llvm.org GIT mirror llvm / release_25 utils / TableGen / CodeGenDAGPatterns.h
release_25

Tree @release_25 (Download .tar.gz)

CodeGenDAGPatterns.h @release_25raw · history · blame

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
//===- CodeGenDAGPatterns.h - Read DAG patterns from .td file ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the CodeGenDAGPatterns class, which is used to read and
// represent the patterns present in a .td file for instructions.
//
//===----------------------------------------------------------------------===//

#ifndef CODEGEN_DAGPATTERNS_H
#define CODEGEN_DAGPATTERNS_H

#include <set>
#include <algorithm>
#include <vector>

#include "CodeGenTarget.h"
#include "CodeGenIntrinsics.h"

namespace llvm {
  class Record;
  struct Init;
  class ListInit;
  class DagInit;
  class SDNodeInfo;
  class TreePattern;
  class TreePatternNode;
  class CodeGenDAGPatterns;
  class ComplexPattern;

/// EMVT::DAGISelGenValueType - These are some extended forms of
/// MVT::SimpleValueType that we use as lattice values during type inference.
namespace EMVT {
  enum DAGISelGenValueType {
    isFP  = MVT::LAST_VALUETYPE,
    isInt,
    isUnknown
  };

  /// isExtIntegerVT - Return true if the specified extended value type vector
  /// contains isInt or an integer value type.
  bool isExtIntegerInVTs(const std::vector<unsigned char> &EVTs);

  /// isExtFloatingPointVT - Return true if the specified extended value type 
  /// vector contains isFP or a FP value type.
  bool isExtFloatingPointInVTs(const std::vector<unsigned char> &EVTs);
}

/// Set type used to track multiply used variables in patterns
typedef std::set<std::string> MultipleUseVarSet;

/// SDTypeConstraint - This is a discriminated union of constraints,
/// corresponding to the SDTypeConstraint tablegen class in Target.td.
struct SDTypeConstraint {
  SDTypeConstraint(Record *R);
  
  unsigned OperandNo;   // The operand # this constraint applies to.
  enum { 
    SDTCisVT, SDTCisPtrTy, SDTCisInt, SDTCisFP, SDTCisSameAs, 
    SDTCisVTSmallerThanOp, SDTCisOpSmallerThanOp, SDTCisIntVectorOfSameSize,
    SDTCisEltOfVec
  } ConstraintType;
  
  union {   // The discriminated union.
    struct {
      unsigned char VT;
    } SDTCisVT_Info;
    struct {
      unsigned OtherOperandNum;
    } SDTCisSameAs_Info;
    struct {
      unsigned OtherOperandNum;
    } SDTCisVTSmallerThanOp_Info;
    struct {
      unsigned BigOperandNum;
    } SDTCisOpSmallerThanOp_Info;
    struct {
      unsigned OtherOperandNum;
    } SDTCisIntVectorOfSameSize_Info;
    struct {
      unsigned OtherOperandNum;
    } SDTCisEltOfVec_Info;
  } x;

  /// ApplyTypeConstraint - Given a node in a pattern, apply this type
  /// constraint to the nodes operands.  This returns true if it makes a
  /// change, false otherwise.  If a type contradiction is found, throw an
  /// exception.
  bool ApplyTypeConstraint(TreePatternNode *N, const SDNodeInfo &NodeInfo,
                           TreePattern &TP) const;
  
  /// getOperandNum - Return the node corresponding to operand #OpNo in tree
  /// N, which has NumResults results.
  TreePatternNode *getOperandNum(unsigned OpNo, TreePatternNode *N,
                                 unsigned NumResults) const;
};

/// SDNodeInfo - One of these records is created for each SDNode instance in
/// the target .td file.  This represents the various dag nodes we will be
/// processing.
class SDNodeInfo {
  Record *Def;
  std::string EnumName;
  std::string SDClassName;
  unsigned Properties;
  unsigned NumResults;
  int NumOperands;
  std::vector<SDTypeConstraint> TypeConstraints;
public:
  SDNodeInfo(Record *R);  // Parse the specified record.
  
