summaryrefslogtreecommitdiffstats
path: root/src/intel/compiler/brw_eu_compact.c
blob: 51dce9efbddc4eab0a763d0fd3c495cfd1fded80 (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
/*
 * Copyright © 2012 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

/** @file brw_eu_compact.c
 *
 * Instruction compaction is a feature of G45 and newer hardware that allows
 * for a smaller instruction encoding.
 *
 * The instruction cache is on the order of 32KB, and many programs generate
 * far more instructions than that.  The instruction cache is built to barely
 * keep up with instruction dispatch ability in cache hit cases -- L1
 * instruction cache misses that still hit in the next level could limit
 * throughput by around 50%.
 *
 * The idea of instruction compaction is that most instructions use a tiny
 * subset of the GPU functionality, so we can encode what would be a 16 byte
 * instruction in 8 bytes using some lookup tables for various fields.
 *
 *
 * Instruction compaction capabilities vary subtly by generation.
 *
 * G45's support for instruction compaction is very limited. Jump counts on
 * this generation are in units of 16-byte uncompacted instructions. As such,
 * all jump targets must be 16-byte aligned. Also, all instructions must be
 * naturally aligned, i.e. uncompacted instructions must be 16-byte aligned.
 * A G45-only instruction, NENOP, must be used to provide padding to align
 * uncompacted instructions.
 *
 * Gen5 removes these restrictions and changes jump counts to be in units of
 * 8-byte compacted instructions, allowing jump targets to be only 8-byte
 * aligned. Uncompacted instructions can also be placed on 8-byte boundaries.
 *
 * Gen6 adds the ability to compact instructions with a limited range of
 * immediate values. Compactable immediates have 12 unrestricted bits, and a
 * 13th bit that's replicated through the high 20 bits, to create the 32-bit
 * value of DW3 in the uncompacted instruction word.
 *
 * On Gen7 we can compact some control flow instructions with a small positive
 * immediate in the low bits of DW3, like ENDIF with the JIP field. Other
 * control flow instructions with UIP cannot be compacted, because of the
 * replicated 13th bit. No control flow instructions can be compacted on Gen6
 * since the jump count field is not in DW3.
 *
 *    break    JIP/UIP
 *    cont     JIP/UIP
 *    halt     JIP/UIP
 *    if       JIP/UIP
 *    else     JIP (plus UIP on BDW+)
 *    endif    JIP
 *    while    JIP (must be negative)
 *
 * Gen 8 adds support for compacting 3-src instructions.
 */

#include "brw_eu.h"
#include "brw_shader.h"
#include "brw_disasm_info.h"
#include "dev/gen_debug.h"

static const uint32_t g45_control_index_table[32] = {
   0b00000000000000000,
   0b01000000000000000,
   0b00110000000000000,
   0b00000000000000010,
   0b00100000000000000,
   0b00010000000000000,
   0b01000000000100000,
   0b01000000100000000,
   0b01010000000100000,
   0b00000000100000010,
   0b11000000000000000,
   0b00001000100000010,
   0b01001000100000000,
   0b00000000100000000,
   0b11000000000100000,
   0b00001000100000000,
   0b10110000000000000,
   0b11010000000100000,
   0b00110000100000000,
   0b00100000100000000,
   0b01000000000001000,
   0b01000000000000100,
   0b00111100000000000,
   0b00101011000000000,
   0b00110000000010000,
   0b00010000100000000,
   0b01000000000100100,
   0b01000000000101000,
   0b00110000000000110,
   0b00000000000001010,
   0b01010000000101000,
   0b01010000000100100,
};

static const uint32_t g45_datatype_table[32] = {
   0b001000000000100001,
   0b001011010110101101,
   0b001000001000110001,
   0b001111011110111101,
   0b001011010110101100,
   0b001000000110101101,
   0b001000000000100000,
   0b010100010110110001,
   0b001100011000101101,
   0b001000000000100010,
   0b001000001000110110,
   0b010000001000110001,
   0b001000001000110010,
   0b011000001000110010,
   0b001111011110111100,
   0b001000000100101000,
   0b010100011000110001,
   0b001010010100101001,
   0b001000001000101001,
   0b010000001000110110,
   0b101000001000110001,
   0b001011011000101101,
   0b001000000100001001,
   0b001011011000101100,
   0b110100011000110001,
   0b001000001110111101,
   0b110000001000110001,
   0b011000000100101010,
   0b101000001000101001,
   0b001011010110001100,
   0b001000000110100001,
   0b001010010100001000,
};

static const uint16_t g45_subreg_table[32] = {
   0b000000000000000,
   0b000000010000000,
   0b000001000000000,
   0b000100000000000,
   0b000000000100000,
   0b100000000000000,
   0b000000000010000,
   0b001100000000000,
   0b001010000000000,
   0b000000100000000,
   0b001000000000000,
   0b000000000001000,
   0b000000001000000,
   0b000000000000001,
   0b000010000000000,
   0b000000010100000,
   0b000000000000111,
   0b000001000100000,
   0b011000000000000,
   0b000000110000000,
   0b000000000000010,
   0b000000000000100,
   0b000000001100000,
   0b000100000000010,
   0b001110011000110,
   0b001110100001000,
   0b000110011000110,
   0b000001000011000,
   0b000110010000100,
   0b001100000000110,
   0b000000010000110,
   0b000001000110000,
};

static const uint16_t g45_src_index_table[32] = {
   0b000000000000,
   0b010001101000,
   0b010110001000,
   0b011010010000,
   0b001101001000,
   0b010110001010,
   0b010101110000,
   0b011001111000,
   0b001000101000,
   0b000000101000,
   0b010001010000,
   0b111101101100,
   0b010110001100,
   0b010001101100,
   0b011010010100,
   0b010001001100,
   0b001100101000,
   0b000000000010,
   0b111101001100,
   0b011001101000,
   0b010101001000,
   0b000000000100,
   0b000000101100,
   0b010001101010,
   0b000000111000,
   0b010101011000,
   0b000100100000,
   0b010110000000,
   0b010000000100,
   0b010000111000,
   0b000101100000,
   0b111101110100,
};

static const uint32_t gen6_control_index_table[32] = {
   0b00000000000000000,
   0b01000000000000000,
   0b00110000000000000,
   0b00000000100000000,
   0b00010000000000000,
   0b00001000100000000,
   0b00000000100000010,
   0b00000000000000010,
   0b01000000100000000,
   0b01010000000000000,
   0b10110000000000000,
   0b00100000000000000,
   0b11010000000000000,
   0b11000000000000000,
   0b01001000100000000,
   0b01000000000001000,
   0b01000000000000100,
   0b00000000000001000,
   0b00000000000000100,
   0b00111000100000000,
   0b00001000100000010,
   0b00110000100000000,
   0b00110000000000001,
   0b00100000000000001,
   0b00110000000000010,
   0b00110000000000101,
   0b00110000000001001,
   0b00110000000010000,
   0b00110000000000011,
   0b00110000000000100,
   0b00110000100001000,
   0b00100000000001001,
};

