--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr67043.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,32 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -fcompare-debug -w" } */
+
+extern void rt_mutex_owner (void);
+extern void rt_mutex_deadlock_account_lock (int);
+extern void signal_pending (void);
+__typeof__ (int *) a;
+int b;
+
+int
+try_to_take_rt_mutex (int p1) {
+  rt_mutex_owner ();
+  if (b)
+    return 0;
+  rt_mutex_deadlock_account_lock (p1);
+  return 1;
+}
+
+void
+__rt_mutex_slowlock (int p1) {
+  int c;
+  for (;;) {
+    c = ({
+      asm ("" : "=r"(a));
+      a;
+    });
+    if (try_to_take_rt_mutex (c))
+      break;
+    if (__builtin_expect (p1 == 0, 0))
+      signal_pending ();
+  }
+}