--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/graphite/pr84872.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,19 @@
+/* PR rtl-optimization/84872 */
+/* { dg-do compile { target pthread } } */
+/* { dg-options "-O1 -floop-parallelize-all -freorder-blocks-and-partition -fschedule-insns2 -fselective-scheduling2 -fsel-sched-pipelining -fno-tree-dce" } */
+
+void
+foo (int x)
+{
+  int a[2];
+  int b, c = 0;
+
+  for (b = 0; b < 2; ++b)
+    a[b] = 0;
+  for (b = 0; b < 2; ++b)
+    a[b] = 0;
+
+  while (c < 1)
+    while (x < 1)
+      ++x;
+}