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/* 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 */
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