| /* Internal testing support for rounding for decimal float. |
| |
| Copyright (C) 2005-2017 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| License for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "dconfig.h" |
| #include "decContext.h" |
| #include "decRound.h" |
| |
| /* Internal, non-documented functions for testing libgcc functions. |
| This support is not sufficient for application use. */ |
| |
| #define FE_DEC_DOWNWARD 0 |
| #define FE_DEC_TONEAREST 1 |
| #define FE_DEC_TONEARESTFROMZERO 2 |
| #define FE_DEC_TOWARDZERO 3 |
| #define FE_DEC_UPWARD 4 |
| #define FE_DEC_MAX 5 |
| |
| static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; |
| |
| /* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */ |
| |
| void |
| __dfp_set_round (int mode) |
| { |
| switch (mode) |
| { |
| case FE_DEC_DOWNWARD: |
| __dfp_rounding_mode = DEC_ROUND_FLOOR; break; |
| case FE_DEC_TONEAREST: |
| __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break; |
| case FE_DEC_TONEARESTFROMZERO: |
| __dfp_rounding_mode = DEC_ROUND_HALF_UP; break; |
| case FE_DEC_TOWARDZERO: |
| __dfp_rounding_mode = DEC_ROUND_DOWN; break; |
| case FE_DEC_UPWARD: |
| __dfp_rounding_mode = DEC_ROUND_CEILING; break; |
| default: |
| /* We can't use assert in libgcc, so just return the default mode. */ |
| __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break; |
| } |
| } |
| |
| /* Return the decNumber rounding mode as an FE_DEC_* value. */ |
| |
| int |
| __dfp_get_round (void) |
| { |
| int mode; |
| |
| switch (__dfp_rounding_mode) |
| { |
| case DEC_ROUND_FLOOR: |
| mode = FE_DEC_DOWNWARD; break; |
| case DEC_ROUND_HALF_EVEN: |
| mode = FE_DEC_TONEAREST; break; |
| case DEC_ROUND_HALF_UP: |
| mode = FE_DEC_TONEARESTFROMZERO; break; |
| case DEC_ROUND_DOWN: |
| mode = FE_DEC_TOWARDZERO; break; |
| case DEC_ROUND_CEILING: |
| mode = FE_DEC_UPWARD; break; |
| default: |
| /* We shouldn't get here, but can't use assert in libgcc. */ |
| mode = -1; |
| } |
| return mode; |
| } |
| |
| /* Return the decNumber version of the current rounding mode. */ |
| |
| enum rounding |
| __decGetRound (void) |
| { |
| return __dfp_rounding_mode; |
| } |