/
asm5.go
2856 lines (2460 loc) · 68.9 KB
/
asm5.go
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
// Inferno utils/5l/span.c
// http://code.google.com/p/inferno-os/source/browse/utils/5l/span.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// 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 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.
package arm
import (
"cmd/internal/obj"
"fmt"
"log"
"math"
"sort"
)
type Optab struct {
as uint16
a1 uint8
a2 int8
a3 uint8
type_ uint8
size int8
param int16
flag int8
pcrelsiz uint8
}
type Oprang struct {
start []Optab
stop []Optab
}
type Opcross [32][2][32]uint8
const (
LFROM = 1 << 0
LTO = 1 << 1
LPOOL = 1 << 2
LPCREL = 1 << 3
)
var optab = []Optab{
/* struct Optab:
OPCODE, from, prog->reg, to, type,size,param,flag */
Optab{obj.ATEXT, C_ADDR, C_NONE, C_TEXTSIZE, 0, 0, 0, 0, 0},
Optab{AADD, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
Optab{AADD, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
Optab{AMVN, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
Optab{ACMP, C_REG, C_REG, C_NONE, 1, 4, 0, 0, 0},
Optab{AADD, C_RCON, C_REG, C_REG, 2, 4, 0, 0, 0},
Optab{AADD, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0},
Optab{AMOVW, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0},
Optab{AMVN, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0},
Optab{ACMP, C_RCON, C_REG, C_NONE, 2, 4, 0, 0, 0},
Optab{AADD, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0},
Optab{AADD, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
Optab{AMVN, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
Optab{ACMP, C_SHIFT, C_REG, C_NONE, 3, 4, 0, 0, 0},
Optab{AMOVW, C_RACON, C_NONE, C_REG, 4, 4, REGSP, 0, 0},
Optab{AB, C_NONE, C_NONE, C_SBRA, 5, 4, 0, LPOOL, 0},
Optab{ABL, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0},
Optab{ABX, C_NONE, C_NONE, C_SBRA, 74, 20, 0, 0, 0},
Optab{ABEQ, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0},
Optab{ABEQ, C_RCON, C_NONE, C_SBRA, 5, 4, 0, 0, 0}, // prediction hinted form, hint ignored
Optab{AB, C_NONE, C_NONE, C_ROREG, 6, 4, 0, LPOOL, 0},
Optab{ABL, C_NONE, C_NONE, C_ROREG, 7, 4, 0, 0, 0},
Optab{ABL, C_REG, C_NONE, C_ROREG, 7, 4, 0, 0, 0},
Optab{ABX, C_NONE, C_NONE, C_ROREG, 75, 12, 0, 0, 0},
Optab{ABXRET, C_NONE, C_NONE, C_ROREG, 76, 4, 0, 0, 0},
Optab{ASLL, C_RCON, C_REG, C_REG, 8, 4, 0, 0, 0},
Optab{ASLL, C_RCON, C_NONE, C_REG, 8, 4, 0, 0, 0},
Optab{ASLL, C_REG, C_NONE, C_REG, 9, 4, 0, 0, 0},
Optab{ASLL, C_REG, C_REG, C_REG, 9, 4, 0, 0, 0},
Optab{ASWI, C_NONE, C_NONE, C_NONE, 10, 4, 0, 0, 0},
Optab{ASWI, C_NONE, C_NONE, C_LOREG, 10, 4, 0, 0, 0},
Optab{ASWI, C_NONE, C_NONE, C_LCON, 10, 4, 0, 0, 0},
Optab{AWORD, C_NONE, C_NONE, C_LCON, 11, 4, 0, 0, 0},
Optab{AWORD, C_NONE, C_NONE, C_LCONADDR, 11, 4, 0, 0, 0},
Optab{AWORD, C_NONE, C_NONE, C_ADDR, 11, 4, 0, 0, 0},
Optab{AMOVW, C_NCON, C_NONE, C_REG, 12, 4, 0, 0, 0},
Optab{AMOVW, C_LCON, C_NONE, C_REG, 12, 4, 0, LFROM, 0},
Optab{AMOVW, C_LCONADDR, C_NONE, C_REG, 12, 4, 0, LFROM | LPCREL, 4},
Optab{AADD, C_NCON, C_REG, C_REG, 13, 8, 0, 0, 0},
Optab{AADD, C_NCON, C_NONE, C_REG, 13, 8, 0, 0, 0},
Optab{AMVN, C_NCON, C_NONE, C_REG, 13, 8, 0, 0, 0},
Optab{ACMP, C_NCON, C_REG, C_NONE, 13, 8, 0, 0, 0},
Optab{AADD, C_LCON, C_REG, C_REG, 13, 8, 0, LFROM, 0},
Optab{AADD, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0},
Optab{AMVN, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0},
Optab{ACMP, C_LCON, C_REG, C_NONE, 13, 8, 0, LFROM, 0},
Optab{AMOVB, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
Optab{AMOVBS, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0},
Optab{AMOVBU, C_REG, C_NONE, C_REG, 58, 4, 0, 0, 0},
Optab{AMOVH, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
Optab{AMOVHS, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0},
Optab{AMOVHU, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0},
