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 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);
135 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
136 return getNode(ISD::CopyToReg, MVT::Other, Chain,
137 getRegister(Reg, N.getValueType()), N);
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,
145 std::vector<MVT::ValueType> VTs;
146 VTs.push_back(MVT::Other);
147 VTs.push_back(MVT::Flag);
148 std::vector<SDOperand> Ops;
149 Ops.push_back(Chain);
150 Ops.push_back(getRegister(Reg, N.getValueType()));
152 if (Flag.Val) Ops.push_back(Flag);
153 return getNode(ISD::CopyToReg, VTs, Ops);
156 // Similar to last getCopyToReg() except parameter Reg is a SDOperand
157 SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
159 std::vector<MVT::ValueType> VTs;
160 VTs.push_back(MVT::Other);
161 VTs.push_back(MVT::Flag);
162 std::vector<SDOperand> Ops;
163 Ops.push_back(Chain);
166 if (Flag.Val) Ops.push_back(Flag);
167 return getNode(ISD::CopyToReg, VTs, Ops);
170 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
171 std::vector<MVT::ValueType> ResultTys;
172 ResultTys.push_back(VT);
173 ResultTys.push_back(MVT::Other);
174 std::vector<SDOperand> Ops;
175 Ops.push_back(Chain);
176 Ops.push_back(getRegister(Reg, VT));
177 return getNode(ISD::CopyFromReg, ResultTys, Ops);
180 // This version of the getCopyFromReg method takes an extra operand, which
181 // indicates that there is potentially an incoming flag value (if Flag is not
182 // null) and that there should be a flag result.
183 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
185 std::vector<MVT::ValueType> ResultTys;
186 ResultTys.push_back(VT);
187 ResultTys.push_back(MVT::Other);
188 ResultTys.push_back(MVT::Flag);
189 std::vector<SDOperand> Ops;
190 Ops.push_back(Chain);
191 Ops.push_back(getRegister(Reg, VT));
192 if (Flag.Val) Ops.push_back(Flag);
193 return getNode(ISD::CopyFromReg, ResultTys, Ops);
196 SDOperand getCondCode(ISD::CondCode Cond);
198 /// getZeroExtendInReg - Return the expression required to zero extend the Op
199 /// value assuming it was the smaller SrcTy value.
200 SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
202 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
203 /// a flag result (to ensure it's not CSE'd).
204 SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
205 std::vector<MVT::ValueType> ResultTys;
206 ResultTys.push_back(MVT::Other);
207 ResultTys.push_back(MVT::Flag);
208 std::vector<SDOperand> Ops;
209 Ops.push_back(Chain);
211 return getNode(ISD::CALLSEQ_START, ResultTys, Ops);
214 /// getNode - Gets or creates the specified node.
216 SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
217 SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
218 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
219 SDOperand N1, SDOperand N2);
220 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
221 SDOperand N1, SDOperand N2, SDOperand N3);
222 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
223 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
224 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
225 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
227 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
228 std::vector<SDOperand> &Children);
229 SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
230 std::vector<SDOperand> &Ops);
232 /// getSetCC - Helper function to make it easier to build SetCC's if you just
233 /// have an ISD::CondCode instead of an SDOperand.
235 SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
236 ISD::CondCode Cond) {
237 return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
240 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
241 /// just have an ISD::CondCode instead of an SDOperand.
243 SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
244 SDOperand True, SDOperand False, ISD::CondCode Cond) {
245 MVT::ValueType VT = True.getValueType();
246 return getNode(ISD::SELECT_CC, VT, LHS, RHS, True, False,getCondCode(Cond));
249 /// getVAArg - VAArg produces a result and token chain, and takes a pointer
250 /// and a source value as input.
251 SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
254 /// getLoad - Loads are not normal binary operators: their result type is not
255 /// determined by their operands, and they produce a value AND a token chain.
257 SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
259 SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
260 SDOperand Ptr, SDOperand SV);
261 SDOperand getExtLoad(unsigned Opcode, MVT::ValueType VT, SDOperand Chain,
262 SDOperand Ptr, SDOperand SV, MVT::ValueType EVT);
264 // getSrcValue - construct a node to track a Value* through the backend
265 SDOperand getSrcValue(const Value* I, int offset = 0);
267 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
268 /// specified operands. If the resultant node already exists in the DAG,
269 /// this does not modify the specified node, instead it returns the node that
270 /// already exists. If the resultant node does not exist in the DAG, the
271 /// input node is returned. As a degenerate case, if you specify the same
272 /// input operands as the node already has, the input node is returned.
