aboutsummaryrefslogtreecommitdiffstats
path: root/lib/Target/Hexagon/HexagonInstrInfo.cpp
blob: 1688c4ad3fb364a615afb4d13810ba2459c69f04 (plain)
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
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
//===-- HexagonInstrInfo.cpp - Hexagon Instruction Information ------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Hexagon implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#include "HexagonInstrInfo.h"
#include "Hexagon.h"
#include "HexagonRegisterInfo.h"
#include "HexagonSubtarget.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/DFAPacketizer.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

#define DEBUG_TYPE "hexagon-instrinfo"

#define GET_INSTRINFO_CTOR_DTOR
#define GET_INSTRMAP_INFO
#include "HexagonGenInstrInfo.inc"
#include "HexagonGenDFAPacketizer.inc"

///
/// Constants for Hexagon instructions.
///
const int Hexagon_MEMW_OFFSET_MAX = 4095;
const int Hexagon_MEMW_OFFSET_MIN = -4096;
const int Hexagon_MEMD_OFFSET_MAX = 8191;
const int Hexagon_MEMD_OFFSET_MIN = -8192;
const int Hexagon_MEMH_OFFSET_MAX = 2047;
const int Hexagon_MEMH_OFFSET_MIN = -2048;
const int Hexagon_MEMB_OFFSET_MAX = 1023;
const int Hexagon_MEMB_OFFSET_MIN = -1024;
const int Hexagon_ADDI_OFFSET_MAX = 32767;
const int Hexagon_ADDI_OFFSET_MIN = -32768;
const int Hexagon_MEMD_AUTOINC_MAX = 56;
const int Hexagon_MEMD_AUTOINC_MIN = -64;
const int Hexagon_MEMW_AUTOINC_MAX = 28;
const int Hexagon_MEMW_AUTOINC_MIN = -32;
const int Hexagon_MEMH_AUTOINC_MAX = 14;
const int Hexagon_MEMH_AUTOINC_MIN = -16;
const int Hexagon_MEMB_AUTOINC_MAX = 7;
const int Hexagon_MEMB_AUTOINC_MIN = -8;

// Pin the vtable to this file.
void HexagonInstrInfo::anchor() {}

HexagonInstrInfo::HexagonInstrInfo(HexagonSubtarget &ST)
  : HexagonGenInstrInfo(Hexagon::ADJCALLSTACKDOWN, Hexagon::ADJCALLSTACKUP),
    RI(ST), Subtarget(ST) {
}


/// isLoadFromStackSlot - If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot.  If
/// not, return 0.  This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
unsigned HexagonInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
                                             int &FrameIndex) const {


  switch (MI->getOpcode()) {
  default: break;
  case Hexagon::LDriw:
  case Hexagon::LDrid:
  case Hexagon::LDrih:
  case Hexagon::LDrib:
  case Hexagon::LDriub:
    if (MI->getOperand(2).isFI() &&
        MI->getOperand(1).isImm() && (MI->getOperand(1).getImm() == 0)) {
      FrameIndex = MI->getOperand(2).getIndex();
      return MI->getOperand(0).getReg();
    }
    break;
  }
  return 0;
}


/// isStoreToStackSlot - If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot.  If
/// not, return 0.  This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
unsigned HexagonInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
                                            int &FrameIndex) const {
  switch (MI->getOpcode()) {
  default: break;
  case Hexagon::STriw:
  case Hexagon::STrid:
  case Hexagon::STrih:
  case Hexagon::STrib:
    if (MI->getOperand(2).isFI() &&
        MI->getOperand(1).isImm() && (MI->getOperand(1).getImm() == 0)) {
      FrameIndex = MI->getOperand(0).getIndex();
      return MI->getOperand(2).getReg();
    }
    break;
  }
  return 0;
}


unsigned
HexagonInstrInfo::InsertBranch(MachineBasicBlock &MBB,MachineBasicBlock *TBB,
                             MachineBasicBlock *FBB,
                             const SmallVectorImpl<MachineOperand> &Cond,
                             DebugLoc DL) const{

    int BOpc   = Hexagon::JMP;
    int BccOpc = Hexagon::JMP_t;

    assert(TBB && "InsertBranch must not be told to insert a fallthrough");

    int regPos = 0;
    // Check if ReverseBranchCondition has asked to reverse this branch
    // If we want to reverse the branch an odd number of times, we want
    // JMP_f.
    if (!Cond.empty() && Cond[0].isImm() && Cond[0].getImm() == 0) {
      BccOpc = Hexagon::JMP_f;
      regPos = 1;
    }

    if (!FBB) {
      if (Cond.empty()) {
        // Due to a bug in TailMerging/CFG Optimization, we need to add a
        // special case handling of a predicated jump followed by an
        // unconditional jump. If not, Tail Merging and CFG Optimization go
        // into an infinite loop.
        MachineBasicBlock *NewTBB, *NewFBB;
        SmallVector<MachineOperand, 4> Cond;
        MachineInstr *Term = MBB.getFirstTerminator();
        if (isPredicated(Term) && !AnalyzeBranch(MBB, NewTBB, NewFBB, Cond,
                                                 false)) {
          MachineBasicBlock *NextBB =
            std::next(MachineFunction::iterator(&MBB));
          if (NewTBB == NextBB) {
            ReverseBranchCondition(Cond);
            RemoveBranch(MBB);
            return InsertBranch(MBB, TBB, nullptr, Cond, DL);
          }
        }
        BuildMI(&MBB, DL, get(BOpc)).addMBB(TBB);
      } else {
        BuildMI(&MBB, DL,
                get(BccOpc)).addReg(Cond[regPos].getReg()).addMBB(TBB);
      }
      return 1;
    }

    BuildMI(&MBB, DL, get(BccOpc)).addReg(Cond[regPos].getReg()).addMBB(TBB);
    BuildMI(&MBB, DL, get(BOpc)).addMBB(FBB);

    return 2;
}


bool HexagonInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
                                     MachineBasicBlock *&TBB,
                                 MachineBasicBlock *&FBB,
                                 SmallVectorImpl<MachineOperand> &Cond,
                                 bool AllowModify) const {
  TBB = nullptr;
  FBB = nullptr;

  // If the block has no terminators, it just falls into the block after it.
  MachineBasicBlock::instr_iterator I = MBB.instr_end();
  if (I == MBB.instr_begin())
    return false;

  // A basic block may looks like this:
  //
  //  [   insn
  //     EH_LABEL
  //      insn
  //      insn
  //      insn
  //     EH_LABEL
  //      insn     ]
  //
  // It has two succs but does not have a terminator
  // Don't know how to handle it.
  do {
    --I;
    if (I->isEHLabel())
      return true;
  } while (I != MBB.instr_begin());

  I = MBB.instr_end();
  --I;

  while (I->isDebugValue()) {
    if (I == MBB.instr_begin())
      return false;
    --I;
  }

  // Delete the JMP if it's equivalent to a fall-through.
  if (AllowModify && I->getOpcode() == Hexagon::JMP &&
      MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
    DEBUG(dbgs()<< "\nErasing the jump to successor block\n";);
    I->eraseFromParent();
    I = MBB.instr_end();
    if (I == MBB.instr_begin())
      return false;
    --I;
  }
  if (!isUnpredicatedTerminator(I))
    return false;

  // Get the last instruction in the block.
  MachineInstr *LastInst = I;
  MachineInstr *SecondLastInst = nullptr;
  // Find one more terminator if present.
  do {
    if (&*I != LastInst && !I->isBundle() && isUnpredicatedTerminator(I)) {
      if (!SecondLastInst)
        SecondLastInst = I;
      else
        // This is a third branch.
        return true;
    }
    if (I == MBB.instr_begin())
      break;
    --I;
  } while(I);

  int LastOpcode = LastInst->getOpcode();

  bool LastOpcodeHasJMP_c = PredOpcodeHasJMP_c(LastOpcode);
  bool LastOpcodeHasNot = PredOpcodeHasNot(LastOpcode);

  // If there is only one terminator instruction, process it.
  if (LastInst && !SecondLastInst) {
    if (LastOpcode == Hexagon::JMP) {
      TBB = LastInst->getOperand(0).getMBB();
      return false;
    }
    if (LastOpcode == Hexagon::ENDLOOP0) {
      TBB = LastInst->getOperand(0).getMBB();
      Cond.push_back(LastInst->getOperand(0));
      return false;
    }
    if (LastOpcodeHasJMP_c) {
      TBB = LastInst->getOperand(1).getMBB();
      if (LastOpcodeHasNot) {
        Cond.push_back(MachineOperand::CreateImm(0));
      }
      Cond.push_back(LastInst->getOperand(0));
      return false;
    }
    // Otherwise, don't know what this is.
    return true;
  }

  int SecLastOpcode = SecondLastInst->getOpcode();

  bool SecLastOpcodeHasJMP_c = PredOpcodeHasJMP_c(SecLastOpcode);
  bool SecLastOpcodeHasNot = PredOpcodeHasNot(SecLastOpcode);
  if (SecLastOpcodeHasJMP_c && (LastOpcode == Hexagon::JMP)) {
    TBB =  SecondLastInst->getOperand(1).getMBB();
    if (SecLastOpcodeHasNot)
      Cond.push_back(MachineOperand::CreateImm(0));
    Cond.push_back(SecondLastInst->getOperand(0));
    FBB = LastInst->getOperand(0).getMBB();
    return false;
  }

