Chris@16: /* Boost interval/detail/x86gcc_rounding_control.hpp file
Chris@16:  *
Chris@16:  * Copyright 2000 Jens Maurer
Chris@16:  * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
Chris@16:  *
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  * (See accompanying file LICENSE_1_0.txt or
Chris@16:  * copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP
Chris@16: #define BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP
Chris@16: 
Chris@16: #ifndef __GNUC__
Chris@16: #  error This header only works with GNU CC.
Chris@16: #endif
Chris@16: 
Chris@16: #ifndef __i386__
Chris@16: #  error This header only works on x86 CPUs.
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace numeric {
Chris@16: namespace interval_lib {
Chris@16: namespace detail {
Chris@16: 
Chris@16: struct x86_rounding
Chris@16: {
Chris@16:   typedef unsigned short rounding_mode;
Chris@16: 
Chris@16:   static void set_rounding_mode(const rounding_mode& mode)
Chris@16:   { __asm__ __volatile__ ("fldcw %0" : : "m"(mode)); }
Chris@16: 
Chris@16:   static void get_rounding_mode(rounding_mode& mode)
Chris@16:   { __asm__ __volatile__ ("fnstcw %0" : "=m"(mode)); }
Chris@16: 
Chris@16:   template<class T>
Chris@16:   static T to_int(T r)
Chris@16:   {
Chris@16:     T r_;
Chris@16:     __asm__ ("frndint" : "=&t"(r_) : "0"(r));
Chris@16:     return r_;
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace interval_lib
Chris@16: } // namespace numeric
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_X86GCC_ROUNDING_CONTROL_HPP */