SelectionDAG.h revision 6e1bb38fb8dd64ece28ea5779a8bbf9b5ff7fb96 
1//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// 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/ADT/ilist.h"
19#include "llvm/ADT/DenseSet.h"
20#include "llvm/ADT/FoldingSet.h"
21#include "llvm/ADT/StringMap.h"
22#include "llvm/CodeGen/SelectionDAGNodes.h"
23
24#include <cassert>
25#include <vector>
26#include <map>
27#include <string>
28
29namespace llvm {
30
31class AliasAnalysis;
32class TargetLowering;
33class TargetMachine;
34class MachineModuleInfo;
35class DwarfWriter;
36class MachineFunction;
37class MachineConstantPoolValue;
38class FunctionLoweringInfo;
39
40template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> {
41private:
42  mutable SDNode Sentinel;
43public:
44  ilist_traits() : Sentinel(ISD::DELETED_NODE, SDVTList()) {}
45
46  SDNode *createSentinel() const {
47    return &Sentinel;
48  }
49  static void destroySentinel(SDNode *) {}
50
51  static void deleteNode(SDNode *) {
52    assert(0 && "ilist_traits<SDNode> shouldn't see a deleteNode call!");
53  }
54private:
55  static void createNode(const SDNode &);
56};
57
58enum CombineLevel {
59  Unrestricted,   // Combine may create illegal operations and illegal types.
60  NoIllegalTypes, // Combine may create illegal operations but no illegal types.
61  NoIllegalOperations // Combine may only create legal operations and types.
62};
63
64/// SelectionDAG class - This is used to represent a portion of an LLVM function
65/// in a low-level Data Dependence DAG representation suitable for instruction
66/// selection.  This DAG is constructed as the first step of instruction
67/// selection in order to allow implementation of machine specific optimizations
68/// and code simplifications.
69///
70/// The representation used by the SelectionDAG is a target-independent
71/// representation, which has some similarities to the GCC RTL representation,
72/// but is significantly more simple, powerful, and is a graph form instead of a
73/// linear form.
74///
75class SelectionDAG {
76  TargetLowering &TLI;
77  MachineFunction *MF;
78  FunctionLoweringInfo &FLI;
79  MachineModuleInfo *MMI;
80  DwarfWriter *DW;
81
82  /// EntryNode - The starting token.
83  SDNode EntryNode;
84
85  /// Root - The root of the entire DAG.
86  SDValue Root;
87
88  /// AllNodes - A linked list of nodes in the current DAG.
89  ilist<SDNode> AllNodes;
90
91  /// NodeAllocatorType - The AllocatorType for allocating SDNodes. We use
92  /// pool allocation with recycling.
93  typedef RecyclingAllocator<BumpPtrAllocator, SDNode, sizeof(LargestSDNode),
94                             AlignOf<MostAlignedSDNode>::Alignment>
95    NodeAllocatorType;
96
97  /// NodeAllocator - Pool allocation for nodes.
98  NodeAllocatorType NodeAllocator;
99
100  /// CSEMap - This structure is used to memoize nodes, automatically performing
101  /// CSE with existing nodes with a duplicate is requested.
102  FoldingSet<SDNode> CSEMap;
103
104  /// OperandAllocator - Pool allocation for machine-opcode SDNode operands.
105  BumpPtrAllocator OperandAllocator;
106
107  /// Allocator - Pool allocation for misc. objects that are created once per
108  /// SelectionDAG.
109  BumpPtrAllocator Allocator;
110
111  /// VerifyNode - Sanity check the given node.  Aborts if it is invalid.
112  void VerifyNode(SDNode *N);
113
114  /// setGraphColorHelper - Implementation of setSubgraphColor.
115  /// Return whether we had to truncate the search.
116  ///
117  bool setSubgraphColorHelper(SDNode *N, const char *Color, DenseSet<SDNode *> &visited,
118                              int level, bool &printed);
119
120public:
121  SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli);
122  ~SelectionDAG();
123
124  /// init - Prepare this SelectionDAG to process code in the given
125  /// MachineFunction.
126  ///
127  void init(MachineFunction &mf, MachineModuleInfo *mmi, DwarfWriter *dw);
128
129  /// clear - Clear state and free memory necessary to make this
130  /// SelectionDAG ready to process a new block.
131  ///
132  void clear();
133
134  MachineFunction &getMachineFunction() const { return *MF; }
135  const TargetMachine &getTarget() const;
136  TargetLowering &getTargetLoweringInfo() const { return TLI; }
137  FunctionLoweringInfo &getFunctionLoweringInfo() const { return FLI; }
138  MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
139  DwarfWriter *getDwarfWriter() const { return DW; }
140
141  /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
142  ///
143  void viewGraph(const std::string &Title);
144  void viewGraph();
145
146#ifndef NDEBUG
147  std::map<const SDNode *, std::string> NodeGraphAttrs;
148#endif
149
150  /// clearGraphAttrs - Clear all previously defined node graph attributes.
151  /// Intended to be used from a debugging tool (eg. gdb).
152  void clearGraphAttrs();
153
154  /// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
155  ///
156  void setGraphAttrs(const SDNode *N, const char *Attrs);
157
158  /// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
159  /// Used from getNodeAttributes.
