+ tree elements = NULL_TREE;
+
+ if (TREE_CODE (arg0) == VECTOR_CST)
+ elements = TREE_VECTOR_CST_ELTS (arg0);
+ else
+ {
+ unsigned HOST_WIDE_INT idx;
+ tree value;
+
+ FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (arg0), idx, value)
+ elements = tree_cons (NULL_TREE, value, elements);
+ }