  unsigned getNumResults() const { return NumResults; }
  int getNumOperands() const { return NumOperands; }
  Record *getRecord() const { return Def; }
  const std::string &getEnumName() const { return EnumName; }
  const std::string &getSDClassName() const { return SDClassName; }
  
  const std::vector<SDTypeConstraint> &getTypeConstraints() const {
    return TypeConstraints;
  }
  
  /// hasProperty - Return true if this node has the specified property.
  ///
  bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }

  /// ApplyTypeConstraints - Given a node in a pattern, apply the type
  /// constraints for this node to the operands of the node.  This returns
  /// true if it makes a change, false otherwise.  If a type contradiction is
  /// found, throw an exception.
  bool ApplyTypeConstraints(TreePatternNode *N, TreePattern &TP) const {
    bool MadeChange = false;
    for (unsigned i = 0, e = TypeConstraints.size(); i != e; ++i)
      MadeChange |= TypeConstraints[i].ApplyTypeConstraint(N, *this, TP);
    return MadeChange;
  }
};

/// FIXME: TreePatternNode's can be shared in some cases (due to dag-shaped
/// patterns), and as such should be ref counted.  We currently just leak all
/// TreePatternNode objects!
class TreePatternNode {
  /// The inferred type for this node, or EMVT::isUnknown if it hasn't
  /// been determined yet.
  std::vector<unsigned char> Types;
  
  /// Operator - The Record for the operator if this is an interior node (not
  /// a leaf).
  Record *Operator;
  
  /// Val - The init value (e.g. the "GPRC" record, or "7") for a leaf.
  ///
  Init *Val;
  
  /// Name - The name given to this node with the :$foo notation.
  ///
  std::string Name;
  
  /// PredicateFns - The predicate functions to execute on this node to check
  /// for a match.  If this list is empty, no predicate is involved.
  std::vector<std::string> PredicateFns;
  
  /// TransformFn - The transformation function to execute on this node before
  /// it can be substituted into the resulting instruction on a pattern match.
  Record *TransformFn;
  
  std::vector<TreePatternNode*> Children;
public:
  TreePatternNode(Record *Op, const std::vector<TreePatternNode*> &Ch) 
    : Types(), Operator(Op), Val(0), TransformFn(0),
    Children(Ch) { Types.push_back(EMVT::isUnknown); }
  TreePatternNode(Init *val)    // leaf ctor
    : Types(), Operator(0), Val(val), TransformFn(0) {
    Types.push_back(EMVT::isUnknown);
  }
  ~TreePatternNode();
  
  const std::string &getName() const { return Name; }
  void setName(const std::string &N) { Name = N; }
  
  bool isLeaf() const { return Val != 0; }
  bool hasTypeSet() const {
    return (Types[0] < MVT::LAST_VALUETYPE) || (Types[0] == MVT::iPTR) || 
          (Types[0] == MVT::iPTRAny);
  }
  bool isTypeCompletelyUnknown() const {
    return Types[0] == EMVT::isUnknown;
  }
  bool isTypeDynamicallyResolved() const {
    return (Types[0] == MVT::iPTR) || (Types[0] == MVT::iPTRAny);
  }
  MVT::SimpleValueType getTypeNum(unsigned Num) const {
    assert(hasTypeSet() && "Doesn't have a type yet!");
    assert(Types.size() > Num && "Type num out of range!");
    return (MVT::SimpleValueType)Types[Num];
  }
  unsigned char getExtTypeNum(unsigned Num) const { 
    assert(Types.size() > Num && "Extended type num out of range!");
    return Types[Num]; 
  }
  const std::vector<unsigned char> &getExtTypes() const { return Types; }
  void setTypes(const std::vector<unsigned char> &T) { Types = T; }
  void removeTypes() { Types = std::vector<unsigned char>(1, EMVT::isUnknown); }
  