160  const std::string getGraphAttrs(const SDNode *N) const;
161
162  /// setGraphColor - Convenience for setting node color attribute.
163  ///
164  void setGraphColor(const SDNode *N, const char *Color);
165
166  /// setGraphColor - Convenience for setting subgraph color attribute.
167  ///
168  void setSubgraphColor(SDNode *N, const char *Color);
169
170  typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
171  allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
172  allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
173  typedef ilist<SDNode>::iterator allnodes_iterator;
174  allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
175  allnodes_iterator allnodes_end() { return AllNodes.end(); }
176  ilist<SDNode>::size_type allnodes_size() const {
177    return AllNodes.size();
178  }
179
180  /// getRoot - Return the root tag of the SelectionDAG.
181  ///
182  const SDValue &getRoot() const { return Root; }
183
184  /// getEntryNode - Return the token chain corresponding to the entry of the
185  /// function.
186  SDValue getEntryNode() const {
187    return SDValue(const_cast<SDNode *>(&EntryNode), 0);
188  }
189
190  /// setRoot - Set the current root tag of the SelectionDAG.
191  ///
192  const SDValue &setRoot(SDValue N) {
193    assert((!N.getNode() || N.getValueType() == MVT::Other) &&
194           "DAG root value is not a chain!");
195    return Root = N;
196  }
197
198  /// Combine - This iterates over the nodes in the SelectionDAG, folding
199  /// certain types of nodes together, or eliminating superfluous nodes.  The
200  /// Level argument controls whether Combine is allowed to produce nodes and
201  /// types that are illegal on the target.
202  void Combine(CombineLevel Level, AliasAnalysis &AA, bool Fast);
203
204  /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
205  /// only uses types natively supported by the target.  Returns "true" if it
206  /// made any changes.
207  ///
208  /// Note that this is an involved process that may invalidate pointers into
209  /// the graph.
210  bool LegalizeTypes();
211
212  /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
213  /// compatible with the target instruction selector, as indicated by the
214  /// TargetLowering object.
215  ///
216  /// Note that this is an involved process that may invalidate pointers into
217  /// the graph.
218  void Legalize(bool TypesNeedLegalizing);
219
220  /// RemoveDeadNodes - This method deletes all unreachable nodes in the
221  /// SelectionDAG.
222  void RemoveDeadNodes();
223
224  /// DeleteNode - Remove the specified node from the system.  This node must
225  /// have no referrers.
226  void DeleteNode(SDNode *N);
227
228  /// getVTList - Return an SDVTList that represents the list of values
229  /// specified.
230  SDVTList getVTList(MVT VT);
231  SDVTList getVTList(MVT VT1, MVT VT2);
232  SDVTList getVTList(MVT VT1, MVT VT2, MVT VT3);
233  SDVTList getVTList(MVT VT1, MVT VT2, MVT VT3, MVT VT4);
234  SDVTList getVTList(const MVT *VTs, unsigned NumVTs);
235
236  /// getNodeValueTypes - These are obsolete, use getVTList instead.
237  const MVT *getNodeValueTypes(MVT VT) {
238    return getVTList(VT).VTs;
239  }
240  const MVT *getNodeValueTypes(MVT VT1, MVT VT2) {
241    return getVTList(VT1, VT2).VTs;
242  }
243  const MVT *getNodeValueTypes(MVT VT1, MVT VT2, MVT VT3) {
244    return getVTList(VT1, VT2, VT3).VTs;
245  }
246  const MVT *getNodeValueTypes(MVT VT1, MVT VT2, MVT VT3, MVT VT4) {
247    return getVTList(VT1, VT2, VT3, VT4).VTs;
248  }
249  const MVT *getNodeValueTypes(const std::vector<MVT> &vtList) {
250    return getVTList(&vtList[0], (unsigned)vtList.size()).VTs;
251  }
252
253
254  //===--------------------------------------------------------------------===//
255  // Node creation methods.
