--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr84799.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+int a, g;
+long b, f;
+short c, d, e;
+
+static void fn1 ()
+{
+  if (a)
+    {
+      long i = 5, j = b / i | c;
+      int k = b % (d % i) & j;
+      short l = ~f % (-d / j ^ -e), m = e << (d - l);
+      if (k)
+        m = d;
+      i = d | (i & b);
+      g = (c | ~f) % i + l;
+      e = (c - f) & e;
+      d = m;
+    }
+}
+
+int main ()
+{
+  b |= 1;
+  fn1 ();
+  return 0; 
+}