diff --git a/gcc/gimple-ssa-strength-reduction.c b/gcc/gimple-ssa-strength-reduction.c
index fea5741..7585164 100644
--- a/gcc/gimple-ssa-strength-reduction.c
+++ b/gcc/gimple-ssa-strength-reduction.c
@@ -769,7 +769,14 @@ backtrace_base_for_ref (tree *pbase)
 
   STRIP_NOPS (base_in);
   if (TREE_CODE (base_in) != SSA_NAME)
-    return tree_to_double_int (integer_zero_node);
+    {
+      /* Strip of widening conversion(s) to handle cases where
+	 e.g. 'B' is widened from an 'int' in order to calculate
+	 a 64-bit address.  */
+      base_in = get_unwidened (base_in, NULL_TREE);
+      if (TREE_CODE (base_in) != SSA_NAME)
+	return tree_to_double_int (integer_zero_node);
+    }
 
   base_cand = base_cand_from_table (base_in);