1 files changed, 43 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr44258.c b/gcc/testsuite/gcc.dg/tree-ssa/pr44258.c
new file mode 100644
index 00000000000..a98d3ceccbf
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr44258.c
@@ -0,0 +1,43 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-esra-details" } */
+
+struct blah
+{
+  char a[4];
+};
+
+struct str
+{
+  struct blah b1;
+  char x;
+};
+
+struct val
+{
+  char y;
+  struct blah b2;
+};
+
+union U
+{
+  struct str str;
+  struct val val;
+};
+
+
+extern struct blah e_b1, e_b2;
+extern union U *e_u;
+
+int foo (int b)
+{
+  union U u;
+
+  u.str.b1 = e_b1;
+  u.val.b2 = e_b2;
+  u.str.b1.a[3] = 0;
+
+  *e_u = u;
+}
+
+/* { dg-final { scan-tree-dump-times "Created a replacement" 0 "esra"} } */
+/* { dg-final { cleanup-tree-dump "esra" } } */