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/* ieee-utils/fp-darwin.c
*
* Copyright (C) 2001 Rodney Sparapani <rsparapa@mcw.edu>
*
* 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 <architecture/ppc/fp_regs.h>
#include <gsl/gsl_ieee_utils.h>
#include <gsl/gsl_errno.h>
int
gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
{
ppc_fp_scr_t fp_scr = get_fp_scr() ;
switch (precision)
{
case GSL_IEEE_SINGLE_PRECISION:
GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
break ;
case GSL_IEEE_DOUBLE_PRECISION:
GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
break ;
case GSL_IEEE_EXTENDED_PRECISION:
GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
break ;
}
switch (rounding)
{
case GSL_IEEE_ROUND_TO_NEAREST:
fp_scr.rn = RN_NEAREST ;
break ;
case GSL_IEEE_ROUND_DOWN:
fp_scr.rn = RN_TOWARD_MINUS ;
break ;
case GSL_IEEE_ROUND_UP:
fp_scr.rn = RN_TOWARD_PLUS ;
break ;
case GSL_IEEE_ROUND_TO_ZERO:
fp_scr.rn = RN_TOWARD_ZERO ;
break ;
default:
fp_scr.rn = RN_NEAREST ;
}
if (exception_mask & GSL_IEEE_MASK_INVALID)
fp_scr.ve = 0 ; //ve bit: invalid op exception enable
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
{
/* do nothing */
}
else
{
GSL_ERROR ("powerpc does not support the denormalized operand exception. "
"Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
}
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
fp_scr.ze = 0 ; //ze bit: zero divide exception enable
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
fp_scr.oe = 0 ; //oe bit: overflow exception enable
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
fp_scr.ue = 0 ; //ue bit: underflow exception enable
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
{
fp_scr.xe = 1 ; //xe bit: inexact exception enable
}
else
{
fp_scr.xe = 01 ;
}
set_fp_scr(fp_scr);
return GSL_SUCCESS ;
}
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