/* 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 */ |