[vect] Refactor versioning threshold

gcc/ChangeLog:
2019-10-17  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* tree-vect-loop.c (vect_transform_loop): Move code from here...
	* tree-vect-loop-manip.c (vect_loop_versioning): ... to here.
	* tree-vectorizer.h (vect_loop_versioning): Remove unused parameters.

From-SVN: r277101

gcc/ChangeLog

+2019-10-17  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
+	* tree-vect-loop.c (vect_transform_loop): Move code from here...
+	* tree-vect-loop-manip.c (vect_loop_versioning): ... to here.
+	* tree-vectorizer.h (vect_loop_versioning): Remove unused parameters.
+
 2019-10-17  Richard Biener  <rguenther@suse.de>
 
 	* tree-vect-loop.c (needs_fold_left_reduction_p): Export.

gcc/tree-vect-loop-manip.c

@@ -2966,9 +2966,7 @@ vect_create_cond_for_alias_checks (loop_vec_info loop_vinfo, tree * cond_expr)
    *COND_EXPR_STMT_LIST.  */
 
 class loop *
-vect_loop_versioning (loop_vec_info loop_vinfo,
-		      unsigned int th, bool check_profitability,
-		      poly_uint64 versioning_threshold)
+vect_loop_versioning (loop_vec_info loop_vinfo)
 {
   class loop *loop = LOOP_VINFO_LOOP (loop_vinfo), *nloop;
   class loop *scalar_loop = LOOP_VINFO_SCALAR_LOOP (loop_vinfo);
@@ -2988,10 +2986,15 @@ vect_loop_versioning (loop_vec_info loop_vinfo,
   bool version_align = LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo);
   bool version_alias = LOOP_REQUIRES_VERSIONING_FOR_ALIAS (loop_vinfo);
   bool version_niter = LOOP_REQUIRES_VERSIONING_FOR_NITERS (loop_vinfo);
+  poly_uint64 versioning_threshold
+    = LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo);
   tree version_simd_if_cond
     = LOOP_REQUIRES_VERSIONING_FOR_SIMD_IF_COND (loop_vinfo);
+  unsigned th = LOOP_VINFO_COST_MODEL_THRESHOLD (loop_vinfo);
 
-  if (check_profitability)
+  if (th >= vect_vf_for_cost (loop_vinfo)
+      && !LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo)
+      && !ordered_p (th, versioning_threshold))
     cond_expr = fold_build2 (GE_EXPR, boolean_type_node, scalar_loop_iters,
 			     build_int_cst (TREE_TYPE (scalar_loop_iters),
 					    th - 1));

gcc/tree-vect-loop.c

@@ -8083,18 +8083,8 @@ vect_transform_loop (loop_vec_info loop_vinfo)
 
   if (LOOP_REQUIRES_VERSIONING (loop_vinfo))
     {
-      poly_uint64 versioning_threshold
-	= LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo);
-      if (check_profitability
-	  && ordered_p (poly_uint64 (th), versioning_threshold))
-	{
-	  versioning_threshold = ordered_max (poly_uint64 (th),
-					      versioning_threshold);
-	  check_profitability = false;
-	}
       class loop *sloop
-	= vect_loop_versioning (loop_vinfo, th, check_profitability,
-				versioning_threshold);
+	= vect_loop_versioning (loop_vinfo);
       sloop->force_vectorize = false;
       check_profitability = false;
     }

gcc/tree-vectorizer.h

@@ -1514,8 +1514,7 @@ extern void vect_set_loop_condition (class loop *, loop_vec_info,
 extern bool slpeel_can_duplicate_loop_p (const class loop *, const_edge);
 class loop *slpeel_tree_duplicate_loop_to_edge_cfg (class loop *,
 						     class loop *, edge);
-class loop *vect_loop_versioning (loop_vec_info, unsigned int, bool,
-				   poly_uint64);
+class loop *vect_loop_versioning (loop_vec_info);
 extern class loop *vect_do_peeling (loop_vec_info, tree, tree,
 				     tree *, tree *, tree *, int, bool, bool);
 extern void vect_prepare_for_masked_peels (loop_vec_info);