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 */ |
---|