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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 | //http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml | |
21 | void mod3(void) { | |
22 | // mod3(Mh.Ml) -> t | |
23 | #define tmp _ | |
24 | ADD (Ml, Mh) | |
25 | CLR (Mh) | |
26 | ADC (Mh, zero, carry) //Mh only holds the carry bit | |
27 | MOV (tmp, Ml) | |
28 | SWAP (tmp) | |
29 | ANDI (tmp, 0x0f) | |
30 | SWAP (Mh) | |
31 | OR (tmp, Mh) | |
32 | ANDI (Ml, 0x0f) | |
33 | ADD (Ml, tmp) | |
34 | MOV (tmp, Ml) | |
35 | LSR (tmp) | |
36 | LSR (tmp) | |
37 | ANDI (Ml, 0x03) | |
38 | ADD (Ml, tmp) | |
39 | MOV (tmp, Ml) | |
40 | LSR (tmp) | |
41 | LSR (tmp) | |
42 | ANDI (Ml, 0x03) | |
43 | ADD (Ml, tmp) | |
44 | CPI (Ml, 3) | |
45 | BRPL (skip) | |
46 | SUBI (Ml, 3) | |
47 | skip:; | |
48 | #undef tmp | |
49 | } | |
50 | void g(void) { | |
51 | // g(i, x, t, o) -> t | |
52 | #define tmp _ | |
53 | ANDI (t, 0x07) | |
54 | MOV (tmp, i2) | |
55 | ANDI (tmp, 3) | |
56 | TST (tmp) | |
57 | #undef tmp | |
58 | BREQ (skip) | |
59 | SUBI (t, -8) | |
60 | skip: | |
61 | t = data[t]; | |
62 | /*MOV X_hi==_, data_hi | |
63 | MOV X_lo==t, data_lo | |
64 | ADD X_lo, t | |
65 | ADC X_hi, zero | |
66 | LD t, X */ | |
67 | t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO | |
68 | t >>= o; //NOTE: o == {1, 2, 4} | |
69 | AND (t, x) | |
70 | ANDI (t, 3) | |
71 | RET | |
72 | }; | |
73 | ||
74 | int main(void) { | |
75 | u8 n; | |
76 | u8 s; | |
77 | u8 acc; | |
78 | //TODO: clear all vars/registers | |
79 | for (;;) { | |
80 | MOV (n, i2) | |
81 | LSL (n) | |
82 | LSL (n) | |
83 | #define tmp acc | |
84 | MOV (tmp, i1) | |
85 | SWAP (tmp) | |
86 | ANDI (tmp, 0x0f) | |
87 | LSR (tmp) | |
88 | LSR (tmp) | |
89 | OR (n, tmp) | |
90 | #undef tmp | |
91 | MOV (s, i3) | |
92 | ROR (s) | |
93 | ROR (s) | |
94 | ANDI (s, 0x80) | |
95 | #define tmp acc | |
96 | MOV (tmp, i2) | |
97 | LSR (tmp) | |
98 | OR (s, tmp) | |
99 | #undef tmp | |
100 | ||
101 | //voice 1: | |
102 | LDI (x, 1) | |
103 | MOV (t, n) | |
104 | LDI (o, 4) | |
105 | RCALL g(); | |
106 | MOV (acc, t) | |
107 | ||
108 | //voice 2: | |
109 | MOV (x, s) | |
110 | #define tmp o | |
111 | MOV (tmp, i2) | |
112 | LSL (tmp) | |
113 | LSL (tmp) | |
114 | LSL (tmp) | |
115 | MOV (t, i1) | |
116 | SWAP (t) | |
117 | ANDI (t, 0xf) | |
118 | LSR (t) | |
119 | OR (t, tmp) | |
120 | #undef tmp | |
121 | EOR (t, n) | |
122 | LDI (o, 2) | |
123 | RCALL g(); | |
124 | ADD (acc, t) | |
125 | ||
126 | //voice 3: | |
127 | MOV (x, s) | |
128 | INC (x) | |
129 | #define tmp o | |
130 | MOV (tmp, x) | |
131 | LSR (tmp) | |
132 | LSR (tmp) | |
133 | ADD (tmp, x) | |
134 | ROR (tmp) | |
135 | LSR (tmp) | |
136 | ADD (tmp, x) | |
137 | ROR (tmp) | |
138 | LSR (tmp) | |
139 | ADD (tmp, x) | |
140 | ROR (tmp) | |
141 | LSR (tmp) | |
142 | MOV (x, tmp) | |
143 | #undef tmp | |
144 | MOV (Ml, i2) | |
145 | SWAP (Ml) | |
146 | ANDI (Ml, 0xf0) | |
147 | LSL (Ml) | |
148 | #define tmp Mh | |
149 | MOV (tmp, i1) | |
150 | LSR (tmp) | |
151 | LSR (tmp) | |
152 | LSR (tmp) | |
153 | OR (Ml, tmp) | |
154 | #undef tmp | |
155 | Mh = i3<<5 | i2>>3; | |
156 | RCALL mod3(); | |
157 | ADD (t, n) | |
158 | LDI (o, 2) | |
159 | RCALL g(); | |
160 | ADD (acc, t) | |
161 | ||
162 | //voice 4: | |
163 | MOV (x, s) | |
164 | INC (x) | |
165 | #define tmp o | |
166 | MOV (tmp, x) | |
167 | LSR (tmp) | |
168 | ADD (tmp, x) | |
169 | ROR (tmp) | |
170 | LSR (tmp) | |
171 | LSR (tmp) | |
172 | ADD (tmp, x) | |
173 | ROR (tmp) | |
174 | ADD (tmp, x) | |
175 | ROR (tmp) | |
176 | LSR (tmp) | |
177 | LSR (tmp) | |
178 | MOV (x, tmp) | |
179 | #undef tmp | |
180 | Ml = i2<<6 | i1>>2; | |
181 | Mh = i3<<6 | i2>>2; | |
182 | RCALL mod3(); | |
183 | SUB (t, n) | |
184 | NEG (t) | |
185 | SUBI (t, -8) | |
186 | LDI (o, 1) | |
187 | RCALL g(); | |
188 | ADD (acc, t) | |
189 | ||
190 | putchar(acc<<4); //TODO | |
191 | SUBI (i0, -1) | |
192 | ADC (i1, zero, !i0) | |
193 | ADC (i2, zero, !i0&&!i1) | |
194 | ADC (i3, zero, !i0&&!i1&&!i2) | |
195 | } | |
196 | } |