1 /* ieee-utils/fp-darwin.c
3 * Copyright (C) 2001 Rodney Sparapani <rsparapa@mcw.edu>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 #include <architecture/ppc/fp_regs.h>
21 #include <gsl/gsl_ieee_utils.h>
22 #include <gsl/gsl_errno.h>
25 gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
27 ppc_fp_scr_t fp_scr = get_fp_scr() ;
31 case GSL_IEEE_SINGLE_PRECISION:
32 GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
34 case GSL_IEEE_DOUBLE_PRECISION:
35 GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
37 case GSL_IEEE_EXTENDED_PRECISION:
38 GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
44 case GSL_IEEE_ROUND_TO_NEAREST:
45 fp_scr.rn = RN_NEAREST ;
47 case GSL_IEEE_ROUND_DOWN:
48 fp_scr.rn = RN_TOWARD_MINUS ;
50 case GSL_IEEE_ROUND_UP:
51 fp_scr.rn = RN_TOWARD_PLUS ;
53 case GSL_IEEE_ROUND_TO_ZERO:
54 fp_scr.rn = RN_TOWARD_ZERO ;
57 fp_scr.rn = RN_NEAREST ;
60 if (exception_mask & GSL_IEEE_MASK_INVALID)
61 fp_scr.ve = 0 ; //ve bit: invalid op exception enable
63 if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
69 GSL_ERROR ("powerpc does not support the denormalized operand exception. "
70 "Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
73 if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
74 fp_scr.ze = 0 ; //ze bit: zero divide exception enable
76 if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
77 fp_scr.oe = 0 ; //oe bit: overflow exception enable
79 if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
80 fp_scr.ue = 0 ; //ue bit: underflow exception enable
82 if (exception_mask & GSL_IEEE_TRAP_INEXACT)
84 fp_scr.xe = 1 ; //xe bit: inexact exception enable