1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr51583.c b/gcc/testsuite/gcc.dg/tree-ssa/pr51583.c
new file mode 100644
index 000000000..2c4ec4723
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr51583.c
@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+typedef __complex__ double Value;
+
+union U
+{
+  Value v;
+  char c[sizeof(Value)];
+};
+
+struct S
+{
+  union U u;
+  int i,j;
+};
+
+Value gv;
+int gi, gj;
+
+Value foo (void)
+{
+  struct S s,t;
+
+  t.i = gi;
+  t.j = gj;
+  t.u.v = gv;
+  t.u.c[0] = 0;
+
+  s = t;
+  __imag__ s.u.v += s.i;
+
+  return s.u.v;
+}