llvm.org GIT mirror llvm / release_35 utils / TableGen / DAGISelMatcherEmitter.cpp
release_35

Tree @release_35 (Download .tar.gz)

DAGISelMatcherEmitter.cpp @release_35raw · 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
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
//===- DAGISelMatcherEmitter.cpp - Matcher Emitter ------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to generate C++ code for a matcher.
//
//===----------------------------------------------------------------------===//

#include "DAGISelMatcher.h"
#include "CodeGenDAGPatterns.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/TableGen/Record.h"
using namespace llvm;

enum {
  CommentIndent = 30
};

// To reduce generated source code size.
static cl::opt<bool>
OmitComments("omit-comments", cl::desc("Do not generate comments"),
             cl::init(false));

namespace {
class MatcherTableEmitter {
  const CodeGenDAGPatterns &CGP;
  
  DenseMap<TreePattern *, unsigned> NodePredicateMap;
  std::vector<TreePredicateFn> NodePredicates;
  
  StringMap<unsigned> PatternPredicateMap;
  std::vector<std::string> PatternPredicates;

  DenseMap<const ComplexPattern*, unsigned> ComplexPatternMap;
  std::vector<const ComplexPattern*> ComplexPatterns;


  DenseMap<Record*, unsigned> NodeXFormMap;
  std::vector<Record*> NodeXForms;

public:
  MatcherTableEmitter(const CodeGenDAGPatterns &cgp)
    : CGP(cgp) {}

  unsigned EmitMatcherList(const Matcher *N, unsigned Indent,
                           unsigned StartIdx, formatted_raw_ostream &OS);

  void EmitPredicateFunctions(formatted_raw_ostream &OS);

  void EmitHistogram(const Matcher *N, formatted_raw_ostream &OS);
private:
  unsigned EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
                       formatted_raw_ostream &OS);

  unsigned getNodePredicate(TreePredicateFn Pred) {
    unsigned &Entry = NodePredicateMap[Pred.getOrigPatFragRecord()];
    if (Entry == 0) {
      NodePredicates.push_back(Pred);
      Entry = NodePredicates.size();
    }
    return Entry-1;
  }
  
  unsigned getPatternPredicate(StringRef PredName) {
    unsigned &Entry = PatternPredicateMap[PredName];
    if (Entry == 0) {
      PatternPredicates.push_back(PredName.str());
      Entry = PatternPredicates.size();
    }
    return Entry-1;
  }
  unsigned getComplexPat(const ComplexPattern &P) {
    unsigned &Entry = ComplexPatternMap[&P];
    if (Entry == 0) {
      ComplexPatterns.push_back(&P);
      Entry = ComplexPatterns.size();
    }
    return Entry-1;
  }

  unsigned getNodeXFormID(Record *Rec) {
    unsigned &Entry = NodeXFormMap[Rec];
    if (Entry == 0) {
      NodeXForms.push_back(Rec);
      Entry = NodeXForms.size();
    }
    return Entry-1;
  }

};
} // end anonymous namespace.

static unsigned GetVBRSize(unsigned Val) {
  if (Val <= 127) return 1;

  unsigned NumBytes = 0;
  while (Val >= 128) {
    Val >>= 7;
    ++NumBytes;
  }
  return NumBytes+1;
}

/// EmitVBRValue - Emit the specified value as a VBR, returning the number of
/// bytes emitted.
static uint64_t EmitVBRValue(uint64_t Val, raw_ostream &OS) {
  if (Val <= 127) {
    OS << Val << ", ";
    return 1;
  }

  uint64_t InVal = Val;
  unsigned NumBytes = 0;
  while (Val >= 128) {
    OS << (Val&127) << "|128,";
    Val >>= 7;
    ++NumBytes;
  }
  OS << Val;
  if (!OmitComments)
    OS << "/*" << InVal << "*/";
  OS << ", ";
  return NumBytes+1;
}

/// EmitMatcher - Emit bytes for the specified matcher and return
/// the number of bytes emitted.
unsigned MatcherTableEmitter::
EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
            formatted_raw_ostream &OS) {
  OS.PadToColumn(Indent*2);

  switch (N->getKind()) {
  case Matcher::Scope: {
    const ScopeMatcher *SM = cast<ScopeMatcher>(N);
    assert(SM->getNext() == nullptr && "Shouldn't have next after scope");

    unsigned StartIdx = CurrentIdx;

