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/* FPU-related code for systems with GNU libc.
Copyright (C) 2005-2014 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
}
int
get_fpu_except_flags (void)
{
int result, set_excepts;
result = 0;
set_excepts = fetestexcept (FE_ALL_EXCEPT);
#ifdef FE_INVALID
if (set_excepts & FE_INVALID)
result |= GFC_FPE_INVALID;
#endif
#ifdef FE_DIVBYZERO
if (set_excepts & FE_DIVBYZERO)
result |= GFC_FPE_ZERO;
#endif
#ifdef FE_OVERFLOW
if (set_excepts & FE_OVERFLOW)
result |= GFC_FPE_OVERFLOW;
#endif
#ifdef FE_UNDERFLOW
if (set_excepts & FE_UNDERFLOW)
result |= GFC_FPE_UNDERFLOW;
#endif
#ifdef FE_DENORMAL
if (set_excepts & FE_DENORMAL)
result |= GFC_FPE_DENORMAL;
#endif
#ifdef FE_INEXACT
if (set_excepts & FE_INEXACT)
result |= GFC_FPE_INEXACT;
#endif
return result;
}
int
get_fpu_rounding_mode (void)
{
int rnd_mode;
rnd_mode = fegetround ();
switch (rnd_mode)
{
#ifdef FE_TONEAREST
case FE_TONEAREST:
return GFC_FPE_TONEAREST;
#endif
#ifdef FE_UPWARD
case FE_UPWARD:
return GFC_FPE_UPWARD;
#endif
#ifdef FE_DOWNWARD
case FE_DOWNWARD:
return GFC_FPE_DOWNWARD;
#endif
#ifdef FE_TOWARDZERO
case FE_TOWARDZERO:
return GFC_FPE_TOWARDZERO;
#endif
default:
return GFC_FPE_INVALID;
}
}
void
set_fpu_rounding_mode (int mode)
{
int rnd_mode;
switch (mode)
{
#ifdef FE_TONEAREST
case GFC_FPE_TONEAREST:
rnd_mode = FE_TONEAREST;
break;
#endif
#ifdef FE_UPWARD
case GFC_FPE_UPWARD:
rnd_mode = FE_UPWARD;
break;
#endif
#ifdef FE_DOWNWARD
case GFC_FPE_DOWNWARD:
rnd_mode = FE_DOWNWARD;
break;
#endif
#ifdef FE_TOWARDZERO
case GFC_FPE_TOWARDZERO:
rnd_mode = FE_TOWARDZERO;
break;
#endif
default:
return;
}
fesetround (rnd_mode);
}
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