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51 lines
1.2 KiB
51 lines
1.2 KiB
/* 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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