--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr85423.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,27 @@
+/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O2 -fselective-scheduling2 -fvar-tracking-assignments -fno-guess-branch-probability -fno-peephole2 -fno-ssa-phiopt -fno-tree-pre --param max-jump-thread-duplication-stmts=8 -w" } */
+/* { dg-additional-options "-march=nano" { target i?86-*-* x86_64-*-* } } */
+
+int vn, xm;
+
+void
+i1 (int);
+
+void
+mb (int *ap, int ev)
+{
+  while (vn < 1)
+    {
+      i1 (vn);
+
+      ev += *ap && ++vn;
+
+      while (xm < 1)
+        ++xm;
+
+      if (*ap == 0)
+        *ap = ev;
+
+      ++vn;
+    }
+}