[PATCH] Fix PR64568 for real

[Richard Biener <rguenther at suse dot de>]

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2015-01-16  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/64568
	* tree-ssa-forwprop.c (pass_forwprop::execute): Guard
	complex load rewriting for TARGET_MEM_REFs.

	* g++.dg/torture/pr64568-2.C: New testcase.

Index: gcc/tree-ssa-forwprop.c
===================================================================
--- gcc/tree-ssa-forwprop.c	(revision 219724)
+++ gcc/tree-ssa-forwprop.c	(working copy)
@@ -2230,6 +2230,8 @@ pass_forwprop::execute (function *fun)
 	  else if (TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE
 		   && gimple_assign_load_p (stmt)
 		   && !gimple_has_volatile_ops (stmt)
+		   && (TREE_CODE (gimple_assign_rhs1 (stmt))
+		       != TARGET_MEM_REF)
 		   && !stmt_can_throw_internal (stmt))
 	    {
 	      /* Rewrite loads used only in real/imagpart extractions to
Index: gcc/testsuite/g++.dg/torture/pr64568-2.C
===================================================================
--- gcc/testsuite/g++.dg/torture/pr64568-2.C	(revision 0)
+++ gcc/testsuite/g++.dg/torture/pr64568-2.C	(working copy)
@@ -0,0 +1,146 @@
+// { dg-do compile }
+
+namespace std
+{
+  typedef __SIZE_TYPE__ size_t;
+}
+class H;
+namespace std
+{
+  template <typename> struct complex;
+  template <typename _Tp>
+      complex<_Tp> operator+(complex<_Tp> &__x, complex<_Tp> __y)
+	{
+	  complex<_Tp> a = __x;
+	  a += __y;
+	  return a;
+	}
+  template <> struct complex<double>
+    {
+      int
+	  imag ()
+	    {
+	      return __imag__ _M_value;
+	    }
+      void operator+=(complex __z) { _M_value += _M_value; _M_value  += __z.imag (); }
+      _Complex double _M_value;
+    };
+}
+struct A
+{
+  typedef std::complex<double> &const_reference;
+};
+class B
+{
+public:
+    B (int);
+    std::complex<double> &operator[](int i) { return data_[i]; }
+    std::complex<double> *data_;
+};
+struct C
+{
+  static std::complex<double>
+      apply (A::const_reference t1, std::complex<double> t2)
+	{
+	  return t1 + t2;
+	}
+  typedef std::complex<double> result_type;
+};
+template <class T1, class> struct D
+{
+  static void
+      apply (T1 t1, std::complex<double> t2)
+	{
+	  t1 = t2;
+	}
+};
+class ublas_expression
+{
+public:
+    ~ublas_expression ();
+};
+template <class> class F
+{
+};
+template <class E> class matrix_expression : ublas_expression
+{
+public:
+    E &operator()() {}
+};
+class I : public F<int>
+{
+public:
+    typedef int value_type;
+    I (int);
+};
+template <class E1, class E2> matrix_expression<int> outer_prod (F<E1>, F<E2>);
+template <class E1, class F> class J : public matrix_expression<J<E1, F> >
+{
+public:
+    typedef typename F::result_type value_type;
+    value_type operator()(int i, int)
+      {
+	return F::apply (e1_ (i, 0), e2_ (0, 0));
+      }
+    E1 e1_;
+    E1 e2_;
+};
+template <class E1, class E2>
+J<H, C> operator+(matrix_expression<E1>, matrix_expression<E2>);
+template <template <class, class> class F, class M, class E>
+void
+indexing_matrix_assign (M m, matrix_expression<E> e, int)
+{
+  for (int i; i; ++i)
+    F<typename M::reference, typename E::value_type>::apply (m (0, 0),
+							     e ()(i, 0));
+}
+template <template <class, class> class F, class, class M, class E, class C>
+void
+matrix_assign (M m, matrix_expression<E> e, int, C)
+{
+  indexing_matrix_assign<F> (m, e, 0);
+}
+template <template <class, class> class F, class M, class E>
+void
+matrix_assign (M m, matrix_expression<E> e)
+{
+  matrix_assign<F, int> (m, e, 0, typename M::orientation_category ());
+}
+class H : matrix_expression<int>
+{
+public:
+    typedef std::complex<double> &reference;
+    typedef int orientation_category;
+    H (int, int) : data_ (0) {}
+    template <class AE> H (matrix_expression<AE> ae) : data_ (0)
+  {
+    matrix_assign<D> (*this, ae);
+  }
+    B &
+	data ()
+	  {
+	  }
+    std::complex<double> &operator()(int i, int) { return data ()[i]; }
+    void operator+=(matrix_expression ae) { H (*this + ae); }
+    B data_;
+};
+template <class M, class T, class V1, class V2>
+void
+sr2 (M m, T, V1 v1, V2 v2)
+{
+  m += outer_prod (v2, v1);
+}
+template <class, class, std::size_t> struct G
+{
+  void test ();
+};
+template struct G<I, H, 3>;
+template <class V, class M, std::size_t N>
+void
+G<V, M, N>::test ()
+{
+  V b (0), c (0);
+  M m (0, 0);
+  sr2 (m, typename V::value_type (), b, c);
+}