From: Jan Hubicka <jh@suse.cz>
Date: Fri, 30 Oct 2020 13:28:23 +0000 (+0100)
Subject: Disable TBAA for array descriptors.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=40cb3f8ac875c6cf6610a5f93da571cfdd2a1513;p=gcc.git

Disable TBAA for array descriptors.

	* trans-types.c: Include alias.h
	(gfc_get_array_type_bounds): Set typeless storage.
---

diff --git a/gcc/fortran/trans-types.c b/gcc/fortran/trans-types.c
index b15ea667411..b7129dcbe6d 100644
--- a/gcc/fortran/trans-types.c
+++ b/gcc/fortran/trans-types.c
@@ -38,6 +38,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "trans-array.h"
 #include "dwarf2out.h"	/* For struct array_descr_info.  */
 #include "attribs.h"
+#include "alias.h"
 
 
 #if (GFC_MAX_DIMENSIONS < 10)
@@ -1903,6 +1904,10 @@ gfc_get_array_type_bounds (tree etype, int dimen, int codimen, tree * lbound,
   base_type = gfc_get_array_descriptor_base (dimen, codimen, false);
   TYPE_CANONICAL (fat_type) = base_type;
   TYPE_STUB_DECL (fat_type) = TYPE_STUB_DECL (base_type);
+  /* Arrays of unknown type must alias with all array descriptors.  */
+  TYPE_TYPELESS_STORAGE (base_type) = 1;
+  TYPE_TYPELESS_STORAGE (fat_type) = 1;
+  gcc_checking_assert (!get_alias_set (base_type) && !get_alias_set (fat_type));
 
   tmp = TYPE_NAME (etype);
   if (tmp && TREE_CODE (tmp) == TYPE_DECL)