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1 | #include <stdio.h> | |
2 | #include "fakeasm.h" | |
3 | typedef unsigned char u8; | |
4 | ||
5 | u8 i0, i1, i2; //MEM | |
6 | u8 n; //MEM | |
7 | u8 sample; //MEM | |
8 | u8 tmp_1; //MEM | |
9 | u8 acc; //ACC | |
10 | ||
11 | u8 notes[] = { | |
12 | 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58, | |
13 | 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58 | |
14 | }; | |
15 | ||
16 | u8 mod3hi, mod3lo; //MEM | |
17 | //todo: can mod3hi be aliased to tmp_1? | |
18 | void mod3(void) { | |
19 | MOV (acc,mod3hi) | |
20 | ADD (mod3lo,acc) // mod3lo = hi+lo | |
21 | CLEAR (acc) | |
22 | ADDC0 (acc) // mod3hi, 1bit | |
23 | SWAP (acc) | |
24 | MOV (mod3hi, acc) | |
25 | ||
26 | MOV (acc, mod3lo) | |
27 | SWAP (acc) | |
28 | AND (acc, 0xf) // (mod3lo>>4) | |
29 | XCH (mod3lo) // acc=mod3lo, mod3lo=mod3lo>>4 | |
30 | AND (acc, 0xF) // acc=mod3lo&0xf, mod3lo=mod3lo>>4 | |
31 | ADD (acc, mod3lo) // (mod3lo & 0xF) | |
32 | ADD (acc, mod3hi) | |
33 | MOV (mod3lo, acc) | |
34 | ||
35 | AND (acc, 0x3) // acc = (mod3lo & 0x3) | |
36 | SR (mod3lo) | |
37 | SR (mod3lo) // (mod3lo >> 2) | |
38 | ADD (acc, mod3lo) | |
39 | MOV (mod3lo, acc) | |
40 | ||
41 | AND (acc, 0x3) // acc = (mod3lo & 0x3) | |
42 | SR (mod3lo) | |
43 | SR (mod3lo) // (mod3lo >> 2) | |
44 | ADD (acc, mod3lo) | |
45 | ||
46 | if (acc > 2) { // TODO: acc in [0,1,2,3,4] | |
47 | SUB (acc,3) | |
48 | } | |
49 | } | |
50 | ||
51 | void g(void){ | |
52 | u8 notes_ix = acc & 0x7; | |
53 | if(3&i2) | |
54 | notes_ix += 8; | |
55 | u8 result = ((i1<<8|i0)*notes[notes_ix])>>8; // keep hi byte | |
56 | acc = result; | |
57 | } | |
58 | void main(void){ | |
59 | CLEAR (i0) | |
60 | CLEAR (i1) | |
61 | CLEAR (i2) | |
62 | for(;;) { | |
63 | MOV (acc, i2)// "mov mem,mem" | |
64 | MOV (n, acc)// does not exist | |
65 | SL (n) | |
66 | SL (n) | |
67 | MOV (acc, i1) | |
68 | SWAP (acc) | |
69 | AND (acc, 0xf) | |
70 | SR (acc) | |
71 | SR (acc) | |
72 | OR (n, acc) | |
73 | ||
74 | MOV (acc, n) | |
75 | CALL (g) | |
76 | SWAP (acc) | |
77 | AND (acc, 0x1) | |
78 | MOV (sample, acc) | |
79 | ||
80 | MOV (acc, i2) | |
81 | SL (acc) | |
82 | SL (acc) | |
83 | SL (acc) | |
84 | MOV (tmp_1, acc) // fresh tmp_1: | |
85 | MOV (acc, i1) | |
86 | SWAP (acc) | |
87 | AND (acc, 0xf) | |
88 | SR (acc) | |
89 | OR (acc, tmp_1) // tmp_1 done. | |
90 | XOR (acc, n) | |
91 | CALL (g) | |
92 | SR (acc) | |
93 | AND (acc, i2) | |
94 | SR (acc) | |
95 | AND (acc, 3) | |
96 | ADD (sample, acc) | |
97 | ||
98 | mod3hi = i2>>3; | |
99 | MOV(acc, i2) | |
100 | SWAP(acc) | |
101 | AND(acc, 0xf0) | |
102 | SL(acc) | |
103 | MOV(mod3lo, acc) | |
104 | MOV(acc, i1) | |
105 | SR(acc) | |
106 | SR(acc) | |
107 | SR(acc) | |
108 | OR(mod3lo, acc) | |
109 | CALL (mod3) | |
110 | ADD (acc, n) | |
111 | CALL (g) | |
112 | SR (acc) | |
113 | SR (acc) | |
114 | MOV (tmp_1, acc) // acc saved in tmp_1; fresh acc | |
115 | MOV (acc, i2) | |
116 | // shift-divide by six | |
117 | // note: i2 is max 0x78; so acc will <= 20. (breaks vor values >=128) | |
118 | SR (acc) | |
119 | ADD (acc, i2) | |
120 | SR (acc) | |
121 | SR (acc) | |
122 | ADD (acc, i2) | |
123 | SR (acc) | |
124 | SR (acc) | |
125 | ADD (acc, i2) | |
126 | SR (acc) | |
127 | SR (acc) | |
128 | SR (acc) | |
129 | // end divide by six | |
130 | AND (acc, tmp_1) // acc restored from tmp_1 | |
131 | AND (acc, 3) | |
132 | ADD (sample, acc) | |
133 | ||
134 | mod3hi = i2>>2; | |
135 | mod3lo = i2<<6|i1>>2; | |
136 | CALL (mod3) | |
137 | SUB (acc, n) | |
138 | SUB (acc, 8) | |
139 | NEG (acc) | |
140 | CALL (g) | |
141 | SR (acc) | |
142 | MOV (tmp_1, acc) // acc saved in tmp_1; fresh acc | |
143 | MOV (acc, i2) | |
144 | // shift-divide by ten | |
145 | // note: i2 is max 0x78; so acc will <= 12. | |
146 | INC (i2) | |
147 | SR (acc) | |
148 | ADD (acc, i2) | |
149 | SR (acc) | |
150 | SR (acc) | |
151 | SR (acc) | |
152 | ADD (acc, i2) | |
153 | SR (acc) | |
154 | ADD (acc, i2) | |
155 | SWAP (acc) | |
156 | DEC (i2) | |
157 | // end divide by ten | |
158 | AND (acc, tmp_1) // acc restored from tmp_1 | |
159 | AND (acc, 3) | |
160 | ADD (sample, acc) | |
161 | ||
162 | MOV (acc, sample) | |
163 | SWAP (acc) | |
164 | putchar(acc); | |
165 | ||
166 | INC (i0) | |
167 | i1 += !i0; // ADDC i1 | |
168 | i2 += !i1 && !i0; // ADDC i2 | |
169 | ||
170 | if(i2 == 0x78) break; | |
171 | } | |
172 | } |