--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/sms-compare-debug-2.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcompare-debug -fmodulo-sched" } */
+
+struct S { int f; signed int g : 2; } a[1], c = {5, 1}, d;
+short b;
+
+__attribute__((noinline, noclone)) void
+foo (int x)
+{
+  if (x != 1)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  while (b++ <= 0)
+    {
+      struct S e = {1, 1};
+      d = e = a[0] = c;
+    }
+  foo (a[0].g);
+  return 0;
+}