text: /* 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 */
  
  