rs600.c (rs6000_builtin_vectorization_cost): Adjust unaligned load cost.

2016-12-13  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/rs600.c (rs6000_builtin_vectorization_cost):
	Adjust unaligned load cost.

From-SVN: r243623

gcc/ChangeLog

+2016-12-13  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	* config/rs6000/rs600.c (rs6000_builtin_vectorization_cost):
+	Adjust unaligned load cost.
+
 2016-12-13  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/78794

gcc/config/rs6000/rs6000.c

@@ -5358,6 +5358,9 @@ rs6000_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
         return 3;
 
       case unaligned_load:
+	if (TARGET_P9_VECTOR)
+	  return 3;
+
 	if (TARGET_EFFICIENT_UNALIGNED_VSX)
 	  return 1;