static const uint32_t gen6_datatype_table[32] = {
   0b001001110000000000,
   0b001000110000100000,
   0b001001110000000001,
   0b001000000001100000,
   0b001010110100101001,
   0b001000000110101101,
   0b001100011000101100,
   0b001011110110101101,
   0b001000000111101100,
   0b001000000001100001,
   0b001000110010100101,
   0b001000000001000001,
   0b001000001000110001,
   0b001000001000101001,
   0b001000000000100000,
   0b001000001000110010,
   0b001010010100101001,
   0b001011010010100101,
   0b001000000110100101,
   0b001100011000101001,
   0b001011011000101100,
   0b001011010110100101,
   0b001011110110100101,
   0b001111011110111101,
   0b001111011110111100,
   0b001111011110111101,
   0b001111011110011101,
   0b001111011110111110,
   0b001000000000100001,
   0b001000000000100010,
   0b001001111111011101,
   0b001000001110111110,
};

static const uint16_t gen6_subreg_table[32] = {
   0b000000000000000,
   0b000000000000100,
   0b000000110000000,
   0b111000000000000,
   0b011110000001000,
   0b000010000000000,
   0b000000000010000,
   0b000110000001100,
   0b001000000000000,
   0b000001000000000,
   0b000001010010100,
   0b000000001010110,
   0b010000000000000,
   0b110000000000000,
   0b000100000000000,
   0b000000010000000,
   0b000000000001000,
   0b100000000000000,
   0b000001010000000,
   0b001010000000000,
   0b001100000000000,
   0b000000001010100,
   0b101101010010100,
   0b010100000000000,
   0b000000010001111,
   0b011000000000000,
   0b111110000000000,
   0b101000000000000,
   0b000000000001111,
   0b000100010001111,
   0b001000010001111,
   0b000110000000000,
};

static const uint16_t gen6_src_index_table[32] = {
   0b000000000000,
   0b010110001000,
   0b010001101000,
   0b001000101000,
   0b011010010000,
   0b000100100000,
   0b010001101100,
   0b010101110000,
   0b011001111000,
   0b001100101000,
   0b010110001100,
   0b001000100000,
   0b010110001010,
   0b000000000010,
   0b010101010000,
   0b010101101000,
   0b111101001100,
   0b111100101100,
   0b011001110000,
   0b010110001001,
   0b010101011000,
   0b001101001000,
   0b010000101100,
   0b010000000000,
   0b001101110000,
   0b001100010000,
   0b001100000000,
   0b010001101010,
   0b001101111000,
   0b000001110000,
   0b001100100000,
   0b001101010000,
};

static const uint32_t gen7_control_index_table[32] = {
   0b0000000000000000010,
   0b0000100000000000000,
   0b0000100000000000001,
   0b0000100000000000010,
   0b0000100000000000011,
   0b0000100000000000100,
   0b0000100000000000101,
   0b0000100000000000111,
   0b0000100000000001000,
   0b0000100000000001001,
   0b0000100000000001101,
   0b0000110000000000000,
   0b0000110000000000001,
   0b0000110000000000010,
   0b0000110000000000011,
   0b0000110000000000100,
   0b0000110000000000101,
   0b0000110000000000111,
   0b0000110000000001001,
   0b0000110000000001101,
   0b0000110000000010000,
   0b0000110000100000000,
   0b0001000000000000000,
   0b0001000000000000010,
   0b0001000000000000100,
   0b0001000000100000000,
   0b0010110000000000000,
   0b0010110000000010000,
   0b0011000000000000000,
   0b0011000000100000000,
   0b0101000000000000000,
   0b0101000000100000000,
};

static const uint32_t gen7_datatype_table[32] = {
   0b001000000000000001,
   0b001000000000100000,
   0b001000000000100001,
   0b001000000001100001,
   0b001000000010111101,
   0b001000001011111101,
   0b001000001110100001,
   0b001000001110100101,
   0b001000001110111101,
   0b001000010000100001,
   0b001000110000100000,
   0b001000110000100001,
   0b001001010010100101,
   0b001001110010100100,
   0b001001110010100101,
   0b001111001110111101,
   0b001111011110011101,
   0b001111011110111100,
   0b001111011110111101,
   0b001111111110111100,
   0b000000001000001100,
   0b001000000000111101,
   0b001000000010100101,
   0b001000010000100000,
   0b001001010010100100,
   0b001001110010000100,
   0b001010010100001001,
   0b001101111110111101,
   0b001111111110111101,
   0b001011110110101100,
   0b001010010100101000,
   0b001010110100101000,
};

static const uint16_t gen7_subreg_table[32] = {
   0b000000000000000,
   0b000000000000001,
   0b000000000001000,
   0b000000000001111,
   0b000000000010000,
   0b000000010000000,
   0b000000100000000,
   0b000000110000000,
   0b000001000000000,
   0b000001000010000,
   0b000010100000000,
   0b001000000000000,
   0b001000000000001,
   0b001000010000001,
   0b001000010000010,
   0b001000010000011,
   0b001000010000100,
   0b001000010000111,
   0b001000010001000,
   0b001000010001110,
   0b001000010001111,
   0b001000110000000,
   0b001000111101000,
   0b010000000000000,
   0b010000110000000,
   0b011000000000000,
   0b011110010000111,
   0b100000000000000,
   0b101000000000000,
   0b110000000000000,
   0b111000000000000,
   0b111000000011100,
};

static const uint16_t gen7_src_index_table[32] = {
   0b000000000000,
   0b000000000010,
   0b000000010000,
   0b000000010010,
   0b000000011000,
   0b000000100000,
   0b000000101000,
   0b000001001000,
   0b000001010000,
   0b000001110000,
   0b000001111000,
   0b001100000000,
   0b001100000010,
   0b001100001000,
   0b001100010000,
   0b001100010010,
   0b001100100000,
   0b001100101000,
   0b001100111000,
   0b001101000000,
   0b001101000010,
   0b001101001000,
   0b001101010000,
   0b001101100000,
   0b001101101000,
   0b001101110000,
   0b001101110001,
   0b001101111000,
   0b010001101000,
   0b010001101001,
   0b010001101010,
   0b010110001000,
};

static const uint32_t gen8_control_index_table[32] = {
   0b0000000000000000010,
   0b0000100000000000000,
   0b0000100000000000001,
   0b0000100000000000010,
   0b0000100000000000011,
   0b0000100000000000100,
   0b0000100000000000101,
   0b0000100000000000111,
   0b0000100000000001000,
   0b0000100000000001001,
   0b0000100000000001101,
   0b0000110000000000000,
   0b0000110000000000001,
   0b0000110000000000010,
   0b0000110000000000011,
   0b0000110000000000100,
   0b0000110000000000101,
   0b0000110000000000111,
   0b0000110000000001001,
   0b0000110000000001101,
   0b0000110000000010000,
   0b0000110000100000000,
   0b0001000000000000000,
   0b0001000000000000010,
   0b0001000000000000100,
   0b0001000000100000000,
   0b0010110000000000000,
   0b0010110000000010000,
   0b0011000000000000000,
   0b0011000000100000000,
   0b0101000000000000000,
   0b0101000000100000000,
};

static const uint32_t gen8_datatype_table[32] = {
   0b001000000000000000001,
   0b001000000000001000000,
   0b001000000000001000001,
   0b001000000000011000001,
   0b001000000000101011101,
   0b001000000010111011101,
   0b001000000011101000001,
   0b001000000011101000101,
   0b001000000011101011101,
   0b001000001000001000001,
   0b001000011000001000000,
   0b001000011000001000001,
   0b001000101000101000101,
   0b001000111000101000100,
   0b001000111000101000101,
   0b001011100011101011101,
   0b001011101011100011101,
   0b001011101011101011100,
   0b001011101011101011101,
   0b001011111011101011100,
   0b000000000010000001100,
   0b001000000000001011101,
   0b001000000000101000101,
   0b001000001000001000000,
   0b001000101000101000100,
   0b001000111000100000100,
   0b001001001001000001001,
   0b001010111011101011101,
   0b001011111011101011101,
   0b001001111001101001100,
   0b001001001001001001000,
   0b001001011001001001000,
};

