projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |