re PR sanitizer/70712 (False positive from AddressSanitizer with use of 'alignas')

	PR sanitizer/70712
	* cfgexpand.c (expand_stack_vars): Fix typo.

	* c-c++-common/asan/pr70712.c: New test.

From-SVN: r235384

gcc/ChangeLog

+2016-04-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/70712
+	* cfgexpand.c (expand_stack_vars): Fix typo.
+
 2016-04-22  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	* system.h (list, map, set, vector): Include conditionally.

gcc/cfgexpand.c

@@ -1137,7 +1137,7 @@ expand_stack_vars (bool (*pred) (size_t), struct stack_vars_data *data)
 	      HOST_WIDE_INT prev_offset
 		= align_base (frame_offset,
 			      MAX (alignb, ASAN_RED_ZONE_SIZE),
-			      FRAME_GROWS_DOWNWARD);
+			      !FRAME_GROWS_DOWNWARD);
 	      tree repr_decl = NULL_TREE;
 	      offset
 		= alloc_stack_frame_space (stack_vars[i].size

gcc/testsuite/ChangeLog

+2016-04-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/70712
+	* c-c++-common/asan/pr70712.c: New test.
+
 2016-04-22  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
 	* .gitattributes: New file.

gcc/testsuite/c-c++-common/asan/pr70712.c

+/* PR sanitizer/70712 */
+/* { dg-do run } */
+
+struct __attribute__((aligned (64))) S
+{
+  char s[4];
+};
+
+struct T
+{
+  char t[8];
+  char u[480];
+
+};
+
+__attribute__((noinline, noclone)) void
+foo (struct T *p, struct S *q)
+{
+  __builtin_memset (p->t, '\0', sizeof (p->t));
+  __builtin_memset (p->u, '\0', sizeof (p->u));
+  __builtin_memset (q->s, '\0', sizeof (q->s));
+}
+
+int
+main ()
+{
+  struct S s;
+  struct T t;
+  foo (&t, &s);
+  asm volatile ("" : : "r" (&t), "r" (&s) : "memory");
+  return 0;
+}