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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 _ // -"- | |
20 | #define Mr t // -"- | |
21 | u8 mod3(u8 hi, u8 lo) { //avail: t, o _ | |
22 | //http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml | |
23 | unsigned short a = ((hi) + (lo)) &0x1ff; | |
24 | hi = a>>8; //1 bit | |
25 | lo = a; | |
26 | lo = (hi<<4|lo>>4) + (lo & 0xF); | |
27 | lo = (lo >> 2) + (lo & 0x3); | |
28 | lo = (lo >> 2) + (lo & 0x3); | |
29 | if (lo > 2) lo = lo - 3; | |
30 | return lo; | |
31 | } | |
32 | void g(void) { | |
33 | // g(i, x, t, o) -> t | |
34 | #define tmp _ | |
35 | ANDI (t, 0x07) | |
36 | MOV (tmp, i2) | |
37 | ANDI (tmp, 3) | |
38 | TST (tmp) | |
39 | #undef tmp | |
40 | BREQ (skip) | |
41 | SUBI (t, -8) | |
42 | skip: | |
43 | t = data[t]; | |
44 | /*MOV X_hi==_, data_hi | |
45 | MOV X_lo==t, data_lo | |
46 | ADD X_lo, t | |
47 | ADC X_hi, zero | |
48 | LD t, X */ | |
49 | t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO | |
50 | t >>= o; //NOTE: o == {1, 2, 4} | |
51 | AND (t, x) | |
52 | ANDI (t, 3) | |
53 | RET | |
54 | }; | |
55 | ||
56 | int main(void) { | |
57 | u8 n; | |
58 | u8 s; | |
59 | u8 acc; | |
60 | //TODO: clear all vars/registers | |
61 | for (;;) { | |
62 | MOV (n, i2) | |
63 | LSL (n) | |
64 | LSL (n) | |
65 | #define tmp acc | |
66 | MOV (tmp, i1) | |
67 | SWAP (tmp) | |
68 | ANDI (tmp, 0x0f) | |
69 | LSR (tmp) | |
70 | LSR (tmp) | |
71 | OR (n, tmp) | |
72 | #undef tmp | |
73 | MOV (s, i3) | |
74 | ROR (s) | |
75 | ROR (s) | |
76 | ANDI (s, 0x80) | |
77 | #define tmp acc | |
78 | MOV (tmp, i2) | |
79 | LSR (tmp) | |
80 | OR (s, tmp) | |
81 | #undef tmp | |
82 | ||
83 | //voice 1: | |
84 | LDI (x, 1) | |
85 | MOV (t, n) | |
86 | LDI (o, 4) | |
87 | RCALL g(); | |
88 | MOV (acc, t) | |
89 | ||
90 | //voice 2: | |
91 | MOV (x, s) | |
92 | #define tmp o | |
93 | MOV (tmp, i2) | |
94 | LSL (tmp) | |
95 | LSL (tmp) | |
96 | LSL (tmp) | |
97 | MOV (t, i1) | |
98 | SWAP (t) | |
99 | ANDI (t, 0xf) | |
100 | LSR (t) | |
101 | OR (t, tmp) | |
102 | #undef tmp | |
103 | EOR (t, n) | |
104 | LDI (o, 2) | |
105 | RCALL g(); | |
106 | ADD (acc, t) | |
107 | ||
108 | //voice 3: | |
109 | MOV (x, s) | |
110 | INC (x) | |
111 | #define tmp o | |
112 | MOV (tmp, x) | |
113 | LSR (tmp) | |
114 | LSR (tmp) | |
115 | ADD (tmp, x) | |
116 | ROR (tmp) | |
117 | LSR (tmp) | |
118 | ADD (tmp, x) | |
119 | ROR (tmp) | |
120 | LSR (tmp) | |
121 | ADD (tmp, x) | |
122 | ROR (tmp) | |
123 | LSR (tmp) | |
124 | MOV (x, tmp) | |
125 | #undef tmp | |
126 | Ml = i2<<5 | i1>>3; | |
127 | Mh = i3<<5 | i2>>3; | |
128 | t = mod3(Mh,Ml); //TODO | |
129 | ADD (t, n) | |
130 | LDI (o, 2) | |
131 | RCALL g(); | |
132 | ADD (acc, t) | |
133 | ||
134 | //voice 4: | |
135 | MOV (x, s) | |
136 | INC (x) | |
137 | #define tmp o | |
138 | MOV (tmp, x) | |
139 | LSR (tmp) | |
140 | ADD (tmp, x) | |
141 | ROR (tmp) | |
142 | LSR (tmp) | |
143 | LSR (tmp) | |
144 | ADD (tmp, x) | |
145 | ROR (tmp) | |
146 | ADD (tmp, x) | |
147 | ROR (tmp) | |
148 | LSR (tmp) | |
149 | LSR (tmp) | |
150 | MOV (x, tmp) | |
151 | #undef tmp | |
152 | Ml = i2<<6 | i1>>2; | |
153 | Mh = i3<<6 | i2>>2; | |
154 | t = mod3(Mh,Ml); //TODO | |
155 | SUB (t, n) | |
156 | NEG (t) | |
157 | SUBI (t, -8) | |
158 | LDI (o, 1) | |
159 | RCALL g(); | |
160 | ADD (acc, t) | |
161 | ||
162 | putchar(acc<<4); //TODO | |
163 | SUBI (i0, -1) | |
164 | ADC (i1, zero, !i0) | |
165 | ADC (i2, zero, !i0&&!i1) | |
166 | ADC (i3, zero, !i0&&!i1&&!i2) | |
167 | } | |
168 | } |