  Init *getLeafValue() const { assert(isLeaf()); return Val; }
  Record *getOperator() const { assert(!isLeaf()); return Operator; }
  
  unsigned getNumChildren() const { return Children.size(); }
  TreePatternNode *getChild(unsigned N) const { return Children[N]; }
  void setChild(unsigned i, TreePatternNode *N) {
    Children[i] = N;
  }

  const std::vector<std::string> &getPredicateFns() const { return PredicateFns; }
  void clearPredicateFns() { PredicateFns.clear(); }
  void setPredicateFns(const std::vector<std::string> &Fns) {
    assert(PredicateFns.empty() && "Overwriting non-empty predicate list!");
    PredicateFns = Fns;
  }
  void addPredicateFn(const std::string &Fn) { 
    assert(!Fn.empty() && "Empty predicate string!");
    if (std::find(PredicateFns.begin(), PredicateFns.end(), Fn) ==
          PredicateFns.end())
      PredicateFns.push_back(Fn);
  }

  Record *getTransformFn() const { return TransformFn; }
  void setTransformFn(Record *Fn) { TransformFn = Fn; }
  
  /// getIntrinsicInfo - If this node corresponds to an intrinsic, return the
  /// CodeGenIntrinsic information for it, otherwise return a null pointer.
  const CodeGenIntrinsic *getIntrinsicInfo(const CodeGenDAGPatterns &CDP) const;

  /// isCommutativeIntrinsic - Return true if the node is an intrinsic which is
  /// marked isCommutative.
  bool isCommutativeIntrinsic(const CodeGenDAGPatterns &CDP) const;
  
  void print(std::ostream &OS) const;
  void dump() const;
  
public:   // Higher level manipulation routines.

  /// clone - Return a new copy of this tree.
  ///
  TreePatternNode *clone() const;
  
  /// isIsomorphicTo - Return true if this node is recursively isomorphic to
  /// the specified node.  For this comparison, all of the state of the node
  /// is considered, except for the assigned name.  Nodes with differing names
  /// that are otherwise identical are considered isomorphic.
  bool isIsomorphicTo(const TreePatternNode *N,
                      const MultipleUseVarSet &DepVars) const;
  
  /// SubstituteFormalArguments - Replace the formal arguments in this tree
  /// with actual values specified by ArgMap.
  void SubstituteFormalArguments(std::map<std::string,
                                          TreePatternNode*> &ArgMap);

  /// InlinePatternFragments - If this pattern refers to any pattern
  /// fragments, inline them into place, giving us a pattern without any
  /// PatFrag references.
  TreePatternNode *InlinePatternFragments(TreePattern &TP);
  
  /// ApplyTypeConstraints - Apply all of the type constraints relevant to
  /// this node and its children in the tree.  This returns true if it makes a
  /// change, false otherwise.  If a type contradiction is found, throw an
  /// exception.
  bool ApplyTypeConstraints(TreePattern &TP, bool NotRegisters);
  
  /// UpdateNodeType - Set the node type of N to VT if VT contains
  /// information.  If N already contains a conflicting type, then throw an
  /// exception.  This returns true if any information was updated.
  ///
  bool UpdateNodeType(const std::vector<unsigned char> &ExtVTs,
                      TreePattern &TP);
  bool UpdateNodeType(unsigned char ExtVT, TreePattern &TP) {
    std::vector<unsigned char> ExtVTs(1, ExtVT);
    return UpdateNodeType(ExtVTs, TP);
  }
  
  /// ContainsUnresolvedType - Return true if this tree contains any
  /// unresolved types.
  bool ContainsUnresolvedType() const {
    if (!hasTypeSet() && !isTypeDynamicallyResolved()) return true;
    for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
      if (getChild(i)->ContainsUnresolvedType()) return true;
    return false;
  }
  