static const uint16_t gen8_subreg_table[32] = {
   0b000000000000000,
   0b000000000000001,
   0b000000000001000,
   0b000000000001111,
   0b000000000010000,
   0b000000010000000,
   0b000000100000000,
   0b000000110000000,
   0b000001000000000,
   0b000001000010000,
   0b000001010000000,
   0b001000000000000,
   0b001000000000001,
   0b001000010000001,
   0b001000010000010,
   0b001000010000011,
   0b001000010000100,
   0b001000010000111,
   0b001000010001000,
   0b001000010001110,
   0b001000010001111,
   0b001000110000000,
   0b001000111101000,
   0b010000000000000,
   0b010000110000000,
   0b011000000000000,
   0b011110010000111,
   0b100000000000000,
   0b101000000000000,
   0b110000000000000,
   0b111000000000000,
   0b111000000011100,
};

static const uint16_t gen8_src_index_table[32] = {
   0b000000000000,
   0b000000000010,
   0b000000010000,
   0b000000010010,
   0b000000011000,
   0b000000100000,
   0b000000101000,
   0b000001001000,
   0b000001010000,
   0b000001110000,
   0b000001111000,
   0b001100000000,
   0b001100000010,
   0b001100001000,
   0b001100010000,
   0b001100010010,
   0b001100100000,
   0b001100101000,
   0b001100111000,
   0b001101000000,
   0b001101000010,
   0b001101001000,
   0b001101010000,
   0b001101100000,
   0b001101101000,
   0b001101110000,
   0b001101110001,
   0b001101111000,
   0b010001101000,
   0b010001101001,
   0b010001101010,
   0b010110001000,
};

static const uint32_t gen11_datatype_table[32] = {
   0b001000000000000000001,
   0b001000000000001000000,
   0b001000000000001000001,
   0b001000000000011000001,
   0b001000000000101100101,
   0b001000000101111100101,
   0b001000000100101000001,
   0b001000000100101000101,
   0b001000000100101100101,
   0b001000001000001000001,
   0b001000011000001000000,
   0b001000011000001000001,
   0b001000101000101000101,
   0b001000111000101000100,
   0b001000111000101000101,
   0b001100100100101100101,
   0b001100101100100100101,
   0b001100101100101100100,
   0b001100101100101100101,
   0b001100111100101100100,
   0b000000000010000001100,
   0b001000000000001100101,
   0b001000000000101000101,
   0b001000001000001000000,
   0b001000101000101000100,
   0b001000111000100000100,
   0b001001001001000001001,
   0b001101111100101100101,
   0b001100111100101100101,
   0b001001111001101001100,
   0b001001001001001001000,
   0b001001011001001001000,
};

/* This is actually the control index table for Cherryview (26 bits), but the
 * only difference from Broadwell (24 bits) is that it has two extra 0-bits at
 * the start.
 *
 * The low 24 bits have the same mappings on both hardware.
 */
static const uint32_t gen8_3src_control_index_table[4] = {
   0b00100000000110000000000001,
   0b00000000000110000000000001,
   0b00000000001000000000000001,
   0b00000000001000000000100001,
};

/* This is actually the control index table for Cherryview (49 bits), but the
 * only difference from Broadwell (46 bits) is that it has three extra 0-bits
 * at the start.
 *
 * The low 44 bits have the same mappings on both hardware, and since the high
 * three bits on Broadwell are zero, we can reuse Cherryview's table.
 */
static const uint64_t gen8_3src_source_index_table[4] = {
   0b0000001110010011100100111001000001111000000000000,
   0b0000001110010011100100111001000001111000000000010,
   0b0000001110010011100100111001000001111000000001000,
   0b0000001110010011100100111001000001111000000100000,
};

static const uint32_t *control_index_table;
static const uint32_t *datatype_table;
static const uint16_t *subreg_table;
static const uint16_t *src_index_table;

static bool
set_control_index(const struct gen_device_info *devinfo,
                  brw_compact_inst *dst, const brw_inst *src)
{
   uint32_t uncompacted = devinfo->gen >= 8  /* 17b/G45; 19b/IVB+ */
      ? (brw_inst_bits(src, 33, 31) << 16) | /*  3b */
        (brw_inst_bits(src, 23, 12) <<  4) | /* 12b */
        (brw_inst_bits(src, 10,  9) <<  2) | /*  2b */
        (brw_inst_bits(src, 34, 34) <<  1) | /*  1b */
        (brw_inst_bits(src,  8,  8))         /*  1b */
      : (brw_inst_bits(src, 31, 31) << 16) | /*  1b */
        (brw_inst_bits(src, 23,  8));        /* 16b */

   /* On gen7, the flag register and subregister numbers are integrated into
    * the control index.
    */
   if (devinfo->gen == 7)
      uncompacted |= brw_inst_bits(src, 90, 89) << 17; /* 2b */

   for (int i = 0; i < 32; i++) {
      if (control_index_table[i] == uncompacted) {
         brw_compact_inst_set_control_index(devinfo, dst, i);
	 return true;
      }
   }

   return false;
}

static bool
set_datatype_index(const struct gen_device_info *devinfo, brw_compact_inst *dst,
                   const brw_inst *src)
{
   uint32_t uncompacted = devinfo->gen >= 8  /* 18b/G45+; 21b/BDW+ */
      ? (brw_inst_bits(src, 63, 61) << 18) | /*  3b */
        (brw_inst_bits(src, 94, 89) << 12) | /*  6b */
        (brw_inst_bits(src, 46, 35))         /* 12b */
      : (brw_inst_bits(src, 63, 61) << 15) | /*  3b */
        (brw_inst_bits(src, 46, 32));        /* 15b */

   for (int i = 0; i < 32; i++) {
      if (datatype_table[i] == uncompacted) {
         brw_compact_inst_set_datatype_index(devinfo, dst, i);
	 return true;
      }
   }

   return false;
}

static bool
set_subreg_index(const struct gen_device_info *devinfo, brw_compact_inst *dst,
                 const brw_inst *src, bool is_immediate)
{
   uint16_t uncompacted =                 /* 15b */
      (brw_inst_bits(src, 52, 48) << 0) | /*  5b */
      (brw_inst_bits(src, 68, 64) << 5);  /*  5b */

   if (!is_immediate)
      uncompacted |= brw_inst_bits(src, 100, 96) << 10; /* 5b */

   for (int i = 0; i < 32; i++) {
      if (subreg_table[i] == uncompacted) {
         brw_compact_inst_set_subreg_index(devinfo, dst, i);
	 return true;
      }
   }

   return false;
}

static bool
get_src_index(uint16_t uncompacted,
              uint16_t *compacted)
{
   for (int i = 0; i < 32; i++) {
      if (src_index_table[i] == uncompacted) {
	 *compacted = i;
	 return true;
      }
   }

   return false;
}

static bool
set_src0_index(const struct gen_device_info *devinfo,
               brw_compact_inst *dst, const brw_inst *src)
{
   uint16_t compacted;
   uint16_t uncompacted = brw_inst_bits(src, 88, 77); /* 12b */

   if (!get_src_index(uncompacted, &compacted))
      return false;

   brw_compact_inst_set_src0_index(devinfo, dst, compacted);

