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 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 getConstantPool(Constant *C, MVT::ValueType VT);
123 SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT);
124 SDOperand getBasicBlock(MachineBasicBlock *MBB);
125 SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
126 SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
127 SDOperand getValueType(MVT::ValueType);
128 SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
130 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
131 return getNode(ISD::CopyToReg, MVT::Other, Chain,
132 getRegister(Reg, N.getValueType()), N);
135 // This version of the getCopyToReg method takes an extra operand, which
136 // indicates that there is potentially an incoming flag value (if Flag is not
137 // null) and that there should be a flag result.
138 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
140 std::vector<MVT::ValueType> VTs;
141 VTs.push_back(MVT::Other);
142 VTs.push_back(MVT::Flag);
143 std::vector<SDOperand> Ops;
144 Ops.push_back(Chain);
145 Ops.push_back(getRegister(Reg, N.getValueType()));
147 if (Flag.Val) Ops.push_back(Flag);
148 return getNode(ISD::CopyToReg, VTs, Ops);
151 // Similar to last getCopyToReg() except parameter Reg is a SDOperand
152 SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
154 std::vector<MVT::ValueType> VTs;
155 VTs.push_back(MVT::Other);
156 VTs.push_back(MVT::Flag);
157 std::vector<SDOperand> Ops;
158 Ops.push_back(Chain);
161 if (Flag.Val) Ops.push_back(Flag);
162 return getNode(ISD::CopyToReg, VTs, Ops);
165 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
166 std::vector<MVT::ValueType> ResultTys;
167 ResultTys.push_back(VT);
168 ResultTys.push_back(MVT::Other);
169 std::vector<SDOperand> Ops;
170 Ops.push_back(Chain);
171 Ops.push_back(getRegister(Reg, VT));
172 return getNode(ISD::CopyFromReg, ResultTys, Ops);
175 // This version of the getCopyFromReg method takes an extra operand, which
176 // indicates that there is potentially an incoming flag value (if Flag is not
177 // null) and that there should be a flag result.
178 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
180 std::vector<MVT::ValueType> ResultTys;
181 ResultTys.push_back(VT);
182 ResultTys.push_back(MVT::Other);
183 ResultTys.push_back(MVT::Flag);
184 std::vector<SDOperand> Ops;
185 Ops.push_back(Chain);
186 Ops.push_back(getRegister(Reg, VT));
187 if (Flag.Val) Ops.push_back(Flag);
188 return getNode(ISD::CopyFromReg, ResultTys, Ops);
191 /// getCall - Note that this destroys the vector of RetVals passed in.
193 SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
194 SDOperand Callee, bool isTailCall = false) {
195 SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, Chain,
197 setNodeValueTypes(NN, RetVals);
198 AllNodes.push_back(NN);
201 /// getCall - Note that this destroys the vector of RetVals passed in.
203 SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
204 SDOperand Callee, SDOperand Flag, bool isTailCall = false) {
205 SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, Chain,
207 setNodeValueTypes(NN, RetVals);
208 AllNodes.push_back(NN);
212 /// getCall - This is identical to the one above, and should be used for calls
213 /// where arguments are passed in physical registers. This destroys the
214 /// RetVals and ArgsInRegs vectors.
215 SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
216 SDOperand Callee, std::vector<SDOperand> &ArgsInRegs,
217 bool isTailCall = false) {
218 ArgsInRegs.insert(ArgsInRegs.begin(), Callee);
219 ArgsInRegs.insert(ArgsInRegs.begin(), Chain);
220 SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, ArgsInRegs);
221 setNodeValueTypes(NN, RetVals);
222 AllNodes.push_back(NN);
226 SDOperand getCondCode(ISD::CondCode Cond);
228 /// getZeroExtendInReg - Return the expression required to zero extend the Op
229 /// value assuming it was the smaller SrcTy value.
230 SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
232 /// getNode - Gets or creates the specified node.
