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/* { dg-do compile } */

/* { dg-options "-O1 -fdump-tree-dom2" } */

extern void abort (void);

union tree_node;

typedef union tree_node *tree;

enum tree_code

{

  LAST_AND_UNUSED_TREE_CODE

};

extern const char tree_code_type[];

struct tree_common

{

  enum tree_code code:8;

};

struct tree_type

{

  double alias_set;

};

union tree_node

{

  struct tree_common common;

  struct tree_type type;

};

long

foo (t, set)

     tree t;

     double set;

{

  if (tree_code_type[t->common.code] != 't')

    abort ();

  t->type.alias_set = set;

  if (t->common.code == 42)

    return 1;

  else

    return 0;

}

/* There should be precisely one load of common.code.  If there is

   more than one, then the dominator optimizations failed.  */

/* ??? Will fail until we properly distinguish member stores.  At

   present the write to type.alias_set kills the previous load.  */

/* { dg-final { scan-tree-dump-times "common.code" 1 "dom2" { xfail *-*-* } } } */

/* { dg-final { cleanup-tree-dump "dom2" } } */