256  //
257  SDValue getConstant(uint64_t Val, MVT VT, bool isTarget = false);
258  SDValue getConstant(const APInt &Val, MVT VT, bool isTarget = false);
259  SDValue getConstant(const ConstantInt &Val, MVT VT, bool isTarget = false);
260  SDValue getIntPtrConstant(uint64_t Val, bool isTarget = false);
261  SDValue getTargetConstant(uint64_t Val, MVT VT) {
262    return getConstant(Val, VT, true);
263  }
264  SDValue getTargetConstant(const APInt &Val, MVT VT) {
265    return getConstant(Val, VT, true);
266  }
267  SDValue getTargetConstant(const ConstantInt &Val, MVT VT) {
268    return getConstant(Val, VT, true);
269  }
270  SDValue getConstantFP(double Val, MVT VT, bool isTarget = false);
271  SDValue getConstantFP(const APFloat& Val, MVT VT, bool isTarget = false);
272  SDValue getConstantFP(const ConstantFP &CF, MVT VT, bool isTarget = false);
273  SDValue getTargetConstantFP(double Val, MVT VT) {
274    return getConstantFP(Val, VT, true);
275  }
276  SDValue getTargetConstantFP(const APFloat& Val, MVT VT) {
277    return getConstantFP(Val, VT, true);
278  }
279  SDValue getTargetConstantFP(const ConstantFP &Val, MVT VT) {
280    return getConstantFP(Val, VT, true);
281  }
282  SDValue getGlobalAddress(const GlobalValue *GV, MVT VT,
283                           int64_t offset = 0, bool isTargetGA = false);
284  SDValue getTargetGlobalAddress(const GlobalValue *GV, MVT VT,
285                                 int64_t offset = 0) {
286    return getGlobalAddress(GV, VT, offset, true);
287  }
288  SDValue getFrameIndex(int FI, MVT VT, bool isTarget = false);
289  SDValue getTargetFrameIndex(int FI, MVT VT) {
290    return getFrameIndex(FI, VT, true);
291  }
292  SDValue getJumpTable(int JTI, MVT VT, bool isTarget = false);
293  SDValue getTargetJumpTable(int JTI, MVT VT) {
294    return getJumpTable(JTI, VT, true);
295  }
296  SDValue getConstantPool(Constant *C, MVT VT,
297                            unsigned Align = 0, int Offs = 0, bool isT=false);
298  SDValue getTargetConstantPool(Constant *C, MVT VT,
299                                  unsigned Align = 0, int Offset = 0) {
300    return getConstantPool(C, VT, Align, Offset, true);
301  }
302  SDValue getConstantPool(MachineConstantPoolValue *C, MVT VT,
303                            unsigned Align = 0, int Offs = 0, bool isT=false);
304  SDValue getTargetConstantPool(MachineConstantPoolValue *C,
305                                  MVT VT, unsigned Align = 0,
306                                  int Offset = 0) {
307    return getConstantPool(C, VT, Align, Offset, true);
308  }
309  SDValue getBasicBlock(MachineBasicBlock *MBB);
310  SDValue getBasicBlock(MachineBasicBlock *MBB, DebugLoc dl);
311  SDValue getExternalSymbol(const char *Sym, MVT VT);
312  SDValue getExternalSymbol(const char *Sym, DebugLoc dl, MVT VT);
313  SDValue getTargetExternalSymbol(const char *Sym, MVT VT);
314  SDValue getTargetExternalSymbol(const char *Sym, DebugLoc dl, MVT VT);
315  SDValue getArgFlags(ISD::ArgFlagsTy Flags);
316  SDValue getValueType(MVT);
317  SDValue getRegister(unsigned Reg, MVT VT);
318  SDValue getDbgStopPoint(SDValue Root, unsigned Line, unsigned Col,
319                          Value *CU);
320  SDValue getLabel(unsigned Opcode, SDValue Root, unsigned LabelID);
321  SDValue getLabel(unsigned Opcode, DebugLoc dl, SDValue Root,
322                   unsigned LabelID);
323
324  SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N) {
325    return getNode(ISD::CopyToReg, MVT::Other, Chain,
326                   getRegister(Reg, N.getValueType()), N);
327  }
328
329  // This version of the getCopyToReg method takes an extra operand, which
330  // indicates that there is potentially an incoming flag value (if Flag is not
331  // null) and that there should be a flag result.
332  SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N,
333                         SDValue Flag) {
334    const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
335    SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
336    return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3);
337  }
338
339  // Similar to last getCopyToReg() except parameter Reg is a SDValue
340  SDValue getCopyToReg(SDValue Chain, SDValue Reg, SDValue N,
341                         SDValue Flag) {
342    const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
343    SDValue Ops[] = { Chain, Reg, N, Flag };
344    return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3);
345  }
346
347  SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT) {
348    const MVT *VTs = getNodeValueTypes(VT, MVT::Other);
349    SDValue Ops[] = { Chain, getRegister(Reg, VT) };
350    return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2);
351  }
352
353  // This version of the getCopyFromReg method takes an extra operand, which
354  // indicates that there is potentially an incoming flag value (if Flag is not
355  // null) and that there should be a flag result.
356  SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT,
357                           SDValue Flag) {
358    const MVT *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag);
359    SDValue Ops[] = { Chain, getRegister(Reg, VT), Flag };
360    return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.getNode() ? 3 : 2);
361  }
362
363  SDValue getCondCode(ISD::CondCode Cond);
364
365  /// Returns the ConvertRndSat Note: Avoid using this node because it may
366  /// disappear in the future and most targets don't support it.
367  SDValue getConvertRndSat(MVT VT, SDValue Val, SDValue DTy, SDValue STy,
368                           SDValue Rnd, SDValue Sat, ISD::CvtCode Code);
369
370  /// getZeroExtendInReg - Return the expression required to zero extend the Op
371  /// value assuming it was the smaller SrcTy value.
372  SDValue getZeroExtendInReg(SDValue Op, MVT SrcTy);
373
374  /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
375  SDValue getNOT(SDValue Val, MVT VT);
376
377  /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
378  /// a flag result (to ensure it's not CSE'd).
379  SDValue getCALLSEQ_START(SDValue Chain, SDValue Op) {
380    const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
381    SDValue Ops[] = { Chain,  Op };
382    return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2);
383  }
384
385  /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
386  /// flag result (to ensure it's not CSE'd).
