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x86_fast_rounding_control.hpp
/* Boost interval/detail/x86gcc_rounding_control.hpp file * * This header provides a rounding control policy * that avoids flushing results to memory. In * order for this optimization to be reliable, it * should be used only when no underflow or * overflow would happen without it. Indeed, only * values in range are correctly rounded. * * 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_EXT_X86_FAST_ROUNDING_CONTROL_HPP #define BOOST_NUMERIC_INTERVAL_EXT_X86_FAST_ROUNDING_CONTROL_HPP namespace boost { namespace numeric { namespace interval_lib { namespace detail { // exceptions masked, expected precision (the mask is 0x0300) static const fpu_rounding_modes rnd_mode_f = { 0x107f, 0x147f, 0x187f, 0x1c7f }; static const fpu_rounding_modes rnd_mode_d = { 0x127f, 0x167f, 0x1a7f, 0x1e7f }; static const fpu_rounding_modes rnd_mode_l = { 0x137f, 0x177f, 0x1b7f, 0x1f7f }; } // namespace detail template<class T> struct x86_fast_rounding_control; template<> struct x86_fast_rounding_control<float>: detail::x86_rounding { static void to_nearest() { set_rounding_mode(detail::rnd_mode_f.to_nearest); } static void downward() { set_rounding_mode(detail::rnd_mode_f.downward); } static void upward() { set_rounding_mode(detail::rnd_mode_f.upward); } static void toward_zero() { set_rounding_mode(detail::rnd_mode_f.toward_zero); } static const float& force_rounding(const float& r) { return r; } }; template<> struct x86_fast_rounding_control<double>: detail::x86_rounding { static void to_nearest() { set_rounding_mode(detail::rnd_mode_d.to_nearest); } static void downward() { set_rounding_mode(detail::rnd_mode_d.downward); } static void upward() { set_rounding_mode(detail::rnd_mode_d.upward); } static void toward_zero() { set_rounding_mode(detail::rnd_mode_d.toward_zero); } static const double& force_rounding(const double& r) { return r; } }; template<> struct x86_fast_rounding_control<long double>: detail::x86_rounding { static void to_nearest() { set_rounding_mode(detail::rnd_mode_l.to_nearest); } static void downward() { set_rounding_mode(detail::rnd_mode_l.downward); } static void upward() { set_rounding_mode(detail::rnd_mode_l.upward); } static void toward_zero() { set_rounding_mode(detail::rnd_mode_l.toward_zero); } static const long double& force_rounding(const long double& r) { return r; } }; } // namespace interval_lib } // namespace numeric } // namespace boost #endif // BOOST_NUMERIC_INTERVAL_EXT_X86_FAST_ROUNDING_CONTROL_HPP
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