diff options
Diffstat (limited to 'gsl-1.9/ieee-utils/fp-aix.c')
-rw-r--r-- | gsl-1.9/ieee-utils/fp-aix.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/fp-aix.c b/gsl-1.9/ieee-utils/fp-aix.c new file mode 100644 index 0000000..9933f8f --- /dev/null +++ b/gsl-1.9/ieee-utils/fp-aix.c @@ -0,0 +1,120 @@ +/* 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 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 <math.h> +#include <fptrap.h> +#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) +{ + 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 ; + +} |