alias.c (compare_base_decls): Use symtab_node::get.

	gcc/
	* alias.c (compare_base_decls): Use symtab_node::get.

	gcc/testsuite/
	* gcc.dg/alias-15.c: New.

From-SVN: r232073

gcc/ChangeLog

+2016-01-05  Nathan Sidwell  <nathan@acm.org>
+
+	* alias.c (compare_base_decls): Use symtab_node::get.
+
 2016-01-05  Nick Clifton  <nickc@redhat.com>
 
 	PR target/68770

gcc/alias.c

@@ -2044,8 +2044,15 @@ compare_base_decls (tree base1, tree base2)
       || !decl_in_symtab_p (base2))
     return 0;
 
-  ret = symtab_node::get_create (base1)->equal_address_to
-		 (symtab_node::get_create (base2), true);
+  /* Don't cause symbols to be inserted by the act of checking.  */
+  symtab_node *node1 = symtab_node::get (base1);
+  if (!node1)
+    return 0;
+  symtab_node *node2 = symtab_node::get (base2);
+  if (!node2)
+    return 0;
+  
+  ret = node1->equal_address_to (node2, true);
   if (ret == 2)
     return -1;
   return ret;

gcc/testsuite/ChangeLog

+2016-01-05  Nathan Sidwell  <nathan@acm.org>
+
+	* gcc.dg/alias-15.c: New.
+
 2016-01-05  Nick Clifton  <nickc@redhat.com>
 
 	PR target/68870

gcc/testsuite/gcc.dg/alias-15.c

+/* { dg-do compile } */
+/* { dg-additional-options  "-O2 -fdump-ipa-cgraph" } */
+
+/* RTL-level CSE shouldn't introduce LCO (for the string) into varpool */
+char *p;
+
+void foo ()
+{
+  p = "abc\n";
+
+  while (*p != '\n')
+    p++;
+}
+
+/* { dg-final { scan-ipa-dump-not "LC0" "cgraph" } } */