
45  TargetLowering &TLI;
46  MachineFunction &MF;
47  MachineDebugInfo *DI;
48
49  // Root - The root of the entire DAG.  EntryNode - The starting token.
50  SDOperand Root, EntryNode;
51
52  // AllNodes - A linked list of nodes in the current DAG.
53  ilist<SDNode> AllNodes;
54
55  // ValueNodes - track SrcValue nodes
56  std::map<std::pair<const Value*, int>, SDNode*> ValueNodes;
57
58public:
59  SelectionDAG(TargetLowering &tli, MachineFunction &mf, MachineDebugInfo *di)
60  : TLI(tli), MF(mf), DI(di) {
61    EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
62  }
63  ~SelectionDAG();
64
65  MachineFunction &getMachineFunction() const { return MF; }
66  const TargetMachine &getTarget() const;
67  TargetLowering &getTargetLoweringInfo() const { return TLI; }
68  MachineDebugInfo *getMachineDebugInfo() const { return DI; }
69
70  /// viewGraph - Pop up a ghostview window with the DAG rendered using 'dot'.
71  ///
72  void viewGraph();
73
74
75  typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
76  allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
77  allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
78  typedef ilist<SDNode>::iterator allnodes_iterator;
79  allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
80  allnodes_iterator allnodes_end() { return AllNodes.end(); }
81
82  /// getRoot - Return the root tag of the SelectionDAG.
83  ///
84  const SDOperand &getRoot() const { return Root; }
85
86  /// getEntryNode - Return the token chain corresponding to the entry of the
87  /// function.
88  const SDOperand &getEntryNode() const { return EntryNode; }
89
90  /// setRoot - Set the current root tag of the SelectionDAG.
91  ///
92  const SDOperand &setRoot(SDOperand N) { return Root = N; }
93
94  /// Combine - This iterates over the nodes in the SelectionDAG, folding
95  /// certain types of nodes together, or eliminating superfluous nodes.  When
96  /// the AfterLegalize argument is set to 'true', Combine takes care not to
97  /// generate any nodes that will be illegal on the target.
98  void Combine(bool AfterLegalize);
99
100  /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
101  /// compatible with the target instruction selector, as indicated by the
102  /// TargetLowering object.
103  ///
104  /// Note that this is an involved process that may invalidate pointers into
105  /// the graph.
106  void Legalize();
107
108  /// RemoveDeadNodes - This method deletes all unreachable nodes in the
109  /// SelectionDAG.
110  void RemoveDeadNodes();
111
112  SDOperand getString(const std::string &Val);
113  SDOperand getConstant(uint64_t Val, MVT::ValueType VT);
114  SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT);
115  SDOperand getConstantFP(double Val, MVT::ValueType VT);
116  SDOperand getTargetConstantFP(double Val, MVT::ValueType VT);
117  SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
118                             int offset = 0);
119  SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
120                                   int offset = 0);
121  SDOperand getFrameIndex(int FI, MVT::ValueType VT);
122  SDOperand getTargetFrameIndex(int FI, MVT::ValueType VT);
123  SDOperand getJumpTable(int JTI, MVT::ValueType VT);
124  SDOperand getTargetJumpTable(int JTI, MVT::ValueType VT);
125  SDOperand getConstantPool(Constant *C, MVT::ValueType VT,
126                           unsigned Alignment=0,  int offset = 0);
127  SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT,
128                                  unsigned Alignment=0, int offset = 0);
129  SDOperand getBasicBlock(MachineBasicBlock *MBB);
130  SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
131  SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
132  SDOperand getValueType(MVT::ValueType);
133  SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
134
135  SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
136    return getNode(ISD::CopyToReg, MVT::Other, Chain,
137                   getRegister(Reg, N.getValueType()), N);
138  }
139
140  // This version of the getCopyToReg method takes an extra operand, which
141  // indicates that there is potentially an incoming flag value (if Flag is not
142  // null) and that there should be a flag result.
