/* Boost interval/detail/x86_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) | |
*/ | |
#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP | |
#define BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP | |
#ifdef __GNUC__ | |
# include <boost/numeric/interval/detail/x86gcc_rounding_control.hpp> | |
#elif defined(__BORLANDC__) | |
# include <boost/numeric/interval/detail/bcc_rounding_control.hpp> | |
#elif defined(_MSC_VER) | |
# include <boost/numeric/interval/detail/msvc_rounding_control.hpp> | |
#elif defined(__MWERKS__) || defined(__ICC) || defined (__SUNPRO_CC) | |
# define BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM | |
# include <boost/numeric/interval/detail/c99sub_rounding_control.hpp> | |
#else | |
# error Unsupported C++ compiler. | |
#endif | |
namespace boost { | |
namespace numeric { | |
namespace interval_lib { | |
namespace detail { | |
#ifdef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM | |
typedef c99_rounding_control x86_rounding_control; | |
#undef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM | |
#else | |
struct fpu_rounding_modes | |
{ | |
unsigned short to_nearest; | |
unsigned short downward; | |
unsigned short upward; | |
unsigned short toward_zero; | |
}; | |
// exceptions masked, extended precision | |
// hardware default is 0x037f (0x1000 only has a meaning on 287) | |
static const fpu_rounding_modes rnd_mode = { 0x137f, 0x177f, 0x1b7f, 0x1f7f }; | |
struct x86_rounding_control: x86_rounding | |
{ | |
static void to_nearest() { set_rounding_mode(rnd_mode.to_nearest); } | |
static void downward() { set_rounding_mode(rnd_mode.downward); } | |
static void upward() { set_rounding_mode(rnd_mode.upward); } | |
static void toward_zero() { set_rounding_mode(rnd_mode.toward_zero); } | |
}; | |
#endif // BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM | |
} // namespace detail | |
template<> | |
struct rounding_control<float>: detail::x86_rounding_control | |
{ | |
static float force_rounding(const float& r) | |
{ volatile float r_ = r; return r_; } | |
}; | |
template<> | |
struct rounding_control<double>: detail::x86_rounding_control | |
{ | |
/*static double force_rounding(double r) | |
{ asm volatile ("" : "+m"(r) : ); return r; }*/ | |
static double force_rounding(const double& r) | |
{ volatile double r_ = r; return r_; } | |
}; | |
namespace detail { | |
template<bool> | |
struct x86_rounding_control_long_double; | |
template<> | |
struct x86_rounding_control_long_double<false>: x86_rounding_control | |
{ | |
static long double force_rounding(long double const &r) | |
{ volatile long double r_ = r; return r_; } | |
}; | |
template<> | |
struct x86_rounding_control_long_double<true>: x86_rounding_control | |
{ | |
static long double const &force_rounding(long double const &r) | |
{ return r; } | |
}; | |
} // namespace detail | |
template<> | |
struct rounding_control<long double>: | |
detail::x86_rounding_control_long_double< (sizeof(long double) >= 10) > | |
{}; | |
} // namespace interval_lib | |
} // namespace numeric | |
} // namespace boost | |
#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE | |
#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP */ |