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1 | #include <stdio.h> | |
2 | #include "fakeasm.h" | |
3 | typedef unsigned char u8; | |
4 | ||
5 | u8 data[] = { | |
6 | 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58, | |
7 | 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58 | |
8 | }; | |
9 | u8 zero; //zero register | |
10 | u8 i0; | |
11 | u8 i1; | |
12 | u8 i2; | |
13 | u8 i3; | |
14 | u8 x; | |
15 | u8 t; | |
16 | u8 o; | |
17 | u8 _; | |
18 | #define Mh o //mod3 vars | |
19 | #define Ml t // -"- | |
20 | void mod3(void) { //avail: t, o _ | |
21 | //http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml | |
22 | #define tmp _ | |
23 | ADD (Ml, Mh) | |
24 | CLR (Mh) | |
25 | ADC (Mh, zero, carry) //Mh only holds the carry bit | |
26 | MOV (tmp, Ml) | |
27 | SWAP (tmp) | |
28 | ANDI (tmp, 0x0f) | |
29 | SWAP (Mh) | |
30 | OR (tmp, Mh) | |
31 | Ml = (tmp) + (Ml & 0xF); | |
32 | Ml = (Ml >> 2) + (Ml & 0x3); | |
33 | Ml = (Ml >> 2) + (Ml & 0x3); | |
34 | if (Ml > 2) Ml = Ml - 3; | |
35 | #undef tmp | |
36 | } | |
37 | void g(void) { | |
38 | // g(i, x, t, o) -> t | |
39 | #define tmp _ | |
40 | ANDI (t, 0x07) | |
41 | MOV (tmp, i2) | |
42 | ANDI (tmp, 3) | |
43 | TST (tmp) | |
44 | #undef tmp | |
45 | BREQ (skip) | |
46 | SUBI (t, -8) | |
47 | skip: | |
48 | t = data[t]; | |
49 | /*MOV X_hi==_, data_hi | |
50 | MOV X_lo==t, data_lo | |
51 | ADD X_lo, t | |
52 | ADC X_hi, zero | |
53 | LD t, X */ | |
54 | t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO | |
55 | t >>= o; //NOTE: o == {1, 2, 4} | |
56 | AND (t, x) | |
57 | ANDI (t, 3) | |
58 | RET | |
59 | }; | |
60 | ||
61 | int main(void) { | |
62 | u8 n; | |
63 | u8 s; | |
64 | u8 acc; | |
65 | //TODO: clear all vars/registers | |
66 | for (;;) { | |
67 | MOV (n, i2) | |
68 | LSL (n) | |
69 | LSL (n) | |
70 | #define tmp acc | |
71 | MOV (tmp, i1) | |
72 | SWAP (tmp) | |
73 | ANDI (tmp, 0x0f) | |
74 | LSR (tmp) | |
75 | LSR (tmp) | |
76 | OR (n, tmp) | |
77 | #undef tmp | |
78 | MOV (s, i3) | |
79 | ROR (s) | |
80 | ROR (s) | |
81 | ANDI (s, 0x80) | |
82 | #define tmp acc | |
83 | MOV (tmp, i2) | |
84 | LSR (tmp) | |
85 | OR (s, tmp) | |
86 | #undef tmp | |
87 | ||
88 | //voice 1: | |
89 | LDI (x, 1) | |
90 | MOV (t, n) | |
91 | LDI (o, 4) | |
92 | RCALL g(); | |
93 | MOV (acc, t) | |
94 | ||
95 | //voice 2: | |
96 | MOV (x, s) | |
97 | #define tmp o | |
98 | MOV (tmp, i2) | |
99 | LSL (tmp) | |
100 | LSL (tmp) | |
101 | LSL (tmp) | |
102 | MOV (t, i1) | |
103 | SWAP (t) | |
104 | ANDI (t, 0xf) | |
105 | LSR (t) | |
106 | OR (t, tmp) | |
107 | #undef tmp | |
108 | EOR (t, n) | |
109 | LDI (o, 2) | |
110 | RCALL g(); | |
111 | ADD (acc, t) | |
112 | ||
113 | //voice 3: | |
114 | MOV (x, s) | |
115 | INC (x) | |
116 | #define tmp o | |
117 | MOV (tmp, x) | |
118 | LSR (tmp) | |
119 | LSR (tmp) | |
120 | ADD (tmp, x) | |
121 | ROR (tmp) | |
122 | LSR (tmp) | |
123 | ADD (tmp, x) | |
124 | ROR (tmp) | |
125 | LSR (tmp) | |
126 | ADD (tmp, x) | |
127 | ROR (tmp) | |
128 | LSR (tmp) | |
129 | MOV (x, tmp) | |
130 | #undef tmp | |
131 | Ml = i2<<5 | i1>>3; | |
132 | Mh = i3<<5 | i2>>3; | |
133 | RCALL mod3(); | |
134 | ADD (t, n) | |
135 | LDI (o, 2) | |
136 | RCALL g(); | |
137 | ADD (acc, t) | |
138 | ||
139 | //voice 4: | |
140 | MOV (x, s) | |
141 | INC (x) | |
142 | #define tmp o | |
143 | MOV (tmp, x) | |
144 | LSR (tmp) | |
145 | ADD (tmp, x) | |
146 | ROR (tmp) | |
147 | LSR (tmp) | |
148 | LSR (tmp) | |
149 | ADD (tmp, x) | |
150 | ROR (tmp) | |
151 | ADD (tmp, x) | |
152 | ROR (tmp) | |
153 | LSR (tmp) | |
154 | LSR (tmp) | |
155 | MOV (x, tmp) | |
156 | #undef tmp | |
157 | Ml = i2<<6 | i1>>2; | |
158 | Mh = i3<<6 | i2>>2; | |
159 | RCALL mod3(); | |
160 | SUB (t, n) | |
161 | NEG (t) | |
162 | SUBI (t, -8) | |
163 | LDI (o, 1) | |
164 | RCALL g(); | |
165 | ADD (acc, t) | |
166 | ||
167 | putchar(acc<<4); //TODO | |
168 | SUBI (i0, -1) | |
169 | ADC (i1, zero, !i0) | |
170 | ADC (i2, zero, !i0&&!i1) | |
171 | ADC (i3, zero, !i0&&!i1&&!i2) | |
172 | } | |
173 | } |