1  /* PR tree-optimization/105770 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O1 -funswitch-loops -fno-tree-forwprop" } */
       4  
       5  char a;
       6  
       7  void
       8  foo (void)
       9  {
      10    while (a)
      11      switch (a)
      12        {
      13        case ' ':
      14        case '\t':
      15  	return;
      16        }
      17  
      18    __builtin_unreachable ();
      19  }