    // Emit all of the children.
    for (unsigned i = 0, e = SM->getNumChildren(); i != e; ++i) {
      if (i == 0) {
        OS << "OPC_Scope, ";
        ++CurrentIdx;
      } else  {
        if (!OmitComments) {
          OS << "/*" << CurrentIdx << "*/";
          OS.PadToColumn(Indent*2) << "/*Scope*/ ";
        } else
          OS.PadToColumn(Indent*2);
      }

      // We need to encode the child and the offset of the failure code before
      // emitting either of them.  Handle this by buffering the output into a
      // string while we get the size.  Unfortunately, the offset of the
      // children depends on the VBR size of the child, so for large children we
      // have to iterate a bit.
      SmallString<128> TmpBuf;
      unsigned ChildSize = 0;
      unsigned VBRSize = 0;
      do {
        VBRSize = GetVBRSize(ChildSize);

        TmpBuf.clear();
        raw_svector_ostream OS(TmpBuf);
        formatted_raw_ostream FOS(OS);
        ChildSize = EmitMatcherList(SM->getChild(i), Indent+1,
                                    CurrentIdx+VBRSize, FOS);
      } while (GetVBRSize(ChildSize) != VBRSize);

      assert(ChildSize != 0 && "Should not have a zero-sized child!");

      CurrentIdx += EmitVBRValue(ChildSize, OS);
      if (!OmitComments) {
        OS << "/*->" << CurrentIdx+ChildSize << "*/";

        if (i == 0)
          OS.PadToColumn(CommentIndent) << "// " << SM->getNumChildren()
            << " children in Scope";
      }

      OS << '\n' << TmpBuf.str();
      CurrentIdx += ChildSize;
    }

    // Emit a zero as a sentinel indicating end of 'Scope'.
    if (!OmitComments)
      OS << "/*" << CurrentIdx << "*/";
    OS.PadToColumn(Indent*2) << "0, ";
    if (!OmitComments)
      OS << "/*End of Scope*/";
    OS << '\n';
    return CurrentIdx - StartIdx + 1;
  }

  case Matcher::RecordNode:
    OS << "OPC_RecordNode,";
    if (!OmitComments)
      OS.PadToColumn(CommentIndent) << "// #"
        << cast<RecordMatcher>(N)->getResultNo() << " = "
        << cast<RecordMatcher>(N)->getWhatFor();
    OS << '\n';
    return 1;

  case Matcher::RecordChild:
    OS << "OPC_RecordChild" << cast<RecordChildMatcher>(N)->getChildNo()
       << ',';
    if (!OmitComments)
      OS.PadToColumn(CommentIndent) << "// #"
        << cast<RecordChildMatcher>(N)->getResultNo() << " = "
        << cast<RecordChildMatcher>(N)->getWhatFor();
    OS << '\n';
    return 1;

  case Matcher::RecordMemRef:
    OS << "OPC_RecordMemRef,\n";
    return 1;

  case Matcher::CaptureGlueInput:
    OS << "OPC_CaptureGlueInput,\n";
    return 1;

  case Matcher::MoveChild:
    OS << "OPC_MoveChild, " << cast<MoveChildMatcher>(N)->getChildNo() << ",\n";
    return 2;

  case Matcher::MoveParent:
    OS << "OPC_MoveParent,\n";
    return 1;

  case Matcher::CheckSame:
    OS << "OPC_CheckSame, "
       << cast<CheckSameMatcher>(N)->getMatchNumber() << ",\n";
    return 2;

  case Matcher::CheckChildSame:
    OS << "OPC_CheckChild"
       << cast<CheckChildSameMatcher>(N)->getChildNo() << "Same, "
       << cast<CheckChildSameMatcher>(N)->getMatchNumber() << ",\n";
    return 2;

  case Matcher::CheckPatternPredicate: {
    StringRef Pred =cast<CheckPatternPredicateMatcher>(N)->getPredicate();
    OS << "OPC_CheckPatternPredicate, " << getPatternPredicate(Pred) << ',';
    if (!OmitComments)
      OS.PadToColumn(CommentIndent) << "// " << Pred;
    OS << '\n';
    return 2;
  }
  case Matcher::CheckPredicate: {
    TreePredicateFn Pred = cast<CheckPredicateMatcher>(N)->getPredicate();
    OS << "OPC_CheckPredicate, " << getNodePredicate(Pred) << ',';
    if (!OmitComments)
      OS.PadToColumn(CommentIndent) << "// " << Pred.getFnName();
    OS << '\n';
    return 2;
  }

