[25/46] Make get_earlier/later_stmt take and return stmt_vec_infos

...and also make vect_find_last_scalar_stmt_in_slp return a stmt_vec_info.

2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (get_earlier_stmt, get_later_stmt): Take and
	return stmt_vec_infos rather than gimple stmts.  Do not accept
	null arguments.
	(vect_find_last_scalar_stmt_in_slp): Return a stmt_vec_info instead
	of a gimple stmt.
	* tree-vect-slp.c (vect_find_last_scalar_stmt_in_slp): Likewise.
	Update use of get_later_stmt.
	(vect_get_constant_vectors): Update call accordingly.
	(vect_schedule_slp_instance): Likewise
	* tree-vect-data-refs.c (vect_slp_analyze_node_dependences): Likewise.
	(vect_slp_analyze_instance_dependence): Likewise.
	(vect_preserves_scalar_order_p): Update use of get_earlier_stmt.

From-SVN: r263140

gcc/ChangeLog

 2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* tree-vectorizer.h (get_earlier_stmt, get_later_stmt): Take and
+	return stmt_vec_infos rather than gimple stmts.  Do not accept
+	null arguments.
+	(vect_find_last_scalar_stmt_in_slp): Return a stmt_vec_info instead
+	of a gimple stmt.
+	* tree-vect-slp.c (vect_find_last_scalar_stmt_in_slp): Likewise.
+	Update use of get_later_stmt.
+	(vect_get_constant_vectors): Update call accordingly.
+	(vect_schedule_slp_instance): Likewise
+	* tree-vect-data-refs.c (vect_slp_analyze_node_dependences): Likewise.
+	(vect_slp_analyze_instance_dependence): Likewise.
+	(vect_preserves_scalar_order_p): Update use of get_earlier_stmt.
+
+2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* tree-vectorizer.h (stmt_info_for_cost::stmt): Replace with...
 	(stmt_info_for_cost::stmt_info): ...this new field.
 	(add_stmt_costs): Update accordingly.

gcc/tree-vect-data-refs.c

@@ -216,8 +216,8 @@ vect_preserves_scalar_order_p (gimple *stmt_a, gimple *stmt_b)
     stmtinfo_a = STMT_VINFO_RELATED_STMT (stmtinfo_a);
   if (is_pattern_stmt_p (stmtinfo_b))
     stmtinfo_b = STMT_VINFO_RELATED_STMT (stmtinfo_b);
-  gimple *earlier_stmt = get_earlier_stmt (stmtinfo_a, stmtinfo_b);
-  return !DR_IS_WRITE (STMT_VINFO_DATA_REF (vinfo_for_stmt (earlier_stmt)));
+  stmt_vec_info earlier_stmt_info = get_earlier_stmt (stmtinfo_a, stmtinfo_b);
+  return !DR_IS_WRITE (STMT_VINFO_DATA_REF (earlier_stmt_info));
 }
 
 /* A subroutine of vect_analyze_data_ref_dependence.  Handle
@@ -671,17 +671,17 @@ vect_slp_analyze_node_dependences (slp_instance instance, slp_tree node,
   /* This walks over all stmts involved in the SLP load/store done
      in NODE verifying we can sink them up to the last stmt in the
      group.  */
-  gimple *last_access = vect_find_last_scalar_stmt_in_slp (node);
+  stmt_vec_info last_access_info = vect_find_last_scalar_stmt_in_slp (node);
   for (unsigned k = 0; k < SLP_INSTANCE_GROUP_SIZE (instance); ++k)
     {
       stmt_vec_info access_info = SLP_TREE_SCALAR_STMTS (node)[k];
-      if (access_info == last_access)
+      if (access_info == last_access_info)
 	continue;
       data_reference *dr_a = STMT_VINFO_DATA_REF (access_info);
       ao_ref ref;
       bool ref_initialized_p = false;
       for (gimple_stmt_iterator gsi = gsi_for_stmt (access_info->stmt);
-	   gsi_stmt (gsi) != last_access; gsi_next (&gsi))
+	   gsi_stmt (gsi) != last_access_info->stmt; gsi_next (&gsi))
 	{
 	  gimple *stmt = gsi_stmt (gsi);
 	  if (! gimple_vuse (stmt)
@@ -757,14 +757,14 @@ vect_slp_analyze_instance_dependence (slp_instance instance)
     store = NULL;
 
