F64 _twistedBitsGet() {
  U64 n = _rdtsc();
  //n = (n & 0xffffffff00000000) | ((n & 0xffff0000) >> 16) | ((n & 0xffff) << 16);
  //n |= (n & 1) << 1;
  F64 a = (F64)((n >> 32) ^ _reverseBits(n & 0xffffffff)) / 0xffffffff;

  void _smooth() {
    if(0.25 <= a && a < 0.5)
      a -= 0.26;
    else if(0.5 <= a && a < 0.75)
      a -= 0.52;
    else if(0.75 <= a && a < 1.0)
      a -= 0.78;

    a *= 4;
  }

  //n  &= ~(1 << 1);

  //_smooth();
  _smooth();
  _smooth();
  _smooth();
  _smooth();

  if(a < 0.1 && a > 0.7)
    return _twistedBitsGet();
  //else
  return a;
  /*
  U64 ret = 0;

  for(U32 i = 0; i < bitsPossSize; ++i)
  {
    if(n & (1 << (i + bitPoss[i])))
      ret |= 1 << i;
  }
  return ((F64)ret) / (1 << bitsPossSize);
  */
}