diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7181f961241..4724df2f7b7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-01-12  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/47259
+	* lto-streamer-out.c (output_gimple_stmt): Do not wrap
+	register variables in a MEM_REF.
+
 2011-01-12  Joseph Myers  <joseph@codesourcery.com>
 
 	* config.gcc (arm*-*-linux*, bfin*-uclinux*, bfin*-linux-uclibc*,
diff --git a/gcc/lto-streamer-out.c b/gcc/lto-streamer-out.c
index 7c0029334fd..e471d70bbcd 100644
--- a/gcc/lto-streamer-out.c
+++ b/gcc/lto-streamer-out.c
@@ -1769,7 +1769,8 @@ output_gimple_stmt (struct output_block *ob, gimple stmt)
 	      while (handled_component_p (*basep))
 		basep = &TREE_OPERAND (*basep, 0);
 	      if (TREE_CODE (*basep) == VAR_DECL
-		  && !auto_var_in_fn_p (*basep, current_function_decl))
+		  && !auto_var_in_fn_p (*basep, current_function_decl)
+		  && !DECL_REGISTER (*basep))
 		{
 		  bool volatilep = TREE_THIS_VOLATILE (*basep);
 		  *basep = build2 (MEM_REF, TREE_TYPE (*basep),