| /* ieee-utils/fp-gnuc99.c |
| * |
| * Copyright (C) 2003, 2004 Brian Gough |
| * |
| * 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. |
| */ |
| |
| #define _GNU_SOURCE 1 |
| |
| #include <math.h> |
| #include <stdio.h> |
| #include <fenv.h> |
| #include <gsl/gsl_ieee_utils.h> |
| #include <gsl/gsl_errno.h> |
| |
| int |
| gsl_ieee_set_mode (int precision, int rounding, int exception_mask) |
| { |
| int mode; |
| |
| switch (precision) |
| { |
| case GSL_IEEE_SINGLE_PRECISION: |
| GSL_ERROR ("single precision rounding is not supported by <fenv.h>", |
| GSL_EUNSUP) ; |
| break ; |
| case GSL_IEEE_DOUBLE_PRECISION: |
| GSL_ERROR ("double precision rounding is not supported by <fenv.h>", |
| GSL_EUNSUP) ; |
| break ; |
| case GSL_IEEE_EXTENDED_PRECISION: |
| GSL_ERROR ("extended precision rounding is not supported by <fenv.h>", |
| GSL_EUNSUP) ; |
| break ; |
| } |
| |
| |
| switch (rounding) |
| { |
| case GSL_IEEE_ROUND_TO_NEAREST: |
| #ifdef FE_TONEAREST |
| fesetround (FE_TONEAREST) ; |
| #else |
| GSL_ERROR ("round-to-nearest is not supported by <fenv.h>", GSL_EUNSUP) ; |
| #endif |
| break ; |
| case GSL_IEEE_ROUND_DOWN: |
| #ifdef FE_DOWNWARD |
| fesetround (FE_DOWNWARD) ; |
| #else |
| GSL_ERROR ("round-down is not supported by <fenv.h>", GSL_EUNSUP) ; |
| #endif |
| break ; |
| case GSL_IEEE_ROUND_UP: |
| #ifdef FE_UPWARD |
| fesetround (FE_UPWARD) ; |
| #else |
| GSL_ERROR ("round-up is not supported by <fenv.h>", GSL_EUNSUP) ; |
| #endif |
| break ; |
| case GSL_IEEE_ROUND_TO_ZERO: |
| #ifdef FE_TOWARDZERO |
| fesetround (FE_TOWARDZERO) ; |
| #else |
| GSL_ERROR ("round-toward-zero is not supported by <fenv.h>", GSL_EUNSUP) ; |
| #endif |
| break ; |
| default: |
| #ifdef FE_TONEAREST |
| fesetround (FE_TONEAREST) ; |
| #else |
| GSL_ERROR ("default round-to-nearest mode is not supported by <fenv.h>", GSL_EUNSUP) ; |
| #endif |
| } |
| |
| /* Turn on all the exceptions apart from 'inexact' */ |
| |
| mode = 0; |
| |
| #ifdef FE_INVALID |
| mode |= FE_INVALID; |
| #endif |
| |
| #ifdef FE_DIVBYZERO |
| mode |= FE_DIVBYZERO; |
| #endif |
| |
| #ifdef FE_OVERFLOW |
| mode |= FE_OVERFLOW ; |
| #endif |
| |
| #ifdef FE_UNDERFLOW |
| mode |= FE_UNDERFLOW ; |
| #endif |
| |
| if (exception_mask & GSL_IEEE_MASK_INVALID) |
| { |
| #ifdef FE_INVALID |
| mode &= ~ FE_INVALID ; |
| #else |
| GSL_ERROR ("invalid operation exception not supported by <fenv.h>", |
| GSL_EUNSUP); |
| #endif |
| } |
| |
| if (exception_mask & GSL_IEEE_MASK_DENORMALIZED) |
| { |
| /* do nothing */ |
| } |
| else |
| { |
| GSL_ERROR ("denormalized operand exception not supported by <fenv.h>. " |
| "Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ; |
| } |
| |
| if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO) |
| { |
| #ifdef FE_DIVBYZERO |
| mode &= ~ FE_DIVBYZERO ; |
| #else |
| GSL_ERROR ("division by zero exception not supported by <fenv.h>", |
| GSL_EUNSUP); |
| #endif |
| } |
| |
| if (exception_mask & GSL_IEEE_MASK_OVERFLOW) |
| { |
| #ifdef FE_OVERFLOW |
| mode &= ~ FE_OVERFLOW ; |
| #else |
| GSL_ERROR ("overflow exception not supported by <fenv.h>", GSL_EUNSUP); |
| #endif |
| } |
| |
| if (exception_mask & GSL_IEEE_MASK_UNDERFLOW) |
| { |
| #ifdef FE_UNDERFLOW |
| mode &= ~ FE_UNDERFLOW ; |
| #else |
| GSL_ERROR ("underflow exception not supported by <fenv.h>", GSL_EUNSUP); |
| #endif |
| } |
| |
| if (exception_mask & GSL_IEEE_TRAP_INEXACT) |
| { |
| #ifdef FE_INEXACT |
| mode |= FE_INEXACT ; |
| #else |
| GSL_ERROR ("inexact exception not supported by <fenv.h>", GSL_EUNSUP); |
| #endif |
| } |
| else |
| { |
| #ifdef FE_INEXACT |
| mode &= ~ FE_INEXACT ; |
| #else |
| /* do nothing */ |
| #endif |
| } |
| |
| #if HAVE_DECL_FEENABLEEXCEPT |
| feenableexcept (mode) ; |
| #elif HAVE_DECL_FESETTRAPENABLE |
| fesettrapenable (mode); |
| #else |
| GSL_ERROR ("unknown exception trap method", GSL_EUNSUP) |
| #endif |
| |
| return GSL_SUCCESS ; |
| } |