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