diff options
Diffstat (limited to 'gsl-1.9/ieee-utils/fp-darwin.c')
-rw-r--r-- | gsl-1.9/ieee-utils/fp-darwin.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/fp-darwin.c b/gsl-1.9/ieee-utils/fp-darwin.c new file mode 100644 index 0000000..c06a8a6 --- /dev/null +++ b/gsl-1.9/ieee-utils/fp-darwin.c @@ -0,0 +1,95 @@ +/* ieee-utils/fp-darwin.c + * + * Copyright (C) 2001 Rodney Sparapani <rsparapa@mcw.edu> + * + * 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 <architecture/ppc/fp_regs.h> +#include <gsl/gsl_ieee_utils.h> +#include <gsl/gsl_errno.h> + +int +gsl_ieee_set_mode (int precision, int rounding, int exception_mask) +{ + ppc_fp_scr_t fp_scr = get_fp_scr() ; + + 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: + fp_scr.rn = RN_NEAREST ; + break ; + case GSL_IEEE_ROUND_DOWN: + fp_scr.rn = RN_TOWARD_MINUS ; + break ; + case GSL_IEEE_ROUND_UP: + fp_scr.rn = RN_TOWARD_PLUS ; + break ; + case GSL_IEEE_ROUND_TO_ZERO: + fp_scr.rn = RN_TOWARD_ZERO ; + break ; + default: + fp_scr.rn = RN_NEAREST ; + } + + if (exception_mask & GSL_IEEE_MASK_INVALID) + fp_scr.ve = 0 ; //ve bit: invalid op exception enable + + 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) + fp_scr.ze = 0 ; //ze bit: zero divide exception enable + + if (exception_mask & GSL_IEEE_MASK_OVERFLOW) + fp_scr.oe = 0 ; //oe bit: overflow exception enable + + if (exception_mask & GSL_IEEE_MASK_UNDERFLOW) + fp_scr.ue = 0 ; //ue bit: underflow exception enable + + if (exception_mask & GSL_IEEE_TRAP_INEXACT) + { + fp_scr.xe = 1 ; //xe bit: inexact exception enable + } + else + { + fp_scr.xe = 01 ; + } + + set_fp_scr(fp_scr); + + return GSL_SUCCESS ; + +} |