diff options
Diffstat (limited to 'gsl-1.9/ieee-utils/fp-netbsd.c')
-rw-r--r-- | gsl-1.9/ieee-utils/fp-netbsd.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/fp-netbsd.c b/gsl-1.9/ieee-utils/fp-netbsd.c new file mode 100644 index 0000000..6f8b138 --- /dev/null +++ b/gsl-1.9/ieee-utils/fp-netbsd.c @@ -0,0 +1,118 @@ +/* fp-netbsd.c + * + * Copyright (C) 2001 Jason Beegan + * + * 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 <ieeefp.h> +#include <gsl/gsl_ieee_utils.h> +#include <gsl/gsl_errno.h> + +int +gsl_ieee_set_mode (int precision, int rounding, int exception_mask) +{ + fp_except mode = 0; + fp_rnd rnd = 0; + + switch (precision) + { + case GSL_IEEE_SINGLE_PRECISION: + GSL_ERROR ("NetBSD only supports default precision rounding", + GSL_EUNSUP); + break; + case GSL_IEEE_DOUBLE_PRECISION: + GSL_ERROR ("NetBSD only supports default precision rounding", + GSL_EUNSUP); + break; + case GSL_IEEE_EXTENDED_PRECISION: + GSL_ERROR ("NetBSD only supports default precision rounding", + GSL_EUNSUP); + break; + } + + switch (rounding) + { + case GSL_IEEE_ROUND_TO_NEAREST: + rnd = FP_RN; + fpsetround (rnd); + break; + case GSL_IEEE_ROUND_DOWN: + rnd = FP_RM; + fpsetround (rnd); + break; + case GSL_IEEE_ROUND_UP: + rnd = FP_RP; + fpsetround (rnd); + break; + case GSL_IEEE_ROUND_TO_ZERO: + rnd = FP_RZ; + fpsetround (rnd); + break; + default: + rnd = FP_RN; + fpsetround (rnd); + } + +/* Turn on all available exceptions apart from 'inexact'. + Denormalized operand exception not available on all platforms. */ + + mode = FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL; +#ifdef FP_X_DNML + mode = mode | FP_X_DNML; +#endif + + if (exception_mask & GSL_IEEE_MASK_INVALID) + mode &= ~ FP_X_INV; + + if (exception_mask & GSL_IEEE_MASK_DENORMALIZED) + { +#ifdef FP_X_DNML + mode &= ~ FP_X_DNML; +#endif + } + else + { +#ifndef FP_X_DNML + GSL_ERROR ("NetBSD does not support the denormalized operand exception on this platform. " + "Use 'mask-denormalized' to work around this.", + GSL_EUNSUP); +#endif + } + + if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO) + mode &= ~ FP_X_DZ; + + if (exception_mask & GSL_IEEE_MASK_OVERFLOW) + mode &= ~ FP_X_OFL; + + if (exception_mask & GSL_IEEE_MASK_UNDERFLOW) + mode &= ~ FP_X_UFL; + + if (exception_mask & GSL_IEEE_TRAP_INEXACT) + { + mode |= FP_X_IMP; + } + else + { + mode &= ~ FP_X_IMP; + } + + fpsetmask (mode); + + return GSL_SUCCESS; + +} + |