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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
{
  SET_TYPE,
  RECORD_TYPE,
  LAST_AND_UNUSED_TREE_CODE
};
extern const char tree_code_type[];
 
struct tree_common
{
 
  enum tree_code code:8;
};
 
 
 
 
 
union tree_node
{
  struct tree_common common;
};
 
readonly_fields_p (type)
     tree type;
{
 
  if (type->common.code != RECORD_TYPE)
    return;
 
  if (tree_code_type[type->common.code] != 't')
    abort ();
 
  return;
}
 
/* A good optimizer would realize that the cast to (unsigned int) is
   useless as the earlier cast of the same value of (unsigned char) will
   always produce the same result.  */
/* { dg-final { scan-tree-dump-times "\\(unsigned int\\)" 0 "dom2"} } */
 
/* There should be one load of ->common.code.  We currently fail this
   because we load from ->common.code using different types.  */
/* { dg-final { scan-tree-dump-times "common\.code" 1 "dom2"} } */
 
/* { dg-final { cleanup-tree-dump "dom2" } } */