387  SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2,
388                           SDValue InFlag) {
389    SDVTList NodeTys = getVTList(MVT::Other, MVT::Flag);
390    SmallVector<SDValue, 4> Ops;
391    Ops.push_back(Chain);
392    Ops.push_back(Op1);
393    Ops.push_back(Op2);
394    Ops.push_back(InFlag);
395    return getNode(ISD::CALLSEQ_END, NodeTys, &Ops[0],
396                   (unsigned)Ops.size() - (InFlag.getNode() == 0 ? 1 : 0));
397  }
398
399  /// getNode - Gets or creates the specified node.
400  ///
401  SDValue getNode(unsigned Opcode, MVT VT);
402  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT);
403  SDValue getNode(unsigned Opcode, MVT VT, SDValue N);
404  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N);
405  SDValue getNode(unsigned Opcode, MVT VT, SDValue N1, SDValue N2);
406  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N1, SDValue N2);
407  SDValue getNode(unsigned Opcode, MVT VT,
408                  SDValue N1, SDValue N2, SDValue N3);
409  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT,
410                  SDValue N1, SDValue N2, SDValue N3);
411  SDValue getNode(unsigned Opcode, MVT VT,
412                  SDValue N1, SDValue N2, SDValue N3, SDValue N4);
413  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT,
414                  SDValue N1, SDValue N2, SDValue N3, SDValue N4);
415  SDValue getNode(unsigned Opcode, MVT VT,
416                  SDValue N1, SDValue N2, SDValue N3, SDValue N4,
417                  SDValue N5);
418  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT,
419                  SDValue N1, SDValue N2, SDValue N3, SDValue N4,
420                  SDValue N5);
421  SDValue getNode(unsigned Opcode, MVT VT,
422                  const SDUse *Ops, unsigned NumOps);
423  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT,
424                  const SDUse *Ops, unsigned NumOps);
425  SDValue getNode(unsigned Opcode, MVT VT,
426                  const SDValue *Ops, unsigned NumOps);
427  SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT,
428                  const SDValue *Ops, unsigned NumOps);
429  SDValue getNode(unsigned Opcode, const std::vector<MVT> &ResultTys,
430                  const SDValue *Ops, unsigned NumOps);
431  SDValue getNode(unsigned Opcode, DebugLoc DL,
432                  const std::vector<MVT> &ResultTys,
433                  const SDValue *Ops, unsigned NumOps);
434  SDValue getNode(unsigned Opcode, const MVT *VTs, unsigned NumVTs,
435                  const SDValue *Ops, unsigned NumOps);
436  SDValue getNode(unsigned Opcode, DebugLoc DL, const MVT *VTs, unsigned NumVTs,
437                  const SDValue *Ops, unsigned NumOps);
438  SDValue getNode(unsigned Opcode, SDVTList VTs,
439                  const SDValue *Ops, unsigned NumOps);
440  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
441                  const SDValue *Ops, unsigned NumOps);
442
443  SDValue getNode(unsigned Opcode, SDVTList VTs);
444  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs);
445  SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N);
446  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, SDValue N);
447  SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N1, SDValue N2);
448  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
449                  SDValue N1, SDValue N2);
450  SDValue getNode(unsigned Opcode, SDVTList VTs,
451                  SDValue N1, SDValue N2, SDValue N3);
452  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
453                  SDValue N1, SDValue N2, SDValue N3);
454  SDValue getNode(unsigned Opcode, SDVTList VTs,
455                  SDValue N1, SDValue N2, SDValue N3, SDValue N4);
456  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
457                  SDValue N1, SDValue N2, SDValue N3, SDValue N4);
458  SDValue getNode(unsigned Opcode, SDVTList VTs,
459                  SDValue N1, SDValue N2, SDValue N3, SDValue N4,
460                  SDValue N5);
461  SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
462                  SDValue N1, SDValue N2, SDValue N3, SDValue N4,
463                  SDValue N5);
464
465  SDValue getMemcpy(SDValue Chain, SDValue Dst, SDValue Src,
466                    SDValue Size, unsigned Align, bool AlwaysInline,
467                    const Value *DstSV, uint64_t DstSVOff,
468                    const Value *SrcSV, uint64_t SrcSVOff);
469
470  SDValue getMemmove(SDValue Chain, SDValue Dst, SDValue Src,
471                     SDValue Size, unsigned Align,
472                     const Value *DstSV, uint64_t DstOSVff,
473                     const Value *SrcSV, uint64_t SrcSVOff);
474
475  SDValue getMemset(SDValue Chain, SDValue Dst, SDValue Src,
476                    SDValue Size, unsigned Align,
477                    const Value *DstSV, uint64_t DstSVOff);
478
479  /// getSetCC - Helper function to make it easier to build SetCC's if you just
480  /// have an ISD::CondCode instead of an SDValue.
481  ///
482  SDValue getSetCC(MVT VT, SDValue LHS, SDValue RHS,
483                   ISD::CondCode Cond) {
484    return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
485  }
486
487  /// getVSetCC - Helper function to make it easier to build VSetCC's nodes
488  /// if you just have an ISD::CondCode instead of an SDValue.
