103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/* Internal testing support for rounding for decimal float.
|
|
|
|
Copyright (C) 2005, 2006 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.
|
|
|
|
In addition to the permissions in the GNU General Public License,
|
|
the Free Software Foundation gives you unlimited permission to link
|
|
the compiled version of this file into combinations with other
|
|
programs, and to distribute those combinations without any
|
|
restriction coming from the use of this file. (The General Public
|
|
License restrictions do apply in other respects; for example, they
|
|
cover modification of the file, and distribution when not linked
|
|
into a combine executable.)
|
|
|
|
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"
|
|
#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;
|
|
}
|