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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; //r16 | |
10 | u8 acc; //r17 | |
11 | u8 i0; //r18 | |
12 | u8 i1; //r19 | |
13 | u8 i2; //r20 | |
14 | u8 i3; //r21 | |
15 | u8 n; //r22 | |
16 | u8 s; //r23 | |
17 | u8 _; //r24 | |
18 | //r25 | |
19 | u8 t;/*==Ml*/ //r26 (Xlo) | |
20 | u8 x;/*==Mh*/ //r27 (Xhi) | |
21 | //r28 | |
22 | //r29 | |
23 | /*fakestack_l*/ //r30 (Zlo) | |
24 | /*fakestack_h*/ //r31 (Zhi) | |
25 | #define Mh x //mod3 vars | |
26 | #define Ml t // -"- | |
27 | //http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml | |
28 | void mod3(void) { | |
29 | // mod3(Mh.Ml) -> t | |
30 | #define tmp _ | |
31 | ADD (Ml, Mh) | |
32 | CLR (Mh) | |
33 | ADC (Mh, zero, carry) //Mh only holds the carry bit | |
34 | MOV (tmp, Ml) | |
35 | SWAP (tmp) | |
36 | ANDI (tmp, 0x0f) | |
37 | SWAP (Mh) | |
38 | OR (tmp, Mh) | |
39 | ANDI (Ml, 0x0f) | |
40 | ADD (Ml, tmp) | |
41 | MOV (tmp, Ml) | |
42 | LSR (tmp) | |
43 | LSR (tmp) | |
44 | ANDI (Ml, 0x03) | |
45 | ADD (Ml, tmp) | |
46 | MOV (tmp, Ml) | |
47 | LSR (tmp) | |
48 | LSR (tmp) | |
49 | ANDI (Ml, 0x03) | |
50 | ADD (Ml, tmp) | |
51 | CPI (Ml, 3) | |
52 | BRPL (skip) | |
53 | SUBI (Ml, 3) | |
54 | skip:; | |
55 | RET | |
56 | #undef tmp | |
57 | } | |
58 | void g(void) { | |
59 | // g(i, t) -> t | |
60 | // tempvars: `x` and `_` | |
61 | #define tmp _ | |
62 | ANDI (t, 0x07) | |
63 | MOV (tmp, i2) | |
64 | ANDI (tmp, 3) | |
65 | TST (tmp) | |
66 | #undef tmp | |
67 | BREQ (skip) | |
68 | SUBI (t, -8) | |
69 | skip: | |
70 | t = data[t]; | |
71 | /*MOV X_hi==x, data_hi | |
72 | MOV X_lo==t, data_lo | |
73 | ADD X_lo, t | |
74 | ADC X_hi, zero | |
75 | LD t, X */ | |
76 | //t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO | |
77 | ||
78 | #define a1 x | |
79 | #define a2 _ | |
80 | a2 = 0; | |
81 | a1 = 0; | |
82 | #define a0 t | |
83 | ||
84 | for (u8 loop = 0; loop < 8; loop++) { //Note: t&2 always zero | |
85 | if (t & 1) { | |
86 | ADD (a1, i0) | |
87 | ADC (a2, i1, carry) | |
88 | } | |
89 | LSR (a2) | |
90 | ROR (a1) | |
91 | ROR (t) | |
92 | } | |
93 | t = a1; | |
94 | #undef a0 | |
95 | ||
96 | t &= 0x1e; //hint -- TODO: breaks without!? | |
97 | RET //TODO: replace CALL/RET with IJMP? | |
98 | }; | |
99 | ||
100 | int main(void) { | |
101 | CLR (zero) | |
102 | CLR (i0) | |
103 | CLR (i1) | |
104 | CLR (i2) | |
105 | CLR (i3) | |
106 | for (;;) { | |
107 | MOV (n, i2) | |
108 | LSL (n) | |
109 | LSL (n) | |
110 | #define tmp _ | |
111 | MOV (tmp, i1) | |
112 | SWAP (tmp) | |
113 | ANDI (tmp, 0x0f) | |
114 | LSR (tmp) | |
115 | LSR (tmp) | |
116 | OR (n, tmp) | |
117 | #undef tmp | |
118 | MOV (s, i3) | |
119 | LSR (s) | |
120 | ROR (s) | |
121 | ANDI (s, 0x80) | |
122 | #define tmp _ | |
123 | MOV (tmp, i2) | |