  /// canPatternMatch - If it is impossible for this pattern to match on this
  /// target, fill in Reason and return false.  Otherwise, return true.
  bool canPatternMatch(std::string &Reason, const CodeGenDAGPatterns &CDP);
};


/// TreePattern - Represent a pattern, used for instructions, pattern
/// fragments, etc.
///
class TreePattern {
  /// Trees - The list of pattern trees which corresponds to this pattern.
  /// Note that PatFrag's only have a single tree.
  ///
  std::vector<TreePatternNode*> Trees;
  
  /// TheRecord - The actual TableGen record corresponding to this pattern.
  ///
  Record *TheRecord;
    
  /// Args - This is a list of all of the arguments to this pattern (for
  /// PatFrag patterns), which are the 'node' markers in this pattern.
  std::vector<std::string> Args;
  
  /// CDP - the top-level object coordinating this madness.
  ///
  CodeGenDAGPatterns &CDP;

  /// isInputPattern - True if this is an input pattern, something to match.
  /// False if this is an output pattern, something to emit.
  bool isInputPattern;
public:
    
  /// TreePattern constructor - Parse the specified DagInits into the
  /// current record.
  TreePattern(Record *TheRec, ListInit *RawPat, bool isInput,
              CodeGenDAGPatterns &ise);
  TreePattern(Record *TheRec, DagInit *Pat, bool isInput,
              CodeGenDAGPatterns &ise);
  TreePattern(Record *TheRec, TreePatternNode *Pat, bool isInput,
              CodeGenDAGPatterns &ise);
      
  /// getTrees - Return the tree patterns which corresponds to this pattern.
  ///
  const std::vector<TreePatternNode*> &getTrees() const { return Trees; }
  unsigned getNumTrees() const { return Trees.size(); }
  TreePatternNode *getTree(unsigned i) const { return Trees[i]; }
  TreePatternNode *getOnlyTree() const {
    assert(Trees.size() == 1 && "Doesn't have exactly one pattern!");
    return Trees[0];
  }
      
  /// getRecord - Return the actual TableGen record corresponding to this
  /// pattern.
  ///
  Record *getRecord() const { return TheRecord; }
  
  unsigned getNumArgs() const { return Args.size(); }
  const std::string &getArgName(unsigned i) const {
    assert(i < Args.size() && "Argument reference out of range!");
    return Args[i];
  }
  std::vector<std::string> &getArgList() { return Args; }
  
  CodeGenDAGPatterns &getDAGPatterns() const { return CDP; }

  /// InlinePatternFragments - If this pattern refers to any pattern
  /// fragments, inline them into place, giving us a pattern without any
  /// PatFrag references.
  void InlinePatternFragments() {
    for (unsigned i = 0, e = Trees.size(); i != e; ++i)
      Trees[i] = Trees[i]->InlinePatternFragments(*this);
  }
  
  /// InferAllTypes - Infer/propagate as many types throughout the expression
  /// patterns as possible.  Return true if all types are infered, false
  /// otherwise.  Throw an exception if a type contradiction is found.
  bool InferAllTypes();
  
  /// error - Throw an exception, prefixing it with information about this
  /// pattern.
  void error(const std::string &Msg) const;
  
  void print(std::ostream &OS) const;
  void dump() const;
  
private:
  TreePatternNode *ParseTreePattern(DagInit *DI);
};

