/* Temporary support for a libc-like fp environment for decimal float. Copyright (C) 2005 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 2, 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. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include "decContext.h" #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 extern void __dfp_set_round (int); extern int __dfp_get_round (void); extern enum rounding __decGetRound (void); /* FIXME: these should be in thread-local storage for runtime support. */ 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; }