1  /* PR rtl-optimization/91720 */
       2  /* { dg-do run } */
       3  /* { dg-options "-Og -fno-forward-propagate -frerun-cse-after-loop -fno-tree-fre" } */
       4  
       5  unsigned a, b;
       6  
       7  int
       8  main ()
       9  {
      10  #if __CHAR_BIT__ == 8
      11    unsigned c = 1;
      12    unsigned long long d = 0;
      13    unsigned char e = 0;
      14    e = __builtin_sub_overflow (d, e, &a) ? 0 : 0x80;
      15    e = e << 7 | e >> c;
      16    __builtin_memmove (&d, &a, 2);
      17    b = e;
      18    if (b != 0x40)
      19      __builtin_abort ();
      20  #endif
      21    return 0;
      22  }