  // If the block ends with two Hexagon:JMPs, handle it.  The second one is not
  // executed, so remove it.
  if (SecLastOpcode == Hexagon::JMP && LastOpcode == Hexagon::JMP) {
    TBB = SecondLastInst->getOperand(0).getMBB();
    I = LastInst;
    if (AllowModify)
      I->eraseFromParent();
    return false;
  }

  // If the block ends with an ENDLOOP, and JMP, handle it.
  if (SecLastOpcode == Hexagon::ENDLOOP0 &&
      LastOpcode == Hexagon::JMP) {
    TBB = SecondLastInst->getOperand(0).getMBB();
    Cond.push_back(SecondLastInst->getOperand(0));
    FBB = LastInst->getOperand(0).getMBB();
    return false;
  }

  // Otherwise, can't handle this.
  return true;
}


unsigned HexagonInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
  int BOpc   = Hexagon::JMP;
  int BccOpc = Hexagon::JMP_t;
  int BccOpcNot = Hexagon::JMP_f;

  MachineBasicBlock::iterator I = MBB.end();
  if (I == MBB.begin()) return 0;
  --I;
  if (I->getOpcode() != BOpc && I->getOpcode() != BccOpc &&
      I->getOpcode() != BccOpcNot)
    return 0;

  // Remove the branch.
  I->eraseFromParent();

  I = MBB.end();

  if (I == MBB.begin()) return 1;
  --I;
  if (I->getOpcode() != BccOpc && I->getOpcode() != BccOpcNot)
    return 1;

  // Remove the branch.
  I->eraseFromParent();
  return 2;
}


/// \brief For a comparison instruction, return the source registers in
/// \p SrcReg and \p SrcReg2 if having two register operands, and the value it
/// compares against in CmpValue. Return true if the comparison instruction
/// can be analyzed.
bool HexagonInstrInfo::analyzeCompare(const MachineInstr *MI,
                                      unsigned &SrcReg, unsigned &SrcReg2,
                                      int &Mask, int &Value) const {
  unsigned Opc = MI->getOpcode();

  // Set mask and the first source register.
  switch (Opc) {
    case Hexagon::CMPEHexagon4rr:
    case Hexagon::CMPEQri:
    case Hexagon::CMPEQrr:
    case Hexagon::CMPGT64rr:
    case Hexagon::CMPGTU64rr:
    case Hexagon::CMPGTUri:
    case Hexagon::CMPGTUrr:
    case Hexagon::CMPGTri:
    case Hexagon::CMPGTrr:
      SrcReg = MI->getOperand(1).getReg();
      Mask = ~0;
      break;
    case Hexagon::CMPbEQri_V4:
    case Hexagon::CMPbEQrr_sbsb_V4:
    case Hexagon::CMPbEQrr_ubub_V4:
    case Hexagon::CMPbGTUri_V4:
    case Hexagon::CMPbGTUrr_V4:
    case Hexagon::CMPbGTrr_V4:
      SrcReg = MI->getOperand(1).getReg();
      Mask = 0xFF;
      break;
    case Hexagon::CMPhEQri_V4:
    case Hexagon::CMPhEQrr_shl_V4:
    case Hexagon::CMPhEQrr_xor_V4:
    case Hexagon::CMPhGTUri_V4:
    case Hexagon::CMPhGTUrr_V4:
    case Hexagon::CMPhGTrr_shl_V4:
      SrcReg = MI->getOperand(1).getReg();
      Mask = 0xFFFF;
      break;
  }

  // Set the value/second source register.
  switch (Opc) {
    case Hexagon::CMPEHexagon4rr:
    case Hexagon::CMPEQrr:
    case Hexagon::CMPGT64rr:
    case Hexagon::CMPGTU64rr:
    case Hexagon::CMPGTUrr:
    case Hexagon::CMPGTrr:
    case Hexagon::CMPbEQrr_sbsb_V4:
    case Hexagon::CMPbEQrr_ubub_V4:
    case Hexagon::CMPbGTUrr_V4:
    case Hexagon::CMPbGTrr_V4:
    case Hexagon::CMPhEQrr_shl_V4:
    case Hexagon::CMPhEQrr_xor_V4:
    case Hexagon::CMPhGTUrr_V4:
    case Hexagon::CMPhGTrr_shl_V4:
      SrcReg2 = MI->getOperand(2).getReg();
      return true;

    case Hexagon::CMPEQri:
    case Hexagon::CMPGTUri:
    case Hexagon::CMPGTri:
    case Hexagon::CMPbEQri_V4:
    case Hexagon::CMPbGTUri_V4:
    case Hexagon::CMPhEQri_V4:
    case Hexagon::CMPhGTUri_V4:
      SrcReg2 = 0;
      Value = MI->getOperand(2).getImm();
      return true;
  }

  return false;
}


void HexagonInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
                                 MachineBasicBlock::iterator I, DebugLoc DL,
                                 unsigned DestReg, unsigned SrcReg,
                                 bool KillSrc) const {
  if (Hexagon::IntRegsRegClass.contains(SrcReg, DestReg)) {
    BuildMI(MBB, I, DL, get(Hexagon::TFR), DestReg).addReg(SrcReg);
    return;
  }
  if (Hexagon::DoubleRegsRegClass.contains(SrcReg, DestReg)) {
    BuildMI(MBB, I, DL, get(Hexagon::TFR64), DestReg).addReg(SrcReg);
    return;
  }
  if (Hexagon::PredRegsRegClass.contains(SrcReg, DestReg)) {
    // Map Pd = Ps to Pd = or(Ps, Ps).
    BuildMI(MBB, I, DL, get(Hexagon::OR_pp),
            DestReg).addReg(SrcReg).addReg(SrcReg);
    return;
  }
  if (Hexagon::DoubleRegsRegClass.contains(DestReg) &&
      Hexagon::IntRegsRegClass.contains(SrcReg)) {
    // We can have an overlap between single and double reg: r1:0 = r0.
    if(SrcReg == RI.getSubReg(DestReg, Hexagon::subreg_loreg)) {
        // r1:0 = r0
        BuildMI(MBB, I, DL, get(Hexagon::TFRI), (RI.getSubReg(DestReg,
                Hexagon::subreg_hireg))).addImm(0);
    } else {
        // r1:0 = r1 or no overlap.
        BuildMI(MBB, I, DL, get(Hexagon::TFR), (RI.getSubReg(DestReg,
                Hexagon::subreg_loreg))).addReg(SrcReg);
        BuildMI(MBB, I, DL, get(Hexagon::TFRI), (RI.getSubReg(DestReg,
                Hexagon::subreg_hireg))).addImm(0);
    }
    return;
  }
  if (Hexagon::CRRegsRegClass.contains(DestReg) &&
      Hexagon::IntRegsRegClass.contains(SrcReg)) {
    BuildMI(MBB, I, DL, get(Hexagon::TFCR), DestReg).addReg(SrcReg);
    return;
  }
  if (Hexagon::PredRegsRegClass.contains(SrcReg) &&
      Hexagon::IntRegsRegClass.contains(DestReg)) {
    BuildMI(MBB, I, DL, get(Hexagon::TFR_RsPd), DestReg).
      addReg(SrcReg, getKillRegState(KillSrc));
    return;
  }
  if (Hexagon::IntRegsRegClass.contains(SrcReg) &&
      Hexagon::PredRegsRegClass.contains(DestReg)) {
    BuildMI(MBB, I, DL, get(Hexagon::TFR_PdRs), DestReg).
      addReg(SrcReg, getKillRegState(KillSrc));
    return;
  }

  llvm_unreachable("Unimplemented");
}


void HexagonInstrInfo::
storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                    unsigned SrcReg, bool isKill, int FI,
                    const TargetRegisterClass *RC,
                    const TargetRegisterInfo *TRI) const {

  DebugLoc DL = MBB.findDebugLoc(I);
  MachineFunction &MF = *MBB.getParent();
  MachineFrameInfo &MFI = *MF.getFrameInfo();
  unsigned Align = MFI.getObjectAlignment(FI);

