/* Boost interval/detail/sparc_rounding_control.hpp file

 *

 * Copyright 2000 Jens Maurer

 * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion

 *

 * 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)

 *

 * The basic code in this file was kindly provided by Jeremy Siek.

 */



#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP

#define BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP



#if !defined(sparc) && !defined(__sparc__)

#  error This header is only intended for SPARC CPUs.

#endif



#ifdef __SUNPRO_CC

#  include <ieeefp.h>

#endif





namespace boost {

namespace numeric {

namespace interval_lib {

namespace detail {



struct sparc_rounding_control

{

  typedef unsigned int rounding_mode;



  static void set_rounding_mode(const rounding_mode& mode)

  {

#   if defined(__GNUC__)

    __asm__ __volatile__("ld %0, %%fsr" : : "m"(mode));

#   elif defined (__SUNPRO_CC)

    fpsetround(fp_rnd(mode));

#   elif defined(__KCC)

    asm("sethi %hi(mode), %o1");

    asm("ld [%o1+%lo(mode)], %fsr");

#   else

#     error Unsupported compiler for Sparc rounding control.

#   endif

  }



  static void get_rounding_mode(rounding_mode& mode)

  {

#   if defined(__GNUC__)

    __asm__ __volatile__("st %%fsr, %0" : "=m"(mode));

#   elif defined (__SUNPRO_CC)

    mode = fpgetround();

#   elif defined(__KCC)

#     error KCC on Sun SPARC get_round_mode: please fix me

    asm("st %fsr, [mode]");

#   else

#     error Unsupported compiler for Sparc rounding control.

#   endif

  }



#if defined(__SUNPRO_CC)

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

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

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

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

#else

  static void downward()    { set_rounding_mode(0xc0000000); }

  static void upward()      { set_rounding_mode(0x80000000); }

  static void to_nearest()  { set_rounding_mode(0x00000000); }

  static void toward_zero() { set_rounding_mode(0x40000000); }

#endif

};



} // namespace detail



extern "C" {

  float rintf(float);

  double rint(double);

}



template<>

struct rounding_control<float>:

  detail::sparc_rounding_control

{

  static const float& force_rounding(const float& x) { return x; }

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

};



template<>

struct rounding_control<double>:

  detail::sparc_rounding_control

{

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

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

};



template<>

struct rounding_control<long double>:

  detail::sparc_rounding_control

{

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

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

};



} // namespace interval_lib

} // namespace numeric

} // namespace boost



#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE



#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP */

