chip8 decompiled

chip8.txt

export memory mem(initial: 1, max: 0);

global g_a:int = 512;
global g_b:int = 144;
global g_c:int = 0;
global g_d:int = 0;
global g_e:int = 0;

data d_pPpPPPP(offset: 0) = 
  "\f0\90\90\90\f0`   p\f0\10\f0\80\f0\f0\10\f0\10\f0\a0\a0\f0  \f0\80\f0"
  "\10\f0\f0\80\f0\90\f0\f0\10\10\10\10\f0\90\f0\90\f0\f0\90\f0\10\f0\f0\90"
  "\f0\90\90\f0PpP\f0\f0\80\80\80\f0\f0PPP\f0\f0\80\f0\80\f0\f0\80\f0\80\80"
  "";

import function Math_random():float;

export function run(a:int) {
  var h:int;
  var k:int;
  var j:int;
  var e:int;
  var i:int;
  var e:int;
  var i:int;
  var e:int;
  var f:int;
  var i:int;
  var e:int;
  var i:int;
  var h:int;
  var f:int;
  var e:int;
  var f:int;
  var e:int;
  var f:int;
  var e:int;
  var f:int;
  var e:int;
  var f:int;
  var e:int;
  var e:int;
  var e:int;
  var f:int;
  var e:int;
  var f:int;
  var f:int;
  var f:int;
  var f:int;
  var e:int;
  var f:int;
  var e:int;
  var f:int;
  var f:int;
  var e:int;
  var f:int;
  var j:int;
  var j:int;
  var i:int;
  var f:int;
  var e:int;
  var s:long;
  var g:int;
  var h:int;
  var g:int;
  var e:int;
  var i:int;
  var i:int;
  var e:int;
  var i:int;
  var e:int;
  var e:int;
  var e:int;
  var e:int;
  var e:int;
  var e:int;
  var d:int;
  var m:int;
  var n:int;
  var l:int;
  var n:int;
  var n:int;
  var n:int;
  var d:int;
  var k:int;
  var d:int;
  var e:int;
  var g:int;
  var d:int;
  var e:int;
  var k:int;
  var q:int_ptr;
  var c:int;
  var c:int;
  if (g_d) { g_d = g_d - 1 }
  if (g_e) { g_e = g_e - 1 }
  loop L_d {
    g_a = 
      {
        e = 
          {
            e = 
              {
                ({
                   k = g_a + 2;
                   c = g_a[0]:ubyte;
                   d = c & 15;
                   e = d[96]:ubyte;
                   i = g_a[1]:ubyte;
                   f = (i >> 4)[96]:ubyte;
                   h = i & 15;
                   j = d << 8 | i;
                   br_table[B_aa, B_y, B_z, B_x, B_w, B_v, B_u, B_t, B_s, B_r, B_q, B_p, B_o, B_n, B_m, ..B_l](
                     c >> 4);
                   label B_aa:
                   if (h) {
                     k = g_b[0]:ushort;
                     g_b = g_b + 2;
                     goto B_f;
                   } else {
                     l = 12544;
                     m = 4096;
                     d = 255;
                     goto B_j;
                   }
                   label B_z:
                   g_b = g_b - 2;
                   g_b[0]:short = k;
                   label B_y:
                   j;
                   goto B_e;
                   label B_x:
                   e == i;
                   goto B_i;
                   label B_w:
                   e != i;
                   goto B_i;
                   label B_v:
                   e == f;
                   goto B_i;
                   label B_u:
                   i;
                   goto B_g;
                   label B_t:
                   e + i;
                   goto B_g;
                   label B_s:
                   br_table[B_ka, B_ja, B_ia, B_ha, B_ga, B_fa, B_ea, B_da, ..B_ca](h)
                   label B_ka:
                   f;
                   goto B_g;
                   label B_ja:
                   e | f;
                   goto B_g;
                   label B_ia:
                   e & f;
                   goto B_g;
                   label B_ha:
                   e ^ f;
                   goto B_g;
                   label B_ga:
                   e = e + f;
                   g = e >> 8;
                   e;
                   goto B_h;
                   label B_fa:
                   g = e >= f;
                   e - f;
                   goto B_h;
                   label B_ea:
                   g = f & 1;
                   f >> 1;
                   goto B_h;
                   label B_da:
                   g = f >= e;
                   f - e;
                   goto B_h;
                   label B_ca:
                   g = f >> 7;
                   f << 1;
                   goto B_h;
                   label B_r:
                   e != f;
                   goto B_i;
                   label B_q:
                   g_c = j;
                   goto B_f;
                   label B_p:
                   j + 0[96]:ubyte;
                   goto B_e;
                   label B_o:
                   i32_trunc_f32_u(Math_random() * 256.0f) & i;
                   goto B_g;
                   label B_n:
                   g = 0;
                   n = 0;
                   loop L_la {
                     var o:long_ptr = 31 - (f + n & 31) << 3;
                     var r:long = 
                       i64_extend_i32_u((g_c + n)[0]:ubyte) >> i64_extend_i32_u(e) + 8L;
                     o[512] = (s = o[512]) ^ r;
                     g = g | (s & r) != 0L;
                     n = n + 1;
                     if (n < h) continue L_la;
                   }
                   0[111]:byte = g;
                   goto B_f;
                   label B_m:
                   (0[40]:ushort >> e & 1) ^ i == 161;
                   goto B_i;
                   label B_l:
                   br_table[B_ta, B_sa, B_ra, B_qa, B_qa, B_pa, B_oa, B_oa, B_oa, B_oa, B_na, B_na, ..B_ma](
                     i >> 3)
                   label B_ta:
                   g_d;
                   goto B_g;
                   label B_sa:
                   var b:int = 0[40]:ushort;
                   if (b) {
                     ctz(b);
                     goto B_g;
                   }
                   goto B_c;
                   label B_ra:
                   g_d = e;
                   goto B_f;
                   label B_qa:
                   if (i == 24) { g_e = e } else { g_c = g_c + e & 65535 }
                   goto B_f;
                   label B_pa:
                   g_c = (e & 15) * 5;
                   goto B_f;
                   label B_oa:
                   g_c[0]:byte = e / 100 % 10;
                   g_c[1]:byte = e / 10 % 10;
                   g_c[2]:byte = e % 10;
                   goto B_f;
                   label B_na:
                   l = 96;
                   m = g_c;
                   goto B_k;
                   label B_ma:
                   l = g_c;
                   m = 96;
                   label B_k:
                   g_c = g_c + d + 1 & 65535;
                   label B_j:
                   n = 0;
                   loop L_wa {
                     (m + n)[0]:byte = (l + n)[0]:ubyte;
                     n = n + 1;
                     if (n <= d) continue L_wa;
                   }
                   goto B_f;
                   label B_i:
                 } << 
                 1) + 
                k;
                goto B_e;
                label B_h:
              }
            d[96]:byte = e;
            0[111]:byte = g;
            goto B_f;
            label B_g:
          }
        d[96]:byte = e;
        label B_f:
        k;
        label B_e:
      }
    a = a - 1;
    if (a) continue L_d;
  }
  label B_c:
  var p:ubyte_ptr = 256;
  loop L_xa {
    c = p[4095];
    loop L_ya {
      q[1088] = if (c & 128) { -1 } else { -16777216 }
      c = c << 1;
      q = q + 4;
      if (q & 31) continue L_ya;
    }
    p = p - 1;
    if (p) continue L_xa;
  }
}