  case Matcher::CheckOpcode:
    OS << "OPC_CheckOpcode, TARGET_VAL("
       << cast<CheckOpcodeMatcher>(N)->getOpcode().getEnumName() << "),\n";
    return 3;

  case Matcher::SwitchOpcode:
  case Matcher::SwitchType: {
    unsigned StartIdx = CurrentIdx;

    unsigned NumCases;
    if (const SwitchOpcodeMatcher *SOM = dyn_cast<SwitchOpcodeMatcher>(N)) {
      OS << "OPC_SwitchOpcode ";
      NumCases = SOM->getNumCases();
    } else {
      OS << "OPC_SwitchType ";
      NumCases = cast<SwitchTypeMatcher>(N)->getNumCases();
    }

    if (!OmitComments)
      OS << "/*" << NumCases << " cases */";
    OS << ", ";
    ++CurrentIdx;

    // For each case we emit the size, then the opcode, then the matcher.
    for (unsigned i = 0, e = NumCases; i != e; ++i) {
      const Matcher *Child;
      unsigned IdxSize;
      if (const SwitchOpcodeMatcher *SOM = dyn_cast<SwitchOpcodeMatcher>(N)) {
        Child = SOM->getCaseMatcher(i);
        IdxSize = 2;  // size of opcode in table is 2 bytes.
      } else {
        Child = cast<SwitchTypeMatcher>(N)->getCaseMatcher(i);
        IdxSize = 1;  // size of type in table is 1 byte.
      }

      // We need to encode the opcode and the offset of the case code before
      // emitting the case code.  Handle this by buffering the output into a
      // string while we get the size.  Unfortunately, the offset of the
      // children depends on the VBR size of the child, so for large children we
      // have to iterate a bit.
      SmallString<128> TmpBuf;
      unsigned ChildSize = 0;
      unsigned VBRSize = 0;
      do {
        VBRSize = GetVBRSize(ChildSize);

        TmpBuf.clear();
        raw_svector_ostream OS(TmpBuf);
        formatted_raw_ostream FOS(OS);
        ChildSize = EmitMatcherList(Child, Indent+1, CurrentIdx+VBRSize+IdxSize,
                                    FOS);
      } while (GetVBRSize(ChildSize) != VBRSize);

      assert(ChildSize != 0 && "Should not have a zero-sized child!");

      if (i != 0) {
        if (!OmitComments)
          OS << "/*" << CurrentIdx << "*/";
        OS.PadToColumn(Indent*2);
        if (!OmitComments)
          OS << (isa<SwitchOpcodeMatcher>(N) ?
                     "/*SwitchOpcode*/ " : "/*SwitchType*/ ");
      }

      // Emit the VBR.
      CurrentIdx += EmitVBRValue(ChildSize, OS);

      if (const SwitchOpcodeMatcher *SOM = dyn_cast<SwitchOpcodeMatcher>(N))
        OS << "TARGET_VAL(" << SOM->getCaseOpcode(i).getEnumName() << "),";
      else
        OS << getEnumName(cast<SwitchTypeMatcher>(N)->getCaseType(i)) << ',';

      CurrentIdx += IdxSize;

      if (!OmitComments)
        OS << "// ->" << CurrentIdx+ChildSize;
      OS << '\n';
      OS << TmpBuf.str();
      CurrentIdx += ChildSize;
    }

    // Emit the final zero to terminate the switch.
    if (!OmitComments)
      OS << "/*" << CurrentIdx << "*/";
    OS.PadToColumn(Indent*2) << "0, ";
    if (!OmitComments)
      OS << (isa<SwitchOpcodeMatcher>(N) ?
             "// EndSwitchOpcode" : "// EndSwitchType");

