ICF: Validate correctly hard register variables.

	* ipa-icf-gimple.c (func_checker::compare_variable_decl): Compare
	hard register variables.

From-SVN: r220985

gcc/ChangeLog

+2015-02-25  Martin Liska  <mliska@suse.cz>
+
+	* ipa-icf-gimple.c (func_checker::compare_variable_decl): Compare
+	hard register variables.
+
 2015-02-25  Kai Tietz  <ktietz@redhat.com>
 
 	PR target/64212

gcc/ipa-icf-gimple.c

@@ -575,6 +575,13 @@ func_checker::compare_variable_decl (tree t1, tree t2)
   if (t1 == t2)
     return true;
 
+  if (DECL_HARD_REGISTER (t1) != DECL_HARD_REGISTER (t2))
+    return return_false_with_msg ("DECL_HARD_REGISTER are different");
+
+  if (DECL_HARD_REGISTER (t1)
+      && DECL_ASSEMBLER_NAME (t1) != DECL_ASSEMBLER_NAME (t2))
+    return return_false_with_msg ("HARD REGISTERS are different");
+
   if (TREE_CODE (t1) == VAR_DECL && (DECL_EXTERNAL (t1) || TREE_STATIC (t1)))
     {
       symtab_node *n1 = symtab_node::get (t1);