1 /* ieee-utils/fp-gnum68k.c
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
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.
21 #include <fpu_control.h>
22 #include <gsl/gsl_errno.h>
23 #include <gsl/gsl_ieee_utils.h>
26 gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
28 unsigned short mode = 0 ;
32 case GSL_IEEE_SINGLE_PRECISION:
35 case GSL_IEEE_DOUBLE_PRECISION:
38 case GSL_IEEE_EXTENDED_PRECISION:
39 mode |= _FPU_EXTENDED ;
42 mode |= _FPU_EXTENDED ;
47 case GSL_IEEE_ROUND_TO_NEAREST:
48 mode |= _FPU_RC_NEAREST ;
50 case GSL_IEEE_ROUND_DOWN:
51 mode |= _FPU_RC_DOWN ;
53 case GSL_IEEE_ROUND_UP:
56 case GSL_IEEE_ROUND_TO_ZERO:
57 mode |= _FPU_RC_ZERO ;
60 mode |= _FPU_RC_NEAREST ;
63 /* FIXME: I don't have documentation for the M68K so I'm not sure
64 about the mapping of the exceptions below. Maybe someone who does
65 know could correct this. */
67 if (exception_mask & GSL_IEEE_MASK_INVALID)
68 mode |= _FPU_MASK_OPERR ;
70 if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
76 GSL_ERROR ("the denormalized operand exception has not been implemented for m68k yet. Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
77 /*mode |= _FPU_MASK_DM ; ???? */
80 if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
81 mode |= _FPU_MASK_DZ ;
83 if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
84 mode |= _FPU_MASK_OVFL ;
86 if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
87 mode |= _FPU_MASK_UNFL ;
89 if (exception_mask & GSL_IEEE_TRAP_INEXACT)
91 mode &= ~ (_FPU_MASK_INEX1 | _FPU_MASK_INEX2) ;
95 mode |= (_FPU_MASK_INEX1 | _FPU_MASK_INEX2) ;