Optab{AMUL, C_REG, C_REG, C_REG, 15, 4, 0, 0, 0},
Optab{AMUL, C_REG, C_NONE, C_REG, 15, 4, 0, 0, 0},
Optab{ADIV, C_REG, C_REG, C_REG, 16, 4, 0, 0, 0},
Optab{ADIV, C_REG, C_NONE, C_REG, 16, 4, 0, 0, 0},
Optab{AMULL, C_REG, C_REG, C_REGREG, 17, 4, 0, 0, 0},
Optab{AMULA, C_REG, C_REG, C_REGREG2, 17, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0},
Optab{AMOVB, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0},
Optab{AMOVB, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0},
Optab{AMOVBS, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0},
Optab{AMOVBS, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0},
Optab{AMOVBU, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0},
Optab{AMOVBU, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0},
Optab{AMOVW, C_SAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
Optab{AMOVW, C_SOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
Optab{AMOVBU, C_SAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
Optab{AMOVBU, C_SOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
Optab{AMOVW, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
Optab{AMOVW, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4},
Optab{AMOVB, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
Optab{AMOVB, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
Optab{AMOVB, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4},
Optab{AMOVBS, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
Optab{AMOVBS, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
Optab{AMOVBS, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4},
Optab{AMOVBU, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
Optab{AMOVBU, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
Optab{AMOVBU, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4},
Optab{AMOVW, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
Optab{AMOVW, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
Optab{AMOVW, C_ADDR, C_NONE, C_REG, 65, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVBU, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
Optab{AMOVBU, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
Optab{AMOVBU, C_ADDR, C_NONE, C_REG, 65, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVW, C_LACON, C_NONE, C_REG, 34, 8, REGSP, LFROM, 0},
Optab{AMOVW, C_PSR, C_NONE, C_REG, 35, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_PSR, 36, 4, 0, 0, 0},
Optab{AMOVW, C_RCON, C_NONE, C_PSR, 37, 4, 0, 0, 0},
Optab{AMOVM, C_REGLIST, C_NONE, C_SOREG, 38, 4, 0, 0, 0},
Optab{AMOVM, C_SOREG, C_NONE, C_REGLIST, 39, 4, 0, 0, 0},
Optab{ASWPW, C_SOREG, C_REG, C_REG, 40, 4, 0, 0, 0},
Optab{ARFE, C_NONE, C_NONE, C_NONE, 41, 4, 0, 0, 0},
Optab{AMOVF, C_FREG, C_NONE, C_FAUTO, 50, 4, REGSP, 0, 0},
Optab{AMOVF, C_FREG, C_NONE, C_FOREG, 50, 4, 0, 0, 0},
Optab{AMOVF, C_FAUTO, C_NONE, C_FREG, 51, 4, REGSP, 0, 0},
Optab{AMOVF, C_FOREG, C_NONE, C_FREG, 51, 4, 0, 0, 0},
Optab{AMOVF, C_FREG, C_NONE, C_LAUTO, 52, 12, REGSP, LTO, 0},
Optab{AMOVF, C_FREG, C_NONE, C_LOREG, 52, 12, 0, LTO, 0},
Optab{AMOVF, C_LAUTO, C_NONE, C_FREG, 53, 12, REGSP, LFROM, 0},
Optab{AMOVF, C_LOREG, C_NONE, C_FREG, 53, 12, 0, LFROM, 0},
Optab{AMOVF, C_FREG, C_NONE, C_ADDR, 68, 8, 0, LTO | LPCREL, 4},
Optab{AMOVF, C_ADDR, C_NONE, C_FREG, 69, 8, 0, LFROM | LPCREL, 4},
Optab{AADDF, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0},
Optab{AADDF, C_FREG, C_REG, C_FREG, 54, 4, 0, 0, 0},
Optab{AMOVF, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_FCR, 56, 4, 0, 0, 0},
Optab{AMOVW, C_FCR, C_NONE, C_REG, 57, 4, 0, 0, 0},
Optab{AMOVW, C_SHIFT, C_NONE, C_REG, 59, 4, 0, 0, 0},
Optab{AMOVBU, C_SHIFT, C_NONE, C_REG, 59, 4, 0, 0, 0},
Optab{AMOVB, C_SHIFT, C_NONE, C_REG, 60, 4, 0, 0, 0},
Optab{AMOVBS, C_SHIFT, C_NONE, C_REG, 60, 4, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_SHIFT, 61, 4, 0, 0, 0},
