--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr83972.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,26 @@
+/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O1 -fschedule-insns -fselective-scheduling -fsel-sched-pipelining -fvar-tracking-assignments -funroll-loops -fno-tree-dominator-opts -w" } */
+
+int s7, p0;
+
+void
+i0 (int ke)
+{
+  while (ke < 1)
+    {
+      if (s7 == 0)
+        p0 = 0;
+      else
+        {
+          if (p0 == 0)
+            s7 = 0;
+
+          if (!!s7 || !!p0)
+            s7 = 0;
+          else
+            p0 = 0;
+        }
+
+      ++ke;
+    }
+}