dwarf2out.c (add_pubname): Add comment.

2012-06-29  Sterling Augustine  <saugustine@google.com>

	* dwarf2out.c (add_pubname): Add comment.
	(add_pubtype): Fix indentation.
	(gen_enumeration_type_die): Likewise.

From-SVN: r189084

gcc/ChangeLog

+2012-06-29  Sterling Augustine  <saugustine@google.com>
+
+	* dwarf2out.c (add_pubname): Add comment.
+	(add_pubtype): Fix indentation.
+	(gen_enumeration_type_die): Likewise.
+
 2012-06-29  Jakub Jelinek  <jakub@redhat.com>
 
 	* tree-vect-generic.c (expand_vector_divmod): For even/odd

gcc/dwarf2out.c

@@ -8168,6 +8168,11 @@ add_pubname (tree decl, dw_die_ref die)
   if (!want_pubnames ())
     return;
 
+  /* Don't add items to the table when we expect that the consumer will have
+     just read the enclosing die.  For example, if the consumer is looking at a
+     class_member, it will either be inside the class already, or will have just
+     looked up the class to find the member.  Either way, searching the class is
+     faster than searching the index.  */
   if ((TREE_PUBLIC (decl) && !is_class_die (die->die_parent))
       || is_cu_die (die->die_parent) || is_namespace_die (die->die_parent))
     {