| /* 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 ; |
| |
| } |