tree-vect-stmts.c (vectorizable_comparison): Swap operands only once.

	* tree-vect-stmts.c (vectorizable_comparison) <!slp_node>:
	Swap operands only once.

From-SVN: r273316

gcc/ChangeLog

+2019-07-09  Joern Rennecke  <joern.rennecke@riscy-ip.com>
+
+	* tree-vect-stmts.c (vectorizable_comparison) <!slp_node>:
+	Swap operands only once.
+
 2019-07-09  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>
 
 	* cfgcleanup.c (old_insns_match_p): Check if used hard regs set is equal

gcc/tree-vect-stmts.c

@@ -10369,7 +10369,7 @@ vectorizable_comparison (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
 
       if (!slp_node)
 	{
-	  if (swap_p)
+	  if (swap_p && j == 0)
 	    std::swap (vec_rhs1, vec_rhs2);
 	  vec_oprnds0.quick_push (vec_rhs1);
 	  vec_oprnds1.quick_push (vec_rhs2);