273 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
274 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
275 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
277 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
278 SDOperand Op3, SDOperand Op4);
279 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
280 SDOperand Op3, SDOperand Op4, SDOperand Op5);
281 SDOperand UpdateNodeOperands(SDOperand N, const std::vector<SDOperand> &Op);
283 /// SelectNodeTo - These are used for target selectors to *mutate* the
284 /// specified node to have the specified return type, Target opcode, and
285 /// operands. Note that target opcodes are stored as
286 /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
287 /// of the resultant node is returned.
288 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
289 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
291 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
292 SDOperand Op1, SDOperand Op2);
293 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
294 SDOperand Op1, SDOperand Op2, SDOperand Op3);
295 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
296 SDOperand Op1, SDOperand Op2, SDOperand Op3,
298 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
299 SDOperand Op1, SDOperand Op2, SDOperand Op3,
300 SDOperand Op4, SDOperand Op5);
301 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
302 SDOperand Op1, SDOperand Op2, SDOperand Op3,
303 SDOperand Op4, SDOperand Op5, SDOperand Op6);
304 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
305 SDOperand Op1, SDOperand Op2, SDOperand Op3,
306 SDOperand Op4, SDOperand Op5, SDOperand Op6,
308 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
309 SDOperand Op1, SDOperand Op2, SDOperand Op3,
310 SDOperand Op4, SDOperand Op5, SDOperand Op6,
311 SDOperand Op7, SDOperand Op8);
312 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
313 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
314 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
315 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
317 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
318 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
319 SDOperand Op3, SDOperand Op4);
320 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
321 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
322 SDOperand Op3, SDOperand Op4, SDOperand Op5);
324 /// getTargetNode - These are used for target selectors to create a new node
325 /// with specified return type(s), target opcode, and operands.
327 /// Note that getTargetNode returns the resultant node. If there is already a
328 /// node of the specified opcode and operands, it returns that node instead of
330 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT);
331 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
333 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
334 SDOperand Op1, SDOperand Op2);
335 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
336 SDOperand Op1, SDOperand Op2, SDOperand Op3);
337 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
338 SDOperand Op1, SDOperand Op2, SDOperand Op3,
340 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
341 SDOperand Op1, SDOperand Op2, SDOperand Op3,
342 SDOperand Op4, SDOperand Op5);
343 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
344 SDOperand Op1, SDOperand Op2, SDOperand Op3,
345 SDOperand Op4, SDOperand Op5, SDOperand Op6);
346 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
347 SDOperand Op1, SDOperand Op2, SDOperand Op3,
348 SDOperand Op4, SDOperand Op5, SDOperand Op6,
350 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
351 SDOperand Op1, SDOperand Op2, SDOperand Op3,
352 SDOperand Op4, SDOperand Op5, SDOperand Op6,
353 SDOperand Op7, SDOperand Op8);
354 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
355 std::vector<SDOperand> &Ops);
356 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
357 MVT::ValueType VT2, SDOperand Op1);
358 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
359 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
360 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
361 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
363 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
364 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
365 SDOperand Op3, SDOperand Op4);
366 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
367 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
368 SDOperand Op3, SDOperand Op4, SDOperand Op5);
369 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
370 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
371 SDOperand Op3, SDOperand Op4, SDOperand Op5,
373 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
374 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
375 SDOperand Op3, SDOperand Op4, SDOperand Op5,
376 SDOperand Op6, SDOperand Op7);
377 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
378 MVT::ValueType VT2, MVT::ValueType VT3,
379 SDOperand Op1, SDOperand Op2);
380 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
381 MVT::ValueType VT2, MVT::ValueType VT3,
382 SDOperand Op1, SDOperand Op2,
383 SDOperand Op3, SDOperand Op4, SDOperand Op5);
384 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
385 MVT::ValueType VT2, MVT::ValueType VT3,
386 SDOperand Op1, SDOperand Op2,
387 SDOperand Op3, SDOperand Op4, SDOperand Op5,
389 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
390 MVT::ValueType VT2, MVT::ValueType VT3,
391 SDOperand Op1, SDOperand Op2,
392 SDOperand Op3, SDOperand Op4, SDOperand Op5,
393 SDOperand Op6, SDOperand Op7);
394 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
395 MVT::ValueType VT2, std::vector<SDOperand> &Ops);
397 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
398 /// This can cause recursive merging of nodes in the DAG. Use the first
399 /// version if 'From' is known to have a single result, use the second
400 /// if you have two nodes with identical results, use the third otherwise.
