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/* https://bugzilla.redhat.com/show_bug.cgi?id=521991#c5

   Distilled from Linux XFS source code.  foo, inlined into bar, ends

   up with debug stmts referencing the addressable variable b.

   Optimization made it non-addressable, and then completely optimized

   away, before we got a chance to rename (and discard) the occurrence

   in the debug stmt.  When we did, we crashed, attempting to rename

   an unreference variable.  */

/* { dg-do compile } */

static inline int

foo (void *x, unsigned y)

{

  unsigned z = *(unsigned long *) x % y;

  *(unsigned long *) x = *(unsigned long *) x / y;

  return z;

}

struct S

{

  unsigned t;

};

void

bar (struct S *x, int *y)

{

  int a = 0;

  unsigned long b = x->t;

  foo (&b, x->t);

  for (;; a++)

    if (b)

      *y = 1;

}