    OS << '\n';
    ++CurrentIdx;
    return CurrentIdx-StartIdx;
  }

 case Matcher::CheckType:
    assert(cast<CheckTypeMatcher>(N)->getResNo() == 0 &&
           "FIXME: Add support for CheckType of resno != 0");
    OS << "OPC_CheckType, "
       << getEnumName(cast<CheckTypeMatcher>(N)->getType()) << ",\n";
    return 2;

  case Matcher::CheckChildType:
    OS << "OPC_CheckChild"
       << cast<CheckChildTypeMatcher>(N)->getChildNo() << "Type, "
       << getEnumName(cast<CheckChildTypeMatcher>(N)->getType()) << ",\n";
    return 2;

  case Matcher::CheckInteger: {
    OS << "OPC_CheckInteger, ";
    unsigned Bytes=1+EmitVBRValue(cast<CheckIntegerMatcher>(N)->getValue(), OS);
    OS << '\n';
    return Bytes;
  }
  case Matcher::CheckChildInteger: {
    OS << "OPC_CheckChild" << cast<CheckChildIntegerMatcher>(N)->getChildNo()
       << "Integer, ";
    unsigned Bytes=1+EmitVBRValue(cast<CheckChildIntegerMatcher>(N)->getValue(),
                                  OS);
    OS << '\n';
    return Bytes;
  }
  case Matcher::CheckCondCode:
    OS << "OPC_CheckCondCode, ISD::"
       << cast<CheckCondCodeMatcher>(N)->getCondCodeName() << ",\n";
    return 2;

  case Matcher::CheckValueType:
    OS << "OPC_CheckValueType, MVT::"
       << cast<CheckValueTypeMatcher>(N)->getTypeName() << ",\n";
    return 2;

  case Matcher::CheckComplexPat: {
    const CheckComplexPatMatcher *CCPM = cast<CheckComplexPatMatcher>(N);
    const ComplexPattern &Pattern = CCPM->getPattern();
    OS << "OPC_CheckComplexPat, /*CP*/" << getComplexPat(Pattern) << ", /*#*/"
       << CCPM->getMatchNumber() << ',';

    if (!OmitComments) {
      OS.PadToColumn(CommentIndent) << "// " << Pattern.getSelectFunc();
      OS << ":$" << CCPM->getName();
      for (unsigned i = 0, e = Pattern.getNumOperands(); i != e; ++i)
        OS << " #" << CCPM->getFirstResult()+i;

      if (Pattern.hasProperty(SDNPHasChain))
        OS << " + chain result";
    }
    OS << '\n';
    return 3;
  }

  case Matcher::CheckAndImm: {
    OS << "OPC_CheckAndImm, ";
    unsigned Bytes=1+EmitVBRValue(cast<CheckAndImmMatcher>(N)->getValue(), OS);
    OS << '\n';
    return Bytes;
  }

  case Matcher::CheckOrImm: {
    OS << "OPC_CheckOrImm, ";
    unsigned Bytes = 1+EmitVBRValue(cast<CheckOrImmMatcher>(N)->getValue(), OS);
    OS << '\n';
    return Bytes;
  }

  case Matcher::CheckFoldableChainNode:
    OS << "OPC_CheckFoldableChainNode,\n";
    return 1;

  case Matcher::EmitInteger: {
    int64_t Val = cast<EmitIntegerMatcher>(N)->getValue();
    OS << "OPC_EmitInteger, "
       << getEnumName(cast<EmitIntegerMatcher>(N)->getVT()) << ", ";
    unsigned Bytes = 2+EmitVBRValue(Val, OS);
    OS << '\n';
    return Bytes;
  }
  case Matcher::EmitStringInteger: {
    const std::string &Val = cast<EmitStringIntegerMatcher>(N)->getValue();
    // These should always fit into one byte.
    OS << "OPC_EmitInteger, "
      << getEnumName(cast<EmitStringIntegerMatcher>(N)->getVT()) << ", "
      << Val << ",\n";
    return 3;
  }

  case Matcher::EmitRegister: {
    const EmitRegisterMatcher *Matcher = cast<EmitRegisterMatcher>(N);
    const CodeGenRegister *Reg = Matcher->getReg();
    // If the enum value of the register is larger than one byte can handle,
    // use EmitRegister2.
    if (Reg && Reg->EnumValue > 255) {
      OS << "OPC_EmitRegister2, " << getEnumName(Matcher->getVT()) << ", ";
      OS << "TARGET_VAL(" << getQualifiedName(Reg->TheDef) << "),\n";
      return 4;
    } else {
      OS << "OPC_EmitRegister, " << getEnumName(Matcher->getVT()) << ", ";
      if (Reg) {
        OS << getQualifiedName(Reg->TheDef) << ",\n";
      } else {
        OS << "0 ";
        if (!OmitComments)
          OS << "/*zero_reg*/";
        OS << ",\n";
      }
      return 3;
    }
  }

  case Matcher::EmitConvertToTarget:
    OS << "OPC_EmitConvertToTarget, "
       << cast<EmitConvertToTargetMatcher>(N)->getSlot() << ",\n";
    return 2;

  case Matcher::EmitMergeInputChains: {
    const EmitMergeInputChainsMatcher *MN =
      cast<EmitMergeInputChainsMatcher>(N);