  MachineMemOperand *MMO =
      MF.getMachineMemOperand(
                      MachinePointerInfo(PseudoSourceValue::getFixedStack(FI)),
                      MachineMemOperand::MOStore,
                      MFI.getObjectSize(FI),
                      Align);

  if (Hexagon::IntRegsRegClass.hasSubClassEq(RC)) {
    BuildMI(MBB, I, DL, get(Hexagon::STriw))
          .addFrameIndex(FI).addImm(0)
          .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
  } else if (Hexagon::DoubleRegsRegClass.hasSubClassEq(RC)) {
    BuildMI(MBB, I, DL, get(Hexagon::STrid))
          .addFrameIndex(FI).addImm(0)
          .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
  } else if (Hexagon::PredRegsRegClass.hasSubClassEq(RC)) {
    BuildMI(MBB, I, DL, get(Hexagon::STriw_pred))
          .addFrameIndex(FI).addImm(0)
          .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
  } else {
    llvm_unreachable("Unimplemented");
  }
}


void HexagonInstrInfo::storeRegToAddr(
                                 MachineFunction &MF, unsigned SrcReg,
                                 bool isKill,
                                 SmallVectorImpl<MachineOperand> &Addr,
                                 const TargetRegisterClass *RC,
                                 SmallVectorImpl<MachineInstr*> &NewMIs) const
{
  llvm_unreachable("Unimplemented");
}


void HexagonInstrInfo::
loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                     unsigned DestReg, int FI,
                     const TargetRegisterClass *RC,
                     const TargetRegisterInfo *TRI) const {
  DebugLoc DL = MBB.findDebugLoc(I);
  MachineFunction &MF = *MBB.getParent();
  MachineFrameInfo &MFI = *MF.getFrameInfo();
  unsigned Align = MFI.getObjectAlignment(FI);

  MachineMemOperand *MMO =
      MF.getMachineMemOperand(
                      MachinePointerInfo(PseudoSourceValue::getFixedStack(FI)),
                      MachineMemOperand::MOLoad,
                      MFI.getObjectSize(FI),
                      Align);
  if (RC == &Hexagon::IntRegsRegClass) {
    BuildMI(MBB, I, DL, get(Hexagon::LDriw), DestReg)
          .addFrameIndex(FI).addImm(0).addMemOperand(MMO);
  } else if (RC == &Hexagon::DoubleRegsRegClass) {
    BuildMI(MBB, I, DL, get(Hexagon::LDrid), DestReg)
          .addFrameIndex(FI).addImm(0).addMemOperand(MMO);
  } else if (RC == &Hexagon::PredRegsRegClass) {
    BuildMI(MBB, I, DL, get(Hexagon::LDriw_pred), DestReg)
          .addFrameIndex(FI).addImm(0).addMemOperand(MMO);
  } else {
    llvm_unreachable("Can't store this register to stack slot");
  }
}


void HexagonInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
                                        SmallVectorImpl<MachineOperand> &Addr,
                                        const TargetRegisterClass *RC,
                                 SmallVectorImpl<MachineInstr*> &NewMIs) const {
  llvm_unreachable("Unimplemented");
}


MachineInstr *HexagonInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
                                                    MachineInstr* MI,
                                          const SmallVectorImpl<unsigned> &Ops,
                                                    int FI) const {
  // Hexagon_TODO: Implement.
  return nullptr;
}

unsigned HexagonInstrInfo::createVR(MachineFunction* MF, MVT VT) const {

  MachineRegisterInfo &RegInfo = MF->getRegInfo();
  const TargetRegisterClass *TRC;
  if (VT == MVT::i1) {
    TRC = &Hexagon::PredRegsRegClass;
  } else if (VT == MVT::i32 || VT == MVT::f32) {
    TRC = &Hexagon::IntRegsRegClass;
  } else if (VT == MVT::i64 || VT == MVT::f64) {
    TRC = &Hexagon::DoubleRegsRegClass;
  } else {
    llvm_unreachable("Cannot handle this register class");
  }

  unsigned NewReg = RegInfo.createVirtualRegister(TRC);
  return NewReg;
}

bool HexagonInstrInfo::isExtendable(const MachineInstr *MI) const {
  // Constant extenders are allowed only for V4 and above.
  if (!Subtarget.hasV4TOps())
    return false;

  const MCInstrDesc &MID = MI->getDesc();
  const uint64_t F = MID.TSFlags;
  if ((F >> HexagonII::ExtendablePos) & HexagonII::ExtendableMask)
    return true;

  // TODO: This is largely obsolete now. Will need to be removed
  // in consecutive patches.
  switch(MI->getOpcode()) {
    // TFR_FI Remains a special case.
    case Hexagon::TFR_FI:
      return true;
    default:
      return false;
  }
  return  false;
}

// This returns true in two cases:
// - The OP code itself indicates that this is an extended instruction.
// - One of MOs has been marked with HMOTF_ConstExtended flag.
bool HexagonInstrInfo::isExtended(const MachineInstr *MI) const {
  // First check if this is permanently extended op code.
  const uint64_t F = MI->getDesc().TSFlags;
  if ((F >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask)
    return true;
  // Use MO operand flags to determine if one of MI's operands
  // has HMOTF_ConstExtended flag set.
  for (MachineInstr::const_mop_iterator I = MI->operands_begin(),
       E = MI->operands_end(); I != E; ++I) {
    if (I->getTargetFlags() && HexagonII::HMOTF_ConstExtended)
      return true;
  }
  return  false;
}

bool HexagonInstrInfo::isBranch (const MachineInstr *MI) const {
  return MI->getDesc().isBranch();
}

bool HexagonInstrInfo::isNewValueInst(const MachineInstr *MI) const {
  if (isNewValueJump(MI))
    return true;

  if (isNewValueStore(MI))
    return true;

  return false;
}

bool HexagonInstrInfo::isSaveCalleeSavedRegsCall(const MachineInstr *MI) const {
  return MI->getOpcode() == Hexagon::SAVE_REGISTERS_CALL_V4;
}

bool HexagonInstrInfo::isPredicable(MachineInstr *MI) const {
  bool isPred = MI->getDesc().isPredicable();

  if (!isPred)
    return false;

  const int Opc = MI->getOpcode();

  switch(Opc) {
  case Hexagon::TFRI:
    return isInt<12>(MI->getOperand(1).getImm());

  case Hexagon::STrid:
  case Hexagon::STrid_indexed:
    return isShiftedUInt<6,3>(MI->getOperand(1).getImm());

  case Hexagon::STriw:
  case Hexagon::STriw_indexed:
  case Hexagon::STriw_nv_V4:
    return isShiftedUInt<6,2>(MI->getOperand(1).getImm());

  case Hexagon::STrih:
  case Hexagon::STrih_indexed:
  case Hexagon::STrih_nv_V4:
    return isShiftedUInt<6,1>(MI->getOperand(1).getImm());

  case Hexagon::STrib:
  case Hexagon::STrib_indexed:
  case Hexagon::STrib_nv_V4:
    return isUInt<6>(MI->getOperand(1).getImm());

  case Hexagon::LDrid:
  case Hexagon::LDrid_indexed:
    return isShiftedUInt<6,3>(MI->getOperand(2).getImm());

  case Hexagon::LDriw:
  case Hexagon::LDriw_indexed:
    return isShiftedUInt<6,2>(MI->getOperand(2).getImm());

  case Hexagon::LDrih:
  case Hexagon::LDriuh:
  case Hexagon::LDrih_indexed:
  case Hexagon::LDriuh_indexed:
    return isShiftedUInt<6,1>(MI->getOperand(2).getImm());

  case Hexagon::LDrib:
  case Hexagon::LDriub:
  case Hexagon::LDrib_indexed:
  case Hexagon::LDriub_indexed:
    return isUInt<6>(MI->getOperand(2).getImm());

  case Hexagon::POST_LDrid:
    return isShiftedInt<4,3>(MI->getOperand(3).getImm());

  case Hexagon::POST_LDriw:
    return isShiftedInt<4,2>(MI->getOperand(3).getImm());

  case Hexagon::POST_LDrih:
  case Hexagon::POST_LDriuh:
    return isShiftedInt<4,1>(MI->getOperand(3).getImm());

  case Hexagon::POST_LDrib:
  case Hexagon::POST_LDriub:
    return isInt<4>(MI->getOperand(3).getImm());

  case Hexagon::STrib_imm_V4:
  case Hexagon::STrih_imm_V4:
  case Hexagon::STriw_imm_V4:
    return (isUInt<6>(MI->getOperand(1).getImm()) &&
            isInt<6>(MI->getOperand(2).getImm()));

  case Hexagon::ADD_ri:
    return isInt<8>(MI->getOperand(2).getImm());

  case Hexagon::ASLH:
  case Hexagon::ASRH:
  case Hexagon::SXTB:
  case Hexagon::SXTH:
  case Hexagon::ZXTB:
  case Hexagon::ZXTH:
    return Subtarget.hasV4TOps();
  }

  return true;
}

// This function performs the following inversiones:
//
//  cPt    ---> cNotPt
//  cNotPt ---> cPt
//
unsigned HexagonInstrInfo::getInvertedPredicatedOpcode(const int Opc) const {
  int InvPredOpcode;
  InvPredOpcode = isPredicatedTrue(Opc) ? Hexagon::getFalsePredOpcode(Opc)
                                        : Hexagon::getTruePredOpcode(Opc);
  if (InvPredOpcode >= 0) // Valid instruction with the inverted predicate.
    return InvPredOpcode;

  switch(Opc) {
    default: llvm_unreachable("Unexpected predicated instruction");
    case Hexagon::COMBINE_rr_cPt:
      return Hexagon::COMBINE_rr_cNotPt;
    case Hexagon::COMBINE_rr_cNotPt:
      return Hexagon::COMBINE_rr_cPt;

