123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102 |
- /* ieee-utils/fp-gnum68k.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
- *
- * 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 3 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_errno.h"
- #include "gsl_ieee_utils.h"
- int
- gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
- {
- unsigned short mode = 0 ;
- switch (precision)
- {
- case GSL_IEEE_SINGLE_PRECISION:
- mode |= _FPU_SINGLE ;
- break ;
- case GSL_IEEE_DOUBLE_PRECISION:
- mode |= _FPU_DOUBLE ;
- break ;
- case GSL_IEEE_EXTENDED_PRECISION:
- mode |= _FPU_EXTENDED ;
- break ;
- default:
- mode |= _FPU_EXTENDED ;
- }
- 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 ;
- }
- /* FIXME: I don't have documentation for the M68K so I'm not sure
- about the mapping of the exceptions below. Maybe someone who does
- know could correct this. */
- if (exception_mask & GSL_IEEE_MASK_INVALID)
- mode |= _FPU_MASK_OPERR ;
-
- if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
- {
- /* do nothing */
- }
- else
- {
- GSL_ERROR ("the denormalized operand exception has not been implemented for m68k yet. Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
- /*mode |= _FPU_MASK_DM ; ???? */
- }
-
- if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
- mode |= _FPU_MASK_DZ ;
- if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
- mode |= _FPU_MASK_OVFL ;
- if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
- mode |= _FPU_MASK_UNFL ;
- if (exception_mask & GSL_IEEE_TRAP_INEXACT)
- {
- mode &= ~ (_FPU_MASK_INEX1 | _FPU_MASK_INEX2) ;
- }
- else
- {
- mode |= (_FPU_MASK_INEX1 | _FPU_MASK_INEX2) ;
- }
- _FPU_SETCW(mode) ;
- return GSL_SUCCESS ;
- }
|