diff options
Diffstat (limited to 'gsl-1.9/ieee-utils/fp-gnuc99.c')
-rw-r--r-- | gsl-1.9/ieee-utils/fp-gnuc99.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/fp-gnuc99.c b/gsl-1.9/ieee-utils/fp-gnuc99.c new file mode 100644 index 0000000..93a8e0a --- /dev/null +++ b/gsl-1.9/ieee-utils/fp-gnuc99.c @@ -0,0 +1,182 @@ +/* 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 ; +} |