109 lines
3.2 KiB
Plaintext
109 lines
3.2 KiB
Plaintext
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/* Boost interval/detail/x86_rounding_control.hpp file
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*
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* Copyright 2000 Jens Maurer
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* Copyright 2002 Herv<72> Br<42>nnimann, Guillaume Melquiond, Sylvain Pion
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*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or
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* copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP
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#define BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP
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#ifdef __GNUC__
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# include <boost/numeric/interval/detail/x86gcc_rounding_control.hpp>
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#elif defined(__BORLANDC__)
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# include <boost/numeric/interval/detail/bcc_rounding_control.hpp>
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#elif defined(_MSC_VER)
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# include <boost/numeric/interval/detail/msvc_rounding_control.hpp>
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#elif defined(__MWERKS__) || defined(__ICC) || defined (__SUNPRO_CC)
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# define BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
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# include <boost/numeric/interval/detail/c99sub_rounding_control.hpp>
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#else
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# error Unsupported C++ compiler.
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#endif
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namespace boost {
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namespace numeric {
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namespace interval_lib {
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namespace detail {
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#ifdef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
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typedef c99_rounding_control x86_rounding_control;
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#undef BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
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#else
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struct fpu_rounding_modes
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{
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unsigned short to_nearest;
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unsigned short downward;
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unsigned short upward;
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unsigned short toward_zero;
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};
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// exceptions masked, extended precision
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// hardware default is 0x037f (0x1000 only has a meaning on 287)
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static const fpu_rounding_modes rnd_mode = { 0x137f, 0x177f, 0x1b7f, 0x1f7f };
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struct x86_rounding_control: x86_rounding
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{
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static void to_nearest() { set_rounding_mode(rnd_mode.to_nearest); }
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static void downward() { set_rounding_mode(rnd_mode.downward); }
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static void upward() { set_rounding_mode(rnd_mode.upward); }
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static void toward_zero() { set_rounding_mode(rnd_mode.toward_zero); }
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};
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#endif // BOOST_NUMERIC_INTERVAL_USE_C99_SUBSYSTEM
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} // namespace detail
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template<>
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struct rounding_control<float>: detail::x86_rounding_control
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{
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static float force_rounding(const float& r)
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{ volatile float r_ = r; return r_; }
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};
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template<>
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struct rounding_control<double>: detail::x86_rounding_control
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{
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/*static double force_rounding(double r)
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{ asm volatile ("" : "+m"(r) : ); return r; }*/
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static double force_rounding(const double& r)
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{ volatile double r_ = r; return r_; }
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};
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namespace detail {
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template<bool>
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struct x86_rounding_control_long_double;
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template<>
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struct x86_rounding_control_long_double<false>: x86_rounding_control
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{
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static long double force_rounding(long double const &r)
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{ volatile long double r_ = r; return r_; }
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};
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template<>
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struct x86_rounding_control_long_double<true>: x86_rounding_control
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{
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static long double const &force_rounding(long double const &r)
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{ return r; }
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};
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} // namespace detail
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template<>
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struct rounding_control<long double>:
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detail::x86_rounding_control_long_double< (sizeof(long double) >= 10) >
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{};
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} // namespace interval_lib
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} // namespace numeric
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} // namespace boost
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#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
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#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_X86_ROUNDING_CONTROL_HPP */
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