1 files changed, 42 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr47392.c b/gcc/testsuite/gcc.dg/tree-ssa/pr47392.c
new file mode 100644
index 00000000000..20161363fbd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr47392.c
@@ -0,0 +1,42 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -fdump-tree-pre-stats" } */
+
+struct A
+{
+  int i;
+};
+
+struct B
+{
+  struct A a[2];
+};
+
+int i = 1;
+struct B b = { 0, 3 };
+
+void
+test ()
+{
+  if (b.a[0].i != i)
+    {
+      int t = b.a[0].i;
+      b.a[0] = b.a[1];
+      b.a[1].i = t;
+    }
+
+  if (b.a[1].i == i)
+    __builtin_abort ();
+
+  if (b.a[0].i == 0)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  test ();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "Eliminated: 1" "pre" } } */
+/* { dg-final { cleanup-tree-dump "pre" } } */