234 SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
235 SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
236 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
237 SDOperand N1, SDOperand N2);
238 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
239 SDOperand N1, SDOperand N2, SDOperand N3);
240 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
241 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
242 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
243 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
245 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
246 std::vector<SDOperand> &Children);
247 SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
248 std::vector<SDOperand> &Ops);
250 /// getSetCC - Helper function to make it easier to build SetCC's if you just
251 /// have an ISD::CondCode instead of an SDOperand.
253 SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
254 ISD::CondCode Cond) {
255 return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
258 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
259 /// just have an ISD::CondCode instead of an SDOperand.
261 SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
262 SDOperand True, SDOperand False, ISD::CondCode Cond) {
263 MVT::ValueType VT = True.getValueType();
264 return getNode(ISD::SELECT_CC, VT, LHS, RHS, True, False,getCondCode(Cond));
267 /// getBR2Way_CC - Helper function to make it easier to build BRTWOWAY_CC
270 SDOperand getBR2Way_CC(SDOperand Chain, SDOperand CCNode, SDOperand LHS,
271 SDOperand RHS, SDOperand True, SDOperand False) {
272 std::vector<SDOperand> Ops;
273 Ops.push_back(Chain);
274 Ops.push_back(CCNode);
278 Ops.push_back(False);
279 return getNode(ISD::BRTWOWAY_CC, MVT::Other, Ops);
282 /// getLoad - Loads are not normal binary operators: their result type is not
283 /// determined by their operands, and they produce a value AND a token chain.
285 SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
287 SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
288 SDOperand Ptr, SDOperand SV);
289 SDOperand getExtLoad(unsigned Opcode, MVT::ValueType VT, SDOperand Chain,
290 SDOperand Ptr, SDOperand SV, MVT::ValueType EVT);
292 // getSrcValue - construct a node to track a Value* through the backend
293 SDOperand getSrcValue(const Value* I, int offset = 0);
296 /// SelectNodeTo - These are used for target selectors to *mutate* the
297 /// specified node to have the specified return type, Target opcode, and
298 /// operands. Note that target opcodes are stored as
299 /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
300 /// of the resultant node is returned.
301 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
302 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
304 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
305 SDOperand Op1, SDOperand Op2);
306 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
307 SDOperand Op1, SDOperand Op2, SDOperand Op3);
308 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
309 SDOperand Op1, SDOperand Op2, SDOperand Op3,
311 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
312 SDOperand Op1, SDOperand Op2, SDOperand Op3,
313 SDOperand Op4, SDOperand Op5);
314 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
315 SDOperand Op1, SDOperand Op2, SDOperand Op3,
316 SDOperand Op4, SDOperand Op5, SDOperand Op6);
317 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
318 SDOperand Op1, SDOperand Op2, SDOperand Op3,
319 SDOperand Op4, SDOperand Op5, SDOperand Op6,
321 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
322 SDOperand Op1, SDOperand Op2, SDOperand Op3,
323 SDOperand Op4, SDOperand Op5, SDOperand Op6,
324 SDOperand Op7, SDOperand Op8);
325 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
326 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
327 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
328 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
330 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
331 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
332 SDOperand Op3, SDOperand Op4);
333 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
334 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
335 SDOperand Op3, SDOperand Op4, SDOperand Op5);
337 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT) {
338 return getNode(ISD::BUILTIN_OP_END+Opcode, VT);
340 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
342 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1);
344 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
345 SDOperand Op1, SDOperand Op2) {
346 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2);
348 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
349 SDOperand Op1, SDOperand Op2, SDOperand Op3) {
350 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3);
352 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
353 SDOperand Op1, SDOperand Op2, SDOperand Op3,
355 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3, Op4);
357 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
358 SDOperand Op1, SDOperand Op2, SDOperand Op3,
359 SDOperand Op4, SDOperand Op5) {