      // Dealloc_return.
    case Hexagon::DEALLOC_RET_cPt_V4:
      return Hexagon::DEALLOC_RET_cNotPt_V4;
    case Hexagon::DEALLOC_RET_cNotPt_V4:
      return Hexagon::DEALLOC_RET_cPt_V4;
  }
}

// New Value Store instructions.
bool HexagonInstrInfo::isNewValueStore(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;

  return ((F >> HexagonII::NVStorePos) & HexagonII::NVStoreMask);
}

bool HexagonInstrInfo::isNewValueStore(unsigned Opcode) const {
  const uint64_t F = get(Opcode).TSFlags;

  return ((F >> HexagonII::NVStorePos) & HexagonII::NVStoreMask);
}

int HexagonInstrInfo::
getMatchingCondBranchOpcode(int Opc, bool invertPredicate) const {
  enum Hexagon::PredSense inPredSense;
  inPredSense = invertPredicate ? Hexagon::PredSense_false :
                                  Hexagon::PredSense_true;
  int CondOpcode = Hexagon::getPredOpcode(Opc, inPredSense);
  if (CondOpcode >= 0) // Valid Conditional opcode/instruction
    return CondOpcode;

  // This switch case will be removed once all the instructions have been
  // modified to use relation maps.
  switch(Opc) {
  case Hexagon::TFRI_f:
    return !invertPredicate ? Hexagon::TFRI_cPt_f :
                              Hexagon::TFRI_cNotPt_f;
  case Hexagon::COMBINE_rr:
    return !invertPredicate ? Hexagon::COMBINE_rr_cPt :
                              Hexagon::COMBINE_rr_cNotPt;

  // Word.
  case Hexagon::STriw_f:
    return !invertPredicate ? Hexagon::STriw_cPt :
                              Hexagon::STriw_cNotPt;
  case Hexagon::STriw_indexed_f:
    return !invertPredicate ? Hexagon::STriw_indexed_cPt :
                              Hexagon::STriw_indexed_cNotPt;

  // DEALLOC_RETURN.
  case Hexagon::DEALLOC_RET_V4:
    return !invertPredicate ? Hexagon::DEALLOC_RET_cPt_V4 :
                              Hexagon::DEALLOC_RET_cNotPt_V4;
  }
  llvm_unreachable("Unexpected predicable instruction");
}


bool HexagonInstrInfo::
PredicateInstruction(MachineInstr *MI,
                     const SmallVectorImpl<MachineOperand> &Cond) const {
  int Opc = MI->getOpcode();
  assert (isPredicable(MI) && "Expected predicable instruction");
  bool invertJump = (!Cond.empty() && Cond[0].isImm() &&
                     (Cond[0].getImm() == 0));

  // This will change MI's opcode to its predicate version.
  // However, its operand list is still the old one, i.e. the
  // non-predicate one.
  MI->setDesc(get(getMatchingCondBranchOpcode(Opc, invertJump)));

  int oper = -1;
  unsigned int GAIdx = 0;

  // Indicates whether the current MI has a GlobalAddress operand
  bool hasGAOpnd = false;
  std::vector<MachineOperand> tmpOpnds;

  // Indicates whether we need to shift operands to right.
  bool needShift = true;

  // The predicate is ALWAYS the FIRST input operand !!!
  if (MI->getNumOperands() == 0) {
    // The non-predicate version of MI does not take any operands,
    // i.e. no outs and no ins. In this condition, the predicate
    // operand will be directly placed at Operands[0]. No operand
    // shift is needed.
    // Example: BARRIER
    needShift = false;
    oper = -1;
  }
  else if (   MI->getOperand(MI->getNumOperands()-1).isReg()
           && MI->getOperand(MI->getNumOperands()-1).isDef()
           && !MI->getOperand(MI->getNumOperands()-1).isImplicit()) {
    // The non-predicate version of MI does not have any input operands.
    // In this condition, we extend the length of Operands[] by one and
    // copy the original last operand to the newly allocated slot.
    // At this moment, it is just a place holder. Later, we will put
    // predicate operand directly into it. No operand shift is needed.
    // Example: r0=BARRIER (this is a faked insn used here for illustration)
    MI->addOperand(MI->getOperand(MI->getNumOperands()-1));
    needShift = false;
    oper = MI->getNumOperands() - 2;
  }
  else {
    // We need to right shift all input operands by one. Duplicate the
    // last operand into the newly allocated slot.
    MI->addOperand(MI->getOperand(MI->getNumOperands()-1));
  }

  if (needShift)
  {
    // Operands[ MI->getNumOperands() - 2 ] has been copied into
    // Operands[ MI->getNumOperands() - 1 ], so we start from
    // Operands[ MI->getNumOperands() - 3 ].
    // oper is a signed int.
    // It is ok if "MI->getNumOperands()-3" is -3, -2, or -1.
    for (oper = MI->getNumOperands() - 3; oper >= 0; --oper)
    {
      MachineOperand &MO = MI->getOperand(oper);

      // Opnd[0] Opnd[1] Opnd[2] Opnd[3] Opnd[4]   Opnd[5]   Opnd[6]   Opnd[7]
      // <Def0>  <Def1>  <Use0>  <Use1>  <ImpDef0> <ImpDef1> <ImpUse0> <ImpUse1>
      //               /\~
      //              /||\~
      //               ||
      //        Predicate Operand here
      if (MO.isReg() && !MO.isUse() && !MO.isImplicit()) {
        break;
      }
      if (MO.isReg()) {
        MI->getOperand(oper+1).ChangeToRegister(MO.getReg(), MO.isDef(),
                                                MO.isImplicit(), MO.isKill(),
                                                MO.isDead(), MO.isUndef(),
                                                MO.isDebug());
      }
      else if (MO.isImm()) {
        MI->getOperand(oper+1).ChangeToImmediate(MO.getImm());
      }
      else if (MO.isGlobal()) {
        // MI can not have more than one GlobalAddress operand.
        assert(hasGAOpnd == false && "MI can only have one GlobalAddress opnd");

        // There is no member function called "ChangeToGlobalAddress" in the
        // MachineOperand class (not like "ChangeToRegister" and
        // "ChangeToImmediate"). So we have to remove them from Operands[] list
        // first, and then add them back after we have inserted the predicate
        // operand. tmpOpnds[] is to remember these operands before we remove
        // them.
        tmpOpnds.push_back(MO);

        // Operands[oper] is a GlobalAddress operand;
        // Operands[oper+1] has been copied into Operands[oper+2];
        hasGAOpnd = true;
        GAIdx = oper;
        continue;
      }
      else {
        assert(false && "Unexpected operand type");
      }
    }
  }

  int regPos = invertJump ? 1 : 0;
  MachineOperand PredMO = Cond[regPos];

  // [oper] now points to the last explicit Def. Predicate operand must be
  // located at [oper+1]. See diagram above.
  // This assumes that the predicate is always the first operand,
  // i.e. Operands[0+numResults], in the set of inputs
  // It is better to have an assert here to check this. But I don't know how
  // to write this assert because findFirstPredOperandIdx() would return -1
  if (oper < -1) oper = -1;

  MI->getOperand(oper+1).ChangeToRegister(PredMO.getReg(), PredMO.isDef(),
                                          PredMO.isImplicit(), false,
                                          PredMO.isDead(), PredMO.isUndef(),
                                          PredMO.isDebug());

  MachineRegisterInfo &RegInfo = MI->getParent()->getParent()->getRegInfo();
  RegInfo.clearKillFlags(PredMO.getReg());

  if (hasGAOpnd)
  {
    unsigned int i;

    // Operands[GAIdx] is the original GlobalAddress operand, which is
    // already copied into tmpOpnds[0].
    // Operands[GAIdx] now stores a copy of Operands[GAIdx-1]
    // Operands[GAIdx+1] has already been copied into Operands[GAIdx+2],
    // so we start from [GAIdx+2]
    for (i = GAIdx + 2; i < MI->getNumOperands(); ++i)
      tmpOpnds.push_back(MI->getOperand(i));

    // Remove all operands in range [ (GAIdx+1) ... (MI->getNumOperands()-1) ]
    // It is very important that we always remove from the end of Operands[]
    // MI->getNumOperands() is at least 2 if program goes to here.
    for (i = MI->getNumOperands() - 1; i > GAIdx; --i)
      MI->RemoveOperand(i);

    for (i = 0; i < tmpOpnds.size(); ++i)
      MI->addOperand(tmpOpnds[i]);
  }

  return true;
}


bool
HexagonInstrInfo::
isProfitableToIfCvt(MachineBasicBlock &MBB,
                    unsigned NumCycles,
                    unsigned ExtraPredCycles,
                    const BranchProbability &Probability) const {
  return true;
}


bool
HexagonInstrInfo::
isProfitableToIfCvt(MachineBasicBlock &TMBB,
                    unsigned NumTCycles,
                    unsigned ExtraTCycles,
                    MachineBasicBlock &FMBB,
                    unsigned NumFCycles,
                    unsigned ExtraFCycles,
                    const BranchProbability &Probability) const {
  return true;
}

