1  /* { dg-do run } */
       2  /* { dg-options "-O2" } */
       3  /* { dg-options "-O2 -fno-short-enums -Wl,--no-enum-size-warning" {target arm_eabi} } */
       4  
       5  /* This testcase got misoptimized by combine due to a wrong setting of
       6     subst_low_luid in try_combine.  */
       7  
       8  enum rtx_code {
       9    A, B
      10  };
      11  
      12  void abort (void);
      13  
      14  struct rtx_def {
      15    __extension__ enum rtx_code code:16;
      16  };
      17  typedef struct rtx_def *rtx;
      18  
      19  void __attribute__((noinline))
      20  add_constraint (unsigned char is_a)
      21  {
      22    if (is_a)
      23      abort ();
      24  }
      25  
      26  void __attribute__((noinline))
      27  foo (rtx defn)
      28  {
      29    switch (defn->code)
      30      {
      31      case A:
      32      case B:
      33        add_constraint (defn->code == A);
      34        break;
      35      default:
      36        break;
      37      }
      38  }
      39  
      40  int
      41  main ()
      42  {
      43    struct rtx_def r;
      44  
      45    r.code = B;
      46  
      47    foo (&r);
      48    return 0;
      49  }