Optab{AMOVB, C_REG, C_NONE, C_SHIFT, 61, 4, 0, 0, 0},
Optab{AMOVBS, C_REG, C_NONE, C_SHIFT, 61, 4, 0, 0, 0},
Optab{AMOVBU, C_REG, C_NONE, C_SHIFT, 61, 4, 0, 0, 0},
Optab{ACASE, C_REG, C_NONE, C_NONE, 62, 4, 0, LPCREL, 8},
Optab{ABCASE, C_NONE, C_NONE, C_SBRA, 63, 4, 0, LPCREL, 0},
Optab{AMOVH, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0},
Optab{AMOVH, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0},
Optab{AMOVHS, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0},
Optab{AMOVHS, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0},
Optab{AMOVHU, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0},
Optab{AMOVHU, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0},
Optab{AMOVB, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0},
Optab{AMOVB, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0},
Optab{AMOVBS, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0},
Optab{AMOVBS, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0},
Optab{AMOVH, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0},
Optab{AMOVH, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0},
Optab{AMOVHS, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0},
Optab{AMOVHS, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0},
Optab{AMOVHU, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0},
Optab{AMOVHU, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0},
Optab{AMOVH, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0},
Optab{AMOVH, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0},
Optab{AMOVH, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4},
Optab{AMOVHS, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0},
Optab{AMOVHS, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0},
Optab{AMOVHS, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4},
Optab{AMOVHU, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0},
Optab{AMOVHU, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0},
Optab{AMOVHU, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4},
Optab{AMOVB, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0},
Optab{AMOVB, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0},
Optab{AMOVB, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVBS, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0},
Optab{AMOVBS, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0},
Optab{AMOVBS, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVH, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0},
Optab{AMOVH, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0},
Optab{AMOVH, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVHS, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0},
Optab{AMOVHS, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0},
Optab{AMOVHS, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4},
Optab{AMOVHU, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0},
Optab{AMOVHU, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0},
Optab{AMOVHU, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4},
Optab{ALDREX, C_SOREG, C_NONE, C_REG, 77, 4, 0, 0, 0},
Optab{ASTREX, C_SOREG, C_REG, C_REG, 78, 4, 0, 0, 0},
Optab{AMOVF, C_ZFCON, C_NONE, C_FREG, 80, 8, 0, 0, 0},
Optab{AMOVF, C_SFCON, C_NONE, C_FREG, 81, 4, 0, 0, 0},
Optab{ACMPF, C_FREG, C_REG, C_NONE, 82, 8, 0, 0, 0},
Optab{ACMPF, C_FREG, C_NONE, C_NONE, 83, 8, 0, 0, 0},
Optab{AMOVFW, C_FREG, C_NONE, C_FREG, 84, 4, 0, 0, 0},
Optab{AMOVWF, C_FREG, C_NONE, C_FREG, 85, 4, 0, 0, 0},
Optab{AMOVFW, C_FREG, C_NONE, C_REG, 86, 8, 0, 0, 0},
Optab{AMOVWF, C_REG, C_NONE, C_FREG, 87, 8, 0, 0, 0},
Optab{AMOVW, C_REG, C_NONE, C_FREG, 88, 4, 0, 0, 0},
Optab{AMOVW, C_FREG, C_NONE, C_REG, 89, 4, 0, 0, 0},
Optab{ATST, C_REG, C_NONE, C_NONE, 90, 4, 0, 0, 0},
Optab{ALDREXD, C_SOREG, C_NONE, C_REG, 91, 4, 0, 0, 0},
Optab{ASTREXD, C_SOREG, C_REG, C_REG, 92, 4, 0, 0, 0},
