diff options
Diffstat (limited to 'gsl-1.9/ieee-utils/fp-gnuppc.c')
-rw-r--r-- | gsl-1.9/ieee-utils/fp-gnuppc.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/fp-gnuppc.c b/gsl-1.9/ieee-utils/fp-gnuppc.c new file mode 100644 index 0000000..161c5b3 --- /dev/null +++ b/gsl-1.9/ieee-utils/fp-gnuppc.c @@ -0,0 +1,98 @@ +/* ieee-utils/fp-gnuppc.c + * + * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough, John Fisher + * + * 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 <stdio.h> +#include <fpu_control.h> +#include <gsl/gsl_errno.h> +#include <gsl/gsl_ieee_utils.h> + + +/* + * Identical to fp-gnux86.c, except with references to + * _FPU_SINGLE, _FPU_DOUBLE, _FPU_EXTENDED, _FPU_MASK_DM + * and _FPU_MASK_PM converted to errors. + */ + +int +gsl_ieee_set_mode (int precision, int rounding, int exception_mask) +{ + unsigned short mode = 0 ; + + switch (precision) + { + case GSL_IEEE_SINGLE_PRECISION: + GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP); + break ; + case GSL_IEEE_DOUBLE_PRECISION: + GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP); + break ; + case GSL_IEEE_EXTENDED_PRECISION: + GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP); + break ; + } + + switch (rounding) + { + case GSL_IEEE_ROUND_TO_NEAREST: + mode |= _FPU_RC_NEAREST ; + break ; + case GSL_IEEE_ROUND_DOWN: + mode |= _FPU_RC_DOWN ; + break ; + case GSL_IEEE_ROUND_UP: + mode |= _FPU_RC_UP ; + break ; + case GSL_IEEE_ROUND_TO_ZERO: + mode |= _FPU_RC_ZERO ; + break ; + default: + mode |= _FPU_RC_NEAREST ; + } + + if (exception_mask & GSL_IEEE_MASK_INVALID) + mode |= _FPU_MASK_IM ; + + if (exception_mask & GSL_IEEE_MASK_DENORMALIZED) + { + /* do nothing */ + } + else + { + GSL_ERROR ("powerpc 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 |= _FPU_MASK_ZM ; + + if (exception_mask & GSL_IEEE_MASK_OVERFLOW) + mode |= _FPU_MASK_OM ; + + if (exception_mask & GSL_IEEE_MASK_UNDERFLOW) + mode |= _FPU_MASK_UM ; + + if (exception_mask & GSL_IEEE_TRAP_INEXACT) + { + GSL_ERROR ("powerpc does not support traps for inexact operations", GSL_EUNSUP) ; + } + + _FPU_SETCW(mode) ; + + return GSL_SUCCESS ; +} |