   return true;
}

static bool
set_src1_index(const struct gen_device_info *devinfo, brw_compact_inst *dst,
               const brw_inst *src, bool is_immediate)
{
   uint16_t compacted;

   if (is_immediate) {
      compacted = (brw_inst_imm_ud(devinfo, src) >> 8) & 0x1f;
   } else {
      uint16_t uncompacted = brw_inst_bits(src, 120, 109); /* 12b */

      if (!get_src_index(uncompacted, &compacted))
         return false;
   }

   brw_compact_inst_set_src1_index(devinfo, dst, compacted);

   return true;
}

static bool
set_3src_control_index(const struct gen_device_info *devinfo,
                       brw_compact_inst *dst, const brw_inst *src)
{
   assert(devinfo->gen >= 8);

   uint32_t uncompacted =                  /* 24b/BDW; 26b/CHV */
      (brw_inst_bits(src, 34, 32) << 21) | /*  3b */
      (brw_inst_bits(src, 28,  8));        /* 21b */

   if (devinfo->gen >= 9 || devinfo->is_cherryview)
      uncompacted |= brw_inst_bits(src, 36, 35) << 24; /* 2b */

   for (unsigned i = 0; i < ARRAY_SIZE(gen8_3src_control_index_table); i++) {
      if (gen8_3src_control_index_table[i] == uncompacted) {
         brw_compact_inst_set_3src_control_index(devinfo, dst, i);
	 return true;
      }
   }

   return false;
}

static bool
set_3src_source_index(const struct gen_device_info *devinfo,
                      brw_compact_inst *dst, const brw_inst *src)
{
   assert(devinfo->gen >= 8);

   uint64_t uncompacted =                    /* 46b/BDW; 49b/CHV */
      (brw_inst_bits(src,  83,  83) << 43) | /*  1b */
      (brw_inst_bits(src, 114, 107) << 35) | /*  8b */
      (brw_inst_bits(src,  93,  86) << 27) | /*  8b */
      (brw_inst_bits(src,  72,  65) << 19) | /*  8b */
      (brw_inst_bits(src,  55,  37));        /* 19b */

   if (devinfo->gen >= 9 || devinfo->is_cherryview) {
      uncompacted |=
         (brw_inst_bits(src, 126, 125) << 47) | /* 2b */
         (brw_inst_bits(src, 105, 104) << 45) | /* 2b */
         (brw_inst_bits(src,  84,  84) << 44);  /* 1b */
   } else {
      uncompacted |=
         (brw_inst_bits(src, 125, 125) << 45) | /* 1b */
         (brw_inst_bits(src, 104, 104) << 44);  /* 1b */
   }

   for (unsigned i = 0; i < ARRAY_SIZE(gen8_3src_source_index_table); i++) {
      if (gen8_3src_source_index_table[i] == uncompacted) {
         brw_compact_inst_set_3src_source_index(devinfo, dst, i);
	 return true;
      }
   }

   return false;
}

static bool
has_unmapped_bits(const struct gen_device_info *devinfo, const brw_inst *src)
{
   /* EOT can only be mapped on a send if the src1 is an immediate */
   if ((brw_inst_opcode(devinfo, src) == BRW_OPCODE_SENDC ||
        brw_inst_opcode(devinfo, src) == BRW_OPCODE_SEND) &&
       brw_inst_eot(devinfo, src))
      return true;

   /* Check for instruction bits that don't map to any of the fields of the
    * compacted instruction.  The instruction cannot be compacted if any of
    * them are set.  They overlap with:
    *  - NibCtrl (bit 47 on Gen7, bit 11 on Gen8)
    *  - Dst.AddrImm[9] (bit 47 on Gen8)
    *  - Src0.AddrImm[9] (bit 95 on Gen8)
    *  - Imm64[27:31] (bits 91-95 on Gen7, bit 95 on Gen8)
    *  - UIP[31] (bit 95 on Gen8)
    */
   if (devinfo->gen >= 8) {
      assert(!brw_inst_bits(src, 7,  7));
      return brw_inst_bits(src, 95, 95) ||
             brw_inst_bits(src, 47, 47) ||
             brw_inst_bits(src, 11, 11);
   } else {
      assert(!brw_inst_bits(src, 7,  7) &&
             !(devinfo->gen < 7 && brw_inst_bits(src, 90, 90)));
      return brw_inst_bits(src, 95, 91) ||
             brw_inst_bits(src, 47, 47);
   }
}

static bool
has_3src_unmapped_bits(const struct gen_device_info *devinfo,
                       const brw_inst *src)
{
   /* Check for three-source instruction bits that don't map to any of the
    * fields of the compacted instruction.  All of them seem to be reserved
    * bits currently.
    */
   if (devinfo->gen >= 9 || devinfo->is_cherryview) {
      assert(!brw_inst_bits(src, 127, 127) &&
             !brw_inst_bits(src, 7,  7));
   } else {
      assert(devinfo->gen >= 8);
      assert(!brw_inst_bits(src, 127, 126) &&
             !brw_inst_bits(src, 105, 105) &&
             !brw_inst_bits(src, 84, 84) &&
             !brw_inst_bits(src, 36, 35) &&
             !brw_inst_bits(src, 7,  7));
   }

   return false;
}

static bool
brw_try_compact_3src_instruction(const struct gen_device_info *devinfo,
                                 brw_compact_inst *dst, const brw_inst *src)
{
   assert(devinfo->gen >= 8);

   if (has_3src_unmapped_bits(devinfo, src))
      return false;

#define compact(field) \
   brw_compact_inst_set_3src_##field(devinfo, dst, brw_inst_3src_##field(devinfo, src))
#define compact_a16(field) \
   brw_compact_inst_set_3src_##field(devinfo, dst, brw_inst_3src_a16_##field(devinfo, src))

   compact(opcode);

   if (!set_3src_control_index(devinfo, dst, src))
      return false;

   if (!set_3src_source_index(devinfo, dst, src))
      return false;

   compact(dst_reg_nr);
   compact_a16(src0_rep_ctrl);
   brw_compact_inst_set_3src_cmpt_control(devinfo, dst, true);
   compact(debug_control);
   compact(saturate);
   compact_a16(src1_rep_ctrl);
   compact_a16(src2_rep_ctrl);
   compact(src0_reg_nr);
   compact(src1_reg_nr);
   compact(src2_reg_nr);
   compact_a16(src0_subreg_nr);
   compact_a16(src1_subreg_nr);
   compact_a16(src2_subreg_nr);

#undef compact
#undef compact_a16

   return true;
}

/* Compacted instructions have 12-bits for immediate sources, and a 13th bit
 * that's replicated through the high 20 bits.
 *
 * Effectively this means we get 12-bit integers, 0.0f, and some limited uses
 * of packed vectors as compactable immediates.
 */
static bool
is_compactable_immediate(unsigned imm)
{
   /* We get the low 12 bits as-is. */
   imm &= ~0xfff;

   /* We get one bit replicated through the top 20 bits. */
   return imm == 0 || imm == 0xfffff000;
}

/**
 * Applies some small changes to instruction types to increase chances of
 * compaction.
 */
static brw_inst
precompact(const struct gen_device_info *devinfo, brw_inst inst)
{
   if (brw_inst_src0_reg_file(devinfo, &inst) != BRW_IMMEDIATE_VALUE)
      return inst;

