1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/torture/pr38745.C b/gcc/testsuite/g++.dg/torture/pr38745.C
new file mode 100644
index 000000000..4ad9d85fe
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr38745.C
@@ -0,0 +1,36 @@
+/* { dg-do compile } */
+
+union u_u16
+{
+  unsigned short v;
+  struct
+    {
+      unsigned char lo8, hi8;
+    } __attribute__ ((__may_alias__)) u;
+} __attribute__ ((__may_alias__));
+union u_u32
+{
+  unsigned int v;
+  struct
+    {
+      u_u16 lo16, hi16;
+    } u;
+} __attribute__ ((__may_alias__));
+union u_u64
+{
+  struct
+    {
+      u_u32 lo32, hi32;
+    } u;
+};
+struct Record
+{
+};
+long long
+UnpackFullKey (Record & rec, const char *&p)
+{
+  long long c64 = 0;
+  (*(u_u16 *) & (*(u_u32 *) & ( *(u_u64*)&c64).u.lo32.v).u.lo16.v).u.hi8 = 1;
+  return c64;
+}
+