diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 523dd67836d9..eb6d38c6ade1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-04  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* tree-vect-loop.c (vectorizable_reduction): Check reduction cost
+	before setting STMT_VINFO_TYPE.
+
 2011-05-04  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* config/spu/spu.c (spu_gimplify_va_arg_expr): Call pass_by_reference
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index e05c324d0b94..8f3b8e61c642 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -4317,9 +4317,9 @@ vectorizable_reduction (gimple stmt, gimple_stmt_iterator *gsi,
 
   if (!vec_stmt) /* transformation not required.  */
     {
-      STMT_VINFO_TYPE (stmt_info) = reduc_vec_info_type;
       if (!vect_model_reduction_cost (stmt_info, epilog_reduc_code, ncopies))
         return false;
+      STMT_VINFO_TYPE (stmt_info) = reduc_vec_info_type;
       return true;
     }