| | 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 = ((i3<<24|i2<<16|i1<<8|i0)*t) >> 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 | acc = 0; |
| | 40 | n = (i2<<2 | i1>>6); |
| | 41 | s = (i3<<7 | i2>>1); |
| | 42 | |
| | 43 | //voice 1: |
| | 44 | LDI (x, 1) |
| | 45 | MOV (t, n) |
| | 46 | LDI (o, 12) |
| | 47 | RCALL g(); |
| | 48 | MOV (acc, t) |
| | 49 | |
| | 50 | //voice 2: |
| | 51 | MOV (x, s) |
| | 52 | #define tmp o |
| | 53 | MOV (tmp, i2) |
| | 54 | LSL (tmp) |
| | 55 | LSL (tmp) |
| | 56 | LSL (tmp) |
| | 57 | MOV (t, i1) |
| | 58 | t >>= 5; |
| | 59 | OR (t, tmp) |
| | 60 | #undef tmp |
| | 61 | t = n ^ (o | t); |
| | 62 | LDI (o, 10) |
| | 63 | RCALL g(); |
| | 64 | ADD (acc, t) |
| | 65 | |
| | 66 | //voice 3: |
| | 67 | x = s / 3; |
| | 68 | t = n + ((i3<<13 | i2<<5 | i1>>3) % 3); |
| | 69 | LDI (o, 10) |
| | 70 | RCALL g(); |
| | 71 | ADD (acc, t) |
| | 72 | |
| | 73 | //voice 4: |
| | 74 | x = s / 5; |
| | 75 | t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3); |
| | 76 | LDI (o, 9) |
| | 77 | RCALL g(); |
| | 78 | ADD (acc, t) |
| | 79 | |
| | 80 | putchar(acc<<4); |
| | 81 | #define tmp acc |
| | 82 | LDI (tmp, 0) |
| | 83 | SUBI (i0, -1) |
| | 84 | ADC (i1, tmp, !i0) |
| | 85 | ADC (i2, tmp, !i0&&!i1) |
| | 86 | ADC (i3, tmp, !i0&&!i1&&!i2) |
| | 87 | #undef tmp |
| | 88 | } |
| | 89 | } |
git://git.gir.st / Chiptunes.git / blame_incremental