1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/torture/pr39713.C b/gcc/testsuite/g++.dg/torture/pr39713.C
new file mode 100644
index 000000000..4ff72d1a7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr39713.C
@@ -0,0 +1,25 @@
+/* { dg-do compile } */
+
+template <typename To, typename From>
+static inline To
+bitwise_cast (From from)
+{
+  union
+    {
+      From f;
+      To t;
+    } u;
+  u.f = from;
+  return u.t;
+}
+
+extern void foo (unsigned char *);
+
+double
+bar ()
+{
+  unsigned char b[sizeof (unsigned long long)];
+  foo (b);
+  return bitwise_cast<double> (*(unsigned long long *) b);
+}
+