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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 3 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_ieee_utils.h"
- #include "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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