Optab{APLD, C_SOREG, C_NONE, C_NONE, 95, 4, 0, 0, 0},
Optab{obj.AUNDEF, C_NONE, C_NONE, C_NONE, 96, 4, 0, 0, 0},
Optab{ACLZ, C_REG, C_NONE, C_REG, 97, 4, 0, 0, 0},
Optab{AMULWT, C_REG, C_REG, C_REG, 98, 4, 0, 0, 0},
Optab{AMULAWT, C_REG, C_REG, C_REGREG2, 99, 4, 0, 0, 0},
Optab{obj.AUSEFIELD, C_ADDR, C_NONE, C_NONE, 0, 0, 0, 0, 0},
Optab{obj.APCDATA, C_LCON, C_NONE, C_LCON, 0, 0, 0, 0, 0},
Optab{obj.AFUNCDATA, C_LCON, C_NONE, C_ADDR, 0, 0, 0, 0, 0},
Optab{obj.ANOP, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0, 0},
Optab{obj.ADUFFZERO, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0}, // same as ABL
Optab{obj.ADUFFCOPY, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0}, // same as ABL
Optab{ADATABUNDLE, C_NONE, C_NONE, C_NONE, 100, 4, 0, 0, 0},
Optab{ADATABUNDLEEND, C_NONE, C_NONE, C_NONE, 100, 0, 0, 0, 0},
Optab{obj.AXXX, C_NONE, C_NONE, C_NONE, 0, 4, 0, 0, 0},
}
var pool struct {
start uint32
size uint32
extra uint32
}
var oprange [ALAST & obj.AMask]Oprang
var xcmp [C_GOK + 1][C_GOK + 1]uint8
var deferreturn *obj.LSym
/* size of a case statement including jump table */
func casesz(ctxt *obj.Link, p *obj.Prog) int32 {
var jt int = 0
var n int32 = 0
var o *Optab
for ; p != nil; p = p.Link {
if p.As == ABCASE {
jt = 1
} else if jt != 0 {
break
}
o = oplook(ctxt, p)
n += int32(o.size)
}
return n
}
// Note about encoding: Prog.scond holds the condition encoding,
// but XOR'ed with C_SCOND_XOR, so that C_SCOND_NONE == 0.
// The code that shifts the value << 28 has the responsibility
// for XORing with C_SCOND_XOR too.
// asmoutnacl assembles the instruction p. It replaces asmout for NaCl.
// It returns the total number of bytes put in out, and it can change
// p->pc if extra padding is necessary.
// In rare cases, asmoutnacl might split p into two instructions.
// origPC is the PC for this Prog (no padding is taken into account).
func asmoutnacl(ctxt *obj.Link, origPC int32, p *obj.Prog, o *Optab, out []uint32) int {
size := int(o.size)
// instruction specific
switch p.As {
default:
if out != nil {
asmout(ctxt, p, o, out)
}
case ADATABUNDLE, // align to 16-byte boundary
ADATABUNDLEEND: // zero width instruction, just to align next instruction to 16-byte boundary
p.Pc = (p.Pc + 15) &^ 15
if out != nil {
asmout(ctxt, p, o, out)
}
case obj.AUNDEF,
APLD:
size = 4
if out != nil {
switch p.As {
case obj.AUNDEF:
out[0] = 0xe7fedef0 // NACL_INSTR_ARM_ABORT_NOW (UDF #0xEDE0)
case APLD:
out[0] = 0xe1a01001 // (MOVW R1, R1)
}
}
case AB, ABL:
if p.To.Type != obj.TYPE_MEM {
if out != nil {
asmout(ctxt, p, o, out)
}
} else {
if p.To.Offset != 0 || size != 4 || p.To.Reg > REG_R15 || p.To.Reg < REG_R0 {
ctxt.Diag("unsupported instruction: %v", p)
}
if p.Pc&15 == 12 {
p.Pc += 4
}
if out != nil {
out[0] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x03c0013f | (uint32(p.To.Reg)&15)<<12 | (uint32(p.To.Reg)&15)<<16 // BIC $0xc000000f, Rx
if p.As == AB {
out[1] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x012fff10 | (uint32(p.To.Reg)&15)<<0 // BX Rx
} else { // ABL
out[1] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x012fff30 | (uint32(p.To.Reg)&15)<<0 // BLX Rx
}
}
size = 8
}
// align the last instruction (the actual BL) to the last instruction in a bundle
if p.As == ABL {
if deferreturn == nil {
deferreturn = obj.Linklookup(ctxt, "runtime.deferreturn", 0)
}
if p.To.Sym == deferreturn {
p.Pc = ((int64(origPC) + 15) &^ 15) + 16 - int64(size)
} else {
p.Pc += (16 - ((p.Pc + int64(size)) & 15)) & 15
}
}
case ALDREX,
ALDREXD,
AMOVB,
AMOVBS,
AMOVBU,
AMOVD,
AMOVF,
AMOVH,
AMOVHS,
AMOVHU,
AMOVM,
AMOVW,
ASTREX,
ASTREXD:
if p.To.Type == obj.TYPE_REG && p.To.Reg == REG_R15 && p.From.Reg == REG_R13 { // MOVW.W x(R13), PC
if out != nil {
asmout(ctxt, p, o, out)
}
if size == 4 {
if out != nil {
// Note: 5c and 5g reg.c know that DIV/MOD smashes R12
// so that this return instruction expansion is valid.
