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1 | /* Boost interval/detail/x86gcc_rounding_control.hpp file |
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2 | * |
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3 | * Copyright 2000 Jens Maurer |
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4 | * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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5 | * |
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6 | * Distributed under the Boost Software License, Version 1.0. |
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7 | * (See accompanying file LICENSE_1_0.txt or |
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8 | * copy at http://www.boost.org/LICENSE_1_0.txt) |
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9 | */ |
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10 | |
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11 | #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP |
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12 | #define BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP |
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13 | |
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14 | #ifndef __GNUC__ |
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15 | # error This header only works with GNU CC. |
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16 | #endif |
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17 | |
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18 | #ifndef __i386__ |
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19 | # error This header only works on x86 CPUs. |
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20 | #endif |
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21 | |
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22 | namespace boost { |
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23 | namespace numeric { |
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24 | namespace interval_lib { |
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25 | namespace detail { |
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26 | |
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27 | struct x86_rounding |
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28 | { |
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29 | typedef unsigned short rounding_mode; |
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30 | |
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31 | static void set_rounding_mode(const rounding_mode& mode) |
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32 | { __asm__ __volatile__ ("fldcw %0" : : "m"(mode)); } |
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33 | |
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34 | static void get_rounding_mode(rounding_mode& mode) |
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35 | { __asm__ __volatile__ ("fnstcw %0" : "=m"(mode)); } |
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36 | |
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37 | template<class T> |
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38 | static T to_int(T r) |
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39 | { |
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40 | T r_; |
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41 | __asm__ ("frndint" : "=&t"(r_) : "0"(r)); |
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42 | return r_; |
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43 | } |
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44 | }; |
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45 | |
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46 | } // namespace detail |
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47 | } // namespace interval_lib |
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48 | } // namespace numeric |
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49 | } // namespace boost |
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50 | |
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51 | #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP */ |
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