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1 /* Internal testing support for rounding for decimal float.
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2
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111
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3 Copyright (C) 2005-2017 Free Software Foundation, Inc.
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0
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "dconfig.h"
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27 #include "decContext.h"
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28 #include "decRound.h"
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29
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30 /* Internal, non-documented functions for testing libgcc functions.
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31 This support is not sufficient for application use. */
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32
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33 #define FE_DEC_DOWNWARD 0
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34 #define FE_DEC_TONEAREST 1
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35 #define FE_DEC_TONEARESTFROMZERO 2
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36 #define FE_DEC_TOWARDZERO 3
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37 #define FE_DEC_UPWARD 4
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38 #define FE_DEC_MAX 5
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39
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40 static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN;
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41
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42 /* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */
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43
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44 void
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45 __dfp_set_round (int mode)
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46 {
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47 switch (mode)
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48 {
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49 case FE_DEC_DOWNWARD:
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50 __dfp_rounding_mode = DEC_ROUND_FLOOR; break;
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51 case FE_DEC_TONEAREST:
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52 __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
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53 case FE_DEC_TONEARESTFROMZERO:
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54 __dfp_rounding_mode = DEC_ROUND_HALF_UP; break;
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55 case FE_DEC_TOWARDZERO:
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56 __dfp_rounding_mode = DEC_ROUND_DOWN; break;
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57 case FE_DEC_UPWARD:
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58 __dfp_rounding_mode = DEC_ROUND_CEILING; break;
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59 default:
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60 /* We can't use assert in libgcc, so just return the default mode. */
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61 __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
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62 }
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63 }
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64
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65 /* Return the decNumber rounding mode as an FE_DEC_* value. */
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66
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67 int
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68 __dfp_get_round (void)
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69 {
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70 int mode;
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71
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72 switch (__dfp_rounding_mode)
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73 {
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74 case DEC_ROUND_FLOOR:
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75 mode = FE_DEC_DOWNWARD; break;
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76 case DEC_ROUND_HALF_EVEN:
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77 mode = FE_DEC_TONEAREST; break;
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78 case DEC_ROUND_HALF_UP:
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79 mode = FE_DEC_TONEARESTFROMZERO; break;
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80 case DEC_ROUND_DOWN:
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81 mode = FE_DEC_TOWARDZERO; break;
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82 case DEC_ROUND_CEILING:
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83 mode = FE_DEC_UPWARD; break;
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84 default:
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85 /* We shouldn't get here, but can't use assert in libgcc. */
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86 mode = -1;
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87 }
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88 return mode;
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89 }
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90
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91 /* Return the decNumber version of the current rounding mode. */
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92
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93 enum rounding
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94 __decGetRound (void)
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95 {
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96 return __dfp_rounding_mode;
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97 }
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