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// PR optimization/11198

// Origin: Joerg Walter 

// Reduced testcase by: Volker Reichelt 

//                      Wolfgang Bangerth 

// The compiler used to allocate the same stack slot for two aggregates,

// overlooking that assignments to members given the same address on the

// stack may not alias and thus may be reordered by the scheduling passes.

// { dg-do run }

// { dg-options "-O2 -frename-registers" }

double zero_;

inline const int&

min(const int& a, const int& b) {

  if (b < a) return b; return a;

}

struct barrier { barrier () {} };

template  struct unbounded_array {

    inline unbounded_array (): data_ (new double [9]) {}

    inline double& operator [] (int i) { return data_ [i]; }

    double* data_;

};

inline int element (int i, int j) {

  return i + j;

}

template 

struct matrix {

    inline matrix () : size2_ (3) {}

    inline unbounded_array<> &data () { return data_; }

    inline double& el (int i, int j) {

      int dead1 = j;

      int dead2 = 1 + i - j;

      if (j < size2_ && i-j < 2)

        return data () [element (j,i-j+1)];

      barrier ();

      return zero_;

    }

    struct iterator2;

    inline iterator2 find () {

      return iterator2 (*this);

    }

    struct iterator1 {

        inline iterator1 (matrix *m):

                        dead1 (m), i (0) {}

        void *dead1;

        int i;

        int dead2;

    };

    const int size2_;

    unbounded_array<> data_;

};

template

struct adaptor {

    adaptor (matrix<> &m) : m(&m), upper_ (1) {}

    int size1 () const;

    int size2 () const     { return 3; }

    int lower () const     { return 1; }

    int upper () const     { return upper_; }

    matrix<> &data () { return *m; }

    double& el (int i, int j) {

      int dead1, dead2;

      if (j < size2 () && i-j < 1)

        return data ().el (i, j);

      barrier ();

      return zero_;

    }

    struct a_iterator2;

    struct a_iterator1 {

        a_iterator1 (adaptor &a, const matrix<>::iterator1 &it1):

                        a (&a), dead1 (it1) {}

        a_iterator2 begin () const {

          return a_iterator2(*a);

        }

        adaptor *a;

        matrix<>::iterator1 dead1;

    };

    struct a_iterator2 {

        a_iterator2 (adaptor &a) : a (&a) {}

        double& f () const {

          int i = 0;

          int l = a->upper () + i;

          int q = a->size2 ();

          if (0 < q &&

              l < a->lower () + 1 + a->upper ())

            return a->m->el(0,0);

          return a->el (i, 0);

        }

        adaptor *a;

    };

    matrix<> *m;

    int upper_;

};

void matrix_swap (adaptor<> &bam1, adaptor<> &bam2)

{

  adaptor<>::a_iterator1 it1 (bam1,matrix<>::iterator1(bam1.m)),

                         it2 (bam2,matrix<>::iterator1(bam2.m));

  int dead;

  double x = it1.begin().f();

  it2.begin().f() = x;

}

int main ()

{

  matrix<> m1,m2;

  adaptor<> bam1 (m1), bam2 (m2);

  matrix_swap (bam1, bam2);

  return 0;

}