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/* PR optimization/5844

   This testcase was miscompiled because of an rtx sharing bug.  */

/* { dg-do run } */

/* { dg-options "-O2" } */

/* { dg-options "-O2 -mtune=i586" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */

struct A

{

  struct A *a;

  int b;

};

struct B

{

  struct A *c;

  unsigned int d;

};

struct A p = { &p, -1 };

struct B q = { &p, 0 };

extern void abort (void);

extern void exit (int);

struct B *

foo (void)

{

  return &q;

}

void

bar (void)

{

  struct B *e = foo ();

  struct A *f = e->c;

  int g = f->b;

  if (++g == 0)

    {

      e->d++;

      e->c = f->a;

    }

  f->b = g;

}

int

main ()

{

  bar ();

  if (p.b != 0 || q.d != 1 || q.c != &p)

    abort ();

  exit (0);

}