gcc/testsuite/gcc.c-torture/execute/builtins/pr22237.c

   1 extern void abort (void);
   2 extern void exit (int);
   3 struct s { unsigned char a[256]; };
   4 union u { struct { struct s b; int c; } d; struct { int c; struct s b; } e; };
   5 static union u v;
   6 static union u v0;
   7 static struct s *p = &v.d.b;
   8 static struct s *q = &v.e.b;
   9
  10 static inline struct s rp (void) { return *p; }
  11 static inline struct s rq (void) { return *q; }
  12 static void pq (void) { *p = rq(); }
  13 static void qp (void) { *q = rp(); }
  14
  15 static void
  16 init (struct s *sp)
  17 {
  18   int i;
  19   for (i = 0; i < 256; i++)
  20     sp->a[i] = i;
  21 }
  22
  23 static void
  24 check (struct s *sp)
  25 {
  26   int i;
  27   for (i = 0; i < 256; i++)
  28     if (sp->a[i] != i)
  29       abort ();
  30 }
  31
  32 void
  33 main_test (void)
  34 {
  35   v = v0;
  36   init (p);
  37   qp ();
  38   check (q);
  39   v = v0;
  40   init (q);
  41   pq ();
  42   check (p);
  43   exit (0);
  44 }