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