402 /// These methods all take an optional vector, which (if not null) is
403 /// populated with any nodes that are deleted from the SelectionDAG, due to
404 /// new equivalences that are discovered.
406 void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
407 std::vector<SDNode*> *Deleted = 0);
408 void ReplaceAllUsesWith(SDNode *From, SDNode *To,
409 std::vector<SDNode*> *Deleted = 0);
410 void ReplaceAllUsesWith(SDNode *From, const std::vector<SDOperand> &To,
411 std::vector<SDNode*> *Deleted = 0);
413 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
414 /// uses of other values produced by From.Val alone. The Deleted vector is
415 /// handled the same was as for ReplaceAllUsesWith, but it is required for
417 void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
418 std::vector<SDNode*> &Deleted);
420 /// DeleteNode - Remove the specified node from the system. This node must
421 /// have no referrers.
422 void DeleteNode(SDNode *N);
426 /// InsertISelMapEntry - A helper function to insert a key / element pair
427 /// into a SDOperand to SDOperand map. This is added to avoid the map
428 /// insertion operator from being inlined.
429 static void InsertISelMapEntry(std::map<SDOperand, SDOperand> &Map,
430 SDNode *Key, unsigned KeyResNo,
431 SDNode *Element, unsigned ElementResNo);
434 void RemoveNodeFromCSEMaps(SDNode *N);
435 SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
436 SDNode **FindModifiedNodeSlot(SDNode *N, SDOperand Op);
437 SDNode **FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2);
438 SDNode **FindModifiedNodeSlot(SDNode *N, const std::vector<SDOperand> &Ops);
440 void DestroyDeadNode(SDNode *N);
441 void DeleteNodeNotInCSEMaps(SDNode *N);
442 void setNodeValueTypes(SDNode *N, std::vector<MVT::ValueType> &RetVals);
443 void setNodeValueTypes(SDNode *N, MVT::ValueType VT1, MVT::ValueType VT2);
446 /// SimplifySetCC - Try to simplify a setcc built with the specified operands
447 /// and cc. If unable to simplify it, return a null SDOperand.
448 SDOperand SimplifySetCC(MVT::ValueType VT, SDOperand N1,
449 SDOperand N2, ISD::CondCode Cond);
451 // List of non-single value types.
452 std::list<std::vector<MVT::ValueType> > VTList;
454 // Maps to auto-CSE operations.
455 std::map<std::pair<unsigned, MVT::ValueType>, SDNode *> NullaryOps;
456 std::map<std::pair<unsigned, std::pair<SDOperand, MVT::ValueType> >,
458 std::map<std::pair<unsigned, std::pair<SDOperand, SDOperand> >,
461 std::map<std::pair<unsigned, MVT::ValueType>, RegisterSDNode*> RegNodes;
462 std::vector<CondCodeSDNode*> CondCodeNodes;
464 std::map<std::pair<SDOperand, std::pair<SDOperand, MVT::ValueType> >,
467 std::map<std::pair<const GlobalValue*, int>, SDNode*> GlobalValues;
468 std::map<std::pair<const GlobalValue*, int>, SDNode*> TargetGlobalValues;
469 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
470 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstants;
471 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> ConstantFPs;
472 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstantFPs;
473 std::map<int, SDNode*> FrameIndices, TargetFrameIndices, JumpTableIndices,
474 TargetJumpTableIndices;
475 std::map<std::pair<Constant *,
476 std::pair<int, unsigned> >, SDNode*> ConstantPoolIndices;
477 std::map<std::pair<Constant *,
478 std::pair<int, unsigned> >, SDNode*> TargetConstantPoolIndices;
479 std::map<MachineBasicBlock *, SDNode*> BBNodes;
480 std::vector<SDNode*> ValueTypeNodes;
481 std::map<std::string, SDNode*> ExternalSymbols;
482 std::map<std::string, SDNode*> TargetExternalSymbols;
483 std::map<std::string, StringSDNode*> StringNodes;
484 std::map<std::pair<unsigned,
485 std::pair<MVT::ValueType, std::vector<SDOperand> > >,
486 SDNode*> OneResultNodes;
487 std::map<std::pair<unsigned,
488 std::pair<std::vector<MVT::ValueType>,
489 std::vector<SDOperand> > >,
490 SDNode*> ArbitraryNodes;
493 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
494 typedef SelectionDAG::allnodes_iterator nodes_iterator;
495 static nodes_iterator nodes_begin(SelectionDAG *G) {
496 return G->allnodes_begin();
498 static nodes_iterator nodes_end(SelectionDAG *G) {
499 return G->allnodes_end();
503 } // end namespace llvm