143  SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
144                         SDOperand Flag) {
145    std::vector<MVT::ValueType> VTs;
146    VTs.push_back(MVT::Other);
147    VTs.push_back(MVT::Flag);
148    SDOperand Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
149    return getNode(ISD::CopyToReg, VTs, Ops, Flag.Val ? 4 : 3);
150  }
151
152  // Similar to last getCopyToReg() except parameter Reg is a SDOperand
153  SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
154                         SDOperand Flag) {
155    std::vector<MVT::ValueType> VTs;
156    VTs.push_back(MVT::Other);
157    VTs.push_back(MVT::Flag);
158    SDOperand Ops[] = { Chain, Reg, N, Flag };
159    return getNode(ISD::CopyToReg, VTs, Ops, Flag.Val ? 4 : 3);
160  }
161
162  SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
163    std::vector<MVT::ValueType> ResultTys;
164    ResultTys.push_back(VT);
165    ResultTys.push_back(MVT::Other);
166    SDOperand Ops[] = { Chain, getRegister(Reg, VT) };
167    return getNode(ISD::CopyFromReg, ResultTys, Ops, 2);
168  }
169
170  // This version of the getCopyFromReg method takes an extra operand, which
171  // indicates that there is potentially an incoming flag value (if Flag is not
172  // null) and that there should be a flag result.
173  SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
174                           SDOperand Flag) {
175    std::vector<MVT::ValueType> ResultTys;
176    ResultTys.push_back(VT);
177    ResultTys.push_back(MVT::Other);
178    ResultTys.push_back(MVT::Flag);
179    SDOperand Ops[] = { Chain, getRegister(Reg, VT), Flag };
180    return getNode(ISD::CopyFromReg, ResultTys, Ops, Flag.Val ? 3 : 2);
181  }
182
183  SDOperand getCondCode(ISD::CondCode Cond);
184
185  /// getZeroExtendInReg - Return the expression required to zero extend the Op
186  /// value assuming it was the smaller SrcTy value.
187  SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
188
189  /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
190  /// a flag result (to ensure it's not CSE'd).
191  SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
192    std::vector<MVT::ValueType> ResultTys;
193    ResultTys.push_back(MVT::Other);
194    ResultTys.push_back(MVT::Flag);
195    SDOperand Ops[] = { Chain,  Op };
196    return getNode(ISD::CALLSEQ_START, ResultTys, Ops, 2);
197  }
198
199  /// getNode - Gets or creates the specified node.
200  ///
201  SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
202  SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
203  SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
204                    SDOperand N1, SDOperand N2);
205  SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
206                    SDOperand N1, SDOperand N2, SDOperand N3);
207  SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
208                    SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
209  SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
210                    SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
211                    SDOperand N5);
212  SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
213                    const SDOperand *Ops, unsigned NumOps);
214  SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
215                    const SDOperand *Ops, unsigned NumOps);
216
217  /// getSetCC - Helper function to make it easier to build SetCC's if you just
218  /// have an ISD::CondCode instead of an SDOperand.
219  ///
220  SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
221                     ISD::CondCode Cond) {
222    return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
223  }
224
225  /// getSelectCC - Helper function to make it easier to build SelectCC's if you
226  /// just have an ISD::CondCode instead of an SDOperand.
227  ///
228  SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
229                        SDOperand True, SDOperand False, ISD::CondCode Cond) {
230    MVT::ValueType VT = True.getValueType();
231    return getNode(ISD::SELECT_CC, VT, LHS, RHS, True, False,getCondCode(Cond));
232  }
233
234  /// getVAArg - VAArg produces a result and token chain, and takes a pointer
235  /// and a source value as input.
236  SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
237                     SDOperand SV);
238
239  /// getLoad - Loads are not normal binary operators: their result type is not
240  /// determined by their operands, and they produce a value AND a token chain.
241  ///
242  SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
243                    SDOperand SV);
244  SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
245                       SDOperand Ptr, SDOperand SV);
246  SDOperand getExtLoad(unsigned Opcode, MVT::ValueType VT, SDOperand Chain,
247                       SDOperand Ptr, SDOperand SV, MVT::ValueType EVT);
248
249  // getSrcValue - construct a node to track a Value* through the backend
250  SDOperand getSrcValue(const Value* I, int offset = 0);
251
252  /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
253  /// specified operands.  If the resultant node already exists in the DAG,
254  /// this does not modify the specified node, instead it returns the node that
255  /// already exists.  If the resultant node does not exist in the DAG, the
256  /// input node is returned.  As a degenerate case, if you specify the same
257  /// input operands as the node already has, the input node is returned.
258  SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
259  SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
260  SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
261                               SDOperand Op3);
262  SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
263                               SDOperand Op3, SDOperand Op4);
264  SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
265                               SDOperand Op3, SDOperand Op4, SDOperand Op5);
266  SDOperand UpdateNodeOperands(SDOperand N, SDOperand *Ops, unsigned NumOps);
267
268  /// SelectNodeTo - These are used for target selectors to *mutate* the
269  /// specified node to have the specified return type, Target opcode, and
270  /// operands.  Note that target opcodes are stored as
271  /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field.  The 0th value
272  /// of the resultant node is returned.