// Returns true if an instruction is predicated irrespective of the predicate
// sense. For example, all of the following will return true.
// if (p0) R1 = add(R2, R3)
// if (!p0) R1 = add(R2, R3)
// if (p0.new) R1 = add(R2, R3)
// if (!p0.new) R1 = add(R2, R3)
bool HexagonInstrInfo::isPredicated(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;

  return ((F >> HexagonII::PredicatedPos) & HexagonII::PredicatedMask);
}

bool HexagonInstrInfo::isPredicated(unsigned Opcode) const {
  const uint64_t F = get(Opcode).TSFlags;

  return ((F >> HexagonII::PredicatedPos) & HexagonII::PredicatedMask);
}

bool HexagonInstrInfo::isPredicatedTrue(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;

  assert(isPredicated(MI));
  return (!((F >> HexagonII::PredicatedFalsePos) &
            HexagonII::PredicatedFalseMask));
}

bool HexagonInstrInfo::isPredicatedTrue(unsigned Opcode) const {
  const uint64_t F = get(Opcode).TSFlags;

  // Make sure that the instruction is predicated.
  assert((F>> HexagonII::PredicatedPos) & HexagonII::PredicatedMask);
  return (!((F >> HexagonII::PredicatedFalsePos) &
            HexagonII::PredicatedFalseMask));
}

bool HexagonInstrInfo::isPredicatedNew(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;

  assert(isPredicated(MI));
  return ((F >> HexagonII::PredicatedNewPos) & HexagonII::PredicatedNewMask);
}

bool HexagonInstrInfo::isPredicatedNew(unsigned Opcode) const {
  const uint64_t F = get(Opcode).TSFlags;

  assert(isPredicated(Opcode));
  return ((F >> HexagonII::PredicatedNewPos) & HexagonII::PredicatedNewMask);
}

// Returns true, if a ST insn can be promoted to a new-value store.
bool HexagonInstrInfo::mayBeNewStore(const MachineInstr *MI) const {
  const HexagonRegisterInfo& QRI = getRegisterInfo();
  const uint64_t F = MI->getDesc().TSFlags;

  return ((F >> HexagonII::mayNVStorePos) &
           HexagonII::mayNVStoreMask &
           QRI.Subtarget.hasV4TOps());
}

bool
HexagonInstrInfo::DefinesPredicate(MachineInstr *MI,
                                   std::vector<MachineOperand> &Pred) const {
  for (unsigned oper = 0; oper < MI->getNumOperands(); ++oper) {
    MachineOperand MO = MI->getOperand(oper);
    if (MO.isReg() && MO.isDef()) {
      const TargetRegisterClass* RC = RI.getMinimalPhysRegClass(MO.getReg());
      if (RC == &Hexagon::PredRegsRegClass) {
        Pred.push_back(MO);
        return true;
      }
    }
  }
  return false;
}


bool
HexagonInstrInfo::
SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
                  const SmallVectorImpl<MachineOperand> &Pred2) const {
  // TODO: Fix this
  return false;
}


//
// We indicate that we want to reverse the branch by
// inserting a 0 at the beginning of the Cond vector.
//
bool HexagonInstrInfo::
ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
  if (!Cond.empty() && Cond[0].isImm() && Cond[0].getImm() == 0) {
    Cond.erase(Cond.begin());
  } else {
    Cond.insert(Cond.begin(), MachineOperand::CreateImm(0));
  }
  return false;
}


bool HexagonInstrInfo::
isProfitableToDupForIfCvt(MachineBasicBlock &MBB,unsigned NumInstrs,
                          const BranchProbability &Probability) const {
  return (NumInstrs <= 4);
}

bool HexagonInstrInfo::isDeallocRet(const MachineInstr *MI) const {
  switch (MI->getOpcode()) {
  default: return false;
  case Hexagon::DEALLOC_RET_V4 :
  case Hexagon::DEALLOC_RET_cPt_V4 :
  case Hexagon::DEALLOC_RET_cNotPt_V4 :
  case Hexagon::DEALLOC_RET_cdnPnt_V4 :
  case Hexagon::DEALLOC_RET_cNotdnPnt_V4 :
  case Hexagon::DEALLOC_RET_cdnPt_V4 :
  case Hexagon::DEALLOC_RET_cNotdnPt_V4 :
   return true;
  }
}


bool HexagonInstrInfo::
isValidOffset(const int Opcode, const int Offset) const {
  // This function is to check whether the "Offset" is in the correct range of
  // the given "Opcode". If "Offset" is not in the correct range, "ADD_ri" is
  // inserted to calculate the final address. Due to this reason, the function
  // assumes that the "Offset" has correct alignment.
  // We used to assert if the offset was not properly aligned, however,
  // there are cases where a misaligned pointer recast can cause this
  // problem, and we need to allow for it. The front end warns of such
  // misaligns with respect to load size.

  switch(Opcode) {

  case Hexagon::LDriw:
  case Hexagon::LDriw_indexed:
  case Hexagon::LDriw_f:
  case Hexagon::STriw_indexed:
  case Hexagon::STriw:
  case Hexagon::STriw_f:
    return (Offset >= Hexagon_MEMW_OFFSET_MIN) &&
      (Offset <= Hexagon_MEMW_OFFSET_MAX);

  case Hexagon::LDrid:
  case Hexagon::LDrid_indexed:
  case Hexagon::LDrid_f:
  case Hexagon::STrid:
  case Hexagon::STrid_indexed:
  case Hexagon::STrid_f:
    return (Offset >= Hexagon_MEMD_OFFSET_MIN) &&
      (Offset <= Hexagon_MEMD_OFFSET_MAX);

  case Hexagon::LDrih:
  case Hexagon::LDriuh:
  case Hexagon::STrih:
    return (Offset >= Hexagon_MEMH_OFFSET_MIN) &&
      (Offset <= Hexagon_MEMH_OFFSET_MAX);

  case Hexagon::LDrib:
  case Hexagon::STrib:
  case Hexagon::LDriub:
    return (Offset >= Hexagon_MEMB_OFFSET_MIN) &&
      (Offset <= Hexagon_MEMB_OFFSET_MAX);

  case Hexagon::ADD_ri:
  case Hexagon::TFR_FI:
    return (Offset >= Hexagon_ADDI_OFFSET_MIN) &&
      (Offset <= Hexagon_ADDI_OFFSET_MAX);

  case Hexagon::MemOPw_ADDi_V4 :
  case Hexagon::MemOPw_SUBi_V4 :
  case Hexagon::MemOPw_ADDr_V4 :
  case Hexagon::MemOPw_SUBr_V4 :
  case Hexagon::MemOPw_ANDr_V4 :
  case Hexagon::MemOPw_ORr_V4 :
    return (0 <= Offset && Offset <= 255);

  case Hexagon::MemOPh_ADDi_V4 :
  case Hexagon::MemOPh_SUBi_V4 :
  case Hexagon::MemOPh_ADDr_V4 :
  case Hexagon::MemOPh_SUBr_V4 :
  case Hexagon::MemOPh_ANDr_V4 :
  case Hexagon::MemOPh_ORr_V4 :
    return (0 <= Offset && Offset <= 127);

  case Hexagon::MemOPb_ADDi_V4 :
  case Hexagon::MemOPb_SUBi_V4 :
  case Hexagon::MemOPb_ADDr_V4 :
  case Hexagon::MemOPb_SUBr_V4 :
  case Hexagon::MemOPb_ANDr_V4 :
  case Hexagon::MemOPb_ORr_V4 :
    return (0 <= Offset && Offset <= 63);

  // LDri_pred and STriw_pred are pseudo operations, so it has to take offset of
  // any size. Later pass knows how to handle it.
  case Hexagon::STriw_pred:
  case Hexagon::LDriw_pred:
    return true;

  case Hexagon::LOOP0_i:
    return isUInt<10>(Offset);

  // INLINEASM is very special.
  case Hexagon::INLINEASM:
    return true;
  }

  llvm_unreachable("No offset range is defined for this opcode. "
                   "Please define it in the above switch statement!");
}


