stl_list.h (_List_base::_List_base(_List_base&&)): Optimize.

	* include/bits/stl_list.h (_List_base::_List_base(_List_base&&)):
	Optimize.
	* testsuite/23_containers/list/requirements/dr438/assign_neg.cc:
	Adjust dg-error line number.
	* testsuite/23_containers/list/requirements/dr438/constructor_1_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/constructor_2_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
	Likewise.

From-SVN: r213716

libstdc++-v3/ChangeLog

+2014-08-07  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/stl_list.h (_List_base::_List_base(_List_base&&)):
+	Optimize.
+	* testsuite/23_containers/list/requirements/dr438/assign_neg.cc:
+	Adjust dg-error line number.
+	* testsuite/23_containers/list/requirements/dr438/constructor_1_neg.cc:
+	Likewise.
+	* testsuite/23_containers/list/requirements/dr438/constructor_2_neg.cc:
+	Likewise.
+	* testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
+	Likewise.
+
 2014-08-02  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/15339

libstdc++-v3/include/bits/stl_list.h

@@ -377,8 +377,17 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       _List_base(_List_base&& __x) noexcept
       : _M_impl(std::move(__x._M_get_Node_allocator()))
       {
-	_M_init();
-	__detail::_List_node_base::swap(_M_impl._M_node, __x._M_impl._M_node);
+	auto* const __xnode = std::__addressof(__x._M_impl._M_node);
+	if (__xnode->_M_next == __xnode)
+	  _M_init();
+	else
+	  {
+	    auto* const __node = std::__addressof(_M_impl._M_node);
+	    __node->_M_next = __xnode->_M_next;
+	    __node->_M_prev = __xnode->_M_prev;
+	    __node->_M_next->_M_prev = __node->_M_prev->_M_next = __node;
+	    __xnode->_M_next = __xnode->_M_prev = __xnode;
+	  }
       }
 #endif
 

libstdc++-v3/testsuite/23_containers/list/requirements/dr438/assign_neg.cc

@@ -18,7 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do compile }
-// { dg-error "no matching" "" { target *-*-* } 1656 }
+// { dg-error "no matching" "" { target *-*-* } 1665 }
 
 #include <list>
 

libstdc++-v3/testsuite/23_containers/list/requirements/dr438/constructor_1_neg.cc

@@ -18,7 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do compile }
-// { dg-error "no matching" "" { target *-*-* } 1608 }
+// { dg-error "no matching" "" { target *-*-* } 1617 }
 
 #include <list>
 

libstdc++-v3/testsuite/23_containers/list/requirements/dr438/constructor_2_neg.cc

@@ -18,7 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do compile }
-// { dg-error "no matching" "" { target *-*-* } 1608 }
+// { dg-error "no matching" "" { target *-*-* } 1617 }
 
 #include <list>
 #include <utility>

libstdc++-v3/testsuite/23_containers/list/requirements/dr438/insert_neg.cc

@@ -18,7 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do compile }
-// { dg-error "no matching" "" { target *-*-* } 1608 }
+// { dg-error "no matching" "" { target *-*-* } 1617 }
 
 #include <list>