re PR lto/47259 (LTO and global register variable)

2011-12-02  Richard Guenther  <rguenther@suse.de>

	PR lto/47259
	* ipa.c (varpool_externally_visible_p): Register variables
	are always externally visible.

From-SVN: r181927

gcc/ChangeLog

+2011-12-02  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/47259
+	* ipa.c (varpool_externally_visible_p): Register variables
+	are always externally visible.
+
 2011-12-02  Sameera Deshpande  <sameera.deshpande@arm.com>
 
 	* gimple-pretty-print.c (dump_gimple_call): Dereference fn only if

gcc/ipa.c

@@ -662,6 +662,8 @@ varpool_externally_visible_p (struct varpool_node *vnode, bool aliased)
   if (varpool_used_from_object_file_p (vnode))
     return true;
 
+  if (DECL_HARD_REGISTER (vnode->decl))
+    return true;
   if (DECL_PRESERVE_P (vnode->decl))
     return true;
   if (lookup_attribute ("externally_visible",