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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 | switch(t) { | |
68 | case 0x58: // 0101 1000 | |
69 | LSR (a2) | |
70 | ROR (a1) | |
71 | LSR (a2) | |
72 | ROR (a1) | |
73 | LSR (a2) | |
74 | ROR (a1) | |
75 | ADD (a1, i0) | |
76 | ADC (a2, i1, carry) | |
77 | LSR (a2) | |
78 | ROR (a1) | |
79 | ||
80 | ADD (a1, i0) | |
81 | ADC (a2, i1, carry) | |
82 | LSR (a2) | |
83 | ROR (a1) | |
84 | LSR (a2) | |
85 | ROR (a1) | |
86 | ADD (a1, i0) | |
87 | ADC (a2, i1, carry) | |
88 | LSR (a2) | |
89 | ROR (a1) | |
90 | LSR (a2) | |
91 | ROR (a1) | |
92 | break; | |
93 | case 0x69: // 0110 1001 | |
94 | ADD (a1, i0) | |
95 | ADC (a2, i1, carry) | |
96 | LSR (a2) | |
97 | ROR (a1) | |
98 | LSR (a2) | |
99 | ROR (a1) | |
100 | LSR (a2) | |
101 | ROR (a1) | |
102 | ADD (a1, i0) | |
103 | ADC (a2, i1, carry) | |
104 | LSR (a2) | |
105 | ROR (a1) | |
106 | ||
107 | LSR (a2) | |
108 | ROR (a1) | |
109 | ADD (a1, i0) | |
110 | ADC (a2, i1, carry) | |
111 | LSR (a2) | |
112 | ROR (a1) | |
113 | ADD (a1, i0) | |
114 | ADC (a2, i1, carry) | |
115 | LSR (a2) | |
116 | ROR (a1) | |
117 | LSR (a2) | |
118 | ROR (a1) | |
119 | break; | |
120 | case 0x75: // 0111 0101 | |
121 | ADD (a1, i0) | |
122 | ADC (a2, i1, carry) | |
123 | LSR (a2) | |
124 | ROR (a1) | |
125 | LSR (a2) | |
126 | ROR (a1) | |
127 | ADD (a1, i0) | |
128 | ADC (a2, i1, carry) | |
129 | LSR (a2) | |
130 | ROR (a1) | |
131 | LSR (a2) | |
132 | ROR (a1) | |
133 | ||
134 | ADD (a1, i0) | |
135 | ADC (a2, i1, carry) | |
136 | LSR (a2) | |
137 | ROR (a1) | |
138 | ADD (a1, i0) | |
139 | ADC (a2, i1, carry) | |
140 | LSR (a2) | |
141 | ROR (a1) | |
142 | ADD (a1, i0) | |
143 | ADC (a2, i1, carry) | |
144 | LSR (a2) | |
145 | ROR (a1) | |
146 | LSR (a2) | |
147 | ROR (a1) | |
148 | break; | |
149 | case 0x84: // 1000 0100 | |
150 | LSR (a2) | |
151 | ROR (a1) | |
152 | LSR (a2) | |
153 | ROR (a1) | |
154 | ADD (a1, i0) | |
155 | ADC (a2, i1, carry) | |
156 | LSR (a2) | |
157 | ROR (a1) | |
158 | LSR (a2) | |
159 | ROR (a1) | |
160 | ||
161 | LSR (a2) | |
162 | ROR (a1) | |
163 | LSR (a2) | |
164 | ROR (a1) | |
165 | LSR (a2) | |
166 | ROR (a1) | |
167 | ADD (a1, i0) | |
168 | ADC (a2, i1, carry) | |
169 | LSR (a2) | |
170 | ROR (a1) | |
171 | break; | |
172 | case 0x8c: // 1000 1100 | |
173 | LSR (a2) | |
174 | ROR (a1) | |
175 | LSR (a2) | |
176 | ROR (a1) | |
177 | ADD (a1, i0) | |
178 | ADC (a2, i1, carry) | |
179 | LSR (a2) | |
180 | ROR (a1) | |
181 | ADD (a1, i0) | |
182 | ADC (a2, i1, carry) | |
183 | LSR (a2) | |
184 | ROR (a1) | |
185 | ||
186 | LSR (a2) | |
187 | ROR (a1) | |
188 | LSR (a2) | |
189 | ROR (a1) | |
