0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
};
+u8 zero; //zero register
u8 i0;
u8 i1;
u8 i2;
u8 x;
u8 t;
u8 o;
-u8 g(int i) {
- u8 tmp;
+u8 _;
+#define Mh o //mod3 vars
+#define Ml t // -"-
+//http://homepage.divms.uiowa.edu/~jones/bcd/mod.shtml
+void mod3(void) {
+ // mod3(Mh.Ml) -> t
+ #define tmp _
+ ADD (Ml, Mh)
+ CLR (Mh)
+ ADC (Mh, zero, carry) //Mh only holds the carry bit
+ MOV (tmp, Ml)
+ SWAP (tmp)
+ ANDI (tmp, 0x0f)
+ SWAP (Mh)
+ OR (tmp, Mh)
+ ANDI (Ml, 0x0f)
+ ADD (Ml, tmp)
+ MOV (tmp, Ml)
+ LSR (tmp)
+ LSR (tmp)
+ ANDI (Ml, 0x03)
+ ADD (Ml, tmp)
+ MOV (tmp, Ml)
+ LSR (tmp)
+ LSR (tmp)
+ ANDI (Ml, 0x03)
+ ADD (Ml, tmp)
+ CPI (Ml, 3)
+ BRPL (skip)
+ SUBI (Ml, 3)
+ skip:;
+ RET
+ #undef tmp
+}
+void g(void) {
+ // g(i, t) -> t
+ // tempvars: `x` and `_`
+ #define tmp _
ANDI (t, 0x07)
MOV (tmp, i2)
ANDI (tmp, 3)
TST (tmp)
+ #undef tmp
BREQ (skip)
SUBI (t, -8)
skip:
t = data[t];
- t = (i*t) >> o;
- AND (t, x)
- ANDI (t, 3)
- return t;
+ /*MOV X_hi==_, data_hi
+ MOV X_lo==t, data_lo
+ ADD X_lo, t
+ ADC X_hi, zero
+ LD t, X */
+ t = (((i1&0x1f)<<8|i0)*t)>>8; //TODO
+ RET //TODO: CALL/RET is expensive; store PC in register and RJMP, then JRMP back
};
int main(void) {
- int i = 0;
- unsigned short n;
- unsigned short s;
+ u8 n;
+ u8 s;
u8 acc;
+ //TODO: clear all vars/registers
for (;;) {
- acc = 0;
- n = i >> 14;
- s = i >> 17;
+ MOV (n, i2)
+ LSL (n)
+ LSL (n)
+ #define tmp acc
+ MOV (tmp, i1)
+ SWAP (tmp)
+ ANDI (tmp, 0x0f)
+ LSR (tmp)
+ LSR (tmp)
+ OR (n, tmp)
+ #undef tmp
+ MOV (s, i3)
+ ROR (s)
+ ROR (s)
+ ANDI (s, 0x80)
+ #define tmp acc
+ MOV (tmp, i2)
+ LSR (tmp)
+ OR (s, tmp)
+ #undef tmp
//voice 1:
- LDI (x, 1)
MOV (t, n)
- LDI (o, 12)
- acc += g(i);
+ LDI (o, 4)
+ RCALL g();
+ t >>= o; //NOTE: o == {1, 2, 4}
+ ANDI (t, 3)
+ ANDI (t, 1)
+ MOV (acc, t)
//voice 2:
- MOV (x, s)
- t = n ^ i >> 13;
- LDI (o, 10)
- acc += g(i);
+ #define tmp o
+ MOV (tmp, i2)
+ LSL (tmp)
+ LSL (tmp)
+ LSL (tmp)
+ MOV (t, i1)
+ SWAP (t)
+ ANDI (t, 0xf)
+ LSR (t)
+ OR (t, tmp)
+ #undef tmp
+ EOR (t, n)
+ LDI (o, 2)
+ RCALL g();
+ t >>= o; //NOTE: o == {1, 2, 4}
+ ANDI (t, 3)
+ AND (t, s)
+ ADD (acc, t)
//voice 3:
- x = s / 3;
- t = n + ((i >> 11) % 3);
- LDI (o, 10)
- acc += g(i);
+ MOV (Ml, i2)
+ SWAP (Ml)
+ ANDI (Ml, 0xf0)
+ LSL (Ml)
+ #define tmp Mh
+ MOV (tmp, i1)
+ LSR (tmp)
+ LSR (tmp)
+ LSR (tmp)
+ OR (Ml, tmp)
+ #undef tmp
+ MOV (Mh, i3)
+ SWAP (Mh)
+ ANDI (Mh, 0xf0)
+ LSL (Mh)
+ #define tmp _
+ MOV (tmp, i2)
+ LSR (tmp)
+ LSR (tmp)
+ LSR (tmp)
+ OR (Mh, tmp)
+ #undef tmp
+ RCALL mod3();
+ ADD (t, n)
+ LDI (o, 2)
+ RCALL g();
+ t >>= o; //NOTE: o == {1, 2, 4}
+ ANDI (t, 3)
+ MOV (x, s)
+ INC (x)
+ #define tmp o
+ MOV (tmp, x)
+ LSR (tmp)
+ LSR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ LSR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ LSR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ LSR (tmp)
+ MOV (x, tmp)
+ #undef tmp
+ AND (t, x)
+ ADD (acc, t)
//voice 4:
- x = s / 5;
- t = 8 + n - ((i >> 10) % 3);
- LDI (o, 9)
- acc += g(i);
+ MOV (Ml, i2)
+ SWAP (Ml)
+ ANDI (Ml, 0xf0)
+ LSL (Ml)
+ LSL (Ml)
+ #define tmp Mh
+ MOV (tmp, i1)
+ LSR (tmp)
+ LSR (tmp)
+ OR (Ml, tmp)
+ #undef tmp
+ MOV (Mh, i3)
+ SWAP (Mh)
+ ANDI (Mh, 0xf0)
+ LSL (Mh)
+ LSL (Mh)
+ #define tmp _
+ MOV (tmp, i2)
+ LSR (tmp)
+ LSR (tmp)
+ OR (Mh, tmp)
+ #undef tmp
+ RCALL mod3();
+ SUB (t, n)
+ NEG (t)
+ SUBI (t, -8)
+ LDI (o, 1)
+ RCALL g();
+ t >>= o; //NOTE: o == {1, 2, 4}
+ ANDI (t, 3)
+ MOV (x, s)
+ INC (x)
+ #define tmp o
+ MOV (tmp, x)
+ LSR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ LSR (tmp)
+ LSR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ ADD (tmp, x)
+ ROR (tmp)
+ LSR (tmp)
+ LSR (tmp)
+ MOV (x, tmp)
+ #undef tmp
+ AND (t, x)
+ ADD (acc, t)
- putchar(acc<<4);
- i++;
- i0 = i;
- i1 = i>>8;
- i2 = i>>16;
- i3 = i>>24;
+ putchar(acc<<4); //TODO
+ SUBI (i0, -1)
+ ADC (i1, zero, !i0)
+ ADC (i2, zero, !i0&&!i1)
+ ADC (i3, zero, !i0&&!i1&&!i2)
}
}
git://git.gir.st / Chiptunes.git / blobdiff