    // Handle the specialized forms OPC_EmitMergeInputChains1_0 and 1_1.
    if (MN->getNumNodes() == 1 && MN->getNode(0) < 2) {
      OS << "OPC_EmitMergeInputChains1_" << MN->getNode(0) << ",\n";
      return 1;
    }

    OS << "OPC_EmitMergeInputChains, " << MN->getNumNodes() << ", ";
    for (unsigned i = 0, e = MN->getNumNodes(); i != e; ++i)
      OS << MN->getNode(i) << ", ";
    OS << '\n';
    return 2+MN->getNumNodes();
  }
  case Matcher::EmitCopyToReg:
    OS << "OPC_EmitCopyToReg, "
       << cast<EmitCopyToRegMatcher>(N)->getSrcSlot() << ", "
       << getQualifiedName(cast<EmitCopyToRegMatcher>(N)->getDestPhysReg())
       << ",\n";
    return 3;
  case Matcher::EmitNodeXForm: {
    const EmitNodeXFormMatcher *XF = cast<EmitNodeXFormMatcher>(N);
    OS << "OPC_EmitNodeXForm, " << getNodeXFormID(XF->getNodeXForm()) << ", "
       << XF->getSlot() << ',';
    if (!OmitComments)
      OS.PadToColumn(CommentIndent) << "// "<<XF->getNodeXForm()->getName();
    OS <<'\n';
    return 3;
  }

  case Matcher::EmitNode:
  case Matcher::MorphNodeTo: {
    const EmitNodeMatcherCommon *EN = cast<EmitNodeMatcherCommon>(N);
    OS << (isa<EmitNodeMatcher>(EN) ? "OPC_EmitNode" : "OPC_MorphNodeTo");
    OS << ", TARGET_VAL(" << EN->getOpcodeName() << "), 0";

    if (EN->hasChain())   OS << "|OPFL_Chain";
    if (EN->hasInFlag())  OS << "|OPFL_GlueInput";
    if (EN->hasOutFlag()) OS << "|OPFL_GlueOutput";
    if (EN->hasMemRefs()) OS << "|OPFL_MemRefs";
    if (EN->getNumFixedArityOperands() != -1)
      OS << "|OPFL_Variadic" << EN->getNumFixedArityOperands();
    OS << ",\n";

    OS.PadToColumn(Indent*2+4) << EN->getNumVTs();
    if (!OmitComments)
      OS << "/*#VTs*/";
    OS << ", ";
    for (unsigned i = 0, e = EN->getNumVTs(); i != e; ++i)
      OS << getEnumName(EN->getVT(i)) << ", ";

    OS << EN->getNumOperands();
    if (!OmitComments)
      OS << "/*#Ops*/";
    OS << ", ";
    unsigned NumOperandBytes = 0;
    for (unsigned i = 0, e = EN->getNumOperands(); i != e; ++i)
      NumOperandBytes += EmitVBRValue(EN->getOperand(i), OS);

    if (!OmitComments) {
      // Print the result #'s for EmitNode.
      if (const EmitNodeMatcher *E = dyn_cast<EmitNodeMatcher>(EN)) {
        if (unsigned NumResults = EN->getNumVTs()) {
          OS.PadToColumn(CommentIndent) << "// Results =";
          unsigned First = E->getFirstResultSlot();
          for (unsigned i = 0; i != NumResults; ++i)
            OS << " #" << First+i;
        }
      }
      OS << '\n';

      if (const MorphNodeToMatcher *SNT = dyn_cast<MorphNodeToMatcher>(N)) {
        OS.PadToColumn(Indent*2) << "// Src: "
          << *SNT->getPattern().getSrcPattern() << " - Complexity = "
          << SNT->getPattern().getPatternComplexity(CGP) << '\n';
        OS.PadToColumn(Indent*2) << "// Dst: "
          << *SNT->getPattern().getDstPattern() << '\n';
      }
    } else
      OS << '\n';

