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[Chiptunes.git] / foo.c
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61fab018 1#include <stdio.h>
da32ed67 2#include "fakeasm.h"
61fab018 3typedef unsigned char u8;
da32ed67 4
24abdcbb
TG		 5u8 data[] = {
6 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
7 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
8};
61592bdd
TG		 9u8 zero; //r16
10u8 acc; //r17
11u8 i0; //r18
12u8 i1; //r19
13u8 i2; //r20
14u8 i3; //r21
15u8 n; //r22
16u8 s; //r23
17u8 _; //r24
181efc5e 18u8 loop; //r25
61592bdd
TG		 19u8 t;/*==Ml*/ //r26 (Xlo)
20u8 x;/*==Mh*/ //r27 (Xhi)
21 //r28
22 //r29
23/*fakestack_l*/ //r30 (Zlo)
24/*fakestack_h*/ //r31 (Zhi)
37bf20ea 25#define Mh x //mod3 vars
dbf91c38 26#define Ml t // -"-
e98ab46f 27//http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml
8d8c00e4
TG		 28void mod3(void) {
29 // mod3(Mh.Ml) -> t
30 #define tmp _
5b1c6cc5
TG		 31 ADD (Ml, Mh)
32 CLR (Mh)
3d517d8a
TG		 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)
0e3d0279 39 ANDI (Ml, 0x0f)
2a69999d 40 ADD (Ml, tmp)
0fc1d6d3
TG		 41 MOV (tmp, Ml)
42 LSR (tmp)
43 LSR (tmp)
6c72d3c1 44 ANDI (Ml, 0x03)
2a69999d
TG		 45 ADD (Ml, tmp)
46 MOV (tmp, Ml)
47 LSR (tmp)
48 LSR (tmp)
49 ANDI (Ml, 0x03)
50 ADD (Ml, tmp)
c3639d5b
TG		 51 CPI (Ml, 3)
52 BRPL (skip)
197a5418 53 SUBI (Ml, 3)
c3639d5b 54 skip:;
4283632d 55 RET
8d8c00e4 56 #undef tmp
e98ab46f 57}
d0324785
TG		 58void 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
44e34da0
TG		 67 CPI (t, 0x58)
68 BREQ (mul_58)
69 CPI (t, 0x69)
70 BREQ (mul_69)
71 CPI (t, 0x75)
72 BREQ (mul_75)
73 CPI (t, 0x84)
74 BREQ (mul_84)
75 CPI (t, 0x8c)
76 BREQ (mul_8c)
77 CPI (t, 0x9d)
78 BREQ (mul_9d)
79 CPI (t, 0xb0)
80 BREQ (mul_b0)
81 mul_58: // 0101 1000
30966f17
TG		 82 LSR (a2)
83 ROR (a1)
84 LSR (a2)
85 ROR (a1)
86 LSR (a2)
87 ROR (a1)
88 ADD (a1, i0)
89 ADC (a2, i1, carry)
90 LSR (a2)
91 ROR (a1)
d0324785 92
30966f17
TG		 93 ADD (a1, i0)
94 ADC (a2, i1, carry)
95 LSR (a2)
96 ROR (a1)
97 LSR (a2)
98 ROR (a1)
99 ADD (a1, i0)
100 ADC (a2, i1, carry)
101 LSR (a2)
102 ROR (a1)
103 LSR (a2)
104 ROR (a1)
44e34da0
TG		 105 RJMP (endmul)
106 mul_69: // 0110 1001
30966f17
TG		 107 ADD (a1, i0)
108 ADC (a2, i1, carry)
109 LSR (a2)
110 ROR (a1)
111 LSR (a2)
112 ROR (a1)
113 LSR (a2)
114 ROR (a1)
115 ADD (a1, i0)
116 ADC (a2, i1, carry)
117 LSR (a2)
118 ROR (a1)
d0324785 119
30966f17
TG		 120 LSR (a2)
121 ROR (a1)
122 ADD (a1, i0)
123 ADC (a2, i1, carry)
124 LSR (a2)
125 ROR (a1)
126 ADD (a1, i0)
127 ADC (a2, i1, carry)
128 LSR (a2)
129 ROR (a1)
130 LSR (a2)
131 ROR (a1)
44e34da0
TG		 132 RJMP (endmul)
133 mul_75: // 0111 0101
30966f17
TG		 134 ADD (a1, i0)
135 ADC (a2, i1, carry)
136 LSR (a2)
137 ROR (a1)
138 LSR (a2)