/// DAGDefaultOperand - One of these is created for each PredicateOperand
/// or OptionalDefOperand that has a set ExecuteAlways / DefaultOps field.
struct DAGDefaultOperand {
  std::vector<TreePatternNode*> DefaultOps;
};

class DAGInstruction {
  TreePattern *Pattern;
  std::vector<Record*> Results;
  std::vector<Record*> Operands;
  std::vector<Record*> ImpResults;
  std::vector<Record*> ImpOperands;
  TreePatternNode *ResultPattern;
public:
  DAGInstruction(TreePattern *TP,
                 const std::vector<Record*> &results,
                 const std::vector<Record*> &operands,
                 const std::vector<Record*> &impresults,
                 const std::vector<Record*> &impoperands)
    : Pattern(TP), Results(results), Operands(operands), 
      ImpResults(impresults), ImpOperands(impoperands),
      ResultPattern(0) {}

  const TreePattern *getPattern() const { return Pattern; }
  unsigned getNumResults() const { return Results.size(); }
  unsigned getNumOperands() const { return Operands.size(); }
  unsigned getNumImpResults() const { return ImpResults.size(); }
  unsigned getNumImpOperands() const { return ImpOperands.size(); }
  const std::vector<Record*>& getImpResults() const { return ImpResults; }
  
  void setResultPattern(TreePatternNode *R) { ResultPattern = R; }
  
  Record *getResult(unsigned RN) const {
    assert(RN < Results.size());
    return Results[RN];
  }
  
  Record *getOperand(unsigned ON) const {
    assert(ON < Operands.size());
    return Operands[ON];
  }

  Record *getImpResult(unsigned RN) const {
    assert(RN < ImpResults.size());
    return ImpResults[RN];
  }
  
  Record *getImpOperand(unsigned ON) const {
    assert(ON < ImpOperands.size());
    return ImpOperands[ON];
  }

  TreePatternNode *getResultPattern() const { return ResultPattern; }
};
  
/// PatternToMatch - Used by CodeGenDAGPatterns to keep tab of patterns
/// processed to produce isel.
struct PatternToMatch {
  PatternToMatch(ListInit *preds,
                 TreePatternNode *src, TreePatternNode *dst,
                 const std::vector<Record*> &dstregs,
                 unsigned complexity):
    Predicates(preds), SrcPattern(src), DstPattern(dst), Dstregs(dstregs),
    AddedComplexity(complexity) {};

  ListInit        *Predicates;  // Top level predicate conditions to match.
  TreePatternNode *SrcPattern;  // Source pattern to match.
  TreePatternNode *DstPattern;  // Resulting pattern.
  std::vector<Record*> Dstregs; // Physical register defs being matched.
  unsigned         AddedComplexity; // Add to matching pattern complexity.

  ListInit        *getPredicates() const { return Predicates; }
  TreePatternNode *getSrcPattern() const { return SrcPattern; }
  TreePatternNode *getDstPattern() const { return DstPattern; }
  const std::vector<Record*> &getDstRegs() const { return Dstregs; }
  unsigned         getAddedComplexity() const { return AddedComplexity; }

  std::string getPredicateCheck() const;
};

  
class CodeGenDAGPatterns {
  RecordKeeper &Records;
  CodeGenTarget Target;
  std::vector<CodeGenIntrinsic> Intrinsics;
  
  std::map<Record*, SDNodeInfo> SDNodes;
  std::map<Record*, std::pair<Record*, std::string> > SDNodeXForms;
  std::map<Record*, ComplexPattern> ComplexPatterns;
  std::map<Record*, TreePattern*> PatternFragments;
  std::map<Record*, DAGDefaultOperand> DefaultOperands;
  std::map<Record*, DAGInstruction> Instructions;
  
  // Specific SDNode definitions:
  Record *intrinsic_void_sdnode;
  Record *intrinsic_w_chain_sdnode, *intrinsic_wo_chain_sdnode;
  
  /// PatternsToMatch - All of the things we are matching on the DAG.  The first
  /// value is the pattern to match, the second pattern is the result to
  /// emit.
  std::vector<PatternToMatch> PatternsToMatch;
public:
  CodeGenDAGPatterns(RecordKeeper &R); 
  ~CodeGenDAGPatterns();
  
  CodeGenTarget &getTargetInfo() { return Target; }
  const CodeGenTarget &getTargetInfo() const { return Target; }
  
