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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 | u8 loop; //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 mul(void) { //don't need overhead of function (inline it) | |
59 | // i1.i0 * t -> _.x.t | |
60 | #define a1 x | |
61 | #define a2 _ | |
62 | #define a0 t | |
63 | // start MUL -- 92 cycles :( (unrolled and skipping second bit: 76) | |
64 | CLR (a2) | |
65 | CLR (a1) | |
66 | ||
67 | #define MUL_ADD_ROR \ | |
68 | ADD (a1, i0) \ | |
69 | ADC (a2, i1, carry) \ | |
70 | MUL_ROR | |
71 | ||
72 | #define MUL_ROR \ | |
73 | LSR (a2) \ | |
74 | ROR (a1) | |
75 | ||
76 | switch(t) { | |
77 | case 0x58: // 0101 1000 | |
78 | MUL_ROR | |
79 | MUL_ROR | |
80 | MUL_ROR | |
81 | MUL_ADD_ROR | |
82 | ||
83 | MUL_ADD_ROR | |
84 | MUL_ROR | |
85 | MUL_ADD_ROR | |
86 | MUL_ROR | |
87 | break; | |
88 | case 0x69: // 0110 1001 | |
89 | MUL_ADD_ROR | |
90 | MUL_ROR | |
91 | MUL_ROR | |
92 | MUL_ADD_ROR | |
93 | ||
94 | MUL_ROR | |
95 | MUL_ADD_ROR | |
96 | MUL_ADD_ROR | |
97 | MUL_ROR | |
98 | break; | |
99 | case 0x75: // 0111 0101 | |
100 | MUL_ADD_ROR | |
101 | MUL_ROR | |
102 | MUL_ADD_ROR | |
103 | MUL_ROR | |
104 | ||
105 | MUL_ADD_ROR | |
106 | MUL_ADD_ROR | |
107 | MUL_ADD_ROR | |
108 | MUL_ROR | |
109 | break; | |
110 | case 0x84: // 1000 0100 | |
111 | MUL_ROR | |
112 | MUL_ROR | |
113 | MUL_ADD_ROR | |
114 | MUL_ROR | |
115 | ||
116 | MUL_ROR | |
117 | MUL_ROR | |
118 | MUL_ROR | |
119 | MUL_ADD_ROR | |
120 | break; | |
121 | case 0x8c: // 1000 1100 | |
122 | MUL_ROR | |
123 | MUL_ROR | |
124 | MUL_ADD_ROR | |
125 | MUL_ADD_ROR | |
126 | ||
127 | MUL_ROR | |
128 | MUL_ROR | |
129 | MUL_ROR | |
130 | MUL_ADD_ROR | |
131 | break; | |
132 | case 0x9d: // 1001 1101 | |
133 | MUL_ADD_ROR | |
134 | MUL_ROR | |
135 | MUL_ADD_ROR | |
136 | MUL_ADD_ROR | |
137 | ||
138 | MUL_ADD_ROR | |
139 | MUL_ROR | |
140 | MUL_ROR | |
141 | MUL_ADD_ROR | |
142 | break; | |
143 | case 0xb0: // 1011 0000 | |
144 | MUL_ROR | |
145 | MUL_ROR | |
146 | MUL_ROR | |
147 | MUL_ROR | |
148 | ||
149 | MUL_ADD_ROR | |
150 | MUL_ADD_ROR | |
151 | MUL_ROR | |
152 | MUL_ADD_ROR | |
153 | } | |
154 | ||
155 | // end MUL | |
156 | #undef a0 | |
157 | #undef a1 | |
158 | #undef a2 | |
159 | RET | |
160 | } | |
161 | void g(void) { | |
162 | // g(i, t) -> t | |
163 | // tempvars: `x` and `_` | |
164 | #define tmp _ | |
165 | ANDI (t, 0x07) | |
166 | MOV (tmp, i2) | |
167 | ANDI (tmp, 3) | |
168 | TST (tmp) | |
169 | #undef tmp | |
170 | BREQ (skip) | |
171 | SUBI (t, -8) | |
172 | skip: | |
173 | t = data[t]; | |
174 | /*MOV X_hi==x, data_hi | |
175 | MOV X_lo==t, data_lo | |
176 | ADD X_lo, t | |
177 | ADC X_hi, zero | |
178 | LD t, X */ | |
179 | RCALL mul(); //stores used value in in x | |
180 | MOV (t, x) | |
181 | RET //TODO: replace CALL/RET with IJMP? | |
182 | }; | |
183 | ||
184 | int main(void) { | |
185 | CLR (zero) | |
186 | CLR (i0) | |
187 | CLR (i1) | |
188 | CLR (i2) | |
189 | CLR (i3) | |
190 | for (;;) { | |
191 | MOV (n, i2) | |
192 | LSL (n) | |
193 | LSL (n) | |
194 | #define tmp _ | |
195 | MOV (tmp, i1) | |
