foo.c

   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(int i) {
  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 = (i*t) >> o;
  28         AND     (t, x)
  29         ANDI    (t, 3)
  30         RET
  31 };
  32
  33 int main(void) {
  34         int i = 0;
  35         unsigned short n;
  36         unsigned short s;
  37         u8 acc;
  38         //TODO: clear all vars/registers
  39         for (;;) {
  40                 acc = 0;
  41                 n = (i2<<2 | i1>>6);
  42                 s = (i3<<7 | i2>>1);
  43
  44                 //voice 1:
  45                 LDI     (x, 1)
  46                 MOV     (t, n)
  47                 LDI     (o, 12)
  48                 RCALL   g(i);
  49                 MOV     (acc, t)
  50
  51                 //voice 2:
  52                 MOV     (x, s)
  53                 t = n ^ i >> 13;
  54                 LDI     (o, 10)
  55                 RCALL   g(i);
  56                 ADD     (acc, t)
  57
  58                 //voice 3:
  59                 x = s / 3;
  60                 t = n + ((i >> 11) % 3);
  61                 LDI     (o, 10)
  62                 RCALL   g(i);
  63                 ADD     (acc, t)
  64
  65                 //voice 4:
  66                 x = s / 5;
  67                 t = 8 + n - ((i >> 10) % 3);
  68                 LDI     (o, 9)
  69                 RCALL   g(i);
  70                 ADD     (acc, t)
  71
  72                 putchar(acc<<4);
  73                 i++;
  74                 #define tmp acc
  75                 LDI     (tmp, 0)
  76                 SUBI    (i0, -1)
  77                 ADC     (i1, tmp, !i0)
  78                 ADC     (i2, tmp, !i0&&!i1)
  79                 ADC     (i3, tmp, !i0&&!i1&&!i2)
  80         }
  81 }