Chris@16: /* Boost interval/detail/x86_rounding_control.hpp file
Chris@16:  *
Chris@16:  * Copyright 2000 Jens Maurer
Chris@16:  * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
Chris@16:  *
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  * (See accompanying file LICENSE_1_0.txt or
Chris@16:  * copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP
Chris@16: #define BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP
Chris@16: 
Chris@16: #ifdef __GNUC__
Chris@16: #  include <boost/numeric/interval/detail/x86gcc_rounding_control.hpp>
Chris@16: #elif defined(__BORLANDC__)
Chris@16: #  include <boost/numeric/interval/detail/bcc_rounding_control.hpp>
Chris@16: #elif defined(_MSC_VER)
Chris@16: #  include <boost/numeric/interval/detail/msvc_rounding_control.hpp>
Chris@16: #elif defined(__MWERKS__) || defined(__ICC) || defined (__SUNPRO_CC)
Chris@16: #  define BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
Chris@16: #  include <boost/numeric/interval/detail/c99sub_rounding_control.hpp>
Chris@16: #else
Chris@16: #  error Unsupported C++ compiler.
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace numeric {
Chris@16: namespace interval_lib {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: #ifdef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
Chris@16: typedef c99_rounding_control x86_rounding_control;
Chris@16: #undef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
Chris@16: #else
Chris@16: struct fpu_rounding_modes
Chris@16: {
Chris@16:   unsigned short to_nearest;
Chris@16:   unsigned short downward;
Chris@16:   unsigned short upward;
Chris@16:   unsigned short toward_zero;
Chris@16: };
Chris@16: 
Chris@16: // exceptions masked, extended precision
Chris@16: // hardware default is 0x037f (0x1000 only has a meaning on 287)
Chris@16: static const fpu_rounding_modes rnd_mode = { 0x137f, 0x177f, 0x1b7f, 0x1f7f };
Chris@16: 
Chris@16: struct x86_rounding_control: x86_rounding
Chris@16: {
Chris@16:   static void to_nearest()  { set_rounding_mode(rnd_mode.to_nearest);  }
Chris@16:   static void downward()    { set_rounding_mode(rnd_mode.downward);    }
Chris@16:   static void upward()      { set_rounding_mode(rnd_mode.upward);      }
Chris@16:   static void toward_zero() { set_rounding_mode(rnd_mode.toward_zero); }
Chris@16: };
Chris@16: #endif // BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template<>
Chris@16: struct rounding_control<float>: detail::x86_rounding_control
Chris@16: {
Chris@16:   static float force_rounding(const float& r) 
Chris@16:   { volatile float r_ = r; return r_; }
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct rounding_control<double>: detail::x86_rounding_control
Chris@16: {
Chris@16:   /*static double force_rounding(double r) 
Chris@16:   { asm volatile ("" : "+m"(r) : ); return r; }*/
Chris@16:   static double force_rounding(const double& r) 
Chris@16:   { volatile double r_ = r; return r_; }
Chris@16: };
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: template<bool>
Chris@16: struct x86_rounding_control_long_double;
Chris@16: 
Chris@16: template<>
Chris@16: struct x86_rounding_control_long_double<false>: x86_rounding_control
Chris@16: {
Chris@16:   static long double force_rounding(long double const &r)
Chris@16:   { volatile long double r_ = r; return r_; }
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct x86_rounding_control_long_double<true>: x86_rounding_control
Chris@16: {
Chris@16:   static long double const &force_rounding(long double const &r)
Chris@16:   { return r; }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template<>
Chris@16: struct rounding_control<long double>:
Chris@16:   detail::x86_rounding_control_long_double< (sizeof(long double) >= 10) >
Chris@16: {};
Chris@16: 
Chris@16: } // namespace interval_lib
Chris@16: } // namespace numeric
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
Chris@16: 
Chris@16: #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP */