| /* 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) |
| # 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 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 */ |