diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index d2aab38c2d209d95c4aa8847a76863f12d0d3857..ce8ae8c675392e4cd632a4a30fffa5c2eb4d6018 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -5747,8 +5747,9 @@ visit_reference_op_load (tree lhs, tree op, gimple *stmt)
     {
       /* Avoid the type punning in case the result mode has padding where
 	 the op we lookup has not.  */
-      if (maybe_lt (GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (result))),
-		    GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (op)))))
+      if (TYPE_MODE (TREE_TYPE (result)) != BLKmode
+	  && maybe_lt (GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (result))),
+		       GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (op)))))
 	result = NULL_TREE;
       else
 	{