139 ROR (a1)
140 ADD (a1, i0)
141 ADC (a2, i1, carry)
142 LSR (a2)
143 ROR (a1)
144 LSR (a2)
145 ROR (a1)
d0324785 146
30966f17
TG		 147 ADD (a1, i0)
148 ADC (a2, i1, carry)
149 LSR (a2)
150 ROR (a1)
151 ADD (a1, i0)
152 ADC (a2, i1, carry)
153 LSR (a2)
154 ROR (a1)
155 ADD (a1, i0)
156 ADC (a2, i1, carry)
157 LSR (a2)
158 ROR (a1)
159 LSR (a2)
160 ROR (a1)
44e34da0
TG		 161 RJMP (endmul)
162 mul_84: // 1000 0100
30966f17
TG		 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 LSR (a2)
172 ROR (a1)
d0324785 173
30966f17
TG		 174 LSR (a2)
175 ROR (a1)
176 LSR (a2)
177 ROR (a1)
178 LSR (a2)
179 ROR (a1)
180 ADD (a1, i0)
181 ADC (a2, i1, carry)
182 LSR (a2)
183 ROR (a1)
44e34da0
TG		 184 RJMP (endmul)
185 mul_8c: // 1000 1100
30966f17
TG		 186 LSR (a2)
187 ROR (a1)
188 LSR (a2)
189 ROR (a1)
190 ADD (a1, i0)
191 ADC (a2, i1, carry)
192 LSR (a2)
193 ROR (a1)
194 ADD (a1, i0)
195 ADC (a2, i1, carry)
196 LSR (a2)
197 ROR (a1)
d0324785 198
30966f17
TG		 199 LSR (a2)
200 ROR (a1)
201 LSR (a2)
202 ROR (a1)
203 LSR (a2)
204 ROR (a1)
205 ADD (a1, i0)
206 ADC (a2, i1, carry)
207 LSR (a2)
208 ROR (a1)
44e34da0
TG		 209 RJMP (endmul)
210 mul_9d: // 1001 1101
30966f17
TG		 211 ADD (a1, i0)
212 ADC (a2, i1, carry)
213 LSR (a2)
214 ROR (a1)
215 LSR (a2)
216 ROR (a1)
217 ADD (a1, i0)
218 ADC (a2, i1, carry)
219 LSR (a2)
220 ROR (a1)
221 ADD (a1, i0)
222 ADC (a2, i1, carry)
223 LSR (a2)
224 ROR (a1)
d0324785 225
30966f17
TG		 226 ADD (a1, i0)
227 ADC (a2, i1, carry)
228 LSR (a2)
229 ROR (a1)
230 LSR (a2)
231 ROR (a1)
232 LSR (a2)
233 ROR (a1)
234 ADD (a1, i0)
235 ADC (a2, i1, carry)
236 LSR (a2)
237 ROR (a1)
44e34da0
TG		 238 RJMP (endmul)
239 mul_b0: // 1011 0000
30966f17
TG		 240 LSR (a2)
241 ROR (a1)
242 LSR (a2)
243 ROR (a1)
244 LSR (a2)
245 ROR (a1)
246 LSR (a2)
247 ROR (a1)
d0324785 248
30966f17
TG		 249 ADD (a1, i0)
250 ADC (a2, i1, carry)
251 LSR (a2)
252 ROR (a1)
253 ADD (a1, i0)
254 ADC (a2, i1, carry)
255 LSR (a2)
256 ROR (a1)
257 LSR (a2)
258 ROR (a1)
259 ADD (a1, i0)
260 ADC (a2, i1, carry)
261 LSR (a2)
262 ROR (a1)
44e34da0 263 endmul:
d0324785
TG		 264
265 // end MUL
266 #undef a0
267 #undef a1
268 #undef a2
269 RET
270}
965274e2 271void g(void) {
362b33c9 272 // g(i, t) -> t
eafeaf93 273 // tempvars: `x` and `_`
49137fbf 274 #define tmp _
0f219114 275 ANDI (t, 0x07)
32632e61 276 MOV (tmp, i2)
63363195 277 ANDI (tmp, 3)
09cf3949 278 TST (tmp)
49137fbf 279 #undef tmp
09cf3949
TG		 280 BREQ (skip)
281 SUBI (t, -8)
282 skip:
c616f0c2 283 t = data[t];
8ee3310e 284 /*MOV X_hi==x, data_hi
49137fbf
TG		 285 MOV X_lo==t, data_lo
286 ADD X_lo, t
49137fbf
TG		 287 ADC X_hi, zero
288 LD t, X */
d0324785
TG		 289 RCALL mul(); //stores used value in in x
290 MOV (t, x)
d5b74a12 291 RET //TODO: replace CALL/RET with IJMP?
