52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
/* Boost interval/detail/x86gcc_rounding_control.hpp file
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*
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* Copyright 2000 Jens Maurer
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* Copyright 2002 Hervé Brönnimann, 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_X86GCC_ROUNDING_CONTROL_HPP
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#define BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP
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#ifndef __GNUC__
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# error This header only works with GNU CC.
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#endif
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#ifndef __i386__
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# error This header only works on x86 CPUs.
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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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struct x86_rounding
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{
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typedef unsigned short rounding_mode;
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static void set_rounding_mode(const rounding_mode& mode)
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{ __asm__ __volatile__ ("fldcw %0" : : "m"(mode)); }
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static void get_rounding_mode(rounding_mode& mode)
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{ __asm__ __volatile__ ("fnstcw %0" : "=m"(mode)); }
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template<class T>
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static T to_int(T r)
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{
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T r_;
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__asm__ ("frndint" : "=&t"(r_) : "0"(r));
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return r_;
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}
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};
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} // namespace detail
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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_DETAIL_X86GCC_ROUNDING_CONTROL_HPP */
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