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