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x86_rounding_control.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\numeric\interval\detail\x86_rounding_control.hpp
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/* Boost interval/detail/x86_rounding_control.hpp file * * Copyright 2000 Jens Maurer * Copyright 2002 Herv� Br�nnimann, 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
#elif defined(__BORLANDC__) # include
#elif defined(_MSC_VER) # include
#elif defined(__MWERKS__) || defined(__ICC) # define BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM # include
#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
: detail::x86_rounding_control { static float force_rounding(const float& r) { volatile float r_ = r; return r_; } }; template<> struct rounding_control
: 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
struct x86_rounding_control_long_double; template<> struct x86_rounding_control_long_double
: 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
: x86_rounding_control { static long double const &force_rounding(long double const &r) { return r; } }; } // namespace detail template<> struct rounding_control
: 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 */
x86_rounding_control.hpp
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