diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5b7a188e11f..0b6a15ba0d8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-03-07  Zdenek Dvorak  <ook@ucw.cz>
+
+	PR bootstrap/48000
+	* cfgloopmanip.c (fix_bb_placements): Return immediately
+	if FROM is BASE_LOOP's header.
+
 2011-03-07  Paul Wögerer  <paul_woegerer@mentor.com>
 
 	* gimplify.c (gimplify_function_tree): Fix building calls
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c
index 3802f9cff12..1824421f616 100644
--- a/gcc/cfgloopmanip.c
+++ b/gcc/cfgloopmanip.c
@@ -185,7 +185,11 @@ fix_bb_placements (basic_block from,
      fix_loop_placement.  */
 
   base_loop = from->loop_father;
-  if (base_loop == current_loops->tree_root)
+  /* If we are already in the outermost loop, the basic blocks cannot be moved
+     outside of it.  If FROM is the header of the base loop, it cannot be moved
+     outside of it, either.  In both cases, we can end now.  */
+  if (base_loop == current_loops->tree_root
+      || from == base_loop->header)
     return;
 
   in_queue = sbitmap_alloc (last_basic_block);