Do not disable aggressive loop opts for

	PR sanitizer/77966
	* opts.c (finish_options): Skip conditionally.
	PR sanitizer/77966
	* c-c++-common/ubsan/unreachable-3.c: New test.

From-SVN: r241463

gcc/ChangeLog

+2016-10-24  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/77966
+	* opts.c (finish_options): Skip conditionally.
+
 2016-10-23  Martin Sebor  <msebor@redhat.com>
 
 	PR target/77837

gcc/opts.c

@@ -973,7 +973,7 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
     opts->x_flag_delete_null_pointer_checks = 0;
 
   /* Aggressive compiler optimizations may cause false negatives.  */
-  if (opts->x_flag_sanitize)
+  if (opts->x_flag_sanitize & ~(SANITIZE_LEAK | SANITIZE_UNREACHABLE))
     {
       opts->x_flag_aggressive_loop_optimizations = 0;
       opts->x_flag_strict_overflow = 0;

gcc/testsuite/ChangeLog

+2016-10-24  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/77966
+	* c-c++-common/ubsan/unreachable-3.c: New test.
+
 2016-10-23  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/77763

gcc/testsuite/c-c++-common/ubsan/unreachable-3.c

+/* { dg-do compile } */
+/* { dg-options "-fsanitize=unreachable -O2 -fno-reorder-blocks -fsanitize-coverage=trace-pc -fdump-tree-optimized" } */
+/* { dg-skip-if "" { *-*-* } { "-flto" } } */
+
+extern unsigned int ioread32(void *);
+struct vnic_wq_ctrl {
+    unsigned int error_status;
+};
+struct snic {
+    unsigned int wq_count;
+    struct vnic_wq_ctrl *wq[1];
+    int wq_lock[1];
+};
+void snic_log_q_error(struct snic *snic)
+{
+    unsigned int i;
+    for (i = 0; i < snic->wq_count; i++)
+        ioread32(&snic->wq[i]->error_status);
+}
+
+/* { dg-final { scan-tree-dump "__builtin___ubsan_handle_builtin_unreachable" "optimized" } } */