re PR c++/66501 (Default move assignment does not move array members)

	PR c++/66501
	* class.c (type_has_nontrivial_assignment): Remove.
	* cp-tree.h: Remove declaration.
	* init.c (vec_copy_assign_is_trivial): New.
	(build_vec_init): Use it.

From-SVN: r224904

gcc/cp/ChangeLog

+2015-06-24  Jason Merrill  <jason@redhat.com>
+
+	PR c++/66501
+	* class.c (type_has_nontrivial_assignment): Remove.
+	* cp-tree.h: Remove declaration.
+	* init.c (vec_copy_assign_is_trivial): New.
+	(build_vec_init): Use it.
+
 2015-06-24  Edward Smith-Rowland  <3dw4rd@verizon.net>
 
 	Implement N3928 - Extending static_assert

gcc/cp/class.c

@@ -5136,24 +5136,6 @@ type_has_non_user_provided_default_constructor (tree t)
   return false;
 }
 
-/* Return true if TYPE has some non-trivial assignment operator.  */
-
-bool
-type_has_nontrivial_assignment (tree type)
-{
-  gcc_assert (TREE_CODE (type) != ARRAY_TYPE);
-  if (CLASS_TYPE_P (type))
-    for (tree fns
-	   = lookup_fnfields_slot_nolazy (type, ansi_assopname (NOP_EXPR));
-	 fns; fns = OVL_NEXT (fns))
-      {
-	tree fn = OVL_CURRENT (fns);
-	if (!trivial_fn_p (fn))
-	  return true;
-      }
-  return false;
-}
-
 /* TYPE is being used as a virtual base, and has a non-trivial move
    assignment.  Return true if this is due to there being a user-provided
    move assignment in TYPE or one of its subobjects; if there isn't, then

gcc/cp/cp-tree.h

@@ -5295,7 +5295,6 @@ extern tree in_class_defaulted_default_constructor (tree);
 extern bool user_provided_p			(tree);
 extern bool type_has_user_provided_constructor  (tree);
 extern bool type_has_non_user_provided_default_constructor (tree);
-extern bool type_has_nontrivial_assignment	(tree);
 extern bool vbase_has_user_provided_move_assign (tree);
 extern tree default_init_uninitialized_part (tree);
 extern bool trivial_default_constructor_is_constexpr (tree);

gcc/cp/init.c

@@ -3384,6 +3384,18 @@ get_temp_regvar (tree type, tree init)
   return decl;
 }
 
+/* Subroutine of build_vec_init.  Returns true if assigning to an array of
+   INNER_ELT_TYPE from INIT is trivial.  */
+
+static bool
+vec_copy_assign_is_trivial (tree inner_elt_type, tree init)
+{
+  tree fromtype = inner_elt_type;
+  if (real_lvalue_p (init))
+    fromtype = cp_build_reference_type (fromtype, /*rval*/false);
+  return is_trivially_xible (MODIFY_EXPR, inner_elt_type, fromtype);
+}
+
 /* `build_vec_init' returns tree structure that performs
    initialization of a vector of aggregate types.
 
@@ -3460,7 +3472,7 @@ build_vec_init (tree base, tree maxindex, tree init,
       && TREE_CODE (atype) == ARRAY_TYPE
       && TREE_CONSTANT (maxindex)
       && (from_array == 2
-	  ? !type_has_nontrivial_assignment (inner_elt_type)
+	  ? vec_copy_assign_is_trivial (inner_elt_type, init)
 	  : !TYPE_NEEDS_CONSTRUCTING (type))
       && ((TREE_CODE (init) == CONSTRUCTOR
 	   /* Don't do this if the CONSTRUCTOR might contain something