new version

[Chiptunes.git] / foo.c

#include <stdio.h>
#include "fakeasm.h"
typedef unsigned char u8;

u8 data[] = {   
	0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
	0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
};
u8 i0;
u8 i1;
u8 i2;
u8 i3;
u8 x;
u8 t;
u8 o;
void g(void) {
	// g(i, x, t, o) -> t
	u8 tmp;
	ANDI	(t, 0x07)
	MOV	(tmp, i2)
	ANDI	(tmp, 3)
	TST	(tmp)
	BREQ	(skip)
	SUBI	(t, -8)
	skip:
	t = data[t];
	t = ((i3<<24|i2<<16|i1<<8|i0)*t) >> o;
	AND	(t, x)
	ANDI	(t, 3)
	RET
};

int main(void) {
	u8 n;
	u8 s;
	u8 acc;
	//TODO: clear all vars/registers
	for (;;) {
		acc = 0;
		n = (i2<<2 | i1>>6);
		s = (i3<<7 | i2>>1);

		//voice 1:
		LDI	(x, 1)
		MOV	(t, n)
		LDI	(o, 12)
		RCALL	g();
		MOV	(acc, t)

		//voice 2:
		MOV	(x, s)
		#define tmp o
		MOV	(tmp, i2)
		LSL	(tmp)
		LSL	(tmp)
		LSL	(tmp)
		MOV	(t, i1)
		t >>= 5;
		OR	(t, tmp)
		#undef tmp
		EOR	(t, n)
		LDI	(o, 10)
		RCALL	g();
		ADD	(acc, t)

		//voice 3:
		x = s / 3;
		t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
		LDI	(o, 10)
		RCALL	g();
		ADD	(acc, t)

		//voice 4:
		x = s / 5;
		t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
		LDI	(o, 9)
		RCALL	g();
		ADD	(acc, t)

		putchar(acc<<4);
		#define tmp acc
		LDI	(tmp, 0)
		SUBI	(i0, -1)
		ADC	(i1, tmp, !i0)
		ADC	(i2, tmp, !i0&&!i1)
		ADC	(i3, tmp, !i0&&!i1&&!i2)
		#undef tmp
	}
}