489  ///
490  SDValue getVSetCC(MVT VT, SDValue LHS, SDValue RHS,
491                    ISD::CondCode Cond) {
492    return getNode(ISD::VSETCC, VT, LHS, RHS, getCondCode(Cond));
493  }
494
495  /// getSelectCC - Helper function to make it easier to build SelectCC's if you
496  /// just have an ISD::CondCode instead of an SDValue.
497  ///
498  SDValue getSelectCC(SDValue LHS, SDValue RHS,
499                      SDValue True, SDValue False, ISD::CondCode Cond) {
500    return getNode(ISD::SELECT_CC, True.getValueType(), LHS, RHS, True, False,
501                   getCondCode(Cond));
502  }
503
504  /// getVAArg - VAArg produces a result and token chain, and takes a pointer
505  /// and a source value as input.
506  SDValue getVAArg(MVT VT, SDValue Chain, SDValue Ptr,
507                   SDValue SV);
508
509  /// getAtomic - Gets a node for an atomic op, produces result and chain and
510  /// takes 3 operands
511  SDValue getAtomic(unsigned Opcode, MVT MemVT, SDValue Chain, SDValue Ptr,
512                    SDValue Cmp, SDValue Swp, const Value* PtrVal,
513                    unsigned Alignment=0);
514  SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain,
515                    SDValue Ptr, SDValue Cmp, SDValue Swp, const Value* PtrVal,
516                    unsigned Alignment=0);
517
518  /// getAtomic - Gets a node for an atomic op, produces result and chain and
519  /// takes 2 operands.
520  SDValue getAtomic(unsigned Opcode, MVT MemVT, SDValue Chain, SDValue Ptr,
521                    SDValue Val, const Value* PtrVal,
522                    unsigned Alignment = 0);
523  SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain,
524                    SDValue Ptr, SDValue Val, const Value* PtrVal,
525                    unsigned Alignment = 0);
526
527  /// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a
528  /// result and takes a list of operands.
529  SDValue getMemIntrinsicNode(unsigned Opcode,
530                              const MVT *VTs, unsigned NumVTs,
531                              const SDValue *Ops, unsigned NumOps,
532                              MVT MemVT, const Value *srcValue, int SVOff,
533                              unsigned Align = 0, bool Vol = false,
534                              bool ReadMem = true, bool WriteMem = true);
535  SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
536                              const MVT *VTs, unsigned NumVTs,
537                              const SDValue *Ops, unsigned NumOps,
538                              MVT MemVT, const Value *srcValue, int SVOff,
539                              unsigned Align = 0, bool Vol = false,
540                              bool ReadMem = true, bool WriteMem = true);
541
542  SDValue getMemIntrinsicNode(unsigned Opcode, SDVTList VTList,
543                              const SDValue *Ops, unsigned NumOps,
544                              MVT MemVT, const Value *srcValue, int SVOff,
545                              unsigned Align = 0, bool Vol = false,
546                              bool ReadMem = true, bool WriteMem = true);
547  SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
548                              const SDValue *Ops, unsigned NumOps,
549                              MVT MemVT, const Value *srcValue, int SVOff,
550                              unsigned Align = 0, bool Vol = false,
551                              bool ReadMem = true, bool WriteMem = true);
552
553  /// getMergeValues - Create a MERGE_VALUES node from the given operands.
554  SDValue getMergeValues(const SDValue *Ops, unsigned NumOps);
555
556  /// getCall - Create a CALL node from the given information.
557  ///
558  SDValue getCall(unsigned CallingConv, bool IsVarArgs, bool IsTailCall,
559                  bool isInreg, SDVTList VTs, const SDValue *Operands,
560                  unsigned NumOperands);
561  SDValue getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs,
562                  bool IsTailCall, bool isInreg, SDVTList VTs,
563                  const SDValue *Operands, unsigned NumOperands);
564
565  /// getLoad - Loads are not normal binary operators: their result type is not
566  /// determined by their operands, and they produce a value AND a token chain.
567  ///
568  SDValue getLoad(MVT VT, SDValue Chain, SDValue Ptr,
569                    const Value *SV, int SVOffset, bool isVolatile=false,
570                    unsigned Alignment=0);
571  SDValue getLoad(MVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr,
572                    const Value *SV, int SVOffset, bool isVolatile=false,
573                    unsigned Alignment=0);
574  SDValue getExtLoad(ISD::LoadExtType ExtType, MVT VT,
575                       SDValue Chain, SDValue Ptr, const Value *SV,
576                       int SVOffset, MVT EVT, bool isVolatile=false,
577                       unsigned Alignment=0);
578  SDValue getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, MVT VT,
579                       SDValue Chain, SDValue Ptr, const Value *SV,
580                       int SVOffset, MVT EVT, bool isVolatile=false,
581                       unsigned Alignment=0);
582  SDValue getIndexedLoad(SDValue OrigLoad, SDValue Base,
583                           SDValue Offset, ISD::MemIndexedMode AM);
584  SDValue getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
585                           SDValue Offset, ISD::MemIndexedMode AM);
586  SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
587                    MVT VT, SDValue Chain,
588                    SDValue Ptr, SDValue Offset,
589                    const Value *SV, int SVOffset, MVT EVT,
590                    bool isVolatile=false, unsigned Alignment=0);
591  SDValue getLoad(ISD::MemIndexedMode AM, DebugLoc dl, ISD::LoadExtType ExtType,
592                    MVT VT, SDValue Chain,
593                    SDValue Ptr, SDValue Offset,
594                    const Value *SV, int SVOffset, MVT EVT,
595                    bool isVolatile=false, unsigned Alignment=0);
596
597  /// getStore - Helper function to build ISD::STORE nodes.