out[0] = out[0] &^ 0x3000 // change PC to R12
out[1] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x03ccc13f // BIC $0xc000000f, R12
out[2] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x012fff1c // BX R12
}
size += 8
if (p.Pc+int64(size))&15 == 4 {
p.Pc += 4
}
break
} else {
// if the instruction used more than 4 bytes, then it must have used a very large
// offset to update R13, so we need to additionally mask R13.
if out != nil {
out[size/4-1] &^= 0x3000 // change PC to R12
out[size/4] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x03cdd103 // BIC $0xc0000000, R13
out[size/4+1] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x03ccc13f // BIC $0xc000000f, R12
out[size/4+2] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x012fff1c // BX R12
}
// p->pc+size is only ok at 4 or 12 mod 16.
if (p.Pc+int64(size))%8 == 0 {
p.Pc += 4
}
size += 12
break
}
}
if p.To.Type == obj.TYPE_REG && p.To.Reg == REG_R15 {
ctxt.Diag("unsupported instruction (move to another register and use indirect jump instead): %v", p)
}
if p.To.Type == obj.TYPE_MEM && p.To.Reg == REG_R13 && (p.Scond&C_WBIT != 0) && size > 4 {
// function prolog with very large frame size: MOVW.W R14,-100004(R13)
// split it into two instructions:
// ADD $-100004, R13
// MOVW R14, 0(R13)
q := ctxt.NewProg()
p.Scond &^= C_WBIT
*q = *p
a := &p.To
var a2 *obj.Addr
if p.To.Type == obj.TYPE_MEM {
a2 = &q.To
} else {
a2 = &q.From
}
obj.Nocache(q)
obj.Nocache(p)
// insert q after p
q.Link = p.Link
p.Link = q
q.Pcond = nil
// make p into ADD $X, R13
p.As = AADD
p.From = *a
p.From.Reg = 0
p.From.Type = obj.TYPE_CONST
p.To = obj.Addr{}
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R13
// make q into p but load/store from 0(R13)
q.Spadj = 0
*a2 = obj.Addr{}
a2.Type = obj.TYPE_MEM
a2.Reg = REG_R13
a2.Sym = nil
a2.Offset = 0
size = int(oplook(ctxt, p).size)
break
}
if (p.To.Type == obj.TYPE_MEM && p.To.Reg != REG_R13 && p.To.Reg != REG_R9) || // MOVW Rx, X(Ry), y != 13 && y != 9
(p.From.Type == obj.TYPE_MEM && p.From.Reg != REG_R13 && p.From.Reg != REG_R9) { // MOVW X(Rx), Ry, x != 13 && x != 9
var a *obj.Addr
if p.To.Type == obj.TYPE_MEM {
a = &p.To
} else {
a = &p.From
}
reg := int(a.Reg)
if size == 4 {
// if addr.reg == 0, then it is probably load from x(FP) with small x, no need to modify.
if reg == 0 {
if out != nil {
asmout(ctxt, p, o, out)
}
} else {
if out != nil {
out[0] = ((uint32(p.Scond)&C_SCOND)^C_SCOND_XOR)<<28 | 0x03c00103 | (uint32(reg)&15)<<16 | (uint32(reg)&15)<<12 // BIC $0xc0000000, Rx
}
if p.Pc&15 == 12 {
p.Pc += 4
}
size += 4
if out != nil {
asmout(ctxt, p, o, out[1:])
}
}
break
} else {
// if a load/store instruction takes more than 1 word to implement, then
// we need to separate the instruction into two:
// 1. explicitly load the address into R11.
