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/* FPU-related code for systems with GNU libc.

   Copyright 2005, 2007, 2009, 2011 Free Software Foundation, Inc.

   Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>

This file is part of the GNU Fortran runtime library (libgfortran).

Libgfortran 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.

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

/* FPU-related code for systems with the GNU libc, providing the

   feenableexcept function in fenv.h to set individual exceptions

   (there's nothing to do that in C99).  */

#ifdef HAVE_FENV_H

#include <fenv.h>

#endif

void set_fpu (void)

{

  if (FE_ALL_EXCEPT != 0)

    fedisableexcept (FE_ALL_EXCEPT);

  if (options.fpe & GFC_FPE_INVALID)

#ifdef FE_INVALID

    feenableexcept (FE_INVALID);

#else

    estr_write ("Fortran runtime warning: IEEE 'invalid operation' "

                "exception not supported.\n");

#endif

/* glibc does never have a FE_DENORMAL.  */

  if (options.fpe & GFC_FPE_DENORMAL)

#ifdef FE_DENORMAL

    feenableexcept (FE_DENORMAL);

#else

    estr_write ("Fortran runtime warning: Floating point 'denormal operand' "

                "exception not supported.\n");

#endif

  if (options.fpe & GFC_FPE_ZERO)

#ifdef FE_DIVBYZERO

    feenableexcept (FE_DIVBYZERO);

#else

    estr_write ("Fortran runtime warning: IEEE 'division by zero' "

                "exception not supported.\n");

#endif

  if (options.fpe & GFC_FPE_OVERFLOW)

#ifdef FE_OVERFLOW

    feenableexcept (FE_OVERFLOW);

#else

    estr_write ("Fortran runtime warning: IEEE 'overflow' "

                "exception not supported.\n");

#endif

  if (options.fpe & GFC_FPE_UNDERFLOW)

#ifdef FE_UNDERFLOW

    feenableexcept (FE_UNDERFLOW);

#else

    estr_write ("Fortran runtime warning: IEEE 'underflow' "

                "exception not supported.\n");

#endif

  if (options.fpe & GFC_FPE_INEXACT)

#ifdef FE_INEXACT

    feenableexcept (FE_INEXACT);

#else

    estr_write ("Fortran runtime warning: IEEE 'inexact' "

                "exception not supported.\n");

#endif

}