tree-ssa-structalias.c (intra_create_variable_infos): Treat TYPE_RESTRICT…

tree-ssa-structalias.c (intra_create_variable_infos): Treat TYPE_RESTRICT REFERENCE_TYPE parameters like restricted DECL_BY_REFERENCE...

	* tree-ssa-structalias.c (intra_create_variable_infos): Treat
	TYPE_RESTRICT REFERENCE_TYPE parameters like restricted
	DECL_BY_REFERENCE parameters.

	* g++.dg/tree-ssa/restrict2.C: New test.

From-SVN: r179166

gcc/ChangeLog

+2011-09-25  Jakub Jelinek  <jakub@redhat.com>
+
+	* tree-ssa-structalias.c (intra_create_variable_infos): Treat
+	TYPE_RESTRICT REFERENCE_TYPE parameters like restricted
+	DECL_BY_REFERENCE parameters.
+
 2011-09-25  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* tree-eh.c (cleanup_empty_eh): Allow a call to __builtin_stack_restore

gcc/testsuite/ChangeLog

+2011-09-25  Jakub Jelinek  <jakub@redhat.com>
+
+	* g++.dg/tree-ssa/restrict2.C: New test.
+
 2011-09-25  Ira Rosen  <ira.rosen@linaro.org>
 
 	* lib/target-supports.exp (check_effective_target_vect64): New.

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

+// { dg-do compile }
+// { dg-options "-O2 -fdump-tree-optimized" }
+
+struct S { int *__restrict p; int q; };
+S s;
+
+int
+f1 (S x, S y)
+{
+  x.p[0] = 1;
+  y.p[0] = 0;
+// { dg-final { scan-tree-dump-times "return 1" 1 "optimized" } }
+  return x.p[0];
+}
+
+int
+f2 (S x)
+{
+  x.p[0] = 2;
+  s.p[0] = 0;
+// { dg-final { scan-tree-dump-times "return 2" 1 "optimized" } }
+  return x.p[0];
+}
+
+int
+f3 (S &__restrict x, S &__restrict y)
+{
+  x.p[0] = 3;
+  y.p[0] = 0;
+// { dg-final { scan-tree-dump-times "return 3" 1 "optimized" } }
+  return x.p[0];
+}
+
+int
+f4 (S &x, S &y)
+{
+  x.p[0] = 4;
+  y.p[0] = 0;
+// { dg-final { scan-tree-dump-times "return 4" 0 "optimized" } }
+  return x.p[0];
+}
+
+int
+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 *-*-* } } }
+  return x->p[0];
+}
+
+int
+f6 (S *x, S *y)
+{
+  x->p[0] = 6;
+  y->p[0] = 0;
+// { dg-final { scan-tree-dump-times "return 6" 0 "optimized" } }
+  return x->p[0];
+}
+
+// { dg-final { cleanup-tree-dump "optimized" } }

gcc/tree-ssa-structalias.c

@@ -5589,10 +5589,11 @@ intra_create_variable_infos (void)
       varinfo_t p;
 
       /* For restrict qualified pointers to objects passed by
-         reference build a real representative for the pointed-to object.  */
-      if (DECL_BY_REFERENCE (t)
-	  && POINTER_TYPE_P (TREE_TYPE (t))
-	  && TYPE_RESTRICT (TREE_TYPE (t)))
+         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))
 	{
 	  struct constraint_expr lhsc, rhsc;
 	  varinfo_t vi;