ceph/src/boost/libs/numeric/interval/include/boost/numeric/interval/detail/bcc_rounding_control.hpp

   1 /* Boost interval/detail/bcc_rounding_control.hpp file
   2  *
   3  * Copyright 2000 Jens Maurer
   4  * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
   5  *
   6  * Distributed under the Boost Software License, Version 1.0.
   7  * (See accompanying file LICENSE_1_0.txt or
   8  * copy at http://www.boost.org/LICENSE_1_0.txt)
   9  */
  10
  11 #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP
  12 #define BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP
  13
  14 #ifndef __BORLANDC__
  15 #  error This header is only intended for Borland C++.
  16 #endif
  17
  18 #ifndef _M_IX86
  19 #  error This header only works on x86 CPUs.
  20 #endif
  21
  22 #include <float.h>      // Borland C++ rounding control
  23
  24 namespace boost {
  25 namespace numeric {
  26 namespace interval_lib {
  27 namespace detail {
  28
  29 #ifndef BOOST_NUMERIC_INTERVAL_KEEP_EXCEPTIONS_FOR_BCC
  30 extern "C" { unsigned int _RTLENTRY _fm_init(void); }
  31
  32 struct borland_workaround {
  33   borland_workaround() { _fm_init(); }
  34 };
  35
  36 static borland_workaround borland_workaround_exec;
  37 #endif // BOOST_NUMERIC_INTERVAL_KEEP_EXCEPTIONS_FOR_BCC
  38
  39 __inline double rint(double)
  40 { __emit__(0xD9); __emit__(0xFC); /* asm FRNDINT */ }
  41
  42 struct x86_rounding
  43 {
  44   typedef unsigned int rounding_mode;
  45   static void get_rounding_mode(rounding_mode& mode)
  46   { mode = _control87(0, 0); }
  47   static void set_rounding_mode(const rounding_mode mode)
  48   { _control87(mode, 0xffff); }
  49   static double to_int(const double& x) { return rint(x); }
  50 };
  51
  52 } // namespace detail
  53 } // namespace interval_lib
  54 } // namespace numeric
  55 } // namespace boost
  56
  57 #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP */