int __usercall sub_10001000@<eax>(unsigned int a1@<eax>, int a2@<ecx>)
{
  unsigned __int16 v2; // dx@1
  unsigned int v3; // eax@1

  v2 = (unsigned __int8)a1;
  v3 = a1 >> 8;
  return *(_DWORD *)(a2 + 4 * v2 + 3144)
       + (*(_DWORD *)(a2 + 4 * (unsigned __int8)v3 + 2120) ^ (*(_DWORD *)(a2 + 4 * BYTE1(v3) + 1096)
                                                            + *(_DWORD *)(a2
                                                                        + 4 * ((unsigned __int16)(v3 >> 8) >> 8)
                                                                        + 72)));
}