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extern void abort (void);
struct A
{
struct A *a;
};
struct B
{
struct A *b;
};
__attribute__((noinline))
struct A *
foo (struct A *x)
{
asm volatile ("" : : "g" (x) : "memory");
return x;
}
__attribute__((noinline))
void
bar (struct B *w, struct A *x, struct A *y, struct A *z)
{
struct A **c;
c = &w->b;
*c = foo (x);
while (*c)
c = &(*c)->a;
*c = foo (y);
while (*c)
c = &(*c)->a;
*c = foo (z);
}
struct B d;
struct A e, f, g;
int
main (void)
{
f.a = &g;
bar (&d, &e, &f, 0);
if (d.b == 0
|| d.b->a == 0
|| d.b->a->a == 0
|| d.b->a->a->a != 0)
abort ();
return 0;
}
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