//
// Check if the Offset is a valid auto-inc imm by Load/Store Type.
//
bool HexagonInstrInfo::
isValidAutoIncImm(const EVT VT, const int Offset) const {

  if (VT == MVT::i64) {
      return (Offset >= Hexagon_MEMD_AUTOINC_MIN &&
              Offset <= Hexagon_MEMD_AUTOINC_MAX &&
              (Offset & 0x7) == 0);
  }
  if (VT == MVT::i32) {
      return (Offset >= Hexagon_MEMW_AUTOINC_MIN &&
              Offset <= Hexagon_MEMW_AUTOINC_MAX &&
              (Offset & 0x3) == 0);
  }
  if (VT == MVT::i16) {
      return (Offset >= Hexagon_MEMH_AUTOINC_MIN &&
              Offset <= Hexagon_MEMH_AUTOINC_MAX &&
              (Offset & 0x1) == 0);
  }
  if (VT == MVT::i8) {
      return (Offset >= Hexagon_MEMB_AUTOINC_MIN &&
              Offset <= Hexagon_MEMB_AUTOINC_MAX);
  }
  llvm_unreachable("Not an auto-inc opc!");
}


bool HexagonInstrInfo::
isMemOp(const MachineInstr *MI) const {
//  return MI->getDesc().mayLoad() && MI->getDesc().mayStore();

  switch (MI->getOpcode())
  {
    default: return false;
    case Hexagon::MemOPw_ADDi_V4 :
    case Hexagon::MemOPw_SUBi_V4 :
    case Hexagon::MemOPw_ADDr_V4 :
    case Hexagon::MemOPw_SUBr_V4 :
    case Hexagon::MemOPw_ANDr_V4 :
    case Hexagon::MemOPw_ORr_V4 :
    case Hexagon::MemOPh_ADDi_V4 :
    case Hexagon::MemOPh_SUBi_V4 :
    case Hexagon::MemOPh_ADDr_V4 :
    case Hexagon::MemOPh_SUBr_V4 :
    case Hexagon::MemOPh_ANDr_V4 :
    case Hexagon::MemOPh_ORr_V4 :
    case Hexagon::MemOPb_ADDi_V4 :
    case Hexagon::MemOPb_SUBi_V4 :
    case Hexagon::MemOPb_ADDr_V4 :
    case Hexagon::MemOPb_SUBr_V4 :
    case Hexagon::MemOPb_ANDr_V4 :
    case Hexagon::MemOPb_ORr_V4 :
    case Hexagon::MemOPb_SETBITi_V4:
    case Hexagon::MemOPh_SETBITi_V4:
    case Hexagon::MemOPw_SETBITi_V4:
    case Hexagon::MemOPb_CLRBITi_V4:
    case Hexagon::MemOPh_CLRBITi_V4:
    case Hexagon::MemOPw_CLRBITi_V4:
    return true;
  }
  return false;
}


bool HexagonInstrInfo::
isSpillPredRegOp(const MachineInstr *MI) const {
  switch (MI->getOpcode()) {
    default: return false;
    case Hexagon::STriw_pred :
    case Hexagon::LDriw_pred :
      return true;
  }
}

bool HexagonInstrInfo::isNewValueJumpCandidate(const MachineInstr *MI) const {
  switch (MI->getOpcode()) {
    default: return false;
    case Hexagon::CMPEQrr:
    case Hexagon::CMPEQri:
    case Hexagon::CMPGTrr:
    case Hexagon::CMPGTri:
    case Hexagon::CMPGTUrr:
    case Hexagon::CMPGTUri:
      return true;
  }
}

bool HexagonInstrInfo::
isConditionalTransfer (const MachineInstr *MI) const {
  switch (MI->getOpcode()) {
    default: return false;
    case Hexagon::TFR_cPt:
    case Hexagon::TFR_cNotPt:
    case Hexagon::TFRI_cPt:
    case Hexagon::TFRI_cNotPt:
    case Hexagon::TFR_cdnPt:
    case Hexagon::TFR_cdnNotPt:
    case Hexagon::TFRI_cdnPt:
    case Hexagon::TFRI_cdnNotPt:
      return true;
  }
}

bool HexagonInstrInfo::isConditionalALU32 (const MachineInstr* MI) const {
  const HexagonRegisterInfo& QRI = getRegisterInfo();
  switch (MI->getOpcode())
  {
    default: return false;
    case Hexagon::A2_paddf:
    case Hexagon::A2_paddfnew:
    case Hexagon::A2_paddt:
    case Hexagon::A2_paddtnew:
    case Hexagon::A2_pandf:
    case Hexagon::A2_pandfnew:
    case Hexagon::A2_pandt:
    case Hexagon::A2_pandtnew:
    case Hexagon::A2_porf:
    case Hexagon::A2_porfnew:
    case Hexagon::A2_port:
    case Hexagon::A2_portnew:
    case Hexagon::A2_pxorf:
    case Hexagon::A2_pxorfnew:
    case Hexagon::A2_pxort:
    case Hexagon::A2_pxortnew:
    case Hexagon::ADD_ri_cPt:
    case Hexagon::ADD_ri_cNotPt:
    case Hexagon::SUB_rr_cPt:
    case Hexagon::SUB_rr_cNotPt:
    case Hexagon::COMBINE_rr_cPt:
    case Hexagon::COMBINE_rr_cNotPt:
      return true;
    case Hexagon::ASLH_cPt_V4:
    case Hexagon::ASLH_cNotPt_V4:
    case Hexagon::ASRH_cPt_V4:
    case Hexagon::ASRH_cNotPt_V4:
    case Hexagon::SXTB_cPt_V4:
    case Hexagon::SXTB_cNotPt_V4:
    case Hexagon::SXTH_cPt_V4:
    case Hexagon::SXTH_cNotPt_V4:
    case Hexagon::ZXTB_cPt_V4:
    case Hexagon::ZXTB_cNotPt_V4:
    case Hexagon::ZXTH_cPt_V4:
    case Hexagon::ZXTH_cNotPt_V4:
      return QRI.Subtarget.hasV4TOps();
  }
}

bool HexagonInstrInfo::
isConditionalLoad (const MachineInstr* MI) const {
  const HexagonRegisterInfo& QRI = getRegisterInfo();
  switch (MI->getOpcode())
  {
    default: return false;
    case Hexagon::LDrid_cPt :
    case Hexagon::LDrid_cNotPt :
    case Hexagon::LDrid_indexed_cPt :
    case Hexagon::LDrid_indexed_cNotPt :
    case Hexagon::LDriw_cPt :
    case Hexagon::LDriw_cNotPt :
    case Hexagon::LDriw_indexed_cPt :
    case Hexagon::LDriw_indexed_cNotPt :
    case Hexagon::LDrih_cPt :
    case Hexagon::LDrih_cNotPt :
    case Hexagon::LDrih_indexed_cPt :
    case Hexagon::LDrih_indexed_cNotPt :
    case Hexagon::LDrib_cPt :
    case Hexagon::LDrib_cNotPt :
    case Hexagon::LDrib_indexed_cPt :
    case Hexagon::LDrib_indexed_cNotPt :
    case Hexagon::LDriuh_cPt :
    case Hexagon::LDriuh_cNotPt :
    case Hexagon::LDriuh_indexed_cPt :
    case Hexagon::LDriuh_indexed_cNotPt :
    case Hexagon::LDriub_cPt :
    case Hexagon::LDriub_cNotPt :
    case Hexagon::LDriub_indexed_cPt :
    case Hexagon::LDriub_indexed_cNotPt :
      return true;
    case Hexagon::POST_LDrid_cPt :
    case Hexagon::POST_LDrid_cNotPt :
    case Hexagon::POST_LDriw_cPt :
    case Hexagon::POST_LDriw_cNotPt :
    case Hexagon::POST_LDrih_cPt :
    case Hexagon::POST_LDrih_cNotPt :
    case Hexagon::POST_LDrib_cPt :
    case Hexagon::POST_LDrib_cNotPt :
    case Hexagon::POST_LDriuh_cPt :
    case Hexagon::POST_LDriuh_cNotPt :
    case Hexagon::POST_LDriub_cPt :
    case Hexagon::POST_LDriub_cNotPt :
      return QRI.Subtarget.hasV4TOps();
    case Hexagon::LDrid_indexed_shl_cPt_V4 :
    case Hexagon::LDrid_indexed_shl_cNotPt_V4 :
    case Hexagon::LDrib_indexed_shl_cPt_V4 :
    case Hexagon::LDrib_indexed_shl_cNotPt_V4 :
    case Hexagon::LDriub_indexed_shl_cPt_V4 :
    case Hexagon::LDriub_indexed_shl_cNotPt_V4 :
    case Hexagon::LDrih_indexed_shl_cPt_V4 :
    case Hexagon::LDrih_indexed_shl_cNotPt_V4 :
    case Hexagon::LDriuh_indexed_shl_cPt_V4 :
    case Hexagon::LDriuh_indexed_shl_cNotPt_V4 :
    case Hexagon::LDriw_indexed_shl_cPt_V4 :
    case Hexagon::LDriw_indexed_shl_cNotPt_V4 :
      return QRI.Subtarget.hasV4TOps();
  }
}

