1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr30778.c b/gcc/testsuite/gcc.c-torture/execute/pr30778.c
new file mode 100644
index 000000000..1b05189f4
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr30778.c
@@ -0,0 +1,34 @@
+extern void *memset (void *, int, unsigned long);
+extern void abort (void);
+
+struct reg_stat {
+  void *last_death;
+  void *last_set;
+  void *last_set_value;
+  int   last_set_label;
+  char  last_set_sign_bit_copies;
+  int   last_set_mode : 8;
+  char  last_set_invalid;
+  char sign_bit_copies;
+  long nonzero_bits;
+};
+
+static struct reg_stat *reg_stat;
+
+void __attribute__((noinline))
+init_reg_last (void)
+{
+  memset (reg_stat, 0, __builtin_offsetof (struct reg_stat, sign_bit_copies));
+}
+
+int main (void)
+{
+  struct reg_stat r;
+
+  reg_stat = &r;
+  r.nonzero_bits = -1;
+  init_reg_last ();
+  if (r.nonzero_bits != -1)
+    abort ();
+  return 0;
+}