| | 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 i0; |
| | 10 | u8 i1; |
| | 11 | u8 i2; |
| | 12 | u8 i3; |
| | 13 | u8 x; |
| | 14 | u8 t; |
| | 15 | u8 o; |
| | 16 | void g(void) { |
| | 17 | // g(i, x, t, o) -> t |
| | 18 | u8 tmp; |
| | 19 | ANDI (t, 0x07) |
| | 20 | MOV (tmp, i2) |
| | 21 | ANDI (tmp, 3) |
| | 22 | TST (tmp) |
| | 23 | BREQ (skip) |
| | 24 | SUBI (t, -8) |
| | 25 | skip: |
| | 26 | t = data[t]; |
| | 27 | t = (((i1&0x1f)<<8|i0)*t)>>8 >> o; |
| | 28 | AND (t, x) |
| | 29 | ANDI (t, 3) |
| | 30 | RET |
| | 31 | }; |
| | 32 | |
| | 33 | int main(void) { |
| | 34 | u8 n; |
| | 35 | u8 s; |
| | 36 | u8 acc; |
| | 37 | //TODO: clear all vars/registers |
| | 38 | for (;;) { |
| | 39 | MOV (n, i2) |
| | 40 | LSL (n) |
| | 41 | LSL (n) |
| | 42 | #define tmp acc |
| | 43 | MOV (tmp, i1) |
| | 44 | SWAP (tmp) |
| | 45 | ANDI (tmp, 0x0f) |
| | 46 | LSR (tmp) |
| | 47 | LSR (tmp) |
| | 48 | OR (n, tmp) |
| | 49 | #undef tmp |
| | 50 | MOV (s, i3) |
| | 51 | ROR (s) |
| | 52 | ROR (s) |
| | 53 | ANDI (s, 0x80) |
| | 54 | #define tmp acc |
| | 55 | MOV (tmp, i2) |
| | 56 | LSR (tmp) |
| | 57 | OR (s, tmp) |
| | 58 | #undef tmp |
| | 59 | |
| | 60 | //voice 1: |
| | 61 | LDI (x, 1) |
| | 62 | MOV (t, n) |
| | 63 | LDI (o, 4) |
| | 64 | RCALL g(); |
| | 65 | MOV (acc, t) |
| | 66 | |
| | 67 | //voice 2: |
| | 68 | MOV (x, s) |
| | 69 | #define tmp o |
| | 70 | MOV (tmp, i2) |
| | 71 | LSL (tmp) |
| | 72 | LSL (tmp) |
| | 73 | LSL (tmp) |
| | 74 | MOV (t, i1) |
| | 75 | SWAP (t) |
| | 76 | ANDI (t, 0xf) |
| | 77 | LSR (t) |
| | 78 | OR (t, tmp) |
| | 79 | #undef tmp |
| | 80 | EOR (t, n) |
| | 81 | LDI (o, 2) |
| | 82 | RCALL g(); |
| | 83 | ADD (acc, t) |
| | 84 | |
| | 85 | //voice 3: |
| | 86 | MOV (x, s) |
| | 87 | INC (x) |
| | 88 | #define tmp o |
| | 89 | unsigned short sum = 0; |
| | 90 | for(int loop = 0; loop < 4; loop ++) { |
| | 91 | sum >>= 1; |
| | 92 | sum += x; |
| | 93 | sum >>= 1; |
| | 94 | //nop |
| | 95 | } |
| | 96 | sum >>= 1; |
| | 97 | x = sum; |
| | 98 | |
| | 99 | #undef tmp |
| | 100 | t = ((i3&0x01)<<13 | i2<<5 | i1>>3) % 3; |
| | 101 | ADD (t, n) |
| | 102 | LDI (o, 2) |
| | 103 | RCALL g(); |
| | 104 | ADD (acc, t) |
| | 105 | |
| | 106 | //voice 4: |
| | 107 | MOV (x, s) |
| | 108 | INC (x) |
| | 109 | #define tmp o |
| | 110 | x = (x*0x33)>>8; |
| | 111 | #undef tmp |
| | 112 | t = ((i3&0x01)<<14 | i2<<6 | i1>>2) % 3; |
| | 113 | SUB (t, n) |
| | 114 | NEG (t) |
| | 115 | SUBI (t, -8) |
| | 116 | LDI (o, 1) |
| | 117 | RCALL g(); |
| | 118 | ADD (acc, t) |
| | 119 | |
| | 120 | putchar(acc<<4); |
| | 121 | #define tmp acc |
| | 122 | LDI (tmp, 0) |
| | 123 | SUBI (i0, -1) |
| | 124 | ADC (i1, tmp, !i0) |
| | 125 | ADC (i2, tmp, !i0&&!i1) |
| | 126 | ADC (i3, tmp, !i0&&!i1&&!i2) |
| | 127 | #undef tmp |
| | 128 | } |
| | 129 | } |
git://git.gir.st / Chiptunes.git / blame_incremental