// 2. load/store from R11.
// This won't handle .W/.P, so we should reject such code.
if p.Scond&(C_PBIT|C_WBIT) != 0 {
ctxt.Diag("unsupported instruction (.P/.W): %v", p)
}
q := ctxt.NewProg()
*q = *p
var a2 *obj.Addr
if p.To.Type == obj.TYPE_MEM {
a2 = &q.To
} else {
a2 = &q.From
}
obj.Nocache(q)
obj.Nocache(p)
// insert q after p
q.Link = p.Link
p.Link = q
q.Pcond = nil
// make p into MOVW $X(R), R11
p.As = AMOVW
p.From = *a
p.From.Type = obj.TYPE_ADDR
p.To = obj.Addr{}
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R11
// make q into p but load/store from 0(R11)
*a2 = obj.Addr{}
a2.Type = obj.TYPE_MEM
a2.Reg = REG_R11
a2.Sym = nil
a2.Offset = 0
size = int(oplook(ctxt, p).size)
break
}
} else if out != nil {
asmout(ctxt, p, o, out)
}
}
// destination register specific
if p.To.Type == obj.TYPE_REG {
switch p.To.Reg {
case REG_R9:
ctxt.Diag("invalid instruction, cannot write to R9: %v", p)
case REG_R13:
if out != nil {
out[size/4] = 0xe3cdd103 // BIC $0xc0000000, R13
}
if (p.Pc+int64(size))&15 == 0 {
p.Pc += 4
}
size += 4
}
}
return size
}
func span5(ctxt *obj.Link, cursym *obj.LSym) {
var p *obj.Prog
var op *obj.Prog
p = cursym.Text
if p == nil || p.Link == nil { // handle external functions and ELF section symbols
return
}
if oprange[AAND&obj.AMask].start == nil {
buildop(ctxt)
}
ctxt.Cursym = cursym
ctxt.Autosize = int32(p.To.Offset + 4)
c := int32(0)
op = p
p = p.Link
var i int
var m int
var o *Optab
for ; p != nil || ctxt.Blitrl != nil; op, p = p, p.Link {
if p == nil {
if checkpool(ctxt, op, 0) {
p = op
continue
}
// can't happen: blitrl is not nil, but checkpool didn't flushpool
ctxt.Diag("internal inconsistency")
break
}
ctxt.Curp = p
p.Pc = int64(c)
o = oplook(ctxt, p)
if ctxt.Headtype != obj.Hnacl {
m = int(o.size)
} else {
m = asmoutnacl(ctxt, c, p, o, nil)
c = int32(p.Pc) // asmoutnacl might change pc for alignment
o = oplook(ctxt, p) // asmoutnacl might change p in rare cases
}
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("!pc invalid: %v size=%d", p, m)
}
// must check literal pool here in case p generates many instructions
if ctxt.Blitrl != nil {
i = m
if p.As == ACASE {
i = int(casesz(ctxt, p))
}
if checkpool(ctxt, op, i) {
p = op
continue
}
}
if m == 0 && (p.As != obj.AFUNCDATA && p.As != obj.APCDATA && p.As != ADATABUNDLEEND && p.As != obj.ANOP) {
ctxt.Diag("zero-width instruction\n%v", p)
continue
}
switch o.flag & (LFROM | LTO | LPOOL) {
case LFROM:
addpool(ctxt, p, &p.From)
case LTO:
addpool(ctxt, p, &p.To)
case LPOOL:
if p.Scond&C_SCOND == C_SCOND_NONE {
flushpool(ctxt, p, 0, 0)
}
}
if p.As == AMOVW && p.To.Type == obj.TYPE_REG && p.To.Reg == REGPC && p.Scond&C_SCOND == C_SCOND_NONE {
flushpool(ctxt, p, 0, 0)
}
c += int32(m)
}
cursym.Size = int64(c)
/*
* if any procedure is large enough to
* generate a large SBRA branch, then
* generate extra passes putting branches
* around jmps to fix. this is rare.
*/
times := 0
var bflag int
var opc int32
var out [6 + 3]uint32
for {
if ctxt.Debugvlog != 0 {
fmt.Fprintf(ctxt.Bso, "%5.2f span1\n", obj.Cputime())
}
bflag = 0
c = 0
times++
cursym.Text.Pc = 0 // force re-layout the code.
for p = cursym.Text; p != nil; p = p.Link {
ctxt.Curp = p
o = oplook(ctxt, p)
if int64(c) > p.Pc {
p.Pc = int64(c)
}
/* very large branches
if(o->type == 6 && p->pcond) {
otxt = p->pcond->pc - c;
if(otxt < 0)
otxt = -otxt;
if(otxt >= (1L<<17) - 10) {
q = emallocz(sizeof(Prog));
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = TYPE_BRANCH;
q->pcond = p->pcond;
p->pcond = q;
q = emallocz(sizeof(Prog));
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = TYPE_BRANCH;
q->pcond = q->link->link;
bflag = 1;
}
}
*/
opc = int32(p.Pc)
if ctxt.Headtype != obj.Hnacl {
m = int(o.size)
} else {
m = asmoutnacl(ctxt, c, p, o, nil)
}
if p.Pc != int64(opc) {
bflag = 1
}
//print("%v pc changed %d to %d in iter. %d\n", p, opc, (int32)p->pc, times);
c = int32(p.Pc + int64(m))
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("pc invalid: %v size=%d", p, m)
}
if m/4 > len(out) {
ctxt.Diag("instruction size too large: %d > %d", m/4, len(out))
}
if m == 0 && (p.As != obj.AFUNCDATA && p.As != obj.APCDATA && p.As != ADATABUNDLEEND && p.As != obj.ANOP) {
if p.As == obj.ATEXT {
ctxt.Autosize = int32(p.To.Offset + 4)
continue
}
ctxt.Diag("zero-width instruction\n%v", p)
continue
}
}
cursym.Size = int64(c)
if bflag == 0 {
break
}
}
if c%4 != 0 {
ctxt.Diag("sym->size=%d, invalid", c)
}
/*
* lay out the code. all the pc-relative code references,
* even cross-function, are resolved now;
* only data references need to be relocated.
* with more work we could leave cross-function
* code references to be relocated too, and then
* perhaps we'd be able to parallelize the span loop above.
*/
if ctxt.Tlsg == nil {
ctxt.Tlsg = obj.Linklookup(ctxt, "runtime.tlsg", 0)
}
p = cursym.Text
ctxt.Autosize = int32(p.To.Offset + 4)
obj.Symgrow(ctxt, cursym, cursym.Size)
bp := cursym.P
c = int32(p.Pc) // even p->link might need extra padding
var v int
for p = p.Link; p != nil; p = p.Link {
ctxt.Pc = p.Pc
ctxt.Curp = p
o = oplook(ctxt, p)
opc = int32(p.Pc)
if ctxt.Headtype != obj.Hnacl {
asmout(ctxt, p, o, out[:])
m = int(o.size)
} else {
m = asmoutnacl(ctxt, c, p, o, out[:])
if int64(opc) != p.Pc {
ctxt.Diag("asmoutnacl broken: pc changed (%d->%d) in last stage: %v", opc, int32(p.Pc), p)
}
}
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("final stage: pc invalid: %v size=%d", p, m)
}
if int64(c) > p.Pc {
ctxt.Diag("PC padding invalid: want %#d, has %#d: %v", p.Pc, c, p)
}
for int64(c) != p.Pc {
// emit 0xe1a00000 (MOVW R0, R0)
bp[0] = 0x00
bp = bp[1:]
bp[0] = 0x00
bp = bp[1:]
bp[0] = 0xa0
bp = bp[1:]
bp[0] = 0xe1
bp = bp[1:]
c += 4
}
for i = 0; i < m/4; i++ {
v = int(out[i])
bp[0] = byte(v)
bp = bp[1:]
bp[0] = byte(v >> 8)
bp = bp[1:]
bp[0] = byte(v >> 16)
bp = bp[1:]
bp[0] = byte(v >> 24)
bp = bp[1:]
}
c += int32(m)
}
}
/*
* when the first reference to the literal pool threatens
* to go out of range of a 12-bit PC-relative offset,
* drop the pool now, and branch round it.
* this happens only in extended basic blocks that exceed 4k.
