ceph/src/boost/libs/numeric/interval/include/boost/numeric/interval/detail/ia64_rounding_control.hpp

   1 /* Boost interval/detail/ia64_rounding_control.hpp file
   2  *
   3  * Copyright 2006-2007 Boris Gubenko
   4  *
   5  * Distributed under the Boost Software License, Version 1.0.
   6  * (See accompanying file LICENSE_1_0.txt or
   7  * copy at http://www.boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP
  11 #define BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP
  12
  13 #if !defined(ia64) && !defined(__ia64) && !defined(__ia64__)
  14 #error This header only works on ia64 CPUs.
  15 #endif
  16
  17 #if defined(__hpux)
  18
  19 #   include <fenv.h>
  20
  21 namespace boost {
  22 namespace numeric {
  23 namespace interval_lib {
  24 namespace detail {
  25
  26
  27     struct ia64_rounding_control
  28     {
  29     typedef unsigned int rounding_mode;
  30
  31     static void set_rounding_mode(const rounding_mode& mode)  {
  32 fesetround(mode); }
  33     static void get_rounding_mode(rounding_mode& mode)  { mode = fegetround(); }
  34
  35     static void downward()    { set_rounding_mode(FE_DOWNWARD); }
  36     static void upward()      { set_rounding_mode(FE_UPWARD); }
  37     static void to_nearest()  { set_rounding_mode(FE_TONEAREST); }
  38     static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); }
  39     };
  40
  41 } // namespace detail
  42
  43 extern "C" {
  44   float rintf(float);
  45   double rint(double);
  46   long double rintl(long double);
  47 }
  48
  49 template<>
  50 struct rounding_control<float>:
  51   detail::ia64_rounding_control
  52 {
  53   static float force_rounding(const float r)
  54   { volatile float _r = r; return _r; }
  55   static float to_int(const float& x) { return rintf(x); }
  56 };
  57
  58 template<>
  59 struct rounding_control<double>:
  60   detail::ia64_rounding_control
  61 {
  62   static const double & force_rounding(const double& r) { return r; }
  63   static double to_int(const double& r) { return rint(r); }
  64 };
  65
  66 template<>
  67 struct rounding_control<long double>:
  68   detail::ia64_rounding_control
  69 {
  70   static const long double & force_rounding(const long double& r) { return r; }
  71   static long double to_int(const long double& r) { return rintl(r); }
  72 };
  73
  74 } // namespace interval_lib
  75 } // namespace numeric
  76 } // namespace boost
  77
  78 #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
  79
  80 #endif /* __hpux */
  81
  82 #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP */
  83