/* Boost interval/detail/ia64_rounding_control.hpp file

 *

 * Copyright 2006-2007 Boris Gubenko

 *

 * Distributed under the Boost Software License, Version 1.0.

 * (See accompanying file LICENSE_1_0.txt or

 * copy at http://www.boost.org/LICENSE_1_0.txt)

 */



#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP

#define BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP



#if !defined(ia64) && !defined(__ia64) && !defined(__ia64__)

#error This header only works on ia64 CPUs.

#endif



#if defined(__hpux)



#   include <fenv.h>



namespace boost {

namespace numeric {

namespace interval_lib {

namespace detail {





    struct ia64_rounding_control

    {

    typedef unsigned int rounding_mode;



    static void set_rounding_mode(const rounding_mode& mode)  { 

fesetround(mode); }

    static void get_rounding_mode(rounding_mode& mode)  { mode = fegetround(); }



    static void downward()    { set_rounding_mode(FE_DOWNWARD); }

    static void upward()      { set_rounding_mode(FE_UPWARD); }

    static void to_nearest()  { set_rounding_mode(FE_TONEAREST); }

    static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); }

    };



} // namespace detail



extern "C" {

  float rintf(float);

  double rint(double);

  long double rintl(long double);

}



template<>

struct rounding_control<float>:

  detail::ia64_rounding_control

{

  static float force_rounding(const float r)

  { volatile float _r = r; return _r; }

  static float to_int(const float& x) { return rintf(x); }

};



template<>

struct rounding_control<double>:

  detail::ia64_rounding_control

{

  static const double & force_rounding(const double& r) { return r; }

  static double to_int(const double& r) { return rint(r); }

};



template<>

struct rounding_control<long double>:

  detail::ia64_rounding_control

{

  static const long double & force_rounding(const long double& r) { return r; }

  static long double to_int(const long double& r) { return rintl(r); }

};



} // namespace interval_lib

} // namespace numeric

} // namespace boost



#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE



#endif /* __hpux */



#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP */



