-
Notifications
You must be signed in to change notification settings - Fork 7
/
cc68.rules
1133 lines (1019 loc) · 9.63 KB
/
cc68.rules
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
# Trim jumps to next instruction
jmp %1
%1:
=
%1:
# And terminal jsr rts
jsr %1
rts
=
jmp %1
# Indirect function calls can go via x when we are loading the value
# from a target just before the branch
ldd %1
xgdx
jsr ,x
=
ldx %1
jsr ,x
# Double exchanges
xgdx; XtoD
xgdx; DtoX
=
;
# Double exchanges
xgdx
xgdx
=
;
# Double push of constant
# We could also do static but we have no visibility into volatiles yet
ldx #%1
pshx
ldx #%1
=
ldx #%1
pshx
ldx @%1
pshx
ldx @%1
=
ldx @%1
pshx
# int foo = something; func(foo, ....)
pshx
;invalid XDP
tsx
ldx $01,x
pshx
=
pshx
pshx
# Silly logic removals
ldd @one
staa @tmp1
orab @tmp1
jne %1
=
ldd @one
jne %1
# Some trivial optimizations for clra/clrb cases
ldd @one
stab %1
clra
clrb
=
ldd @one
stab %1
decb
clra
clrb
stab %1
clra
clrb
=
clra
clrb
stab %1
ldd @one
std %1
clra
clrb
=
ldd @one
std %1
decb
clra
clrb
std %1
clra
clrb
=
clra
clrb
std %1
# And with D,P
clra
clrb
stab %1
;invalid DP
clra
clrb
=
clra
clrb
stab %1
;invalid DP
ldd @one
std %1
;invalid DP
clra
clrb
=
ldd @one
std %1
decb
;invalid DP
clra
clrb
std %1
;invalid DP
clra
clrb
=
clra
clrb
std %1
;invalid DP
# And with X,D,P
clra
clrb
stab %1
;invalid XDP
clra
clrb
=
clra
clrb
stab %1
;invalid XDP
ldd @one
std %1
;invalid XDP
clra
clrb
=
ldd @one
std %1
decb
;invalid XDP
clra
clrb
std %1
;invalid XDP
clra
clrb
=
clra
clrb
std %1
;invalid XDP
clra
clra
=
clra
clrb
pshb
;invalid DP
clrb
pshb
=
clrb
pshb
pshb
;invalid DP
clra
pshb
;invalid DP
clra
=
clra
pshb
;invalid DP
clra
clrb
std %1
;invalid DP
clra
clrb
=
clra
clrb
std %1
;invalid DP
clra
clrb
std %1
;invalid XDP
clra
clrb
=
clra
clrb
std %1
;invalid XDP
# Similar idea for constants
ldab #%1
pshb
;invalid DP
ldab #%1
=
ldab #%1
pshb
;invalid DP
# Where logic tells us clr is not needed
subd %1
jne %2
clra
=
subd %1
jne %2
# Make exchange and push more efficient
xgdx; XtoD
pshb
psha
=
pshx
xgdx; XtoD
xgdx; DtoX
pshb
psha
=
pshx
xgdx; XtoD
# Useful overlaps to spot
clrb
pshb
ldab #$FF
=
clrb
pshb
decb
# Push of postinc/dec static/global
stx _%1
dex
stx @tmp
ldd @tmp
ldd _%1
pshb
psha
;invalid XDP
=
stx _%1
pshx
stx _%1
inx
stx @tmp
ldd @tmp
ldd _%1
pshb
psha
;invalid XDP
=
stx _%1
pshx
# Store and reload
std %1
ldd %1
=
std %1
stx %1
ldx %1
=
stx %1
std %1
;invalid DP
ldd %1
=
std %1
std %1
;invalid XDP
ldd %1
=
std %1
# Some classes of compare
# Simple check on 8bit versus 0 (safe only due to compiler behaviour)
clra
ldab %1
jne %2
L%3
ldd %4
=
ldab %1
jne %2
L%3
ldd %4
clra
ldab %1
jne %2
ldd %3
=
ldab %1
jne %2
# Pointless stack
pshb
pulb
=
;
pshx
pulx
=
;
pshb
psha
pula
pulb
=
;
pula
pulb
pshb
psha
ldd %1
=
ldd %1
pula
pulb
pshb
psha
clra
ldab %1
=
clra
ldab %1
pula
pulb
pshb
psha
clra
clrb
=
clra
clrb
# Turn pula/pulb/xgdx into pulx. This should be safe without a check
# we then load D but might need a hint adding
pula
pulb
xgdx; DtoX
=
pulx
# DP optimized constants
#
clra
ldab #$01
=
ldd @one
addd #$0001
=
addd @one
# Branches
#
%1:
jmp %2
%3:
jmp %1
=
%1:
%3:
jmp %2
# Review more conditions
jne %1
jmp %2
%1:
=
jeq %2
%1:
jeq %1
jmp %2
%1:
=
jne %2
%1:
jcc %1
jmp %2
%1:
=
jcs %2
%1:
jcs %1
jmp %2
%1:
=
jcc %2
%1:
# Fix up some of the X cases
# Push and then invalidate D so can use X
ldd %1
pshb
psha
;invalid XDP
=
ldx %1
pshx
;invalid XDP
# Push and then invalidate D so can use X single arg entry, with label
ldd %1
pshb
psha
%2:
;invalid XDP
=
ldx %1
pshx
%2:
