tree-ssa-alias.c (same_type_for_tbaa): Return ture if main variants are pointer equivalent.

	* tree-ssa-alias.c (same_type_for_tbaa): Return ture if main
	variants are pointer equivalent.

From-SVN: r271747

gcc/ChangeLog

+2019-05-29  Jan Hubicka  <jh@suse.cz>
+
+	* tree-ssa-alias.c (same_type_for_tbaa): Return ture if main
+	variants are pointer equivalent.
+
 2019-05-29  Alejandro Martinez  <alejandro.martinezvicente@arm.com>
 
 	* config/aarch64/aarch64-c.c: Added TARGET_SVE2.

gcc/tree-ssa-alias.c

@@ -787,6 +787,10 @@ same_type_for_tbaa (tree type1, tree type2)
   type1 = TYPE_MAIN_VARIANT (type1);
   type2 = TYPE_MAIN_VARIANT (type2);
 
+  /* Handle the most common case first.  */
+  if (type1 == type2)
+    return 1;
+
   /* If we would have to do structural comparison bail out.  */
   if (TYPE_STRUCTURAL_EQUALITY_P (type1)
       || TYPE_STRUCTURAL_EQUALITY_P (type2))