new version

[Chiptunes.git] / foo.c

diff --git a/foo.c b/foo.c
index 3e3af85e1bb791a6567e496b9ed2ceff166df6c0..06ff396e4838d7e6f9ad853555554167eaf8da66 100644 (file)
--- a/foo.c
+++ b/foo.c
@@ -1,22 +1,86 @@
 #include <stdio.h>
 #include <stdio.h>

+#include "fakeasm.h"

 typedef unsigned char u8;
 typedef unsigned char u8;

-int g(int i, int x, int t, int o) {
-       return ((3 & x & (i * ((3 & i >> 16 ? "BY}6YB6%" : "Qj}6jQ6%")[t % 8] + 51) >> o)));
+
+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) {
 };
 
 int main(void) {

-       int i;
-       int n;
-       int s;
+       u8 n;
+       u8 s;

        u8 acc;
        u8 acc;

-       for (i = 0;; i++) {
+       //TODO: clear all vars/registers
+       for (;;) {

                acc = 0;
                acc = 0;

-               n = i >> 14;
-               s = i >> 17;
-               acc += g(i, 1, n, 12);
-               acc += g(i, s, n ^ i >> 13, 10);
-               acc += g(i, s / 3, n + ((i >> 11) % 3), 10);
-               acc += g(i, s / 5, 8 + n - ((i >> 10) % 3), 9);
+               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     (o, i2)
+               LSL     (o)
+               LSL     (o)
+               LSL     (o)
+               #undef tmp
+               t = n ^ (o | i1>>5);
+               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);
                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

        }
 }
        }
 }