targhooks.c (default_builtin_vectorization_cost): Adjust vec_construct cost.

2016-06-10  Richard Biener  <rguenther@suse.de>

	* targhooks.c (default_builtin_vectorization_cost): Adjust
	vec_construct cost.

From-SVN: r237302

gcc/ChangeLog

 2016-06-10  Richard Biener  <rguenther@suse.de>
 
+	* targhooks.c (default_builtin_vectorization_cost): Adjust
+	vec_construct cost.
+
+2016-06-10  Richard Biener  <rguenther@suse.de>
+
 	* gimple-fold.c (gimple_fold_builtin_memory_op): Make sure
 	to fold the RHS to a constant if possible.
 

gcc/targhooks.c

@@ -564,8 +564,6 @@ default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
                                     tree vectype,
                                     int misalign ATTRIBUTE_UNUSED)
 {
-  unsigned elements;
-
   switch (type_of_cost)
     {
       case scalar_stmt:
@@ -589,8 +587,7 @@ default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
         return 3;
 
       case vec_construct:
-	elements = TYPE_VECTOR_SUBPARTS (vectype);
-	return elements / 2 + 1;
+	return TYPE_VECTOR_SUBPARTS (vectype) - 1;
 
       default:
         gcc_unreachable ();