;invalid XDP
# Stack via X
ldd %1
pshb
psha
;invalid XDP
=
ldx %1
pshx
# Stack via X when there is a further argument stacked via X which does
# not use X (either constant or static (# or _)). We cannot do this for
# locals as they will use ,x in the second load and a tsx is no cheaper
# we can't easily do this for all combinations unfortunately because
# we also need to check there are no ,x dependencies further down the chain
# until we hit the jsr _func
#
# TODO: add @zero and @one match forms ditto clra/clrb ones ?
#
# func(arg,const)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
jsr _%3
=
ldx %1
pshx
ldx #%2
pshx
;invalid DP
jsr _%3
# func(arg, static)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
jsr _%3
=
ldx %1
pshx
ldx _%2
pshx
;invalid DP
jsr _%3
# func(arg, const, const)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
ldd #%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx #%2
pshx
ldx #%3
pshx
;invalid DP
jsr _%4
# func(arg, const, static)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
ldd _%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx #%2
pshx
ldx _%3
pshx
;invalid DP
jsr _%4
# func(arg, static, const)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
ldd #%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx _%2
pshx
ldx #%3
pshx
;invalid DP
jsr _%4
# func(arg, static, static)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
ldd _%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx _%2
pshx
ldx _%3
pshx
;invalid DP
jsr _%4
# Stack via X when X is live but we are calling a user function so _xyz
ldd %1
pshb
psha
;invalid DP
jsr _%2
=
ldx %1
pshx
;invalid DP
jsr _%2
# Stack via X because we can see a non X dependent X load following
ldd %1
pshb
psha
ldx @%2
=
ldx %1
pshx
ldx @%2
ldd %1
pshb
psha
ldx _%2
=
ldx %1
pshx
ldx _%2
ldd %1
pshb
psha
ldx #%2
=
ldx %1
pshx
ldx #%2
# Clean up trailing references from things like p++;
ldd %1
L%2
ldd %3
=
L%2
ldd %3
ldd %1
ldd %2
=
ldd %2
# n++/n-- with unused result
ldd %1
pshb
psha
addd %2
std %1
pula
pulb
ldd %3
=
ldd %1
addd %2
std %1
ldd %3
# Optimize a few pull sequences where we can see X is not live
pula
pulb
L%1:
tsx
=
pulx
L%1:
tsx
pula
pulb
tsx
=
pulx
tsx
pula
pulb
pulx
=
pulx
pulx
pula
pulb
;invalid XDP
=
pulx
;invalid XDP
ldd %1
pshb
psha
tsx
ldd %2
=
ldx %1
pshx
tsx
ldd %2
# Some useful tricks with comparisons. Where the comparison sets the flags
# and the next thing we do is to do a conditional based on them we can
# eliminate the test function. Look at the others as we clean them up
# in the compiler
jsr booleq
jeq %1
=
jne %1
jsr boolne
jne %1
=
jne %1
# Clean up tsx tsx
tsx
tsx
=
tsx
# We have a more general issue of cases where we shouldn't go via the
# stack at all to address - eg 16bit compare with static. Until we fix
# the compiler address them here
ldd %1
pshb
psha
ldd %2
tsx
subd $00,x
pulx
=
ldd %2
subd %1
ldd %1
pshb
psha
ldd %2
tsx
addd $00,x
pulx
=
ldd %1
addd %2
ldd %1
pshb
psha
ldd %2
subd $00,x
pulx
=
ldd %2
subd %1
ldd %1
pshb
psha
ldd %2
addd $00,x
pulx
=
ldd %1
addd %2
# re-order constant subtract
ldx %1
pshx
ldd #%2
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd #%2
ldx %1
pshx
ldd @one
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd @one
# re-order constant add
ldx %1
pshx
ldd #%2
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd #%2
ldx %1
pshx
ldd @one
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd @one
# re-order some assignments of constant to computed address
# Can't do this for locals (we need X then)
# Int versions then char versions
ldd %1
pshb
psha
ldd #%2
pulx
std %3
=
ldx %1
ldd #%2
std %3
ldd %1
pshb
psha
ldd @%2
pulx
std %3
=
ldx %1
ldd @%2
std %3
ldd %1
pshb
psha
ldd _%2
pulx
std %3
=
ldx %1
ldd _%2
std %3
ldd %1
pshb
psha
ldd #%2
pulx
stab %3
=
ldx %1
ldd #%2
stab %3
ldd %1
pshb
psha
ldd @%2
pulx
stab %3
=
ldx %1
ldd @%2
stab %3
ldd %1
pshb
psha
ldd _%2
pulx
stab %3
=
ldx %1
ldd _%2
stab %3
# Spot logic operations where we can use x to avoid going over the stack
# We can't handle all cases because if the second op is ,x then we lose
ldd %1
pshb
psha
ldd #%2
tsx
=
ldx %1
pshx
ldd #%2
tsx
ldd %1
pshb
psha
ldd _%2
tsx
=
ldx %1
pshx
ldd _%2
tsx
# Repeat clears for 8bit work
clra
ldab %1
clra
=
clra
ldab %1
clra
clrb
stab %1
tsx
ldd %2
=
clrb
stab %1
tsx
ldd %2
clra
clrb
stab %1
ldd %2
=
clrb
stab %1
ldd %2
clra
clrb
stab %1
ldd %2
=
clrb
stab %1
ldd %2
# Pointer chases that can use X directly
ldd %1
std @tmp
ldx @tmp
ldd %2
=
ldx %1
ldd %2
ldd %1
std @tmp
ldx @tmp
clra
ldab%2
=
ldx %1
clra
ldab %2
ldd %1
pshb
psha
std @tmp