273  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
274  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
275                         SDOperand Op1);
276  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
277                         SDOperand Op1, SDOperand Op2);
278  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
279                         SDOperand Op1, SDOperand Op2, SDOperand Op3);
280  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
281                         SDOperand Op1, SDOperand Op2, SDOperand Op3,
282                         SDOperand Op4);
283  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
284                         SDOperand Op1, SDOperand Op2, SDOperand Op3,
285                         SDOperand Op4, SDOperand Op5);
286  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
287                         SDOperand Op1, SDOperand Op2, SDOperand Op3,
288                         SDOperand Op4, SDOperand Op5, SDOperand Op6);
289  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
290                         SDOperand Op1, SDOperand Op2, SDOperand Op3,
291                         SDOperand Op4, SDOperand Op5, SDOperand Op6,
292			 SDOperand Op7);
293  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
294                         SDOperand Op1, SDOperand Op2, SDOperand Op3,
295                         SDOperand Op4, SDOperand Op5, SDOperand Op6,
296			 SDOperand Op7, SDOperand Op8);
297  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
298                         MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
299  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
300                         MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
301                         SDOperand Op3);
302  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
303                         MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
304                         SDOperand Op3, SDOperand Op4);
305  SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
306                         MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
307                         SDOperand Op3, SDOperand Op4, SDOperand Op5);
308
309  /// getTargetNode - These are used for target selectors to create a new node
310  /// with specified return type(s), target opcode, and operands.
311  ///
312  /// Note that getTargetNode returns the resultant node.  If there is already a
313  /// node of the specified opcode and operands, it returns that node instead of
314  /// the current one.
315  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT);
316  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
317                        SDOperand Op1);
318  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
319                        SDOperand Op1, SDOperand Op2);
320  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
321                        SDOperand Op1, SDOperand Op2, SDOperand Op3);
322  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
323                        SDOperand Op1, SDOperand Op2, SDOperand Op3,
324                        SDOperand Op4);
325  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
326                        SDOperand Op1, SDOperand Op2, SDOperand Op3,
327                        SDOperand Op4, SDOperand Op5);
328  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
329                        SDOperand Op1, SDOperand Op2, SDOperand Op3,
330                        SDOperand Op4, SDOperand Op5, SDOperand Op6);
331  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
332                        SDOperand Op1, SDOperand Op2, SDOperand Op3,
333                        SDOperand Op4, SDOperand Op5, SDOperand Op6,
334                        SDOperand Op7);
335  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
336                        SDOperand Op1, SDOperand Op2, SDOperand Op3,
337                        SDOperand Op4, SDOperand Op5, SDOperand Op6,
338                        SDOperand Op7, SDOperand Op8);
339  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
340                        const SDOperand *Ops, unsigned NumOps);
341  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
342                        MVT::ValueType VT2, SDOperand Op1);
343  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
344                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
345  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
346                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
347                        SDOperand Op3);
348  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
349                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
350                        SDOperand Op3, SDOperand Op4);
351  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
352                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
353                        SDOperand Op3, SDOperand Op4, SDOperand Op5);
354  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
355                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
356                        SDOperand Op3, SDOperand Op4, SDOperand Op5,
357                        SDOperand Op6);
358  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
359                        MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
360                        SDOperand Op3, SDOperand Op4, SDOperand Op5,
361                        SDOperand Op6, SDOperand Op7);
362  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
363                        MVT::ValueType VT2, MVT::ValueType VT3,
364                        SDOperand Op1, SDOperand Op2);
365  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
366                        MVT::ValueType VT2, MVT::ValueType VT3,
367                        SDOperand Op1, SDOperand Op2,
368                        SDOperand Op3, SDOperand Op4, SDOperand Op5);
369  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
370                        MVT::ValueType VT2, MVT::ValueType VT3,
371                        SDOperand Op1, SDOperand Op2,
372                        SDOperand Op3, SDOperand Op4, SDOperand Op5,
373                        SDOperand Op6);
374  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
375                        MVT::ValueType VT2, MVT::ValueType VT3,
376                        SDOperand Op1, SDOperand Op2,
377                        SDOperand Op3, SDOperand Op4, SDOperand Op5,
378                        SDOperand Op6, SDOperand Op7);
379  SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
380                        MVT::ValueType VT2,
381                        const SDOperand *Ops, unsigned NumOps);
382
383  /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
384  /// This can cause recursive merging of nodes in the DAG.  Use the first
385  /// version if 'From' is known to have a single result, use the second
386  /// if you have two nodes with identical results, use the third otherwise.
