--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr83141.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,37 @@
+/* { dg-do run } */
+/* { dg-options "-O -fdump-tree-esra-details" } */
+
+volatile short vs;
+volatile long vl;
+
+struct A { short s; long i; long j; };
+struct A a, b;
+void foo ()
+{
+  struct A c;
+  __builtin_memcpy (&c, &b, sizeof (struct A));
+  __builtin_memcpy (&a, &c, sizeof (struct A));
+
+  vs = c.s;
+  vl = c.i;
+  vl = c.j;
+}
+
+
+int main()
+{
+  if ((sizeof (short) != 2)
+      || (__builtin_offsetof (struct A, i) < 4))
+    return 0;
+
+  __builtin_memset (&b, 0, sizeof (struct A));
+  b.s = 1;
+  __builtin_memcpy ((char *)&b+2, &b, 2);
+  foo ();
+  __builtin_memcpy (&a, (char *)&a+2, 2);
+  if (a.s != 1)
+    __builtin_abort ();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-not "Will attempt to totally scalarize" "esra" } } */