tree-ssa-structalias.c (intra_create_variable_infos): Build representatives for…

tree-ssa-structalias.c (intra_create_variable_infos): Build representatives for all restrict qualified pointer destinations.

2015-09-23  Richard Biener  <rguenther@suse.de>

	* tree-ssa-structalias.c (intra_create_variable_infos): Build
	representatives for all restrict qualified pointer destinations.

	* g++.dg/tree-ssa/restrict2.C: Un-XFAIL testcase.

From-SVN: r228040

gcc/ChangeLog

+2015-09-23  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-structalias.c (intra_create_variable_infos): Build
+	representatives for all restrict qualified pointer destinations.
+
 2015-09-23  Kirill Yukhin  <kirill.yukhin@intel.com>
 
 	* config/i386/i386.md (define_code_attr mshift): New.

gcc/testsuite/ChangeLog

+2015-09-23  Richard Biener  <rguenther@suse.de>
+
+	* g++.dg/tree-ssa/restrict2.C: Un-XFAIL testcase.
+
 2015-09-22  Patrick Palka  <ppalka@gcc.gnu.org>
 
 	* c-c++-common/Wmisleading-indentation.c: Augment test.

gcc/testsuite/g++.dg/tree-ssa/restrict2.C

@@ -45,8 +45,7 @@ f5 (S *__restrict x, S *__restrict y)
 {
   x->p[0] = 5;
   y->p[0] = 0;
-// We might handle this some day
-// { dg-final { scan-tree-dump-times "return 5" 1 "optimized" { xfail *-*-* } } }
+// { dg-final { scan-tree-dump-times "return 5" 1 "optimized" } }
   return x->p[0];
 }
 

gcc/tree-ssa-structalias.c

@@ -5857,12 +5857,12 @@ intra_create_variable_infos (struct function *fn)
     {
       varinfo_t p = get_vi_for_tree (t);
 
-      /* For restrict qualified pointers to objects passed by
-         reference build a real representative for the pointed-to object.
-	 Treat restrict qualified references the same.  */
-      if (TYPE_RESTRICT (TREE_TYPE (t))
-	  && ((DECL_BY_REFERENCE (t) && POINTER_TYPE_P (TREE_TYPE (t)))
-	      || TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE)
+      /* For restrict qualified pointers build a representative for
+	 the pointed-to object.  Note that this ends up handling
+	 out-of-bound references conservatively by aggregating them
+	 in the first/last subfield of the object.  */
+      if (POINTER_TYPE_P (TREE_TYPE (t))
+	  && TYPE_RESTRICT (TREE_TYPE (t))
 	  && !type_contains_placeholder_p (TREE_TYPE (TREE_TYPE (t))))
 	{
 	  struct constraint_expr lhsc, rhsc;