You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
108 lines
3.1 KiB
108 lines
3.1 KiB
/* 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 */
|
|
|