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Date: Thu, 13 Jun 2019 20:55:00 -0000
From: Jan Hubicka <hubicka@ucw.cz>
To: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Cc: Christophe Lyon <christophe.lyon@linaro.org>,	Richard Biener <rguenther@suse.de>,	gcc Patches <gcc-patches@gcc.gnu.org>, d@dcepelik.cz
Subject: Re: indirect_ref_may_alias_decl_p fix
Message-ID: <20190613205512.kkpsc6oicmoeovmt@kam.mff.cuni.cz>
References: <20190613120550.7wtzpieeszazjn7i@kam.mff.cuni.cz> <alpine.LSU.2.20.1906131408280.10704@zhemvz.fhfr.qr> <20190613122928.arp65f726mbnsxyz@kam.mff.cuni.cz> <CAKdteOb02LbSgttTRye8v4SuDvxi45Wu7SsmQ0EFyy2qzLf66g@mail.gmail.com> <yddv9x9xm25.fsf@CeBiTec.Uni-Bielefeld.DE>
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Hi,
actually since Rainer's testcase has TARGET_MEM_REF I think the problem
may be due to fact that we now can get TARGET_MEM_REF ofsetting the
array housed in decl while previously we gave up on types mismatch.
Does the following help?

Index: tree-ssa-alias.c
===================================================================
--- tree-ssa-alias.c	(revision 272265)
+++ tree-ssa-alias.c	(working copy)
@@ -1393,8 +1393,10 @@
      But avoid treating variable length arrays as "objects", instead assume they
      can overlap by an exact multiple of their element size.
      See gcc.dg/torture/alias-2.c.  */
-  if ((TREE_CODE (base1) != TARGET_MEM_REF
-       || (!TMR_INDEX (base1) && !TMR_INDEX2 (base1)))
+  if (((TREE_CODE (base1) != TARGET_MEM_REF
+        || (!TMR_INDEX (base1) && !TMR_INDEX2 (base1)))
+       && (TREE_CODE (dbase2) != TARGET_MEM_REF
+	   || (!TMR_INDEX (dbase2) && !TMR_INDEX2 (dbase2))))
       && same_type_for_tbaa (TREE_TYPE (base1), TREE_TYPE (dbase2)) == 1
       && (TREE_CODE (TREE_TYPE (base1)) != ARRAY_TYPE
 	  || (TYPE_SIZE (TREE_TYPE (base1))