--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/torture/pr55270.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+
+unsigned a, b, c;
+
+void f(void)
+{
+  for(; a; a++)
+    {
+      long *p1 = (long *)&b;
+
+      if(*p1)
+	return;
+
+      if(b && (*p1 = b) || c && ++*p1)
+	{
+	  unsigned *p2 = &b;
+
+	  for(*p2 = 0; *p2 < 1;)
+	    for(; b; b++);
+	}
+    }
+}