    return 6+EN->getNumVTs()+NumOperandBytes;
  }
  case Matcher::MarkGlueResults: {
    const MarkGlueResultsMatcher *CFR = cast<MarkGlueResultsMatcher>(N);
    OS << "OPC_MarkGlueResults, " << CFR->getNumNodes() << ", ";
    unsigned NumOperandBytes = 0;
    for (unsigned i = 0, e = CFR->getNumNodes(); i != e; ++i)
      NumOperandBytes += EmitVBRValue(CFR->getNode(i), OS);
    OS << '\n';
    return 2+NumOperandBytes;
  }
  case Matcher::CompleteMatch: {
    const CompleteMatchMatcher *CM = cast<CompleteMatchMatcher>(N);
    OS << "OPC_CompleteMatch, " << CM->getNumResults() << ", ";
    unsigned NumResultBytes = 0;
    for (unsigned i = 0, e = CM->getNumResults(); i != e; ++i)
      NumResultBytes += EmitVBRValue(CM->getResult(i), OS);
    OS << '\n';
    if (!OmitComments) {
      OS.PadToColumn(Indent*2) << "// Src: "
        << *CM->getPattern().getSrcPattern() << " - Complexity = "
        << CM->getPattern().getPatternComplexity(CGP) << '\n';
      OS.PadToColumn(Indent*2) << "// Dst: "
        << *CM->getPattern().getDstPattern();
    }
    OS << '\n';
    return 2 + NumResultBytes;
  }
  }
  llvm_unreachable("Unreachable");
}

/// EmitMatcherList - Emit the bytes for the specified matcher subtree.
unsigned MatcherTableEmitter::
EmitMatcherList(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
                formatted_raw_ostream &OS) {
  unsigned Size = 0;
  while (N) {
    if (!OmitComments)
      OS << "/*" << CurrentIdx << "*/";
    unsigned MatcherSize = EmitMatcher(N, Indent, CurrentIdx, OS);
    Size += MatcherSize;
    CurrentIdx += MatcherSize;

    // If there are other nodes in this list, iterate to them, otherwise we're
    // done.
    N = N->getNext();
  }
  return Size;
}

void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
  // Emit pattern predicates.
  if (!PatternPredicates.empty()) {
    OS << "bool CheckPatternPredicate(unsigned PredNo) const override {\n";
    OS << "  switch (PredNo) {\n";
    OS << "  default: llvm_unreachable(\"Invalid predicate in table?\");\n";
    for (unsigned i = 0, e = PatternPredicates.size(); i != e; ++i)
      OS << "  case " << i << ": return "  << PatternPredicates[i] << ";\n";
    OS << "  }\n";
    OS << "}\n\n";
  }

  // Emit Node predicates.
  // FIXME: Annoyingly, these are stored by name, which we never even emit. Yay?
  StringMap<TreePattern*> PFsByName;

  for (CodeGenDAGPatterns::pf_iterator I = CGP.pf_begin(), E = CGP.pf_end();
       I != E; ++I)
    PFsByName[I->first->getName()] = I->second;

  if (!NodePredicates.empty()) {
    OS << "bool CheckNodePredicate(SDNode *Node,\n";
    OS << "                        unsigned PredNo) const override {\n";
    OS << "  switch (PredNo) {\n";
    OS << "  default: llvm_unreachable(\"Invalid predicate in table?\");\n";
    for (unsigned i = 0, e = NodePredicates.size(); i != e; ++i) {
      // Emit the predicate code corresponding to this pattern.
      TreePredicateFn PredFn = NodePredicates[i];
      
      assert(!PredFn.isAlwaysTrue() && "No code in this predicate");
      OS << "  case " << i << ": { // " << NodePredicates[i].getFnName() <<'\n';
      
      OS << PredFn.getCodeToRunOnSDNode() << "\n  }\n";
    }
    OS << "  }\n";
    OS << "}\n\n";
  }

  // Emit CompletePattern matchers.
  // FIXME: This should be const.
  if (!ComplexPatterns.empty()) {
    OS << "bool CheckComplexPattern(SDNode *Root, SDNode *Parent,\n";
    OS << "                         SDValue N, unsigned PatternNo,\n";
    OS << "         SmallVectorImpl<std::pair<SDValue, SDNode*> > &Result) override {\n";
    OS << "  unsigned NextRes = Result.size();\n";
    OS << "  switch (PatternNo) {\n";
    OS << "  default: llvm_unreachable(\"Invalid pattern # in table?\");\n";
    for (unsigned i = 0, e = ComplexPatterns.size(); i != e; ++i) {
      const ComplexPattern &P = *ComplexPatterns[i];
      unsigned NumOps = P.getNumOperands();

      if (P.hasProperty(SDNPHasChain))
        ++NumOps;  // Get the chained node too.