387  ///
388  /// These methods all take an optional vector, which (if not null) is
389  /// populated with any nodes that are deleted from the SelectionDAG, due to
390  /// new equivalences that are discovered.
391  ///
392  void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
393                          std::vector<SDNode*> *Deleted = 0);
394  void ReplaceAllUsesWith(SDNode *From, SDNode *To,
395                          std::vector<SDNode*> *Deleted = 0);
396  void ReplaceAllUsesWith(SDNode *From, const SDOperand *To,
397                          std::vector<SDNode*> *Deleted = 0);
398
399  /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
400  /// uses of other values produced by From.Val alone.  The Deleted vector is
401  /// handled the same was as for ReplaceAllUsesWith, but it is required for
402  /// this method.
403  void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
404                                 std::vector<SDNode*> &Deleted);
405
406  /// DeleteNode - Remove the specified node from the system.  This node must
407  /// have no referrers.
408  void DeleteNode(SDNode *N);
409
410  /// AssignNodeIds - Assign a unique node id for each node in the DAG based on
411  /// their allnodes order. It returns the maximum id.
412  unsigned AssignNodeIds();
413
414  /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
415  /// based on their topological order. It returns the maximum id and a vector
416  /// of the SDNodes* in assigned order by reference.
417  unsigned AssignTopologicalOrder(std::vector<SDNode*> &TopOrder);
418
419  void dump() const;
420
421  /// InsertISelMapEntry - A helper function to insert a key / element pair
422  /// into a SDOperand to SDOperand map. This is added to avoid the map
423  /// insertion operator from being inlined.
424  static void InsertISelMapEntry(std::map<SDOperand, SDOperand> &Map,
425                                 SDNode *Key, unsigned KeyResNo,
426                                 SDNode *Element, unsigned ElementResNo);
427
428private:
429  void RemoveNodeFromCSEMaps(SDNode *N);
430  SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
431  SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op, void *&InsertPos);
432  SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2,
433                               void *&InsertPos);
434  SDNode *FindModifiedNodeSlot(SDNode *N, const SDOperand *Ops, unsigned NumOps,
435                               void *&InsertPos);
436
437  void DeleteNodeNotInCSEMaps(SDNode *N);
438  MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1);
439  MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1, MVT::ValueType VT2);
440  MVT::ValueType *getNodeValueTypes(std::vector<MVT::ValueType> &RetVals);
441
442
443  /// SimplifySetCC - Try to simplify a setcc built with the specified operands
444  /// and cc.  If unable to simplify it, return a null SDOperand.
445  SDOperand SimplifySetCC(MVT::ValueType VT, SDOperand N1,
446                          SDOperand N2, ISD::CondCode Cond);
447
448  // List of non-single value types.
449  std::list<std::vector<MVT::ValueType> > VTList;
450
451  // Maps to auto-CSE operations.
452  std::map<std::pair<unsigned, MVT::ValueType>, SDNode *> NullaryOps;
453
454  std::map<std::pair<unsigned, MVT::ValueType>, RegisterSDNode*> RegNodes;
455  std::vector<CondCodeSDNode*> CondCodeNodes;
456
457  std::map<std::pair<const GlobalValue*, int>, SDNode*> GlobalValues;
458  std::map<std::pair<const GlobalValue*, int>, SDNode*> TargetGlobalValues;
459  std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
460  std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstants;
461  std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> ConstantFPs;
462  std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstantFPs;
463  std::map<int, SDNode*> FrameIndices, TargetFrameIndices, JumpTableIndices,
464    TargetJumpTableIndices;
465  std::map<std::pair<Constant *,
466                     std::pair<int, unsigned> >, SDNode*> ConstantPoolIndices;
467  std::map<std::pair<Constant *,
468                 std::pair<int, unsigned> >, SDNode*> TargetConstantPoolIndices;
469  std::map<MachineBasicBlock *, SDNode*> BBNodes;
470  std::vector<SDNode*> ValueTypeNodes;
471  std::map<std::string, SDNode*> ExternalSymbols;
472  std::map<std::string, SDNode*> TargetExternalSymbols;
473  std::map<std::string, StringSDNode*> StringNodes;
474  SelectionDAGCSEMap CSEMap;
475};
476
477template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
478  typedef SelectionDAG::allnodes_iterator nodes_iterator;
479  static nodes_iterator nodes_begin(SelectionDAG *G) {
480    return G->allnodes_begin();
481  }
482  static nodes_iterator nodes_end(SelectionDAG *G) {
483    return G->allnodes_end();
484  }
485};
486
487}  // end namespace llvm
488
489#endif
490