190 | LSR (a2) | |
191 | ROR (a1) | |
192 | ADD (a1, i0) | |
193 | ADC (a2, i1, carry) | |
194 | LSR (a2) | |
195 | ROR (a1) | |
196 | break; | |
197 | case 0x9d: // 1001 1101 | |
198 | ADD (a1, i0) | |
199 | ADC (a2, i1, carry) | |
200 | LSR (a2) | |
201 | ROR (a1) | |
202 | LSR (a2) | |
203 | ROR (a1) | |
204 | ADD (a1, i0) | |
205 | ADC (a2, i1, carry) | |
206 | LSR (a2) | |
207 | ROR (a1) | |
208 | ADD (a1, i0) | |
209 | ADC (a2, i1, carry) | |
210 | LSR (a2) | |
211 | ROR (a1) | |
212 | ||
213 | ADD (a1, i0) | |
214 | ADC (a2, i1, carry) | |
215 | LSR (a2) | |
216 | ROR (a1) | |
217 | LSR (a2) | |
218 | ROR (a1) | |
219 | LSR (a2) | |
220 | ROR (a1) | |
221 | ADD (a1, i0) | |
222 | ADC (a2, i1, carry) | |
223 | LSR (a2) | |
224 | ROR (a1) | |
225 | break; | |
226 | case 0xb0: // 1011 0000 | |
227 | LSR (a2) | |
228 | ROR (a1) | |
229 | LSR (a2) | |
230 | ROR (a1) | |
231 | LSR (a2) | |
232 | ROR (a1) | |
233 | LSR (a2) | |
234 | ROR (a1) | |
235 | ||
236 | ADD (a1, i0) | |
237 | ADC (a2, i1, carry) | |
238 | LSR (a2) | |
239 | ROR (a1) | |
240 | ADD (a1, i0) | |
241 | ADC (a2, i1, carry) | |
242 | LSR (a2) | |
243 | ROR (a1) | |
244 | LSR (a2) | |
245 | ROR (a1) | |
246 | ADD (a1, i0) | |
247 | ADC (a2, i1, carry) | |
248 | LSR (a2) | |
249 | ROR (a1) | |
250 | } | |
251 | ||
252 | // end MUL | |
253 | #undef a0 | |
254 | #undef a1 | |
255 | #undef a2 | |
256 | RET | |
257 | } | |
258 | void g(void) { | |
259 | // g(i, t) -> t | |
260 | // tempvars: `x` and `_` | |
261 | #define tmp _ | |
262 | ANDI (t, 0x07) | |
263 | MOV (tmp, i2) | |
264 | ANDI (tmp, 3) | |
265 | TST (tmp) | |
266 | #undef tmp | |
267 | BREQ (skip) | |
268 | SUBI (t, -8) | |
269 | skip: | |
270 | t = data[t]; | |
271 | /*MOV X_hi==x, data_hi | |
272 | MOV X_lo==t, data_lo | |
273 | ADD X_lo, t | |
274 | ADC X_hi, zero | |
275 | LD t, X */ | |
276 | RCALL mul(); //stores used value in in x | |
277 | MOV (t, x) | |
278 | RET //TODO: replace CALL/RET with IJMP? | |
279 | }; | |
280 | ||
281 | int main(void) { | |
282 | CLR (zero) | |
283 | CLR (i0) | |
284 | CLR (i1) | |
285 | CLR (i2) | |
286 | CLR (i3) | |
287 | for (;;) { | |
288 | MOV (n, i2) | |
289 | LSL (n) | |
290 | LSL (n) | |
291 | #define tmp _ | |
292 | MOV (tmp, i1) | |
293 | SWAP (tmp) | |
294 | ANDI (tmp, 0x0f) | |
295 | LSR (tmp) | |
296 | LSR (tmp) | |
297 | OR (n, tmp) | |
298 | #undef tmp | |
299 | MOV (s, i3) | |
300 | LSR (s) | |
301 | ROR (s) | |
302 | ANDI (s, 0x80) | |
303 | #define tmp _ | |
304 | MOV (tmp, i2) | |
305 | LSR (tmp) | |
306 | OR (s, tmp) | |
307 | #undef tmp | |
308 | ||
309 | //voice 1: | |
310 | MOV (t, n) | |
311 | RCALL g(); | |
312 | SWAP (t) | |