      OS << "  case " << i << ":\n";
      OS << "    Result.resize(NextRes+" << NumOps << ");\n";
      OS << "    return "  << P.getSelectFunc();

      OS << "(";
      // If the complex pattern wants the root of the match, pass it in as the
      // first argument.
      if (P.hasProperty(SDNPWantRoot))
        OS << "Root, ";

      // If the complex pattern wants the parent of the operand being matched,
      // pass it in as the next argument.
      if (P.hasProperty(SDNPWantParent))
        OS << "Parent, ";

      OS << "N";
      for (unsigned i = 0; i != NumOps; ++i)
        OS << ", Result[NextRes+" << i << "].first";
      OS << ");\n";
    }
    OS << "  }\n";
    OS << "}\n\n";
  }


  // Emit SDNodeXForm handlers.
  // FIXME: This should be const.
  if (!NodeXForms.empty()) {
    OS << "SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) override {\n";
    OS << "  switch (XFormNo) {\n";
    OS << "  default: llvm_unreachable(\"Invalid xform # in table?\");\n";

    // FIXME: The node xform could take SDValue's instead of SDNode*'s.
    for (unsigned i = 0, e = NodeXForms.size(); i != e; ++i) {
      const CodeGenDAGPatterns::NodeXForm &Entry =
        CGP.getSDNodeTransform(NodeXForms[i]);

      Record *SDNode = Entry.first;
      const std::string &Code = Entry.second;

      OS << "  case " << i << ": {  ";
      if (!OmitComments)
        OS << "// " << NodeXForms[i]->getName();
      OS << '\n';

      std::string ClassName = CGP.getSDNodeInfo(SDNode).getSDClassName();
      if (ClassName == "SDNode")
        OS << "    SDNode *N = V.getNode();\n";
      else
        OS << "    " << ClassName << " *N = cast<" << ClassName
           << ">(V.getNode());\n";
      OS << Code << "\n  }\n";
    }
    OS << "  }\n";
    OS << "}\n\n";
  }
}

static void BuildHistogram(const Matcher *M, std::vector<unsigned> &OpcodeFreq){
  for (; M != nullptr; M = M->getNext()) {
    // Count this node.
    if (unsigned(M->getKind()) >= OpcodeFreq.size())
      OpcodeFreq.resize(M->getKind()+1);
    OpcodeFreq[M->getKind()]++;

    // Handle recursive nodes.
    if (const ScopeMatcher *SM = dyn_cast<ScopeMatcher>(M)) {
      for (unsigned i = 0, e = SM->getNumChildren(); i != e; ++i)
        BuildHistogram(SM->getChild(i), OpcodeFreq);
    } else if (const SwitchOpcodeMatcher *SOM =
                 dyn_cast<SwitchOpcodeMatcher>(M)) {
      for (unsigned i = 0, e = SOM->getNumCases(); i != e; ++i)
        BuildHistogram(SOM->getCaseMatcher(i), OpcodeFreq);
    } else if (const SwitchTypeMatcher *STM = dyn_cast<SwitchTypeMatcher>(M)) {
      for (unsigned i = 0, e = STM->getNumCases(); i != e; ++i)
        BuildHistogram(STM->getCaseMatcher(i), OpcodeFreq);
    }
  }
}

void MatcherTableEmitter::EmitHistogram(const Matcher *M,
                                        formatted_raw_ostream &OS) {
  if (OmitComments)
    return;

  std::vector<unsigned> OpcodeFreq;
  BuildHistogram(M, OpcodeFreq);