   /* Verify we can sink stores to the vectorized stmt insert location.  */
-  gimple *last_store = NULL;
+  stmt_vec_info last_store_info = NULL;
   if (store)
     {
       if (! vect_slp_analyze_node_dependences (instance, store, vNULL, NULL))
 	return false;
 
       /* Mark stores in this instance and remember the last one.  */
-      last_store = vect_find_last_scalar_stmt_in_slp (store);
+      last_store_info = vect_find_last_scalar_stmt_in_slp (store);
       for (unsigned k = 0; k < SLP_INSTANCE_GROUP_SIZE (instance); ++k)
 	gimple_set_visited (SLP_TREE_SCALAR_STMTS (store)[k]->stmt, true);
     }
@@ -779,7 +779,7 @@ vect_slp_analyze_instance_dependence (slp_instance instance)
     if (! vect_slp_analyze_node_dependences (instance, load,
 					     store
 					     ? SLP_TREE_SCALAR_STMTS (store)
-					     : vNULL, last_store))
+					     : vNULL, last_store_info))
       {
 	res = false;
 	break;

gcc/tree-vect-slp.c

@@ -1838,18 +1838,17 @@ vect_supported_load_permutation_p (slp_instance slp_instn)
 
 /* Find the last store in SLP INSTANCE.  */
 
-gimple *
+stmt_vec_info
 vect_find_last_scalar_stmt_in_slp (slp_tree node)
 {
-  gimple *last = NULL;
+  stmt_vec_info last = NULL;
   stmt_vec_info stmt_vinfo;
 
   for (int i = 0; SLP_TREE_SCALAR_STMTS (node).iterate (i, &stmt_vinfo); i++)
     {
       if (is_pattern_stmt_p (stmt_vinfo))
-	last = get_later_stmt (STMT_VINFO_RELATED_STMT (stmt_vinfo), last);
-      else
-	last = get_later_stmt (stmt_vinfo, last);
+	stmt_vinfo = STMT_VINFO_RELATED_STMT (stmt_vinfo);
+      last = last ? get_later_stmt (stmt_vinfo, last) : stmt_vinfo;
     }
 
   return last;
@@ -3480,8 +3479,9 @@ vect_get_constant_vectors (tree op, slp_tree slp_node,
 	      gimple_stmt_iterator gsi;
 	      if (place_after_defs)
 		{
-		  gsi = gsi_for_stmt
-		          (vect_find_last_scalar_stmt_in_slp (slp_node));
+		  stmt_vec_info last_stmt_info
+		    = vect_find_last_scalar_stmt_in_slp (slp_node);
+		  gsi = gsi_for_stmt (last_stmt_info->stmt);
 		  init = vect_init_vector (stmt_vinfo, vec_cst, vector_type,
 					   &gsi);
 		}
@@ -3910,7 +3910,8 @@ vect_schedule_slp_instance (slp_tree node, slp_instance instance,
 
   /* Vectorized stmts go before the last scalar stmt which is where
      all uses are ready.  */
-  si = gsi_for_stmt (vect_find_last_scalar_stmt_in_slp (node));
+  stmt_vec_info last_stmt_info = vect_find_last_scalar_stmt_in_slp (node);
+  si = gsi_for_stmt (last_stmt_info->stmt);
 
   /* Mark the first element of the reduction chain as reduction to properly
      transform the node.  In the analysis phase only the last element of the

gcc/tree-vectorizer.h

@@ -1119,68 +1119,36 @@ set_vinfo_for_stmt (gimple *stmt, stmt_vec_info info)
     }
 }
 
-/* Return the earlier statement between STMT1 and STMT2.  */
+/* Return the earlier statement between STMT1_INFO and STMT2_INFO.  */
 