// Returns true if an instruction is a conditional store.
//
// Note: It doesn't include conditional new-value stores as they can't be
// converted to .new predicate.
//
//               p.new NV store [ if(p0.new)memw(R0+#0)=R2.new ]
//                ^           ^
//               /             \ (not OK. it will cause new-value store to be
//              /               X conditional on p0.new while R2 producer is
//             /                 \ on p0)
//            /                   \.
//     p.new store                 p.old NV store
// [if(p0.new)memw(R0+#0)=R2]    [if(p0)memw(R0+#0)=R2.new]
//            ^                  ^
//             \                /
//              \              /
//               \            /
//                 p.old store
//             [if (p0)memw(R0+#0)=R2]
//
// The above diagram shows the steps involoved in the conversion of a predicated
// store instruction to its .new predicated new-value form.
//
// The following set of instructions further explains the scenario where
// conditional new-value store becomes invalid when promoted to .new predicate
// form.
//
// { 1) if (p0) r0 = add(r1, r2)
//   2) p0 = cmp.eq(r3, #0) }
//
//   3) if (p0) memb(r1+#0) = r0  --> this instruction can't be grouped with
// the first two instructions because in instr 1, r0 is conditional on old value
// of p0 but its use in instr 3 is conditional on p0 modified by instr 2 which
// is not valid for new-value stores.
bool HexagonInstrInfo::
isConditionalStore (const MachineInstr* MI) const {
  const HexagonRegisterInfo& QRI = getRegisterInfo();
  switch (MI->getOpcode())
  {
    default: return false;
    case Hexagon::STrib_imm_cPt_V4 :
    case Hexagon::STrib_imm_cNotPt_V4 :
    case Hexagon::STrib_indexed_shl_cPt_V4 :
    case Hexagon::STrib_indexed_shl_cNotPt_V4 :
    case Hexagon::STrib_cPt :
    case Hexagon::STrib_cNotPt :
    case Hexagon::POST_STbri_cPt :
    case Hexagon::POST_STbri_cNotPt :
    case Hexagon::STrid_indexed_cPt :
    case Hexagon::STrid_indexed_cNotPt :
    case Hexagon::STrid_indexed_shl_cPt_V4 :
    case Hexagon::POST_STdri_cPt :
    case Hexagon::POST_STdri_cNotPt :
    case Hexagon::STrih_cPt :
    case Hexagon::STrih_cNotPt :
    case Hexagon::STrih_indexed_cPt :
    case Hexagon::STrih_indexed_cNotPt :
    case Hexagon::STrih_imm_cPt_V4 :
    case Hexagon::STrih_imm_cNotPt_V4 :
    case Hexagon::STrih_indexed_shl_cPt_V4 :
    case Hexagon::STrih_indexed_shl_cNotPt_V4 :
    case Hexagon::POST_SThri_cPt :
    case Hexagon::POST_SThri_cNotPt :
    case Hexagon::STriw_cPt :
    case Hexagon::STriw_cNotPt :
    case Hexagon::STriw_indexed_cPt :
    case Hexagon::STriw_indexed_cNotPt :
    case Hexagon::STriw_imm_cPt_V4 :
    case Hexagon::STriw_imm_cNotPt_V4 :
    case Hexagon::STriw_indexed_shl_cPt_V4 :
    case Hexagon::STriw_indexed_shl_cNotPt_V4 :
    case Hexagon::POST_STwri_cPt :
    case Hexagon::POST_STwri_cNotPt :
      return QRI.Subtarget.hasV4TOps();

    // V4 global address store before promoting to dot new.
    case Hexagon::STd_GP_cPt_V4 :
    case Hexagon::STd_GP_cNotPt_V4 :
    case Hexagon::STb_GP_cPt_V4 :
    case Hexagon::STb_GP_cNotPt_V4 :
    case Hexagon::STh_GP_cPt_V4 :
    case Hexagon::STh_GP_cNotPt_V4 :
    case Hexagon::STw_GP_cPt_V4 :
    case Hexagon::STw_GP_cNotPt_V4 :
      return QRI.Subtarget.hasV4TOps();

    // Predicated new value stores (i.e. if (p0) memw(..)=r0.new) are excluded
    // from the "Conditional Store" list. Because a predicated new value store
    // would NOT be promoted to a double dot new store. See diagram below:
    // This function returns yes for those stores that are predicated but not
    // yet promoted to predicate dot new instructions.
    //
    //                          +---------------------+
    //                    /-----| if (p0) memw(..)=r0 |---------\~
    //                   ||     +---------------------+         ||
    //          promote  ||       /\       /\                   ||  promote
    //                   ||      /||\     /||\                  ||
    //                  \||/    demote     ||                  \||/
    //                   \/       ||       ||                   \/
    //       +-------------------------+   ||   +-------------------------+
    //       | if (p0.new) memw(..)=r0 |   ||   | if (p0) memw(..)=r0.new |
    //       +-------------------------+   ||   +-------------------------+
    //                        ||           ||         ||
    //                        ||         demote      \||/
    //                      promote        ||         \/ NOT possible
    //                        ||           ||         /\~
    //                       \||/          ||        /||\~
    //                        \/           ||         ||
    //                      +-----------------------------+
    //                      | if (p0.new) memw(..)=r0.new |
    //                      +-----------------------------+
    //                           Double Dot New Store
    //
  }
}


bool HexagonInstrInfo::isNewValueJump(const MachineInstr *MI) const {
  if (isNewValue(MI) && isBranch(MI))
    return true;
  return false;
}

bool HexagonInstrInfo::isPostIncrement (const MachineInstr* MI) const {
  return (getAddrMode(MI) == HexagonII::PostInc);
}

bool HexagonInstrInfo::isNewValue(const MachineInstr* MI) const {
  const uint64_t F = MI->getDesc().TSFlags;
  return ((F >> HexagonII::NewValuePos) & HexagonII::NewValueMask);
}

// Returns true, if any one of the operands is a dot new
// insn, whether it is predicated dot new or register dot new.
bool HexagonInstrInfo::isDotNewInst (const MachineInstr* MI) const {
  return (isNewValueInst(MI) ||
     (isPredicated(MI) && isPredicatedNew(MI)));
}

// Returns the most basic instruction for the .new predicated instructions and
// new-value stores.
// For example, all of the following instructions will be converted back to the
// same instruction:
// 1) if (p0.new) memw(R0+#0) = R1.new  --->
// 2) if (p0) memw(R0+#0)= R1.new      -------> if (p0) memw(R0+#0) = R1
// 3) if (p0.new) memw(R0+#0) = R1      --->
//

int HexagonInstrInfo::GetDotOldOp(const int opc) const {
  int NewOp = opc;
  if (isPredicated(NewOp) && isPredicatedNew(NewOp)) { // Get predicate old form
    NewOp = Hexagon::getPredOldOpcode(NewOp);
    assert(NewOp >= 0 &&
           "Couldn't change predicate new instruction to its old form.");
  }

  if (isNewValueStore(NewOp)) { // Convert into non-new-value format
    NewOp = Hexagon::getNonNVStore(NewOp);
    assert(NewOp >= 0 && "Couldn't change new-value store to its old form.");
  }
  return NewOp;
}

// Return the new value instruction for a given store.
int HexagonInstrInfo::GetDotNewOp(const MachineInstr* MI) const {
  int NVOpcode = Hexagon::getNewValueOpcode(MI->getOpcode());
  if (NVOpcode >= 0) // Valid new-value store instruction.
    return NVOpcode;

  switch (MI->getOpcode()) {
  default: llvm_unreachable("Unknown .new type");
  // store new value byte
  case Hexagon::STrib_shl_V4:
    return Hexagon::STrib_shl_nv_V4;

  case Hexagon::STrih_shl_V4:
    return Hexagon::STrih_shl_nv_V4;

  case Hexagon::STriw_f:
    return Hexagon::STriw_nv_V4;

  case Hexagon::STriw_indexed_f:
    return Hexagon::STriw_indexed_nv_V4;

  case Hexagon::STriw_shl_V4:
    return Hexagon::STriw_shl_nv_V4;

  }
  return 0;
}

// Return .new predicate version for an instruction.
int HexagonInstrInfo::GetDotNewPredOp(MachineInstr *MI,
                                      const MachineBranchProbabilityInfo
                                      *MBPI) const {

  int NewOpcode = Hexagon::getPredNewOpcode(MI->getOpcode());
  if (NewOpcode >= 0) // Valid predicate new instruction
    return NewOpcode;

  switch (MI->getOpcode()) {
  default: llvm_unreachable("Unknown .new type");
  // Condtional Jumps
  case Hexagon::JMP_t:
  case Hexagon::JMP_f:
    return getDotNewPredJumpOp(MI, MBPI);

  case Hexagon::JMPR_t:
    return Hexagon::JMPR_tnew_tV3;

  case Hexagon::JMPR_f:
    return Hexagon::JMPR_fnew_tV3;

  case Hexagon::JMPret_t:
    return Hexagon::JMPret_tnew_tV3;

  case Hexagon::JMPret_f:
    return Hexagon::JMPret_fnew_tV3;