313 | ANDI (t, 1) | |
314 | MOV (acc, t) | |
315 | ||
316 | //voice 2: | |
317 | #define tmp _ | |
318 | MOV (tmp, i2) | |
319 | LSL (tmp) | |
320 | LSL (tmp) | |
321 | LSL (tmp) | |
322 | MOV (t, i1) | |
323 | SWAP (t) | |
324 | ANDI (t, 0xf) | |
325 | LSR (t) | |
326 | OR (t, tmp) | |
327 | #undef tmp | |
328 | EOR (t, n) | |
329 | RCALL g(); | |
330 | LSR (t) | |
331 | LSR (t) | |
332 | ANDI (t, 3) | |
333 | AND (t, s) | |
334 | ADD (acc, t) | |
335 | ||
336 | //voice 3: | |
337 | MOV (Ml, i2) | |
338 | SWAP (Ml) | |
339 | ANDI (Ml, 0xf0) | |
340 | LSL (Ml) | |
341 | #define tmp _ | |
342 | MOV (tmp, i1) | |
343 | LSR (tmp) | |
344 | LSR (tmp) | |
345 | LSR (tmp) | |
346 | OR (Ml, tmp) | |
347 | #undef tmp | |
348 | MOV (Mh, i3) | |
349 | SWAP (Mh) | |
350 | ANDI (Mh, 0xf0) | |
351 | LSL (Mh) | |
352 | #define tmp _ | |
353 | MOV (tmp, i2) | |
354 | LSR (tmp) | |
355 | LSR (tmp) | |
356 | LSR (tmp) | |
357 | OR (Mh, tmp) | |
358 | #undef tmp | |
359 | RCALL mod3(); | |
360 | ADD (t, n) | |
361 | RCALL g(); | |
362 | LSR (t) | |
363 | LSR (t) | |
364 | ANDI (t, 3) | |
365 | MOV (x, s) | |
366 | INC (x) | |
367 | #define tmp _ | |
368 | MOV (tmp, x) | |
369 | LSR (tmp) | |
370 | LSR (tmp) | |
371 | ADD (tmp, x) | |
372 | ROR (tmp) | |
373 | LSR (tmp) | |
374 | ADD (tmp, x) | |
375 | ROR (tmp) | |
376 | LSR (tmp) | |
377 | ADD (tmp, x) | |
378 | ROR (tmp) | |
379 | LSR (tmp) | |
380 | AND (t, tmp) | |
381 | #undef tmp | |
382 | ADD (acc, t) | |
383 | ||
384 | //voice 4: | |
385 | MOV (Ml, i2) | |
386 | SWAP (Ml) | |
387 | ANDI (Ml, 0xf0) | |
388 | LSL (Ml) | |
389 | LSL (Ml) | |
390 | #define tmp _ | |
391 | MOV (tmp, i1) | |
392 | LSR (tmp) | |
393 | LSR (tmp) | |
394 | OR (Ml, tmp) | |
395 | #undef tmp | |
396 | MOV (Mh, i3) | |
397 | SWAP (Mh) | |
398 | ANDI (Mh, 0xf0) | |
399 | LSL (Mh) | |
400 | LSL (Mh) | |
401 | #define tmp _ | |
402 | MOV (tmp, i2) | |
403 | LSR (tmp) | |
404 | LSR (tmp) | |
405 | OR (Mh, tmp) | |
406 | #undef tmp | |
407 | RCALL mod3(); | |
408 | SUB (t, n) | |
409 | NEG (t) | |
410 | SUBI (t, -8) | |
411 | RCALL g(); | |
412 | LSR (t) | |
413 | ANDI (t, 3) | |
414 | INC (s) | |
415 | #define tmp _ | |
416 | MOV (tmp, s) | |
417 | LSR (tmp) | |
418 | ADD (tmp, s) | |
419 | ROR (tmp) | |
420 | LSR (tmp) | |
421 | LSR (tmp) | |
422 | ADD (tmp, s) | |
423 | ROR (tmp) | |
424 | ADD (tmp, s) | |
425 | ROR (tmp) | |
426 | LSR (tmp) | |
427 | LSR (tmp) | |
428 | AND (t, tmp) | |
429 | #undef tmp | |
430 | ADD (acc, t) | |
431 | ||
432 | putchar(acc<<4); //TODO | |
433 | SUBI (i0, -1) | |
434 | ADC (i1, zero, !i0) | |
435 | ADC (i2, zero, !i0&&!i1) | |
436 | ADC (i3, zero, !i0&&!i1&&!i2) | |
437 | } | |
438 | } |