598  ///
599  SDValue getStore(SDValue Chain, SDValue Val, SDValue Ptr,
600                     const Value *SV, int SVOffset, bool isVolatile=false,
601                     unsigned Alignment=0);
602  SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
603                     const Value *SV, int SVOffset, bool isVolatile=false,
604                     unsigned Alignment=0);
605  SDValue getTruncStore(SDValue Chain, SDValue Val, SDValue Ptr,
606                          const Value *SV, int SVOffset, MVT TVT,
607                          bool isVolatile=false, unsigned Alignment=0);
608  SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
609                          const Value *SV, int SVOffset, MVT TVT,
610                          bool isVolatile=false, unsigned Alignment=0);
611  SDValue getIndexedStore(SDValue OrigStoe, SDValue Base,
612                           SDValue Offset, ISD::MemIndexedMode AM);
613  SDValue getIndexedStore(SDValue OrigStoe, DebugLoc dl, SDValue Base,
614                           SDValue Offset, ISD::MemIndexedMode AM);
615
616  /// getSrcValue - Construct a node to track a Value* through the backend.
617  SDValue getSrcValue(const Value *v);
618
619  /// getMemOperand - Construct a node to track a memory reference
620  /// through the backend.
621  SDValue getMemOperand(const MachineMemOperand &MO);
622
623  /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
624  /// specified operands.  If the resultant node already exists in the DAG,
625  /// this does not modify the specified node, instead it returns the node that
626  /// already exists.  If the resultant node does not exist in the DAG, the
627  /// input node is returned.  As a degenerate case, if you specify the same
628  /// input operands as the node already has, the input node is returned.
629  SDValue UpdateNodeOperands(SDValue N, SDValue Op);
630  SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2);
631  SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
632                               SDValue Op3);
633  SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
634                               SDValue Op3, SDValue Op4);
635  SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
636                               SDValue Op3, SDValue Op4, SDValue Op5);
637  SDValue UpdateNodeOperands(SDValue N,
638                               const SDValue *Ops, unsigned NumOps);
639
640  /// SelectNodeTo - These are used for target selectors to *mutate* the
641  /// specified node to have the specified return type, Target opcode, and
642  /// operands.  Note that target opcodes are stored as
643  /// ~TargetOpcode in the node opcode field.  The resultant node is returned.
644  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT);
645  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, SDValue Op1);
646  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT,
647                       SDValue Op1, SDValue Op2);
648  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT,
649                       SDValue Op1, SDValue Op2, SDValue Op3);
650  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT,
651                       const SDValue *Ops, unsigned NumOps);
652  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, MVT VT2);
653  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
654                       MVT VT2, const SDValue *Ops, unsigned NumOps);
655  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
656                       MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps);
657  SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, MVT VT1,
658                       MVT VT2, MVT VT3, MVT VT4, const SDValue *Ops,
659                       unsigned NumOps);
660  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
661                       MVT VT2, SDValue Op1);
662  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
663                       MVT VT2, SDValue Op1, SDValue Op2);
664  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
665                       MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
666  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1,
667                       MVT VT2, MVT VT3, SDValue Op1, SDValue Op2, SDValue Op3);
668  SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs,
669                       const SDValue *Ops, unsigned NumOps);
670
671  /// MorphNodeTo - These *mutate* the specified node to have the specified
672  /// return type, opcode, and operands.
673  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT);
674  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, SDValue Op1);
675  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT,
676                      SDValue Op1, SDValue Op2);
677  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT,
678                      SDValue Op1, SDValue Op2, SDValue Op3);
679  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT,
680                      const SDValue *Ops, unsigned NumOps);
681  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, MVT VT2);
682  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1,
683                      MVT VT2, const SDValue *Ops, unsigned NumOps);
684  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1,
685                      MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps);
686  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1,
687                      MVT VT2, SDValue Op1);
688  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1,
689                      MVT VT2, SDValue Op1, SDValue Op2);
690  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1,
691                      MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
692  SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs,
693                      const SDValue *Ops, unsigned NumOps);
694
695  /// getTargetNode - These are used for target selectors to create a new node
696  /// with specified return type(s), target opcode, and operands.
697  ///
698  /// Note that getTargetNode returns the resultant node.  If there is already a
699  /// node of the specified opcode and operands, it returns that node instead of
700  /// the current one.
