1  /* { dg-options "-O2" } */
       2  
       3  int test()
       4  {
       5    int offset, len;
       6    register char *mid;
       7    register char *midend;
       8    register char *bigend;
       9    long unsigned int curlen;
      10    if (offset + len > curlen) {
      11      while (midend > mid)
      12        *--bigend = *--midend;
      13    }
      14  }