360 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3, Op4, Op5);
362 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
363 SDOperand Op1, SDOperand Op2, SDOperand Op3,
364 SDOperand Op4, SDOperand Op5, SDOperand Op6) {
365 std::vector<SDOperand> Ops;
373 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops);
375 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
376 SDOperand Op1, SDOperand Op2, SDOperand Op3,
377 SDOperand Op4, SDOperand Op5, SDOperand Op6,
379 std::vector<SDOperand> Ops;
388 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops);
390 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
391 SDOperand Op1, SDOperand Op2, SDOperand Op3,
392 SDOperand Op4, SDOperand Op5, SDOperand Op6,
393 SDOperand Op7, SDOperand Op8) {
394 std::vector<SDOperand> Ops;
404 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops);
406 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
407 std::vector<SDOperand> &Ops) {
408 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops);
410 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
411 MVT::ValueType VT2, SDOperand Op1) {
412 std::vector<MVT::ValueType> ResultTys;
413 ResultTys.push_back(VT1);
414 ResultTys.push_back(VT2);
415 std::vector<SDOperand> Ops;
417 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
419 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
420 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2) {
421 std::vector<MVT::ValueType> ResultTys;
422 ResultTys.push_back(VT1);
423 ResultTys.push_back(VT2);
424 std::vector<SDOperand> Ops;
427 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
429 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
430 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
432 std::vector<MVT::ValueType> ResultTys;
433 ResultTys.push_back(VT1);
434 ResultTys.push_back(VT2);
435 std::vector<SDOperand> Ops;
439 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
441 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
442 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
443 SDOperand Op3, SDOperand Op4) {
444 std::vector<MVT::ValueType> ResultTys;
445 ResultTys.push_back(VT1);
446 ResultTys.push_back(VT2);
447 std::vector<SDOperand> Ops;
452 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
454 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
455 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
456 SDOperand Op3, SDOperand Op4, SDOperand Op5) {
457 std::vector<MVT::ValueType> ResultTys;
458 ResultTys.push_back(VT1);
459 ResultTys.push_back(VT2);
460 std::vector<SDOperand> Ops;
466 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
468 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
469 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
470 SDOperand Op3, SDOperand Op4, SDOperand Op5,
472 std::vector<MVT::ValueType> ResultTys;
473 ResultTys.push_back(VT1);
474 ResultTys.push_back(VT2);
475 std::vector<SDOperand> Ops;
482 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
484 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
485 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
486 SDOperand Op3, SDOperand Op4, SDOperand Op5,
487 SDOperand Op6, SDOperand Op7) {
488 std::vector<MVT::ValueType> ResultTys;
489 ResultTys.push_back(VT1);
490 ResultTys.push_back(VT2);
491 std::vector<SDOperand> Ops;
499 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
501 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
502 MVT::ValueType VT2, MVT::ValueType VT3,
503 SDOperand Op1, SDOperand Op2) {
504 std::vector<MVT::ValueType> ResultTys;
505 ResultTys.push_back(VT1);
506 ResultTys.push_back(VT2);
507 ResultTys.push_back(VT3);
508 std::vector<SDOperand> Ops;
511 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
513 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
514 MVT::ValueType VT2, MVT::ValueType VT3,
515 SDOperand Op1, SDOperand Op2,
516 SDOperand Op3, SDOperand Op4, SDOperand Op5,
518 std::vector<MVT::ValueType> ResultTys;
519 ResultTys.push_back(VT1);
520 ResultTys.push_back(VT2);
521 ResultTys.push_back(VT3);
522 std::vector<SDOperand> Ops;
529 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
531 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
532 MVT::ValueType VT2, MVT::ValueType VT3,
533 SDOperand Op1, SDOperand Op2,
534 SDOperand Op3, SDOperand Op4, SDOperand Op5,
535 SDOperand Op6, SDOperand Op7) {
536 std::vector<MVT::ValueType> ResultTys;
537 ResultTys.push_back(VT1);
538 ResultTys.push_back(VT2);
539 ResultTys.push_back(VT3);
540 std::vector<SDOperand> Ops;
548 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
550 SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT1,
551 MVT::ValueType VT2, std::vector<SDOperand> &Ops) {
552 std::vector<MVT::ValueType> ResultTys;
553 ResultTys.push_back(VT1);
554 ResultTys.push_back(VT2);
555 return getNode(ISD::BUILTIN_OP_END+Opcode, ResultTys, Ops);
558 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
559 /// This can cause recursive merging of nodes in the DAG. Use the first
560 /// version if 'From' is known to have a single result, use the second
561 /// if you have two nodes with identical results, use the third otherwise.