  // Conditional combine
  case Hexagon::COMBINE_rr_cPt :
    return Hexagon::COMBINE_rr_cdnPt;
  case Hexagon::COMBINE_rr_cNotPt :
    return Hexagon::COMBINE_rr_cdnNotPt;
  }
}


unsigned HexagonInstrInfo::getAddrMode(const MachineInstr* MI) const {
  const uint64_t F = MI->getDesc().TSFlags;

  return((F >> HexagonII::AddrModePos) & HexagonII::AddrModeMask);
}

/// immediateExtend - Changes the instruction in place to one using an immediate
/// extender.
void HexagonInstrInfo::immediateExtend(MachineInstr *MI) const {
  assert((isExtendable(MI)||isConstExtended(MI)) &&
                               "Instruction must be extendable");
  // Find which operand is extendable.
  short ExtOpNum = getCExtOpNum(MI);
  MachineOperand &MO = MI->getOperand(ExtOpNum);
  // This needs to be something we understand.
  assert((MO.isMBB() || MO.isImm()) &&
         "Branch with unknown extendable field type");
  // Mark given operand as extended.
  MO.addTargetFlag(HexagonII::HMOTF_ConstExtended);
}

DFAPacketizer *HexagonInstrInfo::CreateTargetScheduleState(
    const TargetSubtargetInfo &STI) const {
  const InstrItineraryData *II = STI.getInstrItineraryData();
  return static_cast<const HexagonSubtarget &>(STI).createDFAPacketizer(II);
}

bool HexagonInstrInfo::isSchedulingBoundary(const MachineInstr *MI,
                                            const MachineBasicBlock *MBB,
                                            const MachineFunction &MF) const {
  // Debug info is never a scheduling boundary. It's necessary to be explicit
  // due to the special treatment of IT instructions below, otherwise a
  // dbg_value followed by an IT will result in the IT instruction being
  // considered a scheduling hazard, which is wrong. It should be the actual
  // instruction preceding the dbg_value instruction(s), just like it is
  // when debug info is not present.
  if (MI->isDebugValue())
    return false;

  // Terminators and labels can't be scheduled around.
  if (MI->getDesc().isTerminator() || MI->isPosition() || MI->isInlineAsm())
    return true;

  return false;
}

bool HexagonInstrInfo::isConstExtended(MachineInstr *MI) const {

  // Constant extenders are allowed only for V4 and above.
  if (!Subtarget.hasV4TOps())
    return false;

  const uint64_t F = MI->getDesc().TSFlags;
  unsigned isExtended = (F >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask;
  if (isExtended) // Instruction must be extended.
    return true;

  unsigned isExtendable = (F >> HexagonII::ExtendablePos)
                          & HexagonII::ExtendableMask;
  if (!isExtendable)
    return false;

  short ExtOpNum = getCExtOpNum(MI);
  const MachineOperand &MO = MI->getOperand(ExtOpNum);
  // Use MO operand flags to determine if MO
  // has the HMOTF_ConstExtended flag set.
  if (MO.getTargetFlags() && HexagonII::HMOTF_ConstExtended)
    return true;
  // If this is a Machine BB address we are talking about, and it is
  // not marked as extended, say so.
  if (MO.isMBB())
    return false;

  // We could be using an instruction with an extendable immediate and shoehorn
  // a global address into it. If it is a global address it will be constant
  // extended. We do this for COMBINE.
  // We currently only handle isGlobal() because it is the only kind of
  // object we are going to end up with here for now.
  // In the future we probably should add isSymbol(), etc.
  if (MO.isGlobal() || MO.isSymbol())
    return true;

  // If the extendable operand is not 'Immediate' type, the instruction should
  // have 'isExtended' flag set.
  assert(MO.isImm() && "Extendable operand must be Immediate type");

  int MinValue = getMinValue(MI);
  int MaxValue = getMaxValue(MI);
  int ImmValue = MO.getImm();

  return (ImmValue < MinValue || ImmValue > MaxValue);
}

// Returns the opcode to use when converting MI, which is a conditional jump,
// into a conditional instruction which uses the .new value of the predicate.
// We also use branch probabilities to add a hint to the jump.
int
HexagonInstrInfo::getDotNewPredJumpOp(MachineInstr *MI,
                                  const
                                  MachineBranchProbabilityInfo *MBPI) const {

  // We assume that block can have at most two successors.
  bool taken = false;
  MachineBasicBlock *Src = MI->getParent();
  MachineOperand *BrTarget = &MI->getOperand(1);
  MachineBasicBlock *Dst = BrTarget->getMBB();

  const BranchProbability Prediction = MBPI->getEdgeProbability(Src, Dst);
  if (Prediction >= BranchProbability(1,2))
    taken = true;

  switch (MI->getOpcode()) {
  case Hexagon::JMP_t:
    return taken ? Hexagon::JMP_tnew_t : Hexagon::JMP_tnew_nt;
  case Hexagon::JMP_f:
    return taken ? Hexagon::JMP_fnew_t : Hexagon::JMP_fnew_nt;

  default:
    llvm_unreachable("Unexpected jump instruction.");
  }
}
// Returns true if a particular operand is extendable for an instruction.
bool HexagonInstrInfo::isOperandExtended(const MachineInstr *MI,
                                         unsigned short OperandNum) const {
  // Constant extenders are allowed only for V4 and above.
  if (!Subtarget.hasV4TOps())
    return false;

  const uint64_t F = MI->getDesc().TSFlags;

  return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask)
          == OperandNum;
}

// Returns Operand Index for the constant extended instruction.
unsigned short HexagonInstrInfo::getCExtOpNum(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;
  return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask);
}

// Returns the min value that doesn't need to be extended.
int HexagonInstrInfo::getMinValue(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;
  unsigned isSigned = (F >> HexagonII::ExtentSignedPos)
                    & HexagonII::ExtentSignedMask;
  unsigned bits =  (F >> HexagonII::ExtentBitsPos)
                    & HexagonII::ExtentBitsMask;

  if (isSigned) // if value is signed
    return -1U << (bits - 1);
  else
    return 0;
}

// Returns the max value that doesn't need to be extended.
int HexagonInstrInfo::getMaxValue(const MachineInstr *MI) const {
  const uint64_t F = MI->getDesc().TSFlags;
  unsigned isSigned = (F >> HexagonII::ExtentSignedPos)
                    & HexagonII::ExtentSignedMask;
  unsigned bits =  (F >> HexagonII::ExtentBitsPos)
                    & HexagonII::ExtentBitsMask;

  if (isSigned) // if value is signed
    return ~(-1U << (bits - 1));
  else
    return ~(-1U << bits);
}

// Returns true if an instruction can be converted into a non-extended
// equivalent instruction.
bool HexagonInstrInfo::NonExtEquivalentExists (const MachineInstr *MI) const {

  short NonExtOpcode;
  // Check if the instruction has a register form that uses register in place
  // of the extended operand, if so return that as the non-extended form.
  if (Hexagon::getRegForm(MI->getOpcode()) >= 0)
    return true;

  if (MI->getDesc().mayLoad() || MI->getDesc().mayStore()) {
    // Check addressing mode and retrieve non-ext equivalent instruction.

    switch (getAddrMode(MI)) {
    case HexagonII::Absolute :
      // Load/store with absolute addressing mode can be converted into
      // base+offset mode.
      NonExtOpcode = Hexagon::getBasedWithImmOffset(MI->getOpcode());
      break;
    case HexagonII::BaseImmOffset :
      // Load/store with base+offset addressing mode can be converted into
      // base+register offset addressing mode. However left shift operand should
      // be set to 0.
      NonExtOpcode = Hexagon::getBaseWithRegOffset(MI->getOpcode());
      break;
    default:
      return false;
    }
    if (NonExtOpcode < 0)
      return false;
    return true;
  }
  return false;
}

// Returns opcode of the non-extended equivalent instruction.
short HexagonInstrInfo::getNonExtOpcode (const MachineInstr *MI) const {

  // Check if the instruction has a register form that uses register in place
  // of the extended operand, if so return that as the non-extended form.
  short NonExtOpcode = Hexagon::getRegForm(MI->getOpcode());
    if (NonExtOpcode >= 0)
      return NonExtOpcode;

  if (MI->getDesc().mayLoad() || MI->getDesc().mayStore()) {
    // Check addressing mode and retrieve non-ext equivalent instruction.
    switch (getAddrMode(MI)) {
    case HexagonII::Absolute :
      return Hexagon::getBasedWithImmOffset(MI->getOpcode());
    case HexagonII::BaseImmOffset :
      return Hexagon::getBaseWithRegOffset(MI->getOpcode());
    default:
      return -1;
    }
  }
  return -1;
}

bool HexagonInstrInfo::PredOpcodeHasJMP_c(Opcode_t Opcode) const {
  return (Opcode == Hexagon::JMP_t) ||
         (Opcode == Hexagon::JMP_f) ||
         (Opcode == Hexagon::JMP_tnew_t) ||
         (Opcode == Hexagon::JMP_fnew_t) ||
         (Opcode == Hexagon::JMP_tnew_nt) ||
         (Opcode == Hexagon::JMP_fnew_nt);
}

bool HexagonInstrInfo::PredOpcodeHasNot(Opcode_t Opcode) const {
  return (Opcode == Hexagon::JMP_f) ||
         (Opcode == Hexagon::JMP_fnew_t) ||
         (Opcode == Hexagon::JMP_fnew_nt);
}