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