gcc/testsuite/gcc.c-torture/execute/pr30778.c

   1 extern void *memset (void *, int, __SIZE_TYPE__);
   2 extern void abort (void);
   3
   4 struct reg_stat {
   5   void *last_death;
   6   void *last_set;
   7   void *last_set_value;
   8   int   last_set_label;
   9   char  last_set_sign_bit_copies;
  10   int   last_set_mode : 8;
  11   char  last_set_invalid;
  12   char sign_bit_copies;
  13   long nonzero_bits;
  14 };
  15
  16 static struct reg_stat *reg_stat;
  17
  18 void __attribute__((noinline))
  19 init_reg_last (void)
  20 {
  21   memset (reg_stat, 0, __builtin_offsetof (struct reg_stat, sign_bit_copies));
  22 }
  23
  24 int main (void)
  25 {
  26   struct reg_stat r;
  27
  28   reg_stat = &r;
  29   r.nonzero_bits = -1;
  30   init_reg_last ();
  31   if (r.nonzero_bits != -1)
  32     abort ();
  33   return 0;
  34 }