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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 | void g(void){ | |
17 | u8 notes_ix = acc & 0x7; | |
18 | if(3&i2) | |
19 | notes_ix += 8; | |
20 | u8 result = ((i1<<8|i0)*notes[notes_ix])>>8; // keep hi byte | |
21 | acc = result; | |
22 | } | |
23 | void main(void){ | |
24 | CLEAR (i0) | |
25 | CLEAR (i1) | |
26 | CLEAR (i2) | |
27 | for(;;) { | |
28 | MOV (acc, i2)// "mov mem,mem" | |
29 | MOV (n, acc)// does not exist | |
30 | SL (n) | |
31 | SL (n) | |
32 | MOV (acc, i1) | |
33 | SWAP (acc) | |
34 | AND (acc, 0xf) | |
35 | SR (acc) | |
36 | SR (acc) | |
37 | OR (n, acc) | |
38 | ||
39 | MOV (acc, n) | |
40 | CALL (g) | |
41 | SWAP (acc) | |
42 | AND (acc, 0x1) | |
43 | MOV (sample, acc) | |
44 | ||
45 | MOV (acc, i2) | |
46 | SL (acc) | |
47 | SL (acc) | |
48 | SL (acc) | |
49 | MOV (tmp_1, acc) // fresh tmp_1: | |
50 | MOV (acc, i1) | |
51 | SWAP (acc) | |
52 | AND (acc, 0xf) | |
53 | SR (acc) | |
54 | OR (acc, tmp_1) // tmp_1 done. | |
55 | XOR (acc, n) | |
56 | CALL (g) | |
57 | SR (acc) | |
58 | AND (acc, i2) | |
59 | SR (acc) | |
60 | AND (acc, 3) | |
61 | ADD (sample, acc) | |
62 | ||
63 | { u8 tmp2 = (i2<<5|i1>>3)%3;//TODO | |
64 | MOV (acc, tmp2) | |
65 | ADD (acc, n) | |
66 | CALL (g) | |
67 | } //tmp2 | |
68 | SR (acc) | |
69 | SR (acc) | |
70 | MOV (tmp_1, acc) // acc saved in tmp_1; fresh acc | |
71 | MOV (acc, i2) | |
72 | // shift-divide by six | |
73 | // note: i2 is max 0x78; so acc will <= 20. (breaks vor values >=128) | |
74 | SR (acc) | |
75 | ADD (acc, i2) | |
76 | SR (acc) | |
77 | SR (acc) | |
78 | ADD (acc, i2) | |
79 | SR (acc) | |
80 | SR (acc) | |
81 | ADD (acc, i2) | |
82 | SR (acc) | |
83 | SR (acc) | |
84 | SR (acc) | |
85 | // end divide by six | |
86 | AND (acc, tmp_1) // acc restored from tmp_1 | |
87 | AND (acc, 3) | |
88 | ADD (sample, acc) | |
89 | ||
90 | MOV (acc, n) | |
91 | ADD (acc, 8) | |
92 | { u8 tmp3 = (i2<<6|i1>>2)%3; | |
93 | SUB (acc, tmp3) | |
94 | } // tmp3 | |
95 | CALL (g) | |
96 | SR (acc) | |
97 | MOV (tmp_1, acc) // acc saved in tmp_1; fresh acc | |
98 | MOV (acc, i2) | |
99 | // shift-divide by ten | |
100 | // note: i2 is max 0x78; so acc will <= 12. | |
101 | i2++; | |
102 | acc >>= 1; | |
103 | acc += i2; | |
104 | ||
105 | acc >>= 1; | |
106 | acc += 0; | |
107 | ||
108 | acc >>= 1; | |
109 | acc += 0; | |
110 | ||
111 | acc >>= 1; | |
112 | acc += i2; | |
113 | ||
114 | acc >>= 1; | |
115 | acc += i2; | |
116 | ||
117 | acc >>= 1; | |
118 | acc += 0; | |
119 | ||
120 | acc >>= 1; | |
121 | acc += 0; | |
122 | ||
123 | acc >>= 1; | |
124 | acc += 0; | |
125 | ||
126 | acc >>= 1; | |
127 | i2--; | |
128 | ||
129 | // end divide by ten | |
130 | AND (acc, tmp_1) // acc restored from tmp_1 | |
131 | AND (acc, 3) | |
132 | ADD (sample, acc) | |
133 | ||
134 | MOV (acc, sample) | |
135 | SWAP (acc) | |
136 | putchar(acc); | |
137 | ||
138 | INC (i0) | |
139 | i1 += !i0; // ADDC i1 | |
140 | i2 += !i1 && !i0; // ADDC i2 | |
141 | } | |
142 | } |