701  SDNode *getTargetNode(unsigned Opcode, MVT VT);
702  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT);
703  SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1);
704  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue Op1);
705  SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1, SDValue Op2);
706  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT,
707                        SDValue Op1, SDValue Op2);
708  SDNode *getTargetNode(unsigned Opcode, MVT VT,
709                        SDValue Op1, SDValue Op2, SDValue Op3);
710  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT,
711                        SDValue Op1, SDValue Op2, SDValue Op3);
712  SDNode *getTargetNode(unsigned Opcode, MVT VT,
713                        const SDValue *Ops, unsigned NumOps);
714  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT,
715                        const SDValue *Ops, unsigned NumOps);
716  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2);
717  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1, MVT VT2);
718  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, SDValue Op1);
719  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1,
720                        MVT VT2, SDValue Op1);
721  SDNode *getTargetNode(unsigned Opcode, MVT VT1,
722                        MVT VT2, SDValue Op1, SDValue Op2);
723  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1,
724                        MVT VT2, SDValue Op1, SDValue Op2);
725  SDNode *getTargetNode(unsigned Opcode, MVT VT1,
726                        MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
727  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1,
728                        MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
729  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2,
730                        const SDValue *Ops, unsigned NumOps);
731  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1, MVT VT2,
732                        const SDValue *Ops, unsigned NumOps);
733  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
734                        SDValue Op1, SDValue Op2);
735  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL,
736                        MVT VT1, MVT VT2, MVT VT3,
737                        SDValue Op1, SDValue Op2);
738  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
739                        SDValue Op1, SDValue Op2, SDValue Op3);
740  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1, MVT VT2, MVT VT3,
741                        SDValue Op1, SDValue Op2, SDValue Op3);
742  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
743                        const SDValue *Ops, unsigned NumOps);
744  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL, MVT VT1, MVT VT2, MVT VT3,
745                        const SDValue *Ops, unsigned NumOps);
746  SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, MVT VT4,
747                        const SDValue *Ops, unsigned NumOps);
748  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL,
749                        MVT VT1, MVT VT2, MVT VT3, MVT VT4,
750                        const SDValue *Ops, unsigned NumOps);
751  SDNode *getTargetNode(unsigned Opcode, const std::vector<MVT> &ResultTys,
752                        const SDValue *Ops, unsigned NumOps);
753  SDNode *getTargetNode(unsigned Opcode, DebugLoc DL,
754                        const std::vector<MVT> &ResultTys,
755                        const SDValue *Ops, unsigned NumOps);
756
757  /// getNodeIfExists - Get the specified node if it's already available, or
758  /// else return NULL.
759  SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs,
760                          const SDValue *Ops, unsigned NumOps);
761
762  /// DAGUpdateListener - Clients of various APIs that cause global effects on
763  /// the DAG can optionally implement this interface.  This allows the clients
764  /// to handle the various sorts of updates that happen.
765  class DAGUpdateListener {
766  public:
767    virtual ~DAGUpdateListener();
768
769    /// NodeDeleted - The node N that was deleted and, if E is not null, an
770    /// equivalent node E that replaced it.
771    virtual void NodeDeleted(SDNode *N, SDNode *E) = 0;
772
773    /// NodeUpdated - The node N that was updated.
774    virtual void NodeUpdated(SDNode *N) = 0;
775  };
776
777  /// RemoveDeadNode - Remove the specified node from the system. If any of its
778  /// operands then becomes dead, remove them as well. Inform UpdateListener
779  /// for each node deleted.
780  void RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener = 0);
781
782  /// RemoveDeadNodes - This method deletes the unreachable nodes in the
783  /// given list, and any nodes that become unreachable as a result.
784  void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
785                       DAGUpdateListener *UpdateListener = 0);
786
787  /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
788  /// This can cause recursive merging of nodes in the DAG.  Use the first
789  /// version if 'From' is known to have a single result, use the second
790  /// if you have two nodes with identical results, use the third otherwise.
791  ///
792  /// These methods all take an optional UpdateListener, which (if not null) is
793  /// informed about nodes that are deleted and modified due to recursive
794  /// changes in the dag.
795  ///
796  /// These functions only replace all existing uses. It's possible that as
797  /// these replacements are being performed, CSE may cause the From node
798  /// to be given new uses. These new uses of From are left in place, and
799  /// not automatically transfered to To.
800  ///
801  void ReplaceAllUsesWith(SDValue From, SDValue Op,
802                          DAGUpdateListener *UpdateListener = 0);
803  void ReplaceAllUsesWith(SDNode *From, SDNode *To,
804                          DAGUpdateListener *UpdateListener = 0);
805  void ReplaceAllUsesWith(SDNode *From, const SDValue *To,
806                          DAGUpdateListener *UpdateListener = 0);
807
808  /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
809  /// uses of other values produced by From.Val alone.
810  void ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
811                                 DAGUpdateListener *UpdateListener = 0);
812
813  /// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but
814  /// for multiple values at once. This correctly handles the case where
815  /// there is an overlap between the From values and the To values.
816  void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To,
817                                  unsigned Num,
818                                  DAGUpdateListener *UpdateListener = 0);
819
820  /// AssignTopologicalOrder - Topological-sort the AllNodes list and a
821  /// assign a unique node id for each node in the DAG based on their
822  /// topological order. Returns the number of nodes.
823  unsigned AssignTopologicalOrder();
824
825  /// RepositionNode - Move node N in the AllNodes list to be immediately
826  /// before the given iterator Position. This may be used to update the
827  /// topological ordering when the list of nodes is modified.
