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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 | ANDI (Ml, 0x0f) | |
32 | ADD (Ml, tmp) //discard tmp | |
33 | MOV (tmp, Ml) | |
34 | LSR (tmp) | |
35 | LSR (tmp) | |
36 | ANDI (Ml, 0x03) | |
37 | Ml = (tmp) + (Ml); | |
38 | Ml = (Ml >> 2) + (Ml & 0x3); | |
39 | if (Ml > 2) Ml = Ml - 3; | |
40 | #undef tmp | |
41 | } | |
42 | void g(void) { | |
43 | // g(i, x, t, o) -> t | |
44 | #define tmp _ | |
45 | ANDI (t, 0x07) | |
46 | MOV (tmp, i2) | |
47 | ANDI (tmp, 3) | |
48 | TST (tmp) | |
49 | #undef tmp | |
50 | BREQ (skip) | |
51 | SUBI (t, -8) | |
52 | skip: | |
53 | t = data[t]; | |
54 | /*MOV X_hi==_, data_hi | |
55 | MOV X_lo==t, data_lo | |
56 | ADD X_lo, t | |
57 | ADC X_hi, zero | |
58 | LD t, X */ | |
59 | t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO | |
60 | t >>= o; //NOTE: o == {1, 2, 4} | |
61 | AND (t, x) | |
62 | ANDI (t, 3) | |
63 | RET | |
64 | }; | |
65 | ||
66 | int main(void) { | |
67 | u8 n; | |
68 | u8 s; | |
69 | u8 acc; | |
70 | //TODO: clear all vars/registers | |
71 | for (;;) { | |
72 | MOV (n, i2) | |
73 | LSL (n) | |
74 | LSL (n) | |
75 | #define tmp acc | |
76 | MOV (tmp, i1) | |
77 | SWAP (tmp) | |
78 | ANDI (tmp, 0x0f) | |
79 | LSR (tmp) | |
80 | LSR (tmp) | |
81 | OR (n, tmp) | |
82 | #undef tmp | |
83 | MOV (s, i3) | |
84 | ROR (s) | |
85 | ROR (s) | |
86 | ANDI (s, 0x80) | |
87 | #define tmp acc | |
88 | MOV (tmp, i2) | |
89 | LSR (tmp) | |
90 | OR (s, tmp) | |
91 | #undef tmp | |
92 | ||
93 | //voice 1: | |
94 | LDI (x, 1) | |
95 | MOV (t, n) | |
96 | LDI (o, 4) | |
97 | RCALL g(); | |
98 | MOV (acc, t) | |
99 | ||
100 | //voice 2: | |
101 | MOV (x, s) | |
102 | #define tmp o | |
103 | MOV (tmp, i2) | |
104 | LSL (tmp) | |
105 | LSL (tmp) | |
106 | LSL (tmp) | |
107 | MOV (t, i1) | |
108 | SWAP (t) | |
109 | ANDI (t, 0xf) | |
110 | LSR (t) | |
111 | OR (t, tmp) | |
112 | #undef tmp | |
113 | EOR (t, n) | |
114 | LDI (o, 2) | |
115 | RCALL g(); | |
116 | ADD (acc, t) | |
117 | ||
118 | //voice 3: | |
119 | MOV (x, s) | |
120 | INC (x) | |
121 | #define tmp o | |
122 | MOV (tmp, x) | |
123 | LSR (tmp) | |
124 | LSR (tmp) | |
125 | ADD (tmp, x) | |
126 | ROR (tmp) | |
127 | LSR (tmp) | |
128 | ADD (tmp, x) | |
129 | ROR (tmp) | |
130 | LSR (tmp) | |
131 | ADD (tmp, x) | |
132 | ROR (tmp) | |
133 | LSR (tmp) | |
134 | MOV (x, tmp) | |
135 | #undef tmp | |
136 | Ml = i2<<5 | i1>>3; | |
137 | Mh = i3<<5 | i2>>3; | |
138 | RCALL mod3(); | |
139 | ADD (t, n) | |
140 | LDI (o, 2) | |
141 | RCALL g(); | |
142 | ADD (acc, t) | |
143 | ||
144 | //voice 4: | |
145 | MOV (x, s) | |
146 | INC (x) | |
147 | #define tmp o | |
148 | MOV (tmp, x) | |
149 | LSR (tmp) | |
150 | ADD (tmp, x) | |
151 | ROR (tmp) | |
152 | LSR (tmp) | |
153 | LSR (tmp) | |
154 | ADD (tmp, x) | |
155 | ROR (tmp) | |
156 | ADD (tmp, x) | |
157 | ROR (tmp) | |
158 | LSR (tmp) | |
159 | LSR (tmp) | |
160 | MOV (x, tmp) | |
161 | #undef tmp | |
162 | Ml = i2<<6 | i1>>2; | |
163 | Mh = i3<<6 | i2>>2; | |
164 | RCALL mod3(); | |
165 | SUB (t, n) | |
166 | NEG (t) | |
167 | SUBI (t, -8) | |
168 | LDI (o, 1) | |
169 | RCALL g(); | |
170 | ADD (acc, t) | |
171 | ||
172 | putchar(acc<<4); //TODO | |
173 | SUBI (i0, -1) | |
174 | ADC (i1, zero, !i0) | |
175 | ADC (i2, zero, !i0&&!i1) | |
176 | ADC (i3, zero, !i0&&!i1&&!i2) | |
177 | } | |
178 | } |