* tree.c (build1): Check for null operand in last change.

From-SVN: r39587

gcc/ChangeLog

 2001-02-11  Richard Henderson  <rth@redhat.com>
 
+	* tree.c (build1): Check for null operand in last change.
+
+2001-02-11  Richard Henderson  <rth@redhat.com>
+
 	* fold-const.c (split_tree): Don't assume a constant isn't splittable.
 	(fold): Don't assume a constant isn't foldable.
 	* tree.c (build): Set TREE_CONSTANT for an expression with no

gcc/tree.c

@@ -2482,7 +2482,7 @@ build1 (code, type, node)
       break;
 
     default:
-      if (TREE_CODE_CLASS (code) == '1' && TREE_CONSTANT (node))
+      if (TREE_CODE_CLASS (code) == '1' && node && TREE_CONSTANT (node))
 	TREE_CONSTANT (t) = 1;
       break;
     }