   /* The Bspec's section titled "Non-present Operands" claims that if src0
    * is an immediate that src1's type must be the same as that of src0.
    *
    * The SNB+ DataTypeIndex instruction compaction tables contain mappings
    * that do not follow this rule. E.g., from the IVB/HSW table:
    *
    *  DataTypeIndex   18-Bit Mapping       Mapped Meaning
    *        3         001000001011111101   r:f | i:vf | a:ud | <1> | dir |
    *
    * And from the SNB table:
    *
    *  DataTypeIndex   18-Bit Mapping       Mapped Meaning
    *        8         001000000111101100   a:w | i:w | a:ud | <1> | dir |
    *
    * Neither of these cause warnings from the simulator when used,
    * compacted or otherwise. In fact, all compaction mappings that have an
    * immediate in src0 use a:ud for src1.
    *
    * The GM45 instruction compaction tables do not contain mapped meanings
    * so it's not clear whether it has the restriction. We'll assume it was
    * lifted on SNB. (FINISHME: decode the GM45 tables and check.)
    *
    * Don't do any of this for 64-bit immediates, since the src1 fields
    * overlap with the immediate and setting them would overwrite the
    * immediate we set.
    */
   if (devinfo->gen >= 6 &&
       !(devinfo->is_haswell &&
         brw_inst_opcode(devinfo, &inst) == BRW_OPCODE_DIM) &&
       !(devinfo->gen >= 8 &&
         (brw_inst_src0_type(devinfo, &inst) == BRW_REGISTER_TYPE_DF ||
          brw_inst_src0_type(devinfo, &inst) == BRW_REGISTER_TYPE_UQ ||
          brw_inst_src0_type(devinfo, &inst) == BRW_REGISTER_TYPE_Q))) {
      enum brw_reg_file file = brw_inst_src1_reg_file(devinfo, &inst);
      brw_inst_set_src1_file_type(devinfo, &inst, file, BRW_REGISTER_TYPE_UD);
   }

   /* Compacted instructions only have 12-bits (plus 1 for the other 20)
    * for immediate values. Presumably the hardware engineers realized
    * that the only useful floating-point value that could be represented
    * in this format is 0.0, which can also be represented as a VF-typed
    * immediate, so they gave us the previously mentioned mapping on IVB+.
    *
    * Strangely, we do have a mapping for imm:f in src1, so we don't need
    * to do this there.
    *
    * If we see a 0.0:F, change the type to VF so that it can be compacted.
    */
   if (brw_inst_imm_ud(devinfo, &inst) == 0x0 &&
       brw_inst_src0_type(devinfo, &inst) == BRW_REGISTER_TYPE_F &&
       brw_inst_dst_type(devinfo, &inst) == BRW_REGISTER_TYPE_F &&
       brw_inst_dst_hstride(devinfo, &inst) == BRW_HORIZONTAL_STRIDE_1) {
      enum brw_reg_file file = brw_inst_src0_reg_file(devinfo, &inst);
      brw_inst_set_src0_file_type(devinfo, &inst, file, BRW_REGISTER_TYPE_VF);
   }

   /* There are no mappings for dst:d | i:d, so if the immediate is suitable
    * set the types to :UD so the instruction can be compacted.
    */
   if (is_compactable_immediate(brw_inst_imm_ud(devinfo, &inst)) &&
       brw_inst_cond_modifier(devinfo, &inst) == BRW_CONDITIONAL_NONE &&
       brw_inst_src0_type(devinfo, &inst) == BRW_REGISTER_TYPE_D &&
       brw_inst_dst_type(devinfo, &inst) == BRW_REGISTER_TYPE_D) {
      enum brw_reg_file src_file = brw_inst_src0_reg_file(devinfo, &inst);
      enum brw_reg_file dst_file = brw_inst_dst_reg_file(devinfo, &inst);

      brw_inst_set_src0_file_type(devinfo, &inst, src_file, BRW_REGISTER_TYPE_UD);
      brw_inst_set_dst_file_type(devinfo, &inst, dst_file, BRW_REGISTER_TYPE_UD);
   }

   return inst;
}

/**
 * Tries to compact instruction src into dst.
 *
 * It doesn't modify dst unless src is compactable, which is relied on by
 * brw_compact_instructions().
 */
bool
brw_try_compact_instruction(const struct gen_device_info *devinfo,
                            brw_compact_inst *dst, const brw_inst *src)
{
   brw_compact_inst temp;

   assert(brw_inst_cmpt_control(devinfo, src) == 0);

   if (is_3src(devinfo, brw_inst_opcode(devinfo, src))) {
      if (devinfo->gen >= 8) {
         memset(&temp, 0, sizeof(temp));
         if (brw_try_compact_3src_instruction(devinfo, &temp, src)) {
            *dst = temp;
            return true;
         } else {
            return false;
         }
      } else {
         return false;
      }
   }

   bool is_immediate =
      brw_inst_src0_reg_file(devinfo, src) == BRW_IMMEDIATE_VALUE ||
      brw_inst_src1_reg_file(devinfo, src) == BRW_IMMEDIATE_VALUE;
   if (is_immediate &&
       (devinfo->gen < 6 ||
        !is_compactable_immediate(brw_inst_imm_ud(devinfo, src)))) {
      return false;
   }

   if (has_unmapped_bits(devinfo, src))
      return false;

   memset(&temp, 0, sizeof(temp));

#define compact(field) \
   brw_compact_inst_set_##field(devinfo, &temp, brw_inst_##field(devinfo, src))

   compact(opcode);
   compact(debug_control);

   if (!set_control_index(devinfo, &temp, src))
      return false;
   if (!set_datatype_index(devinfo, &temp, src))
      return false;
   if (!set_subreg_index(devinfo, &temp, src, is_immediate))
      return false;

   if (devinfo->gen >= 6) {
      compact(acc_wr_control);
   } else {
      compact(mask_control_ex);
   }

   compact(cond_modifier);

   if (devinfo->gen <= 6)
      compact(flag_subreg_nr);

   brw_compact_inst_set_cmpt_control(devinfo, &temp, true);

   if (!set_src0_index(devinfo, &temp, src))
      return false;
   if (!set_src1_index(devinfo, &temp, src, is_immediate))
      return false;

   brw_compact_inst_set_dst_reg_nr(devinfo, &temp,
                                   brw_inst_dst_da_reg_nr(devinfo, src));
   brw_compact_inst_set_src0_reg_nr(devinfo, &temp,
                                    brw_inst_src0_da_reg_nr(devinfo, src));

   if (is_immediate) {
      brw_compact_inst_set_src1_reg_nr(devinfo, &temp,
                                       brw_inst_imm_ud(devinfo, src) & 0xff);
   } else {
      brw_compact_inst_set_src1_reg_nr(devinfo, &temp,
                                       brw_inst_src1_da_reg_nr(devinfo, src));
   }

