re PR tree-optimization/68707 (testcase gcc.dg/vect/O3-pr36098.c vectorized…

re PR tree-optimization/68707 (testcase gcc.dg/vect/O3-pr36098.c vectorized using VEC_PERM_EXPR rather than VEC_LOAD_LANES)

2015-12-10  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/68707
	PR tree-optimization/67323
	* tree-vect-slp.c (vect_analyze_slp_instance): Drop SLP instances
	if they can be vectorized using load/store-lane instructions.

From-SVN: r231620

gcc/ChangeLog

 2015-12-14  Richard Biener  <rguenther@suse.de>
 
+	Revert accidentially applied
+	PR tree-optimization/68707
+	PR tree-optimization/67323
+	* tree-vect-slp.c (vect_analyze_slp_instance): Drop SLP instances
+	if they can be vectorized using load/store-lane instructions.
+
+2015-12-14  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/68852
 	* tree-vectorizer.h (struct _slp_tree): Add def_type member.
 	(SLP_TREE_DEF_TYPE): New accessor.

gcc/tree-vect-slp.c

@@ -1808,33 +1808,6 @@ vect_analyze_slp_instance (vec_info *vinfo,
             }
         }
 
-      /* If the loads and stores can be handled with load/store-lane
-         instructions do not generate this SLP instance.  */
-      if (is_a <loop_vec_info> (vinfo)
-	  && loads_permuted
-	  && dr && vect_store_lanes_supported (vectype, group_size))
-	{
-	  slp_tree load_node;
-	  FOR_EACH_VEC_ELT (loads, i, load_node)
-	    {
-	      gimple *first_stmt = GROUP_FIRST_ELEMENT
-		  (vinfo_for_stmt (SLP_TREE_SCALAR_STMTS (load_node)[0]));
-	      stmt_vec_info stmt_vinfo = vinfo_for_stmt (first_stmt);
-	      if (! vect_load_lanes_supported (STMT_VINFO_VECTYPE (stmt_vinfo),
-					       GROUP_SIZE (stmt_vinfo)))
-		break;
-	    }
-	  if (i == loads.length ())
-	    {
-	      if (dump_enabled_p ())
-		dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
-				 "Built SLP cancelled: can use "
-				 "load/store-lanes\n");
-              vect_free_slp_instance (new_instance);
-              return false;
-	    }
-	}
-
       vinfo->slp_instances.safe_push (new_instance);
 
       if (dump_enabled_p ())