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- /* ieee-utils/fp-gnuc99.c
- *
- * Copyright (C) 2003, 2004, 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.
- */
- #define _GNU_SOURCE 1
- #include <math.h>
- #include <stdio.h>
- #include <fenv.h>
- #include "gsl_ieee_utils.h"
- #include "gsl_errno.h"
- int
- gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
- {
- int mode;
- switch (precision)
- {
- case GSL_IEEE_SINGLE_PRECISION:
- GSL_ERROR ("single precision rounding is not supported by <fenv.h>",
- GSL_EUNSUP) ;
- break ;
- case GSL_IEEE_DOUBLE_PRECISION:
- GSL_ERROR ("double precision rounding is not supported by <fenv.h>",
- GSL_EUNSUP) ;
- break ;
- case GSL_IEEE_EXTENDED_PRECISION:
- GSL_ERROR ("extended precision rounding is not supported by <fenv.h>",
- GSL_EUNSUP) ;
- break ;
- }
- switch (rounding)
- {
- case GSL_IEEE_ROUND_TO_NEAREST:
- #ifdef FE_TONEAREST
- fesetround (FE_TONEAREST) ;
- #else
- GSL_ERROR ("round-to-nearest is not supported by <fenv.h>", GSL_EUNSUP) ;
- #endif
- break ;
- case GSL_IEEE_ROUND_DOWN:
- #ifdef FE_DOWNWARD
- fesetround (FE_DOWNWARD) ;
- #else
- GSL_ERROR ("round-down is not supported by <fenv.h>", GSL_EUNSUP) ;
- #endif
- break ;
- case GSL_IEEE_ROUND_UP:
- #ifdef FE_UPWARD
- fesetround (FE_UPWARD) ;
- #else
- GSL_ERROR ("round-up is not supported by <fenv.h>", GSL_EUNSUP) ;
- #endif
- break ;
- case GSL_IEEE_ROUND_TO_ZERO:
- #ifdef FE_TOWARDZERO
- fesetround (FE_TOWARDZERO) ;
- #else
- GSL_ERROR ("round-toward-zero is not supported by <fenv.h>", GSL_EUNSUP) ;
- #endif
- break ;
- default:
- #ifdef FE_TONEAREST
- fesetround (FE_TONEAREST) ;
- #else
- GSL_ERROR ("default round-to-nearest mode is not supported by <fenv.h>", GSL_EUNSUP) ;
- #endif
- }
- /* Turn on all the exceptions apart from 'inexact' */
- mode = 0;
- #ifdef FE_INVALID
- mode |= FE_INVALID;
- #endif
- #ifdef FE_DIVBYZERO
- mode |= FE_DIVBYZERO;
- #endif
-
- #ifdef FE_OVERFLOW
- mode |= FE_OVERFLOW ;
- #endif
- #ifdef FE_UNDERFLOW
- mode |= FE_UNDERFLOW ;
- #endif
- if (exception_mask & GSL_IEEE_MASK_INVALID)
- {
- #ifdef FE_INVALID
- mode &= ~ FE_INVALID ;
- #else
- GSL_ERROR ("invalid operation exception not supported by <fenv.h>",
- GSL_EUNSUP);
- #endif
- }
- if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
- {
- /* do nothing */
- }
- else
- {
- GSL_ERROR ("denormalized operand exception not supported by <fenv.h>. "
- "Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
- }
- if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
- {
- #ifdef FE_DIVBYZERO
- mode &= ~ FE_DIVBYZERO ;
- #else
- GSL_ERROR ("division by zero exception not supported by <fenv.h>",
- GSL_EUNSUP);
- #endif
- }
- if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
- {
- #ifdef FE_OVERFLOW
- mode &= ~ FE_OVERFLOW ;
- #else
- GSL_ERROR ("overflow exception not supported by <fenv.h>", GSL_EUNSUP);
- #endif
- }
- if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
- {
- #ifdef FE_UNDERFLOW
- mode &= ~ FE_UNDERFLOW ;
- #else
- GSL_ERROR ("underflow exception not supported by <fenv.h>", GSL_EUNSUP);
- #endif
- }
- if (exception_mask & GSL_IEEE_TRAP_INEXACT)
- {
- #ifdef FE_INEXACT
- mode |= FE_INEXACT ;
- #else
- GSL_ERROR ("inexact exception not supported by <fenv.h>", GSL_EUNSUP);
- #endif
- }
- else
- {
- #ifdef FE_INEXACT
- mode &= ~ FE_INEXACT ;
- #else
- /* do nothing */
- #endif
- }
- #if HAVE_DECL_FEENABLEEXCEPT
- feenableexcept (mode) ;
- #elif HAVE_DECL_FESETTRAPENABLE
- fesettrapenable (mode);
- #else
- GSL_ERROR ("unknown exception trap method", GSL_EUNSUP)
- #endif
- return GSL_SUCCESS ;
- }
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