61fab018
TG		 292};
293
294int main(void) {
23e66ca4
TG		 295 CLR (zero)
296 CLR (i0)
297 CLR (i1)
298 CLR (i2)
299 CLR (i3)
5dd8b8ff 300 for (;;) {
7874ed03
TG		 301 MOV (n, i2)
302 LSL (n)
303 LSL (n)
8ee3310e 304 #define tmp _
bc7680e3 305 MOV (tmp, i1)
5d4207f9
TG		 306 SWAP (tmp)
307 ANDI (tmp, 0x0f)
3eef1ade
TG		 308 LSR (tmp)
309 LSR (tmp)
128ff01a 310 OR (n, tmp)
bc7680e3 311 #undef tmp
df192822 312 MOV (s, i3)
2bbe001f 313 LSR (s)
27b03017
TG		 314 ROR (s)
315 ANDI (s, 0x80)
8ee3310e 316 #define tmp _
a582bbc3
TG		 317 MOV (tmp, i2)
318 LSR (tmp)
e389879f 319 OR (s, tmp)
df192822 320 #undef tmp
3b86ca43
TG		 321
322 //voice 1:
3b86ca43 323 MOV (t, n)
965274e2 324 RCALL g();
c09a6ed8 325 SWAP (t)
9e62fea4 326 ANDI (t, 1)
46a8d83c 327 MOV (acc, t)
3b86ca43
TG		 328
329 //voice 2:
37bf20ea 330 #define tmp _
94c4920f
TG		 331 MOV (tmp, i2)
332 LSL (tmp)
333 LSL (tmp)
334 LSL (tmp)
335 MOV (t, i1)
4b0b7dc5
TG		 336 SWAP (t)
337 ANDI (t, 0xf)
338 LSR (t)
94c4920f 339 OR (t, tmp)
1b023e92 340 #undef tmp
23872091 341 EOR (t, n)
965274e2 342 RCALL g();
7716b427
TG		 343 LSR (t)
344 LSR (t)
345 ANDI (t, 3)
f28def6a 346 AND (t, s)
46a8d83c 347 ADD (acc, t)
3b86ca43
TG		 348
349 //voice 3:
500692e4
TG		 350 MOV (Ml, i2)
351 SWAP (Ml)
352 ANDI (Ml, 0xf0)
353 LSL (Ml)
8ee3310e 354 #define tmp _
500692e4
TG		 355 MOV (tmp, i1)
356 LSR (tmp)
357 LSR (tmp)
358 LSR (tmp)
359 OR (Ml, tmp)
360 #undef tmp
d39a46f5
TG		 361 MOV (Mh, i3)
362 SWAP (Mh)
363 ANDI (Mh, 0xf0)
364 LSL (Mh)
365 #define tmp _
366 MOV (tmp, i2)
367 LSR (tmp)
368 LSR (tmp)
369 LSR (tmp)
370 OR (Mh, tmp)
371 #undef tmp
dbf91c38 372 RCALL mod3();
18570947 373 ADD (t, n)
965274e2 374 RCALL g();
c6c6cbe5
TG		 375 LSR (t)
376 LSR (t)
377 ANDI (t, 3)
f28def6a
TG		 378 MOV (x, s)
379 INC (x)
37bf20ea 380 #define tmp _
f28def6a
TG		 381 MOV (tmp, x)
382 LSR (tmp)
383 LSR (tmp)
384 ADD (tmp, x)
385 ROR (tmp)
386 LSR (tmp)
387 ADD (tmp, x)
388 ROR (tmp)
389 LSR (tmp)
390 ADD (tmp, x)
391 ROR (tmp)
392 LSR (tmp)
51f43293 393 AND (t, tmp)
f28def6a 394 #undef tmp
46a8d83c 395 ADD (acc, t)
3b86ca43
TG		 396
397 //voice 4:
649bb224
TG		 398 MOV (Ml, i2)
399 SWAP (Ml)
400 ANDI (Ml, 0xf0)
401 LSL (Ml)
402 LSL (Ml)
8ee3310e 403 #define tmp _
649bb224
TG		 404 MOV (tmp, i1)
405 LSR (tmp)
406 LSR (tmp)
407 OR (Ml, tmp)
408 #undef tmp
18426c43
TG		 409 MOV (Mh, i3)
410 SWAP (Mh)
411 ANDI (Mh, 0xf0)
412 LSL (Mh)
413 LSL (Mh)
414 #define tmp _
415 MOV (tmp, i2)
416 LSR (tmp)
417 LSR (tmp)
418 OR (Mh, tmp)
419 #undef tmp
dbf91c38 420 RCALL mod3();
e4f7baf0
TG		 421 SUB (t, n)
422 NEG (t)
902cfdea 423 SUBI (t, -8)
965274e2 424 RCALL g();
c6c6cbe5
TG		 425 LSR (t)
426 ANDI (t, 3)
9548359d 427 INC (s)
37bf20ea 428 #define tmp _
9548359d 429 MOV (tmp, s)
d8af0686 430 LSR (tmp)
9548359d 431 ADD (tmp, s)
d8af0686
TG		 432 ROR (tmp)
433 LSR (tmp)
434 LSR (tmp)
9548359d 435 ADD (tmp, s)
d8af0686 436 ROR (tmp)
9548359d 437 ADD (tmp, s)
d8af0686
TG		 438 ROR (tmp)
439 LSR (tmp)
440 LSR (tmp)
51f43293 441 AND (t, tmp)
d8af0686 442 #undef tmp
46a8d83c 443 ADD (acc, t)
bfce2f8c 444
95fa231f 445 putchar(acc<<4); //TODO
89f35588 446 SUBI (i0, -1)
95fa231f
TG		 447 ADC (i1, zero, !i0)
448 ADC (i2, zero, !i0&&!i1)
449 ADC (i3, zero, !i0&&!i1&&!i2)
fe9a76e4 450 }
61fab018 451}
Chiptunes on an ATTiny4 (35c3 lightling talk)
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