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/* ieee-utils/fp-os2.c
*
* Copyright (C) 2001 Henry Sobotka <sobotka@axess.com>
*
* This program 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 of the License, or (at
* your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <float.h>
#include <gsl/gsl_ieee_utils.h>
#include <gsl/gsl_errno.h>
int
gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
{
unsigned mode = 0;
switch (precision)
{
case GSL_IEEE_SINGLE_PRECISION:
_control87(PC_24, MCW_PC);
break ;
case GSL_IEEE_DOUBLE_PRECISION:
_control87(PC_53, MCW_PC);
break ;
case GSL_IEEE_EXTENDED_PRECISION:
_control87(PC_64, MCW_PC);
break ;
}
switch (rounding)
{
case GSL_IEEE_ROUND_TO_NEAREST:
_control87(RC_NEAR, MCW_RC);
break ;
case GSL_IEEE_ROUND_DOWN:
_control87(RC_DOWN, MCW_RC);
break ;
case GSL_IEEE_ROUND_UP:
_control87(RC_UP, MCW_RC);
break ;
case GSL_IEEE_ROUND_TO_ZERO:
_control87(RC_CHOP, MCW_RC);
break ;
default:
_control87(RC_NEAR, MCW_RC);
}
/* Turn on all the exceptions apart from 'inexact' */
mode = EM_INVALID | EM_DENORMAL | EM_ZERODIVIDE | EM_OVERFLOW | EM_UNDERFLOW;
if (exception_mask & GSL_IEEE_MASK_INVALID)
mode &= ~ EM_INVALID;
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
mode &= ~ EM_DENORMAL;
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
mode &= ~ EM_ZERODIVIDE;
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
mode &= ~ EM_OVERFLOW;
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
mode &= ~ EM_UNDERFLOW;
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
{
mode |= EM_INEXACT;
}
else
{
mode &= ~ EM_INEXACT;
}
_control87(mode, MCW_EM);
return GSL_SUCCESS ;
}
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