--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr68730.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,51 @@
+/* PR rtl-optimization/68730 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -fno-if-conversion" } */
+/* { dg-additional-options "-march=x86-64" { target { i?86-*-* x86_64-*-* } } } */
+
+int b, d, e;
+unsigned long long c = 4100543410106915;
+
+void
+foo (void)
+{
+  short f, g = 4 % c;
+  int h = c;
+  if (h)
+    {
+      int i = ~c;
+      if (~c)
+	i = 25662;
+      f = g = i;
+      h = c - g + ~-f;
+      c = ~(c * h - f);
+    }
+  f = g;
+  unsigned long long k = g || c;
+  short l = c ^ g ^ k;
+  if (g > 25662 || c == 74074520320 || !(g < 2))
+    {
+      k = c;
+      l = g;
+      c = ~((k && c) + ~l);
+      f = ~(f * (c ^ k) | l);
+      if (c > k)
+	__builtin_printf ("%d\n", f);
+    }
+  short m = -f;
+  unsigned long long n = c;
+  c = m * f | n % c;
+  if (n)
+    __builtin_printf ("%d\n", f);
+  while (f < -31807)
+    ;
+  c = ~(n | c) | f;
+  if (n < c)
+    __builtin_printf ("%lld\n", (long long) f);
+  for (; d;)
+    for (; e;)
+      for (;;)
+	;
+  c = h;
+  c = l % c;
+}