| 1 | /* Internal testing support for rounding for decimal float. |
| 2 | |
| 3 | Copyright (C) 2005, 2006 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GCC. |
| 6 | |
| 7 | GCC is free software; you can redistribute it and/or modify it |
| 8 | under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | In addition to the permissions in the GNU General Public License, |
| 13 | the Free Software Foundation gives you unlimited permission to link |
| 14 | the compiled version of this file into combinations with other |
| 15 | programs, and to distribute those combinations without any |
| 16 | restriction coming from the use of this file. (The General Public |
| 17 | License restrictions do apply in other respects; for example, they |
| 18 | cover modification of the file, and distribution when not linked |
| 19 | into a combine executable.) |
| 20 | |
| 21 | GCC is distributed in the hope that it will be useful, but WITHOUT |
| 22 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 23 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 24 | License for more details. |
| 25 | |
| 26 | You should have received a copy of the GNU General Public License |
| 27 | along with GCC; see the file COPYING. If not, write to the Free |
| 28 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
| 29 | 02110-1301, USA. */ |
| 30 | |
| 31 | #include "config.h" |
| 32 | #include "decContext.h" |
| 33 | #include "decRound.h" |
| 34 | |
| 35 | /* Internal, non-documented functions for testing libgcc functions. |
| 36 | This support is not sufficient for application use. */ |
| 37 | |
| 38 | #define FE_DEC_DOWNWARD 0 |
| 39 | #define FE_DEC_TONEAREST 1 |
| 40 | #define FE_DEC_TONEARESTFROMZERO 2 |
| 41 | #define FE_DEC_TOWARDZERO 3 |
| 42 | #define FE_DEC_UPWARD 4 |
| 43 | #define FE_DEC_MAX 5 |
| 44 | |
| 45 | static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; |
| 46 | |
| 47 | /* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */ |
| 48 | |
| 49 | void |
| 50 | __dfp_set_round (int mode) |
| 51 | { |
| 52 | switch (mode) |
| 53 | { |
| 54 | case FE_DEC_DOWNWARD: |
| 55 | __dfp_rounding_mode = DEC_ROUND_FLOOR; break; |
| 56 | case FE_DEC_TONEAREST: |
| 57 | __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break; |
| 58 | case FE_DEC_TONEARESTFROMZERO: |
| 59 | __dfp_rounding_mode = DEC_ROUND_HALF_UP; break; |
| 60 | case FE_DEC_TOWARDZERO: |
| 61 | __dfp_rounding_mode = DEC_ROUND_DOWN; break; |
| 62 | case FE_DEC_UPWARD: |
| 63 | __dfp_rounding_mode = DEC_ROUND_CEILING; break; |
| 64 | default: |
| 65 | /* We can't use assert in libgcc, so just return the default mode. */ |
| 66 | __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /* Return the decNumber rounding mode as an FE_DEC_* value. */ |
| 71 | |
| 72 | int |
| 73 | __dfp_get_round (void) |
| 74 | { |
| 75 | int mode; |
| 76 | |
| 77 | switch (__dfp_rounding_mode) |
| 78 | { |
| 79 | case DEC_ROUND_FLOOR: |
| 80 | mode = FE_DEC_DOWNWARD; break; |
| 81 | case DEC_ROUND_HALF_EVEN: |
| 82 | mode = FE_DEC_TONEAREST; break; |
| 83 | case DEC_ROUND_HALF_UP: |
| 84 | mode = FE_DEC_TONEARESTFROMZERO; break; |
| 85 | case DEC_ROUND_DOWN: |
| 86 | mode = FE_DEC_TOWARDZERO; break; |
| 87 | case DEC_ROUND_CEILING: |
| 88 | mode = FE_DEC_UPWARD; break; |
| 89 | default: |
| 90 | /* We shouldn't get here, but can't use assert in libgcc. */ |
| 91 | mode = -1; |
| 92 | } |
| 93 | return mode; |
| 94 | } |
| 95 | |
| 96 | /* Return the decNumber version of the current rounding mode. */ |
| 97 | |
| 98 | enum rounding |
| 99 | __decGetRound (void) |
| 100 | { |
| 101 | return __dfp_rounding_mode; |
| 102 | } |