re PR target/57796 (AVX2 gather vectorization: code bloat and reduction of performance)

2017-04-20  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/57796
	* tree-vect-stmts.c (vect_model_store_cost): Cost scatters
	as N scalar stores.
	(vect_model_load_cost): Cost gathers as N scalar loads.

From-SVN: r247026

gcc/ChangeLog

 2017-04-20  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/57796
+	* tree-vect-stmts.c (vect_model_store_cost): Cost scatters
+	as N scalar stores.
+	(vect_model_load_cost): Cost gathers as N scalar loads.
+
+2017-04-20  Richard Biener  <rguenther@suse.de>
+
 	* ggc-page.c (ggc_allocated_p): Rename to ...
 	(safe_lookup_page_table_entry): ... this and return the lookup
 	result.

gcc/tree-vect-stmts.c

@@ -929,7 +929,8 @@ vect_model_store_cost (stmt_vec_info stmt_info, int ncopies,
 
   tree vectype = STMT_VINFO_VECTYPE (stmt_info);
   /* Costs of the stores.  */
-  if (memory_access_type == VMAT_ELEMENTWISE)
+  if (memory_access_type == VMAT_ELEMENTWISE
+      || memory_access_type == VMAT_GATHER_SCATTER)
     /* N scalar stores plus extracting the elements.  */
     inside_cost += record_stmt_cost (body_cost_vec,
 				     ncopies * TYPE_VECTOR_SUBPARTS (vectype),
@@ -1056,7 +1057,8 @@ vect_model_load_cost (stmt_vec_info stmt_info, int ncopies,
     }
 
   /* The loads themselves.  */
-  if (memory_access_type == VMAT_ELEMENTWISE)
+  if (memory_access_type == VMAT_ELEMENTWISE
+      || memory_access_type == VMAT_GATHER_SCATTER)
     {
       /* N scalar loads plus gathering them into a vector.  */
       tree vectype = STMT_VINFO_VECTYPE (stmt_info);