#undef compact

   *dst = temp;

   return true;
}

static void
set_uncompacted_control(const struct gen_device_info *devinfo, brw_inst *dst,
                        brw_compact_inst *src)
{
   uint32_t uncompacted =
      control_index_table[brw_compact_inst_control_index(devinfo, src)];

   if (devinfo->gen >= 8) {
      brw_inst_set_bits(dst, 33, 31, (uncompacted >> 16));
      brw_inst_set_bits(dst, 23, 12, (uncompacted >>  4) & 0xfff);
      brw_inst_set_bits(dst, 10,  9, (uncompacted >>  2) & 0x3);
      brw_inst_set_bits(dst, 34, 34, (uncompacted >>  1) & 0x1);
      brw_inst_set_bits(dst,  8,  8, (uncompacted >>  0) & 0x1);
   } else {
      brw_inst_set_bits(dst, 31, 31, (uncompacted >> 16) & 0x1);
      brw_inst_set_bits(dst, 23,  8, (uncompacted & 0xffff));

      if (devinfo->gen == 7)
         brw_inst_set_bits(dst, 90, 89, uncompacted >> 17);
   }
}

static void
set_uncompacted_datatype(const struct gen_device_info *devinfo, brw_inst *dst,
                         brw_compact_inst *src)
{
   uint32_t uncompacted =
      datatype_table[brw_compact_inst_datatype_index(devinfo, src)];

   if (devinfo->gen >= 8) {
      brw_inst_set_bits(dst, 63, 61, (uncompacted >> 18));
      brw_inst_set_bits(dst, 94, 89, (uncompacted >> 12) & 0x3f);
      brw_inst_set_bits(dst, 46, 35, (uncompacted >>  0) & 0xfff);
   } else {
      brw_inst_set_bits(dst, 63, 61, (uncompacted >> 15));
      brw_inst_set_bits(dst, 46, 32, (uncompacted & 0x7fff));
   }
}

static void
set_uncompacted_subreg(const struct gen_device_info *devinfo, brw_inst *dst,
                       brw_compact_inst *src)
{
   uint16_t uncompacted =
      subreg_table[brw_compact_inst_subreg_index(devinfo, src)];

   brw_inst_set_bits(dst, 100, 96, (uncompacted >> 10));
   brw_inst_set_bits(dst,  68, 64, (uncompacted >>  5) & 0x1f);
   brw_inst_set_bits(dst,  52, 48, (uncompacted >>  0) & 0x1f);
}

static void
set_uncompacted_src0(const struct gen_device_info *devinfo, brw_inst *dst,
                     brw_compact_inst *src)
{
   uint32_t compacted = brw_compact_inst_src0_index(devinfo, src);
   uint16_t uncompacted = src_index_table[compacted];

   brw_inst_set_bits(dst, 88, 77, uncompacted);
}

static void
set_uncompacted_src1(const struct gen_device_info *devinfo, brw_inst *dst,
                     brw_compact_inst *src, bool is_immediate)
{
   if (is_immediate) {
      signed high5 = brw_compact_inst_src1_index(devinfo, src);
      /* Replicate top bit of src1_index into high 20 bits of the immediate. */
      brw_inst_set_imm_ud(devinfo, dst, (high5 << 27) >> 19);
   } else {
      uint16_t uncompacted =
         src_index_table[brw_compact_inst_src1_index(devinfo, src)];

      brw_inst_set_bits(dst, 120, 109, uncompacted);
   }
}

static void
set_uncompacted_3src_control_index(const struct gen_device_info *devinfo,
                                   brw_inst *dst, brw_compact_inst *src)
{
   assert(devinfo->gen >= 8);

   uint32_t compacted = brw_compact_inst_3src_control_index(devinfo, src);
   uint32_t uncompacted = gen8_3src_control_index_table[compacted];

   brw_inst_set_bits(dst, 34, 32, (uncompacted >> 21) & 0x7);
   brw_inst_set_bits(dst, 28,  8, (uncompacted >>  0) & 0x1fffff);

   if (devinfo->gen >= 9 || devinfo->is_cherryview)
      brw_inst_set_bits(dst, 36, 35, (uncompacted >> 24) & 0x3);
}

static void
set_uncompacted_3src_source_index(const struct gen_device_info *devinfo,
                                  brw_inst *dst, brw_compact_inst *src)
{
   assert(devinfo->gen >= 8);

   uint32_t compacted = brw_compact_inst_3src_source_index(devinfo, src);
   uint64_t uncompacted = gen8_3src_source_index_table[compacted];

   brw_inst_set_bits(dst,  83,  83, (uncompacted >> 43) & 0x1);
   brw_inst_set_bits(dst, 114, 107, (uncompacted >> 35) & 0xff);
   brw_inst_set_bits(dst,  93,  86, (uncompacted >> 27) & 0xff);
   brw_inst_set_bits(dst,  72,  65, (uncompacted >> 19) & 0xff);
   brw_inst_set_bits(dst,  55,  37, (uncompacted >>  0) & 0x7ffff);

   if (devinfo->gen >= 9 || devinfo->is_cherryview) {
      brw_inst_set_bits(dst, 126, 125, (uncompacted >> 47) & 0x3);
      brw_inst_set_bits(dst, 105, 104, (uncompacted >> 45) & 0x3);
      brw_inst_set_bits(dst,  84,  84, (uncompacted >> 44) & 0x1);
   } else {
      brw_inst_set_bits(dst, 125, 125, (uncompacted >> 45) & 0x1);
      brw_inst_set_bits(dst, 104, 104, (uncompacted >> 44) & 0x1);
   }
}

static void
brw_uncompact_3src_instruction(const struct gen_device_info *devinfo,
                               brw_inst *dst, brw_compact_inst *src)
{
   assert(devinfo->gen >= 8);

#define uncompact(field) \
   brw_inst_set_3src_##field(devinfo, dst, brw_compact_inst_3src_##field(devinfo, src))
#define uncompact_a16(field) \
   brw_inst_set_3src_a16_##field(devinfo, dst, brw_compact_inst_3src_##field(devinfo, src))

   uncompact(opcode);

   set_uncompacted_3src_control_index(devinfo, dst, src);
   set_uncompacted_3src_source_index(devinfo, dst, src);

   uncompact(dst_reg_nr);
   uncompact_a16(src0_rep_ctrl);
   brw_inst_set_3src_cmpt_control(devinfo, dst, false);
   uncompact(debug_control);
   uncompact(saturate);
   uncompact_a16(src1_rep_ctrl);
   uncompact_a16(src2_rep_ctrl);
   uncompact(src0_reg_nr);
   uncompact(src1_reg_nr);
   uncompact(src2_reg_nr);
   uncompact_a16(src0_subreg_nr);
   uncompact_a16(src1_subreg_nr);
   uncompact_a16(src2_subreg_nr);

#undef uncompact
#undef uncompact_a16
}

void
brw_uncompact_instruction(const struct gen_device_info *devinfo, brw_inst *dst,
                          brw_compact_inst *src)
{
   memset(dst, 0, sizeof(*dst));

   if (devinfo->gen >= 8 &&
       is_3src(devinfo, brw_compact_inst_3src_opcode(devinfo, src))) {
      brw_uncompact_3src_instruction(devinfo, dst, src);
      return;
   }

#define uncompact(field) \
   brw_inst_set_##field(devinfo, dst, brw_compact_inst_##field(devinfo, src))

   uncompact(opcode);
   uncompact(debug_control);

   set_uncompacted_control(devinfo, dst, src);
   set_uncompacted_datatype(devinfo, dst, src);

   /* src0/1 register file fields are in the datatype table. */
   bool is_immediate = brw_inst_src0_reg_file(devinfo, dst) == BRW_IMMEDIATE_VALUE ||
                       brw_inst_src1_reg_file(devinfo, dst) == BRW_IMMEDIATE_VALUE;

   set_uncompacted_subreg(devinfo, dst, src);

   if (devinfo->gen >= 6) {
      uncompact(acc_wr_control);
   } else {
      uncompact(mask_control_ex);
   }

   uncompact(cond_modifier);

   if (devinfo->gen <= 6)
      uncompact(flag_subreg_nr);

   set_uncompacted_src0(devinfo, dst, src);
   set_uncompacted_src1(devinfo, dst, src, is_immediate);

   brw_inst_set_dst_da_reg_nr(devinfo, dst,
                              brw_compact_inst_dst_reg_nr(devinfo, src));
   brw_inst_set_src0_da_reg_nr(devinfo, dst,
                               brw_compact_inst_src0_reg_nr(devinfo, src));

   if (is_immediate) {
      brw_inst_set_imm_ud(devinfo, dst,
                          brw_inst_imm_ud(devinfo, dst) |
                          brw_compact_inst_src1_reg_nr(devinfo, src));
   } else {
      brw_inst_set_src1_da_reg_nr(devinfo, dst,
                                  brw_compact_inst_src1_reg_nr(devinfo, src));
   }

