[22/46] Make DR_GROUP_SAME_DR_STMT a stmt_vec_info

This patch changes STMT_VINFO_SAME_DR_STMT from a gimple stmt to a
stmt_vec_info.

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

gcc/
	* tree-vectorizer.h (_stmt_vec_info::same_dr_stmt): Change from
	a gimple stmt to a stmt_vec_info.
	* tree-vect-stmts.c (vectorizable_load): Update accordingly.

From-SVN: r263137

gcc/ChangeLog

 2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* tree-vectorizer.h (_stmt_vec_info::same_dr_stmt): Change from
+	a gimple stmt to a stmt_vec_info.
+	* tree-vect-stmts.c (vectorizable_load): Update accordingly.
+
+2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* tree-vectorizer.h (vec_info::grouped_stores): Change from
 	an auto_vec<gimple *> to an auto_vec<stmt_vec_info>.
 	(_loop_vec_info::reduction_chains): Likewise.

gcc/tree-vect-stmts.c

@@ -7590,8 +7590,7 @@ vectorizable_load (gimple *stmt, gimple_stmt_iterator *gsi,
 	 we have to give up.  */
       if (DR_GROUP_SAME_DR_STMT (stmt_info)
 	  && (STMT_SLP_TYPE (stmt_info)
-	      != STMT_SLP_TYPE (vinfo_for_stmt
-				 (DR_GROUP_SAME_DR_STMT (stmt_info)))))
+	      != STMT_SLP_TYPE (DR_GROUP_SAME_DR_STMT (stmt_info))))
 	{
 	  if (dump_enabled_p ())
 	    dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,

gcc/tree-vectorizer.h

@@ -876,7 +876,7 @@ struct _stmt_vec_info {
   stmt_vec_info next_element;
   /* For data-refs, in case that two or more stmts share data-ref, this is the
      pointer to the previously detected stmt with the same dr.  */
-  gimple *same_dr_stmt;
+  stmt_vec_info same_dr_stmt;
   /* The size of the group.  */
   unsigned int size;
   /* For stores, number of stores from this group seen. We vectorize the last