1 files changed, 129 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/const1.C b/gcc/testsuite/g++.dg/opt/const1.C
new file mode 100644
index 00000000000..834cfd5e258
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/const1.C
@@ -0,0 +1,129 @@
+// This testcase was miscompiled on IA-64 to read from unitialized memory
+// and dereference it.
+// { dg-do run }
+// { dg-options "-O2" }
+
+struct A
+{
+  A () { a = 1; }
+  void a1 () { a++; }
+  bool a2 () { return !--a; }
+  unsigned int a;
+};
+
+struct B {};
+
+template <class T> struct C
+{
+  C () {}
+  C (const T& t) : c (t) {}
+  C<T> *next, *prev;
+  T c;
+};
+
+template <class T> struct D
+{
+  C<T> *d;
+  D () : d (0) {}
+  D (C<T> *x) : d (x) {}
+  D (const D<T>& x) : d (x.d) {}
+  bool operator!= (const D<T>& x) const { return d != x.d; }
+  const T& operator* () const { return d->c; }
+  D<T> operator++ (int) { D<T> t = *this; d = d->next; return t; }
+};
+
+template <class T> struct E
+{
+  C<T> *e;
+  E () : e (0) {}
+  E (C<T> *p) : e (p) {}
+  E (const E<T>& x) : e (x.e) {}
+  E (const D<T>& x) : e (x.e) {}
+  bool operator!= (const E<T>& x) const { return e != x.e; }
+  const T& operator* () const { return e->c; }
+  E<T>& operator++ () { e = e->next; return *this; }
+};
+
+template <class T> struct F : public A
+{
+  C<T> *f;
+  unsigned long f0;
+  F () { f = new C<T>; f->next = f->prev = f; f0 = 0; }
+  F (const F<T>& x) : A ()
+  {
+    f = new C<T>; f->next = f->prev = f; f0 = 0;
+    D<T> b (x.f->next), e (x.f), i (f);
+    while (b != e)
+      f1 (i, *b++);
+  }
+
+  ~F ()
+  {
+    C<T> *p = f->next;
+    while (p != f)
+      {
+	C<T> *x = p->next;
+	delete p;
+	p = x;
+      }
+    delete f;
+  }
+
+  D<T> f1 (D<T> x, const T& y)
+  {
+    C<T> *p = new C<T> (y);
+    p->next = x.d;
+    p->prev = x.d->prev;
+    x.d->prev->next = p;
+    x.d->prev = p;
+    f0++;
+    return p;
+  }
+};
+
+template <class T> struct G
+{
+  F<T> *g;
+  G () { g = new F<T>; }
+  G (const G<T>& x) { g = x.g; g->a1 (); }
+  ~G () {}
+  G<T>& operator= (const G<T>& x) { x.g->a1 (); g = x.g; return *this; }
+  D<T> g1 () { g4 (); return D<T> (g->f); }
+  E<T> g1 () const { return E<T> (g->f); }
+  E<T> g2 () const { return E<T> (g->f->next); }
+  D<T> g3 (const T& x) { g4 (); return g->f1 (g1 (), x); }
+  void g4 () { if (g->a > 1) { g->a2 (); g = new F<T> (*g); } }
+
+  G<T> operator+ (const G<T>& x) const
+  {
+    G<T> x2 (*this);
+    for (E<T> i = x.g2 (); i != x.g1 (); ++i)
+      x2.g3 (*i);
+    return x2;
+  }
+
+  G<T>& operator+= (const G<T>& x)
+  {
+    for (E<T> i = x.g2 (); i != x.g1 (); ++i)
+      g3 (*i);
+    return *this;
+  }
+};
+
+struct H : public G<B>
+{
+  H () {}
+  H (const H& x) : G<B> (x) {}
+  H (const G<B>& x) : G<B> (x) {}
+};
+
+void foo ();
+
+int
+main ()
+{
+  H a = H () + H ();
+  a += H ();
+  H b;
+  b = H () + H ();
+}