828  void RepositionNode(allnodes_iterator Position, SDNode *N) {
829    AllNodes.insert(Position, AllNodes.remove(N));
830  }
831
832  /// isCommutativeBinOp - Returns true if the opcode is a commutative binary
833  /// operation.
834  static bool isCommutativeBinOp(unsigned Opcode) {
835    // FIXME: This should get its info from the td file, so that we can include
836    // target info.
837    switch (Opcode) {
838    case ISD::ADD:
839    case ISD::MUL:
840    case ISD::MULHU:
841    case ISD::MULHS:
842    case ISD::SMUL_LOHI:
843    case ISD::UMUL_LOHI:
844    case ISD::FADD:
845    case ISD::FMUL:
846    case ISD::AND:
847    case ISD::OR:
848    case ISD::XOR:
849    case ISD::ADDC:
850    case ISD::ADDE: return true;
851    default: return false;
852    }
853  }
854
855  void dump() const;
856
857  /// CreateStackTemporary - Create a stack temporary, suitable for holding the
858  /// specified value type.  If minAlign is specified, the slot size will have
859  /// at least that alignment.
860  SDValue CreateStackTemporary(MVT VT, unsigned minAlign = 1);
861
862  /// CreateStackTemporary - Create a stack temporary suitable for holding
863  /// either of the specified value types.
864  SDValue CreateStackTemporary(MVT VT1, MVT VT2);
865
866  /// FoldConstantArithmetic -
867  SDValue FoldConstantArithmetic(unsigned Opcode,
868                                 MVT VT,
869                                 ConstantSDNode *Cst1,
870                                 ConstantSDNode *Cst2);
871
872  /// FoldSetCC - Constant fold a setcc to true or false.
873  SDValue FoldSetCC(MVT VT, SDValue N1,
874                    SDValue N2, ISD::CondCode Cond);
875
876  /// SignBitIsZero - Return true if the sign bit of Op is known to be zero.  We
877  /// use this predicate to simplify operations downstream.
878  bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const;
879
880  /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero.  We
881  /// use this predicate to simplify operations downstream.  Op and Mask are
882  /// known to be the same type.
883  bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0)
884    const;
885
886  /// ComputeMaskedBits - Determine which of the bits specified in Mask are
887  /// known to be either zero or one and return them in the KnownZero/KnownOne
888  /// bitsets.  This code only analyzes bits in Mask, in order to short-circuit
889  /// processing.  Targets can implement the computeMaskedBitsForTargetNode
890  /// method in the TargetLowering class to allow target nodes to be understood.
891  void ComputeMaskedBits(SDValue Op, const APInt &Mask, APInt &KnownZero,
892                         APInt &KnownOne, unsigned Depth = 0) const;
893
894  /// ComputeNumSignBits - Return the number of times the sign bit of the
895  /// register is replicated into the other bits.  We know that at least 1 bit
896  /// is always equal to the sign bit (itself), but other cases can give us
897  /// information.  For example, immediately after an "SRA X, 2", we know that
898  /// the top 3 bits are all equal to each other, so we return 3.  Targets can
899  /// implement the ComputeNumSignBitsForTarget method in the TargetLowering
900  /// class to allow target nodes to be understood.
901  unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const;
902
903  /// isVerifiedDebugInfoDesc - Returns true if the specified SDValue has
904  /// been verified as a debug information descriptor.
905  bool isVerifiedDebugInfoDesc(SDValue Op) const;
906
907  /// getShuffleScalarElt - Returns the scalar element that will make up the ith
908  /// element of the result of the vector shuffle.
909  SDValue getShuffleScalarElt(const SDNode *N, unsigned Idx);
910
911private:
912  bool RemoveNodeFromCSEMaps(SDNode *N);
913  void AddModifiedNodeToCSEMaps(SDNode *N, DAGUpdateListener *UpdateListener);
914  SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos);
915  SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2,
916                               void *&InsertPos);
917  SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps,
918                               void *&InsertPos);
919
920  void DeleteNodeNotInCSEMaps(SDNode *N);
921  void DeallocateNode(SDNode *N);
922
923  unsigned getMVTAlignment(MVT MemoryVT) const;
924
925  void allnodes_clear();
926
927  /// VTList - List of non-single value types.
928  std::vector<SDVTList> VTList;
929
930  /// CondCodeNodes - Maps to auto-CSE operations.
931  std::vector<CondCodeSDNode*> CondCodeNodes;
932
933  std::vector<SDNode*> ValueTypeNodes;
934  std::map<MVT, SDNode*, MVT::compareRawBits> ExtendedValueTypeNodes;
935  StringMap<SDNode*> ExternalSymbols;
936  StringMap<SDNode*> TargetExternalSymbols;
937};
938
939template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
940  typedef SelectionDAG::allnodes_iterator nodes_iterator;
941  static nodes_iterator nodes_begin(SelectionDAG *G) {
942    return G->allnodes_begin();
943  }
944  static nodes_iterator nodes_end(SelectionDAG *G) {
945    return G->allnodes_end();
946  }
947};
948
949}  // end namespace llvm
950
951#endif
952