196 | SWAP (tmp) | |
197 | ANDI (tmp, 0x0f) | |
198 | LSR (tmp) | |
199 | LSR (tmp) | |
200 | OR (n, tmp) | |
201 | #undef tmp | |
202 | MOV (s, i3) | |
203 | LSR (s) | |
204 | ROR (s) | |
205 | ANDI (s, 0x80) | |
206 | #define tmp _ | |
207 | MOV (tmp, i2) | |
208 | LSR (tmp) | |
209 | OR (s, tmp) | |
210 | #undef tmp | |
211 | ||
212 | //voice 1: | |
213 | MOV (t, n) | |
214 | RCALL g(); | |
215 | SWAP (t) | |
216 | ANDI (t, 1) | |
217 | MOV (acc, t) | |
218 | ||
219 | //voice 2: | |
220 | #define tmp _ | |
221 | MOV (tmp, i2) | |
222 | LSL (tmp) | |
223 | LSL (tmp) | |
224 | LSL (tmp) | |
225 | MOV (t, i1) | |
226 | SWAP (t) | |
227 | ANDI (t, 0xf) | |
228 | LSR (t) | |
229 | OR (t, tmp) | |
230 | #undef tmp | |
231 | EOR (t, n) | |
232 | RCALL g(); | |
233 | LSR (t) | |
234 | LSR (t) | |
235 | ANDI (t, 3) | |
236 | AND (t, s) | |
237 | ADD (acc, t) | |
238 | ||
239 | //voice 3: | |
240 | MOV (Ml, i2) | |
241 | SWAP (Ml) | |
242 | ANDI (Ml, 0xf0) | |
243 | LSL (Ml) | |
244 | #define tmp _ | |
245 | MOV (tmp, i1) | |
246 | LSR (tmp) | |
247 | LSR (tmp) | |
248 | LSR (tmp) | |
249 | OR (Ml, tmp) | |
250 | #undef tmp | |
251 | MOV (Mh, i3) | |
252 | SWAP (Mh) | |
253 | ANDI (Mh, 0xf0) | |
254 | LSL (Mh) | |
255 | #define tmp _ | |
256 | MOV (tmp, i2) | |
257 | LSR (tmp) | |
258 | LSR (tmp) | |
259 | LSR (tmp) | |
260 | OR (Mh, tmp) | |
261 | #undef tmp | |
262 | RCALL mod3(); | |
263 | ADD (t, n) | |
264 | RCALL g(); | |
265 | LSR (t) | |
266 | LSR (t) | |
267 | ANDI (t, 3) | |
268 | MOV (x, s) | |
269 | INC (x) | |
270 | #define tmp _ | |
271 | MOV (tmp, x) | |
272 | LSR (tmp) | |
273 | LSR (tmp) | |
274 | ADD (tmp, x) | |
275 | ROR (tmp) | |
276 | LSR (tmp) | |
277 | ADD (tmp, x) | |
278 | ROR (tmp) | |
279 | LSR (tmp) | |
280 | ADD (tmp, x) | |
281 | ROR (tmp) | |
282 | LSR (tmp) | |
283 | AND (t, tmp) | |
284 | #undef tmp | |
285 | ADD (acc, t) | |
286 | ||
287 | //voice 4: | |
288 | MOV (Ml, i2) | |
289 | SWAP (Ml) | |
290 | ANDI (Ml, 0xf0) | |
291 | LSL (Ml) | |
292 | LSL (Ml) | |
293 | #define tmp _ | |
294 | MOV (tmp, i1) | |
295 | LSR (tmp) | |
296 | LSR (tmp) | |
297 | OR (Ml, tmp) | |
298 | #undef tmp | |
299 | MOV (Mh, i3) | |
300 | SWAP (Mh) | |
301 | ANDI (Mh, 0xf0) | |
302 | LSL (Mh) | |
303 | LSL (Mh) | |
304 | #define tmp _ | |
305 | MOV (tmp, i2) | |
306 | LSR (tmp) | |
307 | LSR (tmp) | |
308 | OR (Mh, tmp) | |
309 | #undef tmp | |
310 | RCALL mod3(); | |
311 | SUB (t, n) | |
312 | NEG (t) | |
313 | SUBI (t, -8) | |
314 | RCALL g(); | |
315 | LSR (t) | |
316 | ANDI (t, 3) | |
317 | INC (s) | |
318 | #define tmp _ | |
319 | MOV (tmp, s) | |
320 | LSR (tmp) | |
321 | ADD (tmp, s) | |
322 | ROR (tmp) | |
323 | LSR (tmp) | |
324 | LSR (tmp) | |
325 | ADD (tmp, s) | |
326 | ROR (tmp) | |
327 | ADD (tmp, s) | |
328 | ROR (tmp) | |
329 | LSR (tmp) | |
330 | LSR (tmp) | |
331 | AND (t, tmp) | |
332 | #undef tmp | |
333 | ADD (acc, t) | |
334 | ||
335 | putchar(acc<<4); //TODO | |
336 | SUBI (i0, -1) | |
337 | ADC (i1, zero, !i0) | |
338 | ADC (i2, zero, !i0&&!i1) | |
339 | ADC (i3, zero, !i0&&!i1&&!i2) | |
340 | } | |
341 | } |