*/
func checkpool(ctxt *obj.Link, p *obj.Prog, sz int) bool {
if pool.size >= 0xff0 || immaddr(int32((p.Pc+int64(sz)+4)+4+int64(12+pool.size)-int64(pool.start+8))) == 0 {
return flushpool(ctxt, p, 1, 0)
} else if p.Link == nil {
return flushpool(ctxt, p, 2, 0)
}
return false
}
func flushpool(ctxt *obj.Link, p *obj.Prog, skip int, force int) bool {
if ctxt.Blitrl != nil {
if skip != 0 {
if false && skip == 1 {
fmt.Printf("note: flush literal pool at %x: len=%d ref=%x\n", uint64(p.Pc+4), pool.size, pool.start)
}
q := ctxt.NewProg()
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = p.Link
q.Link = ctxt.Blitrl
q.Lineno = p.Lineno
ctxt.Blitrl = q
} else if force == 0 && (p.Pc+int64(12+pool.size)-int64(pool.start) < 2048) { // 12 take into account the maximum nacl literal pool alignment padding size
return false
}
if ctxt.Headtype == obj.Hnacl && pool.size%16 != 0 {
// if pool is not multiple of 16 bytes, add an alignment marker
q := ctxt.NewProg()
q.As = ADATABUNDLEEND
ctxt.Elitrl.Link = q
ctxt.Elitrl = q
}
ctxt.Elitrl.Link = p.Link
p.Link = ctxt.Blitrl
// BUG(minux): how to correctly handle line number for constant pool entries?
// for now, we set line number to the last instruction preceding them at least
// this won't bloat the .debug_line tables
for ctxt.Blitrl != nil {
ctxt.Blitrl.Lineno = p.Lineno
ctxt.Blitrl = ctxt.Blitrl.Link
}
ctxt.Blitrl = nil /* BUG: should refer back to values until out-of-range */
ctxt.Elitrl = nil
pool.size = 0
pool.start = 0
pool.extra = 0
return true
}
return false
}
func addpool(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) {
var t obj.Prog
c := aclass(ctxt, a)
t.Ctxt = ctxt
t.As = AWORD
switch c {
default:
t.To.Offset = a.Offset
t.To.Sym = a.Sym
t.To.Type = a.Type
t.To.Name = a.Name
if ctxt.Flag_shared != 0 && t.To.Sym != nil {
t.Rel = p
}
case C_SROREG,
C_LOREG,
C_ROREG,
C_FOREG,
C_SOREG,
C_HOREG,
C_FAUTO,
C_SAUTO,
C_LAUTO,
C_LACON:
t.To.Type = obj.TYPE_CONST
t.To.Offset = ctxt.Instoffset
}
if t.Rel == nil {
for q := ctxt.Blitrl; q != nil; q = q.Link { /* could hash on t.t0.offset */
if q.Rel == nil && q.To == t.To {
p.Pcond = q
return
}
}
}
if ctxt.Headtype == obj.Hnacl && pool.size%16 == 0 {
// start a new data bundle
q := ctxt.NewProg()
q.As = ADATABUNDLE
q.Pc = int64(pool.size)
pool.size += 4
if ctxt.Blitrl == nil {
ctxt.Blitrl = q
pool.start = uint32(p.Pc)
} else {
ctxt.Elitrl.Link = q
}
ctxt.Elitrl = q
}
q := ctxt.NewProg()
*q = t
q.Pc = int64(pool.size)
if ctxt.Blitrl == nil {
ctxt.Blitrl = q
pool.start = uint32(p.Pc)
} else {
ctxt.Elitrl.Link = q
}
ctxt.Elitrl = q
pool.size += 4
p.Pcond = q
}
func regoff(ctxt *obj.Link, a *obj.Addr) int32 {
ctxt.Instoffset = 0
aclass(ctxt, a)
return int32(ctxt.Instoffset)
}
func immrot(v uint32) int32 {
for i := 0; i < 16; i++ {
if v&^0xff == 0 {
return int32(uint32(int32(i)<<8) | v | 1<<25)
}
v = v<<2 | v>>30
}
return 0
}
func immaddr(v int32) int32 {
if v >= 0 && v <= 0xfff {
return v&0xfff | 1<<24 | 1<<23 /* pre indexing */ /* pre indexing, up */
}
if v >= -0xfff && v < 0 {
return -v&0xfff | 1<<24 /* pre indexing */
}
return 0
}
func immfloat(v int32) bool {
return v&0xC03 == 0 /* offset will fit in floating-point load/store */
}
func immhalf(v int32) bool {
if v >= 0 && v <= 0xff {
return v|1<<24|1<<23 != 0 /* pre indexing */ /* pre indexing, up */
}
if v >= -0xff && v < 0 {
return -v&0xff|1<<24 != 0 /* pre indexing */
}
return false
}