1 | /* Boost interval/detail/sparc_rounding_control.hpp file |
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2 | * |
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3 | * Copyright 2000 Jens Maurer |
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4 | * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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5 | * |
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6 | * Distributed under the Boost Software License, Version 1.0. |
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7 | * (See accompanying file LICENSE_1_0.txt or |
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8 | * copy at http://www.boost.org/LICENSE_1_0.txt) |
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9 | * |
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10 | * The basic code in this file was kindly provided by Jeremy Siek. |
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11 | */ |
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12 | |
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13 | #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP |
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14 | #define BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP |
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15 | |
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16 | #if !defined(sparc) && !defined(__sparc__) |
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17 | # error This header is only intended for SPARC CPUs. |
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18 | #endif |
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19 | |
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20 | #ifdef __SUNPRO_CC |
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21 | # include <ieeefp.h> |
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22 | #endif |
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23 | |
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24 | |
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25 | namespace boost { |
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26 | namespace numeric { |
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27 | namespace interval_lib { |
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28 | namespace detail { |
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29 | |
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30 | struct sparc_rounding_control |
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31 | { |
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32 | typedef unsigned int rounding_mode; |
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33 | |
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34 | static void set_rounding_mode(const rounding_mode& mode) |
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35 | { |
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36 | # if defined(__GNUC__) |
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37 | __asm__ __volatile__("ld %0, %%fsr" : : "m"(mode)); |
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38 | # elif defined (__SUNPRO_CC) |
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39 | fpsetround(fp_rnd(mode)); |
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40 | # elif defined(__KCC) |
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41 | asm("sethi %hi(mode), %o1"); |
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42 | asm("ld [%o1+%lo(mode)], %fsr"); |
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43 | # else |
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44 | # error Unsupported compiler for Sparc rounding control. |
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45 | # endif |
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46 | } |
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47 | |
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48 | static void get_rounding_mode(rounding_mode& mode) |
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49 | { |
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50 | # if defined(__GNUC__) |
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51 | __asm__ __volatile__("st %%fsr, %0" : "=m"(mode)); |
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52 | # elif defined (__SUNPRO_CC) |
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53 | mode = fpgetround(); |
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54 | # elif defined(__KCC) |
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55 | # error KCC on Sun SPARC get_round_mode: please fix me |
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56 | asm("st %fsr, [mode]"); |
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57 | # else |
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58 | # error Unsupported compiler for Sparc rounding control. |
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59 | # endif |
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60 | } |
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61 | |
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62 | #if defined(__SUNPRO_CC) |
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63 | static void downward() { set_rounding_mode(FP_RM); } |
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64 | static void upward() { set_rounding_mode(FP_RP); } |
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65 | static void to_nearest() { set_rounding_mode(FP_RN); } |
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66 | static void toward_zero() { set_rounding_mode(FP_RZ); } |
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67 | #else |
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68 | static void downward() { set_rounding_mode(0xc0000000); } |
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69 | static void upward() { set_rounding_mode(0x80000000); } |
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70 | static void to_nearest() { set_rounding_mode(0x00000000); } |
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71 | static void toward_zero() { set_rounding_mode(0x40000000); } |
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72 | #endif |
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73 | }; |
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74 | |
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75 | } // namespace detail |
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76 | |
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77 | extern "C" { |
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78 | float rintf(float); |
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79 | double rint(double); |
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80 | } |
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81 | |
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82 | template<> |
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83 | struct rounding_control<float>: |
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84 | detail::sparc_rounding_control |
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85 | { |
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86 | static const float& force_rounding(const float& x) { return x; } |
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87 | static float to_int(const float& x) { return rintf(x); } |
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88 | }; |
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89 | |
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90 | template<> |
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91 | struct rounding_control<double>: |
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92 | detail::sparc_rounding_control |
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93 | { |
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94 | static const double& force_rounding(const double& x) { return x; } |
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95 | static double to_int(const double& x) { return rint(x); } |
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96 | }; |
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97 | |
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98 | template<> |
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99 | struct rounding_control<long double>: |
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100 | detail::sparc_rounding_control |
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101 | { |
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102 | static const long double& force_rounding(const long double& x) { return x; } |
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103 | static long double to_int(const long double& x) { return rint(x); } |
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104 | }; |
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105 | |
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106 | } // namespace interval_lib |
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107 | } // namespace numeric |
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108 | } // namespace boost |
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109 | |
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110 | #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE |
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111 | |
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112 | #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP */ |
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