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/* Internal testing support for rounding for decimal float.
Copyright (C) 2005-2020 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;
}
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