  Record *getSDNodeNamed(const std::string &Name) const;
  
  const SDNodeInfo &getSDNodeInfo(Record *R) const {
    assert(SDNodes.count(R) && "Unknown node!");
    return SDNodes.find(R)->second;
  }
  
  // Node transformation lookups.
  typedef std::pair<Record*, std::string> NodeXForm;
  const NodeXForm &getSDNodeTransform(Record *R) const {
    assert(SDNodeXForms.count(R) && "Invalid transform!");
    return SDNodeXForms.find(R)->second;
  }
  
  typedef std::map<Record*, NodeXForm>::const_iterator nx_iterator;
  nx_iterator nx_begin() const { return SDNodeXForms.begin(); }
  nx_iterator nx_end() const { return SDNodeXForms.end(); }

  
  const ComplexPattern &getComplexPattern(Record *R) const {
    assert(ComplexPatterns.count(R) && "Unknown addressing mode!");
    return ComplexPatterns.find(R)->second;
  }
  
  const CodeGenIntrinsic &getIntrinsic(Record *R) const {
    for (unsigned i = 0, e = Intrinsics.size(); i != e; ++i)
      if (Intrinsics[i].TheDef == R) return Intrinsics[i];
    assert(0 && "Unknown intrinsic!");
    abort();
  }
  
  const CodeGenIntrinsic &getIntrinsicInfo(unsigned IID) const {
    assert(IID-1 < Intrinsics.size() && "Bad intrinsic ID!");
    return Intrinsics[IID-1];
  }
  
  unsigned getIntrinsicID(Record *R) const {
    for (unsigned i = 0, e = Intrinsics.size(); i != e; ++i)
      if (Intrinsics[i].TheDef == R) return i;
    assert(0 && "Unknown intrinsic!");
    abort();
  }
  
  const DAGDefaultOperand &getDefaultOperand(Record *R) {
    assert(DefaultOperands.count(R) &&"Isn't an analyzed default operand!");
    return DefaultOperands.find(R)->second;
  }
  
  // Pattern Fragment information.
  TreePattern *getPatternFragment(Record *R) const {
    assert(PatternFragments.count(R) && "Invalid pattern fragment request!");
    return PatternFragments.find(R)->second;
  }
  typedef std::map<Record*, TreePattern*>::const_iterator pf_iterator;
  pf_iterator pf_begin() const { return PatternFragments.begin(); }
  pf_iterator pf_end() const { return PatternFragments.end(); }

  // Patterns to match information.
  typedef std::vector<PatternToMatch>::const_iterator ptm_iterator;
  ptm_iterator ptm_begin() const { return PatternsToMatch.begin(); }
  ptm_iterator ptm_end() const { return PatternsToMatch.end(); }
  
  
  
  const DAGInstruction &getInstruction(Record *R) const {
    assert(Instructions.count(R) && "Unknown instruction!");
    return Instructions.find(R)->second;
  }
  
  Record *get_intrinsic_void_sdnode() const {
    return intrinsic_void_sdnode;
  }
  Record *get_intrinsic_w_chain_sdnode() const {
    return intrinsic_w_chain_sdnode;
  }
  Record *get_intrinsic_wo_chain_sdnode() const {
    return intrinsic_wo_chain_sdnode;
  }
  
private:
  void ParseNodeInfo();
  void ParseNodeTransforms();
  void ParseComplexPatterns();
  void ParsePatternFragments();
  void ParseDefaultOperands();
  void ParseInstructions();
  void ParsePatterns();
  void InferInstructionFlags();
  void GenerateVariants();
  
  void FindPatternInputsAndOutputs(TreePattern *I, TreePatternNode *Pat,
                                   std::map<std::string,
                                   TreePatternNode*> &InstInputs,
                                   std::map<std::string,
                                   TreePatternNode*> &InstResults,
                                   std::vector<Record*> &InstImpInputs,
                                   std::vector<Record*> &InstImpResults);
};
} // end namespace llvm

#endif