#undef uncompact
}

void brw_debug_compact_uncompact(const struct gen_device_info *devinfo,
                                 brw_inst *orig,
                                 brw_inst *uncompacted)
{
   fprintf(stderr, "Instruction compact/uncompact changed (gen%d):\n",
           devinfo->gen);

   fprintf(stderr, "  before: ");
   brw_disassemble_inst(stderr, devinfo, orig, true);

   fprintf(stderr, "  after:  ");
   brw_disassemble_inst(stderr, devinfo, uncompacted, false);

   uint32_t *before_bits = (uint32_t *)orig;
   uint32_t *after_bits = (uint32_t *)uncompacted;
   fprintf(stderr, "  changed bits:\n");
   for (int i = 0; i < 128; i++) {
      uint32_t before = before_bits[i / 32] & (1 << (i & 31));
      uint32_t after = after_bits[i / 32] & (1 << (i & 31));

      if (before != after) {
         fprintf(stderr, "  bit %d, %s to %s\n", i,
                 before ? "set" : "unset",
                 after ? "set" : "unset");
      }
   }
}

static int
compacted_between(int old_ip, int old_target_ip, int *compacted_counts)
{
   int this_compacted_count = compacted_counts[old_ip];
   int target_compacted_count = compacted_counts[old_target_ip];
   return target_compacted_count - this_compacted_count;
}

static void
update_uip_jip(const struct gen_device_info *devinfo, brw_inst *insn,
               int this_old_ip, int *compacted_counts)
{
   /* JIP and UIP are in units of:
    *    - bytes on Gen8+; and
    *    - compacted instructions on Gen6+.
    */
   int shift = devinfo->gen >= 8 ? 3 : 0;

   int32_t jip_compacted = brw_inst_jip(devinfo, insn) >> shift;
   jip_compacted -= compacted_between(this_old_ip,
                                      this_old_ip + (jip_compacted / 2),
                                      compacted_counts);
   brw_inst_set_jip(devinfo, insn, jip_compacted << shift);

   if (brw_inst_opcode(devinfo, insn) == BRW_OPCODE_ENDIF ||
       brw_inst_opcode(devinfo, insn) == BRW_OPCODE_WHILE ||
       (brw_inst_opcode(devinfo, insn) == BRW_OPCODE_ELSE && devinfo->gen <= 7))
      return;

   int32_t uip_compacted = brw_inst_uip(devinfo, insn) >> shift;
   uip_compacted -= compacted_between(this_old_ip,
                                      this_old_ip + (uip_compacted / 2),
                                      compacted_counts);
   brw_inst_set_uip(devinfo, insn, uip_compacted << shift);
}

static void
update_gen4_jump_count(const struct gen_device_info *devinfo, brw_inst *insn,
                       int this_old_ip, int *compacted_counts)
{
   assert(devinfo->gen == 5 || devinfo->is_g4x);

   /* Jump Count is in units of:
    *    - uncompacted instructions on G45; and
    *    - compacted instructions on Gen5.
    */
   int shift = devinfo->is_g4x ? 1 : 0;

   int jump_count_compacted = brw_inst_gen4_jump_count(devinfo, insn) << shift;

   int target_old_ip = this_old_ip + (jump_count_compacted / 2);

   int this_compacted_count = compacted_counts[this_old_ip];
   int target_compacted_count = compacted_counts[target_old_ip];

   jump_count_compacted -= (target_compacted_count - this_compacted_count);
   brw_inst_set_gen4_jump_count(devinfo, insn, jump_count_compacted >> shift);
}

void
brw_init_compaction_tables(const struct gen_device_info *devinfo)
{
   assert(g45_control_index_table[ARRAY_SIZE(g45_control_index_table) - 1] != 0);
   assert(g45_datatype_table[ARRAY_SIZE(g45_datatype_table) - 1] != 0);
   assert(g45_subreg_table[ARRAY_SIZE(g45_subreg_table) - 1] != 0);
   assert(g45_src_index_table[ARRAY_SIZE(g45_src_index_table) - 1] != 0);
   assert(gen6_control_index_table[ARRAY_SIZE(gen6_control_index_table) - 1] != 0);
   assert(gen6_datatype_table[ARRAY_SIZE(gen6_datatype_table) - 1] != 0);
   assert(gen6_subreg_table[ARRAY_SIZE(gen6_subreg_table) - 1] != 0);
   assert(gen6_src_index_table[ARRAY_SIZE(gen6_src_index_table) - 1] != 0);
   assert(gen7_control_index_table[ARRAY_SIZE(gen7_control_index_table) - 1] != 0);
   assert(gen7_datatype_table[ARRAY_SIZE(gen7_datatype_table) - 1] != 0);
   assert(gen7_subreg_table[ARRAY_SIZE(gen7_subreg_table) - 1] != 0);
   assert(gen7_src_index_table[ARRAY_SIZE(gen7_src_index_table) - 1] != 0);
   assert(gen8_control_index_table[ARRAY_SIZE(gen8_control_index_table) - 1] != 0);
   assert(gen8_datatype_table[ARRAY_SIZE(gen8_datatype_table) - 1] != 0);
   assert(gen8_subreg_table[ARRAY_SIZE(gen8_subreg_table) - 1] != 0);
   assert(gen8_src_index_table[ARRAY_SIZE(gen8_src_index_table) - 1] != 0);
   assert(gen11_datatype_table[ARRAY_SIZE(gen11_datatype_table) - 1] != 0);

   switch (devinfo->gen) {
   case 11:
      control_index_table = gen8_control_index_table;
      datatype_table = gen11_datatype_table;
      subreg_table = gen8_subreg_table;
      src_index_table = gen8_src_index_table;
      break;
   case 10:
   case 9:
   case 8:
      control_index_table = gen8_control_index_table;
      datatype_table = gen8_datatype_table;
      subreg_table = gen8_subreg_table;
      src_index_table = gen8_src_index_table;
      break;
   case 7:
      control_index_table = gen7_control_index_table;
      datatype_table = gen7_datatype_table;
      subreg_table = gen7_subreg_table;
      src_index_table = gen7_src_index_table;
      break;
   case 6:
      control_index_table = gen6_control_index_table;
      datatype_table = gen6_datatype_table;
      subreg_table = gen6_subreg_table;
      src_index_table = gen6_src_index_table;
      break;
   case 5:
   case 4:
      control_index_table = g45_control_index_table;
      datatype_table = g45_datatype_table;
      subreg_table = g45_subreg_table;
      src_index_table = g45_src_index_table;
      break;
   default:
      unreachable("unknown generation");
   }
}

void
brw_compact_instructions(struct brw_codegen *p, int start_offset,
                         struct disasm_info *disasm)
{
   if (unlikely(INTEL_DEBUG & DEBUG_NO_COMPACTION))
      return;

