gcc/testsuite/gcc.dg/torture/pr56965-1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-fschedule-insns" { target scheduling } } */
   3
   4 extern void abort (void);
   5
   6 struct S {
   7     int i;
   8     int j;
   9 };
  10
  11 struct U {
  12     struct S s;
  13 } __attribute__((may_alias));
  14
  15 int __attribute__((noinline,noclone))
  16 foo (struct U *p, struct U *q)
  17 {
  18   int i;
  19   q->s.j = 1;
  20   i = p->s.i;
  21   return i;
  22 }
  23
  24 int main()
  25 {
  26   int a[3];
  27   int *p = a;
  28   p[1] = 0;
  29   if (foo ((struct U *)(p + 1), (struct U *)p) != 1)
  30     abort ();
  31   return 0;
  32 }