alias.c (record_component_aliases): Do not simplify pointed-to types of ODR types

	* alias.c (record_component_aliases): Do not simplify pointed-to
	types of ODR types 
	* testsuite/g++.dg/lto/alias-4_0.C

From-SVN: r273552

gcc/ChangeLog

+2019-07-17  Jan Hubicka  <hubicka@ucw.cz>
+
+	* alias.c (record_component_aliases): Do not simplify pointed-to
+	types of ODR types 
+
 2019-07-17  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*andqi_2_maybe_si): Handle potential

gcc/alias.c

@@ -1202,47 +1202,52 @@ record_component_aliases (tree type)
     case RECORD_TYPE:
     case UNION_TYPE:
     case QUAL_UNION_TYPE:
-      for (field = TYPE_FIELDS (type); field != 0; field = DECL_CHAIN (field))
-	if (TREE_CODE (field) == FIELD_DECL && !DECL_NONADDRESSABLE_P (field))
-	  {
-	    /* LTO type merging does not make any difference between 
-	       component pointer types.  We may have
-
-	       struct foo {int *a;};
-
-	       as TYPE_CANONICAL of 
-
-	       struct bar {float *a;};
-
-	       Because accesses to int * and float * do not alias, we would get
-	       false negative when accessing the same memory location by
-	       float ** and bar *. We thus record the canonical type as:
-
-	       struct {void *a;};
-
-	       void * is special cased and works as a universal pointer type.
-	       Accesses to it conflicts with accesses to any other pointer
-	       type.  */
-	    tree t = TREE_TYPE (field);
-	    if (in_lto_p)
-	      {
-		/* VECTOR_TYPE and ARRAY_TYPE share the alias set with their
-		   element type and that type has to be normalized to void *,
-		   too, in the case it is a pointer. */
-		while (!canonical_type_used_p (t) && !POINTER_TYPE_P (t))
-		  {
-		    gcc_checking_assert (TYPE_STRUCTURAL_EQUALITY_P (t));
-		    t = TREE_TYPE (t);
-		  }
-		if (POINTER_TYPE_P (t))
-		  t = ptr_type_node;
-		else if (flag_checking)
-		  gcc_checking_assert (get_alias_set (t)
-				       == get_alias_set (TREE_TYPE (field)));
-	      }
-
-	    record_alias_subset (superset, get_alias_set (t));
-	  }
+      {
+	/* LTO non-ODR type merging does not make any difference between 
+	   component pointer types.  We may have
+
+	   struct foo {int *a;};
+
+	   as TYPE_CANONICAL of 
+
+	   struct bar {float *a;};
+
+	   Because accesses to int * and float * do not alias, we would get
+	   false negative when accessing the same memory location by
+	   float ** and bar *. We thus record the canonical type as:
+
+	   struct {void *a;};
+
+	   void * is special cased and works as a universal pointer type.
+	   Accesses to it conflicts with accesses to any other pointer
+	   type.  */
+	bool void_pointers = in_lto_p
+			     && (!odr_type_p (type)
+				 || !odr_based_tbaa_p (type));
+	for (field = TYPE_FIELDS (type); field != 0; field = DECL_CHAIN (field))
+	  if (TREE_CODE (field) == FIELD_DECL && !DECL_NONADDRESSABLE_P (field))
+	    {
+	      tree t = TREE_TYPE (field);
+	      if (void_pointers)
+		{
+		  /* VECTOR_TYPE and ARRAY_TYPE share the alias set with their
+		     element type and that type has to be normalized to void *,
+		     too, in the case it is a pointer. */
+		  while (!canonical_type_used_p (t) && !POINTER_TYPE_P (t))
+		    {
+		      gcc_checking_assert (TYPE_STRUCTURAL_EQUALITY_P (t));
+		      t = TREE_TYPE (t);
+		    }
+		  if (POINTER_TYPE_P (t))
+		    t = ptr_type_node;
+		  else if (flag_checking)
+		    gcc_checking_assert (get_alias_set (t)
+					 == get_alias_set (TREE_TYPE (field)));
+		}
+
+	      record_alias_subset (superset, get_alias_set (t));
+	    }
+      }
       break;
 
     case COMPLEX_TYPE:

gcc/testsuite/ChangeLog

+2019-07-17  Jan Hubicka  <hubicka@ucw.cz>
+
+	* g++.dg/lto/alias-4_0.C
+
 2019-07-17  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/91178

gcc/testsuite/g++.dg/lto/alias-4_0.C

+/* { dg-lto-do run } */
+/* { dg-lto-options { { -O3 -flto -fno-early-inlining } } } */
+__attribute__ ((used))
+short *ptr_init, **ptr=&ptr_init;
+
+__attribute__ ((used))
+struct a {
+  int *aptr;
+} a, *aptr=&a;
+
+void
+write_ptr ()
+{
+  *aptr = a;
+}
+
+__attribute__ ((used))
+void
+test ()
+{
+  *ptr = (short int *)0;
+  write_ptr ();
+  if (!__builtin_constant_p (*ptr == (void *)0))
+    __builtin_abort ();
+}
+int
+main()
+{
+  test ();
+  return 0;
+}