ceph/src/boost/boost/numeric/interval/detail/sparc_rounding_control.hpp

   1 /* Boost interval/detail/sparc_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  * The basic code in this file was kindly provided by Jeremy Siek.
  11  */
  12
  13 #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
  14 #define BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
  15
  16 #if !defined(sparc) && !defined(__sparc__)
  17 #  error This header is only intended for SPARC CPUs.
  18 #endif
  19
  20 #ifdef __SUNPRO_CC
  21 #  include <ieeefp.h>
  22 #endif
  23
  24
  25 namespace boost {
  26 namespace numeric {
  27 namespace interval_lib {
  28 namespace detail {
  29
  30 struct sparc_rounding_control
  31 {
  32   typedef unsigned int rounding_mode;
  33
  34   static void set_rounding_mode(const rounding_mode& mode)
  35   {
  36 #   if defined(__GNUC__)
  37     __asm__ __volatile__("ld %0, %%fsr" : : "m"(mode));
  38 #   elif defined (__SUNPRO_CC)
  39     fpsetround(fp_rnd(mode));
  40 #   elif defined(__KCC)
  41     asm("sethi %hi(mode), %o1");
  42     asm("ld [%o1+%lo(mode)], %fsr");
  43 #   else
  44 #     error Unsupported compiler for Sparc rounding control.
  45 #   endif
  46   }
  47
  48   static void get_rounding_mode(rounding_mode& mode)
  49   {
  50 #   if defined(__GNUC__)
  51     __asm__ __volatile__("st %%fsr, %0" : "=m"(mode));
  52 #   elif defined (__SUNPRO_CC)
  53     mode = fpgetround();
  54 #   elif defined(__KCC)
  55 #     error KCC on Sun SPARC get_round_mode: please fix me
  56     asm("st %fsr, [mode]");
  57 #   else
  58 #     error Unsupported compiler for Sparc rounding control.
  59 #   endif
  60   }
  61
  62 #if defined(__SUNPRO_CC)
  63   static void downward()    { set_rounding_mode(FP_RM); }
  64   static void upward()      { set_rounding_mode(FP_RP); }
  65   static void to_nearest()  { set_rounding_mode(FP_RN); }
  66   static void toward_zero() { set_rounding_mode(FP_RZ); }
  67 #else
  68   static void downward()    { set_rounding_mode(0xc0000000); }
  69   static void upward()      { set_rounding_mode(0x80000000); }
  70   static void to_nearest()  { set_rounding_mode(0x00000000); }
  71   static void toward_zero() { set_rounding_mode(0x40000000); }
  72 #endif
  73 };
  74
  75 } // namespace detail
  76
  77 extern "C" {
  78   float rintf(float);
  79   double rint(double);
  80 }
  81
  82 template<>
  83 struct rounding_control<float>:
  84   detail::sparc_rounding_control
  85 {
  86   static const float& force_rounding(const float& x) { return x; }
  87   static float to_int(const float& x) { return rintf(x); }
  88 };
  89
  90 template<>
  91 struct rounding_control<double>:
  92   detail::sparc_rounding_control
  93 {
  94   static const double& force_rounding(const double& x) { return x; }
  95   static double to_int(const double& x) { return rint(x); }
  96 };
  97
  98 template<>
  99 struct rounding_control<long double>:
 100   detail::sparc_rounding_control
 101 {
 102   static const long double& force_rounding(const long double& x) { return x; }
 103   static long double to_int(const long double& x) { return rint(x); }
 104 };
 105
 106 } // namespace interval_lib
 107 } // namespace numeric
 108 } // namespace boost
 109
 110 #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
 111
 112 #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP */