Mercurial > hg > CbC > CbC_gcc
comparison libquadmath/quadmath-rounding-mode.h @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 /* GCC Quad-Precision Math Library | |
2 Copyright (C) 2012 Free Software Foundation, Inc. | |
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)) | |
36 return fegetround (); | |
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 */ |