  OS << "  // Opcode Histogram:\n";
  for (unsigned i = 0, e = OpcodeFreq.size(); i != e; ++i) {
    OS << "  // #";
    switch ((Matcher::KindTy)i) {
    case Matcher::Scope: OS << "OPC_Scope"; break;
    case Matcher::RecordNode: OS << "OPC_RecordNode"; break;
    case Matcher::RecordChild: OS << "OPC_RecordChild"; break;
    case Matcher::RecordMemRef: OS << "OPC_RecordMemRef"; break;
    case Matcher::CaptureGlueInput: OS << "OPC_CaptureGlueInput"; break;
    case Matcher::MoveChild: OS << "OPC_MoveChild"; break;
    case Matcher::MoveParent: OS << "OPC_MoveParent"; break;
    case Matcher::CheckSame: OS << "OPC_CheckSame"; break;
    case Matcher::CheckChildSame: OS << "OPC_CheckChildSame"; break;
    case Matcher::CheckPatternPredicate:
      OS << "OPC_CheckPatternPredicate"; break;
    case Matcher::CheckPredicate: OS << "OPC_CheckPredicate"; break;
    case Matcher::CheckOpcode: OS << "OPC_CheckOpcode"; break;
    case Matcher::SwitchOpcode: OS << "OPC_SwitchOpcode"; break;
    case Matcher::CheckType: OS << "OPC_CheckType"; break;
    case Matcher::SwitchType: OS << "OPC_SwitchType"; break;
    case Matcher::CheckChildType: OS << "OPC_CheckChildType"; break;
    case Matcher::CheckInteger: OS << "OPC_CheckInteger"; break;
    case Matcher::CheckChildInteger: OS << "OPC_CheckChildInteger"; break;
    case Matcher::CheckCondCode: OS << "OPC_CheckCondCode"; break;
    case Matcher::CheckValueType: OS << "OPC_CheckValueType"; break;
    case Matcher::CheckComplexPat: OS << "OPC_CheckComplexPat"; break;
    case Matcher::CheckAndImm: OS << "OPC_CheckAndImm"; break;
    case Matcher::CheckOrImm: OS << "OPC_CheckOrImm"; break;
    case Matcher::CheckFoldableChainNode:
      OS << "OPC_CheckFoldableChainNode"; break;
    case Matcher::EmitInteger: OS << "OPC_EmitInteger"; break;
    case Matcher::EmitStringInteger: OS << "OPC_EmitStringInteger"; break;
    case Matcher::EmitRegister: OS << "OPC_EmitRegister"; break;
    case Matcher::EmitConvertToTarget: OS << "OPC_EmitConvertToTarget"; break;
    case Matcher::EmitMergeInputChains: OS << "OPC_EmitMergeInputChains"; break;
    case Matcher::EmitCopyToReg: OS << "OPC_EmitCopyToReg"; break;
    case Matcher::EmitNode: OS << "OPC_EmitNode"; break;
    case Matcher::MorphNodeTo: OS << "OPC_MorphNodeTo"; break;
    case Matcher::EmitNodeXForm: OS << "OPC_EmitNodeXForm"; break;
    case Matcher::MarkGlueResults: OS << "OPC_MarkGlueResults"; break;
    case Matcher::CompleteMatch: OS << "OPC_CompleteMatch"; break;
    }

    OS.PadToColumn(40) << " = " << OpcodeFreq[i] << '\n';
  }
  OS << '\n';
}


void llvm::EmitMatcherTable(const Matcher *TheMatcher,
                            const CodeGenDAGPatterns &CGP,
                            raw_ostream &O) {
  formatted_raw_ostream OS(O);

  OS << "// The main instruction selector code.\n";
  OS << "SDNode *SelectCode(SDNode *N) {\n";

  MatcherTableEmitter MatcherEmitter(CGP);

  OS << "  // Some target values are emitted as 2 bytes, TARGET_VAL handles\n";
  OS << "  // this.\n";
  OS << "  #define TARGET_VAL(X) X & 255, unsigned(X) >> 8\n";
  OS << "  static const unsigned char MatcherTable[] = {\n";
  unsigned TotalSize = MatcherEmitter.EmitMatcherList(TheMatcher, 6, 0, OS);
  OS << "    0\n  }; // Total Array size is " << (TotalSize+1) << " bytes\n\n";

  MatcherEmitter.EmitHistogram(TheMatcher, OS);

  OS << "  #undef TARGET_VAL\n";
  OS << "  return SelectCodeCommon(N, MatcherTable,sizeof(MatcherTable));\n}\n";
  OS << '\n';

  // Next up, emit the function for node and pattern predicates:
  MatcherEmitter.EmitPredicateFunctions(OS);
}