1 files changed, 44 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr56997-3.c b/gcc/testsuite/gcc.dg/pr56997-3.c
new file mode 100644
index 00000000000..3754b108ac6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr56997-3.c
@@ -0,0 +1,44 @@
+/* Test volatile access to unaligned field.  */
+/* { dg-do run } */
+/* { dg-options "-fstrict-volatile-bitfields" } */
+
+extern void abort (void);
+
+#define test_type unsigned long long
+#define MAGIC 0x102030405060708ull
+
+typedef struct s{
+ unsigned char Prefix;
+ test_type Type;
+}__attribute((__packed__)) ss;
+
+volatile ss v;
+ss g;
+
+void __attribute__((noinline))
+foo (test_type u)
+{
+  v.Type = u;
+}
+
+test_type __attribute__((noinline))
+bar (void)
+{
+  return v.Type;
+}
+
+int main()
+{
+  test_type temp;
+  foo(MAGIC);
+  __builtin_memcpy(&g, (void *)&v, sizeof(g));
+  if (g.Type != MAGIC)
+    abort ();
+
+  g.Type = MAGIC;
+  __builtin_memcpy((void *)&v, &g, sizeof(v));
+  temp = bar();
+  if (temp != MAGIC)
+    abort ();
+  return 0;
+}