   const struct gen_device_info *devinfo = p->devinfo;
   void *store = p->store + start_offset / 16;
   /* For an instruction at byte offset 16*i before compaction, this is the
    * number of compacted instructions minus the number of padding NOP/NENOPs
    * that preceded it.
    */
   int compacted_counts[(p->next_insn_offset - start_offset) / sizeof(brw_inst)];
   /* For an instruction at byte offset 8*i after compaction, this was its IP
    * (in 16-byte units) before compaction.
    */
   int old_ip[(p->next_insn_offset - start_offset) / sizeof(brw_compact_inst) + 1];

   if (devinfo->gen == 4 && !devinfo->is_g4x)
      return;

   int offset = 0;
   int compacted_count = 0;
   for (int src_offset = 0; src_offset < p->next_insn_offset - start_offset;
        src_offset += sizeof(brw_inst)) {
      brw_inst *src = store + src_offset;
      void *dst = store + offset;

      old_ip[offset / sizeof(brw_compact_inst)] = src_offset / sizeof(brw_inst);
      compacted_counts[src_offset / sizeof(brw_inst)] = compacted_count;

      brw_inst inst = precompact(devinfo, *src);
      brw_inst saved = inst;

      if (brw_try_compact_instruction(devinfo, dst, &inst)) {
         compacted_count++;

         if (INTEL_DEBUG) {
            brw_inst uncompacted;
            brw_uncompact_instruction(devinfo, &uncompacted, dst);
            if (memcmp(&saved, &uncompacted, sizeof(uncompacted))) {
               brw_debug_compact_uncompact(devinfo, &saved, &uncompacted);
            }
         }

         offset += sizeof(brw_compact_inst);
      } else {
         /* All uncompacted instructions need to be aligned on G45. */
         if ((offset & sizeof(brw_compact_inst)) != 0 && devinfo->is_g4x){
            brw_compact_inst *align = store + offset;
            memset(align, 0, sizeof(*align));
            brw_compact_inst_set_opcode(devinfo, align, BRW_OPCODE_NENOP);
            brw_compact_inst_set_cmpt_control(devinfo, align, true);
            offset += sizeof(brw_compact_inst);
            compacted_count--;
            compacted_counts[src_offset / sizeof(brw_inst)] = compacted_count;
            old_ip[offset / sizeof(brw_compact_inst)] = src_offset / sizeof(brw_inst);

            dst = store + offset;
         }

         /* If we didn't compact this intruction, we need to move it down into
          * place.
          */
         if (offset != src_offset) {
            memmove(dst, src, sizeof(brw_inst));
         }
         offset += sizeof(brw_inst);
      }
   }

   /* Add an entry for the ending offset of the program. This greatly
    * simplifies the linked list walk at the end of the function.
    */
   old_ip[offset / sizeof(brw_compact_inst)] =
      (p->next_insn_offset - start_offset) / sizeof(brw_inst);

   /* Fix up control flow offsets. */
   p->next_insn_offset = start_offset + offset;
   for (offset = 0; offset < p->next_insn_offset - start_offset;
        offset = next_offset(devinfo, store, offset)) {
      brw_inst *insn = store + offset;
      int this_old_ip = old_ip[offset / sizeof(brw_compact_inst)];
      int this_compacted_count = compacted_counts[this_old_ip];

      switch (brw_inst_opcode(devinfo, insn)) {
      case BRW_OPCODE_BREAK:
      case BRW_OPCODE_CONTINUE:
      case BRW_OPCODE_HALT:
         if (devinfo->gen >= 6) {
            update_uip_jip(devinfo, insn, this_old_ip, compacted_counts);
         } else {
            update_gen4_jump_count(devinfo, insn, this_old_ip,
                                   compacted_counts);
         }
         break;

      case BRW_OPCODE_IF:
      case BRW_OPCODE_IFF:
      case BRW_OPCODE_ELSE:
      case BRW_OPCODE_ENDIF:
      case BRW_OPCODE_WHILE:
         if (devinfo->gen >= 7) {
            if (brw_inst_cmpt_control(devinfo, insn)) {
               brw_inst uncompacted;
               brw_uncompact_instruction(devinfo, &uncompacted,
                                         (brw_compact_inst *)insn);

               update_uip_jip(devinfo, &uncompacted, this_old_ip,
                              compacted_counts);

               bool ret = brw_try_compact_instruction(devinfo,
                                                      (brw_compact_inst *)insn,
                                                      &uncompacted);
               assert(ret); (void)ret;
            } else {
               update_uip_jip(devinfo, insn, this_old_ip, compacted_counts);
            }
         } else if (devinfo->gen == 6) {
            assert(!brw_inst_cmpt_control(devinfo, insn));

            /* Jump Count is in units of compacted instructions on Gen6. */
            int jump_count_compacted = brw_inst_gen6_jump_count(devinfo, insn);

            int target_old_ip = this_old_ip + (jump_count_compacted / 2);
            int target_compacted_count = compacted_counts[target_old_ip];
            jump_count_compacted -= (target_compacted_count - this_compacted_count);
            brw_inst_set_gen6_jump_count(devinfo, insn, jump_count_compacted);
         } else {
            update_gen4_jump_count(devinfo, insn, this_old_ip,
                                   compacted_counts);
         }
         break;

      case BRW_OPCODE_ADD:
         /* Add instructions modifying the IP register use an immediate src1,
          * and Gens that use this cannot compact instructions with immediate
          * operands.
          */
         if (brw_inst_cmpt_control(devinfo, insn))
            break;

         if (brw_inst_dst_reg_file(devinfo, insn) == BRW_ARCHITECTURE_REGISTER_FILE &&
             brw_inst_dst_da_reg_nr(devinfo, insn) == BRW_ARF_IP) {
            assert(brw_inst_src1_reg_file(devinfo, insn) == BRW_IMMEDIATE_VALUE);

            int shift = 3;
            int jump_compacted = brw_inst_imm_d(devinfo, insn) >> shift;

            int target_old_ip = this_old_ip + (jump_compacted / 2);
            int target_compacted_count = compacted_counts[target_old_ip];
            jump_compacted -= (target_compacted_count - this_compacted_count);
            brw_inst_set_imm_ud(devinfo, insn, jump_compacted << shift);
         }
         break;
      }
   }

   /* p->nr_insn is counting the number of uncompacted instructions still, so
    * divide.  We do want to be sure there's a valid instruction in any
    * alignment padding, so that the next compression pass (for the FS 8/16
    * compile passes) parses correctly.
    */
   if (p->next_insn_offset & sizeof(brw_compact_inst)) {
      brw_compact_inst *align = store + offset;
      memset(align, 0, sizeof(*align));
      brw_compact_inst_set_opcode(devinfo, align, BRW_OPCODE_NOP);
      brw_compact_inst_set_cmpt_control(devinfo, align, true);
      p->next_insn_offset += sizeof(brw_compact_inst);
   }
   p->nr_insn = p->next_insn_offset / sizeof(brw_inst);

   /* Update the instruction offsets for each group. */
   if (disasm) {
      int offset = 0;

      foreach_list_typed(struct inst_group, group, link, &disasm->group_list) {
         while (start_offset + old_ip[offset / sizeof(brw_compact_inst)] *
                sizeof(brw_inst) != group->offset) {
            assert(start_offset + old_ip[offset / sizeof(brw_compact_inst)] *
                   sizeof(brw_inst) < group->offset);
            offset = next_offset(devinfo, store, offset);
         }

         group->offset = start_offset + offset;

         offset = next_offset(devinfo, store, offset);
      }
   }
}