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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 |