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- /* ieee-utils/fp-aix.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000 Tim Mooney
- *
- * 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 <math.h>
- #include <fptrap.h>
- #include <float.h>
- #include "gsl_ieee_utils.h"
- #include "gsl_errno.h"
- int
- gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
- {
- fptrap_t mode = 0 ;
- fprnd_t rnd = 0 ;
- switch (precision)
- {
- /* I'm not positive about AIX only supporting default precision rounding,
- * but this is the best assumption until it's proven otherwise. */
- case GSL_IEEE_SINGLE_PRECISION:
- GSL_ERROR ("AIX only supports default precision rounding",
- GSL_EUNSUP) ;
- break ;
- case GSL_IEEE_DOUBLE_PRECISION:
- GSL_ERROR ("AIX only supports default precision rounding",
- GSL_EUNSUP) ;
- break ;
- case GSL_IEEE_EXTENDED_PRECISION:
- GSL_ERROR ("AIX only supports default precision rounding",
- GSL_EUNSUP) ;
- break ;
- }
- switch (rounding)
- {
- case GSL_IEEE_ROUND_TO_NEAREST:
- rnd = FP_RND_RN ;
- fp_swap_rnd (rnd) ;
- break ;
- case GSL_IEEE_ROUND_DOWN:
- rnd = FP_RND_RM ;
- fp_swap_rnd (rnd) ;
- break ;
- case GSL_IEEE_ROUND_UP:
- rnd = FP_RND_RP ;
- fp_swap_rnd (rnd) ;
- break ;
- case GSL_IEEE_ROUND_TO_ZERO:
- rnd = FP_RND_RZ ;
- fp_swap_rnd (rnd) ;
- break ;
- default:
- rnd = FP_RND_RN ;
- fp_swap_rnd (rnd) ;
- }
- /* Turn on all the exceptions apart from 'inexact' */
- mode = TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW | TRP_UNDERFLOW ;
- if (exception_mask & GSL_IEEE_MASK_INVALID)
- mode &= ~ TRP_INVALID ;
- if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
- {
- /* do nothing */
- }
- else
- {
- GSL_ERROR ("AIX 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)
- mode &= ~ TRP_DIV_BY_ZERO ;
- if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
- mode &= ~ TRP_OVERFLOW ;
- if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
- mode &= ~ TRP_UNDERFLOW ;
- if (exception_mask & GSL_IEEE_TRAP_INEXACT)
- {
- mode |= TRP_INEXACT ;
- }
- else
- {
- mode &= ~ TRP_INEXACT ;
- }
- /* AIX appears to require two steps -- first enable floating point traps
- * in general... */
- fp_trap(FP_TRAP_SYNC);
- /* next, enable the traps we're interested in */
- fp_enable(mode);
- return GSL_SUCCESS ;
- }
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