| /* 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 ; |
| |
| } |