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8a1af320 | 1 | /* GCC Quad-Precision Math Library |
1b78544f | 2 | Copyright (C) 2012 Free Software Foundation, Inc. |
8a1af320 L |
3 | |
4 | This file is part of the libquadmath library. | |
5 | Libquadmath is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2 of the License, or (at your option) any later version. | |
9 | ||
10 | Libquadmath is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with libquadmath; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, | |
18 | Boston, MA 02110-1301, USA. */ | |
19 | ||
20 | ||
21 | #ifndef QUADMATH_ROUNDING_MODE_H | |
22 | #define QUADMATH_ROUNDING_MODE_H | |
23 | ||
24 | #include <stdbool.h> | |
25 | ||
26 | ||
27 | #if defined(HAVE_FENV_H) | |
28 | # include <fenv.h> | |
29 | #endif /* HAVE_FENV_H */ | |
30 | ||
31 | static inline int | |
32 | get_rounding_mode (void) | |
33 | { | |
34 | #if defined(HAVE_FENV_H) && (defined(FE_DOWNWARD) || defined(FE_TONEAREST) \ | |
35 | || defined(FE_TOWARDZERO) || defined(FE_UPWARD)) | |
1773438a | 36 | return fegetround (); |
8a1af320 L |
37 | #else |
38 | return 0; | |
39 | #endif | |
40 | } | |
41 | ||
42 | static inline bool | |
43 | round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits, | |
44 | int mode) | |
45 | { | |
46 | switch (mode) | |
47 | { | |
48 | #ifdef FE_DOWNWARD | |
49 | case FE_DOWNWARD: | |
50 | return negative && (half_bit || more_bits); | |
51 | #endif | |
52 | ||
53 | #ifdef FE_DOWNWARD | |
54 | case FE_TONEAREST: | |
55 | return half_bit && (last_digit_odd || more_bits); | |
56 | #endif | |
57 | ||
58 | #ifdef FE_TOWARDZERO | |
59 | case FE_TOWARDZERO: | |
60 | return false; | |
61 | #endif | |
62 | ||
63 | ||
64 | #ifdef FE_UPWARD | |
65 | case FE_UPWARD: | |
66 | return !negative && (half_bit || more_bits); | |
67 | #endif | |
68 | ||
69 | default: | |
70 | return false; | |
71 | } | |
72 | } | |
73 | ||
74 | #endif /* QUADMATH_ROUNDING_MODE_H */ |