LFSR 128-bit algorithm (C++)

#include "stdafx.h"
#include <iostream>
#include <bitset>
using namespace std;

int LFSR (void)
{
  static unsigned long SHH = 0xFFFFFFFF;
  static unsigned long SHL = 0xFFFFFFFF;
  static unsigned long SLH = 0xFFFFFFFF;
  static unsigned long SLL = 0xFFFFFFFF;

  char counter = 32;
  unsigned int value = 0;
  do {
    int S = (( (SLL>>2)^(SLL>>27)^(SLL>>29)^SLL ) & 1);
    SLL = (SLL>>1) | ((SLH & 1)<<31);
    SLH = (SLH>>1) | ((SHL & 1)<<31);
    SHL = (SHL>>1) | ((SHH & 1)<<31);
    SHH = (SHH>>1) | (S<<31);
    counter--;
    value = (value<<1) | (SLL & 1);
  } while (counter > 0);
  return value;
}

int _tmain(int argc, _TCHAR* argv[])
{
  for (int i=0; i<0xFFFF; i++) {
    std::cout << std::bitset<32>(LFSR());
  }
  std::getchar();
  return 0;
}