124 | LSR (tmp) | |
125 | OR (s, tmp) | |
126 | #undef tmp | |
127 | ||
128 | //voice 1: | |
129 | MOV (t, n) | |
130 | RCALL g(); | |
131 | SWAP (t) | |
132 | MOV (acc, t) | |
133 | ||
134 | //voice 2: | |
135 | #define tmp _ | |
136 | MOV (tmp, i2) | |
137 | LSL (tmp) | |
138 | LSL (tmp) | |
139 | LSL (tmp) | |
140 | MOV (t, i1) | |
141 | SWAP (t) | |
142 | ANDI (t, 0xf) | |
143 | LSR (t) | |
144 | OR (t, tmp) | |
145 | #undef tmp | |
146 | EOR (t, n) | |
147 | RCALL g(); | |
148 | LSR (t) | |
149 | LSR (t) | |
150 | ANDI (t, 3) | |
151 | AND (t, s) | |
152 | ADD (acc, t) | |
153 | ||
154 | //voice 3: | |
155 | MOV (Ml, i2) | |
156 | SWAP (Ml) | |
157 | ANDI (Ml, 0xf0) | |
158 | LSL (Ml) | |
159 | #define tmp _ | |
160 | MOV (tmp, i1) | |
161 | LSR (tmp) | |
162 | LSR (tmp) | |
163 | LSR (tmp) | |
164 | OR (Ml, tmp) | |
165 | #undef tmp | |
166 | MOV (Mh, i3) | |
167 | SWAP (Mh) | |
168 | ANDI (Mh, 0xf0) | |
169 | LSL (Mh) | |
170 | #define tmp _ | |
171 | MOV (tmp, i2) | |
172 | LSR (tmp) | |
173 | LSR (tmp) | |
174 | LSR (tmp) | |
175 | OR (Mh, tmp) | |
176 | #undef tmp | |
177 | RCALL mod3(); | |
178 | ADD (t, n) | |
179 | RCALL g(); | |
180 | LSR (t) | |
181 | LSR (t) | |
182 | ANDI (t, 3) | |
183 | MOV (x, s) | |
184 | INC (x) | |
185 | #define tmp _ | |
186 | MOV (tmp, x) | |
187 | LSR (tmp) | |
188 | LSR (tmp) | |
189 | ADD (tmp, x) | |
190 | ROR (tmp) | |
191 | LSR (tmp) | |
192 | ADD (tmp, x) | |
193 | ROR (tmp) | |
194 | LSR (tmp) | |
195 | ADD (tmp, x) | |
196 | ROR (tmp) | |
197 | LSR (tmp) | |
198 | AND (t, tmp) | |
199 | #undef tmp | |
200 | ADD (acc, t) | |
201 | ||
202 | //voice 4: | |
203 | MOV (Ml, i2) | |
204 | SWAP (Ml) | |
205 | ANDI (Ml, 0xf0) | |
206 | LSL (Ml) | |
207 | LSL (Ml) | |
208 | #define tmp _ | |
209 | MOV (tmp, i1) | |
210 | LSR (tmp) | |
211 | LSR (tmp) | |
212 | OR (Ml, tmp) | |
213 | #undef tmp | |
214 | MOV (Mh, i3) | |
215 | SWAP (Mh) | |
216 | ANDI (Mh, 0xf0) | |
217 | LSL (Mh) | |
218 | LSL (Mh) | |
219 | #define tmp _ | |
220 | MOV (tmp, i2) | |
221 | LSR (tmp) | |
222 | LSR (tmp) | |
223 | OR (Mh, tmp) | |
224 | #undef tmp | |
225 | RCALL mod3(); | |
226 | SUB (t, n) | |
227 | NEG (t) | |
228 | SUBI (t, -8) | |
229 | RCALL g(); | |
230 | LSR (t) | |
231 | ANDI (t, 3) | |
232 | INC (s) | |
233 | #define tmp _ | |
234 | MOV (tmp, s) | |
235 | LSR (tmp) | |
236 | ADD (tmp, s) | |
237 | ROR (tmp) | |
238 | LSR (tmp) | |
239 | LSR (tmp) | |
240 | ADD (tmp, s) | |
241 | ROR (tmp) | |
242 | ADD (tmp, s) | |
243 | ROR (tmp) | |
244 | LSR (tmp) | |
245 | LSR (tmp) | |
246 | AND (t, tmp) | |
247 | #undef tmp | |
248 | ADD (acc, t) | |
249 | ||
250 | putchar(acc<<4); //TODO | |
251 | SUBI (i0, -1) | |
252 | ADC (i1, zero, !i0) | |
253 | ADC (i2, zero, !i0&&!i1) | |
254 | ADC (i3, zero, !i0&&!i1&&!i2) | |
255 | } | |
256 | } |