gcc/testsuite/gcc.dg/20100906-1.c

   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 }