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