103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/* Temporary support for a libc-like fp environment for decimal float.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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In addition to the permissions in the GNU General Public License,
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the Free Software Foundation gives you unlimited permission to link
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the compiled version of this file into combinations with other
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programs, and to distribute those combinations without any
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restriction coming from the use of this file. (The General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into a combine executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include "decContext.h"
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#define FE_DEC_DOWNWARD 0
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#define FE_DEC_TONEAREST 1
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#define FE_DEC_TONEARESTFROMZERO 2
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#define FE_DEC_TOWARDZERO 3
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#define FE_DEC_UPWARD 4
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#define FE_DEC_MAX 5
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extern void __dfp_set_round (int);
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extern int __dfp_get_round (void);
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extern enum rounding __decGetRound (void);
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/* FIXME: these should be in thread-local storage for runtime support. */
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static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN;
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/* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */
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void
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__dfp_set_round (int mode)
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{
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switch (mode)
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{
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case FE_DEC_DOWNWARD:
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__dfp_rounding_mode = DEC_ROUND_FLOOR; break;
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case FE_DEC_TONEAREST:
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__dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
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case FE_DEC_TONEARESTFROMZERO:
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__dfp_rounding_mode = DEC_ROUND_HALF_UP; break;
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case FE_DEC_TOWARDZERO:
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__dfp_rounding_mode = DEC_ROUND_DOWN; break;
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case FE_DEC_UPWARD:
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__dfp_rounding_mode = DEC_ROUND_CEILING; break;
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default:
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/* We can't use assert in libgcc, so just return the default mode. */
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__dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
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}
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}
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/* Return the decNumber rounding mode as an FE_DEC_* value. */
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int
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__dfp_get_round (void)
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{
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int mode;
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switch (__dfp_rounding_mode)
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{
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case DEC_ROUND_FLOOR:
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mode = FE_DEC_DOWNWARD; break;
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case DEC_ROUND_HALF_EVEN:
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mode = FE_DEC_TONEAREST; break;
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case DEC_ROUND_HALF_UP:
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mode = FE_DEC_TONEARESTFROMZERO; break;
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case DEC_ROUND_DOWN:
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mode = FE_DEC_TOWARDZERO; break;
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case DEC_ROUND_CEILING:
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mode = FE_DEC_UPWARD; break;
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default:
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/* We shouldn't get here, but can't use assert in libgcc. */
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mode = -1;
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}
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return mode;
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}
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/* Return the decNumber version of the current rounding mode. */
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enum rounding
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__decGetRound (void)
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{
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return __dfp_rounding_mode;
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}
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