563 /// These methods all take an optional vector, which (if not null) is
564 /// populated with any nodes that are deleted from the SelectionDAG, due to
565 /// new equivalences that are discovered.
567 void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
568 std::vector<SDNode*> *Deleted = 0);
569 void ReplaceAllUsesWith(SDNode *From, SDNode *To,
570 std::vector<SDNode*> *Deleted = 0);
571 void ReplaceAllUsesWith(SDNode *From, const std::vector<SDOperand> &To,
572 std::vector<SDNode*> *Deleted = 0);
575 /// DeleteNode - Remove the specified node from the system. This node must
576 /// have no referrers.
577 void DeleteNode(SDNode *N);
582 void RemoveNodeFromCSEMaps(SDNode *N);
583 SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
584 void DestroyDeadNode(SDNode *N);
585 void DeleteNodeNotInCSEMaps(SDNode *N);
586 void setNodeValueTypes(SDNode *N, std::vector<MVT::ValueType> &RetVals);
587 void setNodeValueTypes(SDNode *N, MVT::ValueType VT1, MVT::ValueType VT2);
590 /// SimplifySetCC - Try to simplify a setcc built with the specified operands
591 /// and cc. If unable to simplify it, return a null SDOperand.
592 SDOperand SimplifySetCC(MVT::ValueType VT, SDOperand N1,
593 SDOperand N2, ISD::CondCode Cond);
595 // List of non-single value types.
596 std::list<std::vector<MVT::ValueType> > VTList;
598 // Maps to auto-CSE operations.
599 std::map<std::pair<unsigned, MVT::ValueType>, SDNode *> NullaryOps;
600 std::map<std::pair<unsigned, std::pair<SDOperand, MVT::ValueType> >,
602 std::map<std::pair<unsigned, std::pair<SDOperand, SDOperand> >,
605 std::map<std::pair<unsigned, MVT::ValueType>, RegisterSDNode*> RegNodes;
606 std::vector<CondCodeSDNode*> CondCodeNodes;
608 std::map<std::pair<SDOperand, std::pair<SDOperand, MVT::ValueType> >,
611 std::map<std::pair<const GlobalValue*, int>, SDNode*> GlobalValues;
612 std::map<std::pair<const GlobalValue*, int>, SDNode*> TargetGlobalValues;
613 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
614 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstants;
615 std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> ConstantFPs;
616 std::map<int, SDNode*> FrameIndices, TargetFrameIndices;
617 std::map<Constant *, SDNode*> ConstantPoolIndices;
618 std::map<Constant *, SDNode*> TargetConstantPoolIndices;
619 std::map<MachineBasicBlock *, SDNode*> BBNodes;
620 std::vector<SDNode*> ValueTypeNodes;
621 std::map<std::string, SDNode*> ExternalSymbols;
622 std::map<std::string, SDNode*> TargetExternalSymbols;
623 std::map<std::string, StringSDNode*> StringNodes;
624 std::map<std::pair<unsigned,
625 std::pair<MVT::ValueType, std::vector<SDOperand> > >,
626 SDNode*> OneResultNodes;
627 std::map<std::pair<unsigned,
628 std::pair<std::vector<MVT::ValueType>,
629 std::vector<SDOperand> > >,
630 SDNode*> ArbitraryNodes;
633 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
634 typedef SelectionDAG::allnodes_iterator nodes_iterator;
635 static nodes_iterator nodes_begin(SelectionDAG *G) {
636 return G->allnodes_begin();
638 static nodes_iterator nodes_end(SelectionDAG *G) {
639 return G->allnodes_end();
643 } // end namespace llvm