--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/graphite/pr81945.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,21 @@
+/* PR tree-optimization/81945 */
+/* { dg-do compile { target pthread } } */
+/* { dg-options "-O3 -ftree-parallelize-loops=2 -floop-nest-optimize" } */
+
+unsigned long int v;
+
+void
+foo (int x, int y, long int *a)
+{
+  do
+    {
+      int **b;
+
+      while (y != 0)
+        ;
+      v *= 2;
+      **b = *a;
+      ++x;
+    }
+  while (x < 1);
+}