-static inline gimple *
-get_earlier_stmt (gimple *stmt1, gimple *stmt2)
+static inline stmt_vec_info
+get_earlier_stmt (stmt_vec_info stmt1_info, stmt_vec_info stmt2_info)
 {
-  unsigned int uid1, uid2;
-
-  if (stmt1 == NULL)
-    return stmt2;
-
-  if (stmt2 == NULL)
-    return stmt1;
-
-  uid1 = gimple_uid (stmt1);
-  uid2 = gimple_uid (stmt2);
-
-  if (uid1 == 0 || uid2 == 0)
-    return NULL;
-
-  gcc_assert (uid1 <= stmt_vec_info_vec->length ()
-	      && uid2 <= stmt_vec_info_vec->length ());
-  gcc_checking_assert ((STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (stmt1))
-			|| !STMT_VINFO_RELATED_STMT (vinfo_for_stmt (stmt1)))
-		       && (STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (stmt2))
-			   || !STMT_VINFO_RELATED_STMT (vinfo_for_stmt (stmt2))));
+  gcc_checking_assert ((STMT_VINFO_IN_PATTERN_P (stmt1_info)
+			|| !STMT_VINFO_RELATED_STMT (stmt1_info))
+		       && (STMT_VINFO_IN_PATTERN_P (stmt2_info)
+			   || !STMT_VINFO_RELATED_STMT (stmt2_info)));
 
-  if (uid1 < uid2)
-    return stmt1;
+  if (gimple_uid (stmt1_info->stmt) < gimple_uid (stmt2_info->stmt))
+    return stmt1_info;
   else
-    return stmt2;
+    return stmt2_info;
 }
 
-/* Return the later statement between STMT1 and STMT2.  */
+/* Return the later statement between STMT1_INFO and STMT2_INFO.  */
 
-static inline gimple *
-get_later_stmt (gimple *stmt1, gimple *stmt2)
+static inline stmt_vec_info
+get_later_stmt (stmt_vec_info stmt1_info, stmt_vec_info stmt2_info)
 {
-  unsigned int uid1, uid2;
-
-  if (stmt1 == NULL)
-    return stmt2;
-
-  if (stmt2 == NULL)
-    return stmt1;
-
-  uid1 = gimple_uid (stmt1);
-  uid2 = gimple_uid (stmt2);
-
-  if (uid1 == 0 || uid2 == 0)
-    return NULL;
-
-  gcc_assert (uid1 <= stmt_vec_info_vec->length ()
-	      && uid2 <= stmt_vec_info_vec->length ());
-  gcc_checking_assert ((STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (stmt1))
-			|| !STMT_VINFO_RELATED_STMT (vinfo_for_stmt (stmt1)))
-		       && (STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (stmt2))
-			   || !STMT_VINFO_RELATED_STMT (vinfo_for_stmt (stmt2))));
+  gcc_checking_assert ((STMT_VINFO_IN_PATTERN_P (stmt1_info)
+			|| !STMT_VINFO_RELATED_STMT (stmt1_info))
+		       && (STMT_VINFO_IN_PATTERN_P (stmt2_info)
+			   || !STMT_VINFO_RELATED_STMT (stmt2_info)));
 
-  if (uid1 > uid2)
-    return stmt1;
+  if (gimple_uid (stmt1_info->stmt) > gimple_uid (stmt2_info->stmt))
+    return stmt1_info;
   else
-    return stmt2;
+    return stmt2_info;
 }
 
 /* Return TRUE if a statement represented by STMT_INFO is a part of a
@@ -1674,7 +1642,7 @@ extern bool vect_make_slp_decision (loop_vec_info);
 extern void vect_detect_hybrid_slp (loop_vec_info);
 extern void vect_get_slp_defs (vec<tree> , slp_tree, vec<vec<tree> > *);
 extern bool vect_slp_bb (basic_block);
-extern gimple *vect_find_last_scalar_stmt_in_slp (slp_tree);
+extern stmt_vec_info vect_find_last_scalar_stmt_in_slp (slp_tree);
 extern bool is_simple_and_all_uses_invariant (gimple *, loop_vec_info);
 extern bool can_duplicate_and_interleave_p (unsigned int, machine_mode,
 					    unsigned int * = NULL,