libgfortran/config/fpu-glibc.h

   1 /* FPU-related code for systems with GNU libc.
   2    Copyright 2005, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 /* FPU-related code for systems with the GNU libc, providing the
  27    feenableexcept function in fenv.h to set individual exceptions
  28    (there's nothing to do that in C99).  */
  29
  30 #ifdef HAVE_FENV_H
  31 #include <fenv.h>
  32 #endif
  33
  34 void set_fpu (void)
  35 {
  36   if (FE_ALL_EXCEPT != 0)
  37     fedisableexcept (FE_ALL_EXCEPT);
  38
  39   if (options.fpe & GFC_FPE_INVALID)
  40 #ifdef FE_INVALID
  41     feenableexcept (FE_INVALID);
  42 #else
  43     st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
  44                "exception not supported.\n");
  45 #endif
  46
  47 /* glibc does never have a FE_DENORMAL.  */
  48   if (options.fpe & GFC_FPE_DENORMAL)
  49 #ifdef FE_DENORMAL
  50     feenableexcept (FE_DENORMAL);
  51 #else
  52     st_printf ("Fortran runtime warning: IEEE 'denormal number' "
  53                "exception not supported.\n");
  54 #endif
  55
  56   if (options.fpe & GFC_FPE_ZERO)
  57 #ifdef FE_DIVBYZERO
  58     feenableexcept (FE_DIVBYZERO);
  59 #else
  60     st_printf ("Fortran runtime warning: IEEE 'division by zero' "
  61                "exception not supported.\n");
  62 #endif
  63
  64   if (options.fpe & GFC_FPE_OVERFLOW)
  65 #ifdef FE_OVERFLOW
  66     feenableexcept (FE_OVERFLOW);
  67 #else
  68     st_printf ("Fortran runtime warning: IEEE 'overflow' "
  69                "exception not supported.\n");
  70 #endif
  71
  72   if (options.fpe & GFC_FPE_UNDERFLOW)
  73 #ifdef FE_UNDERFLOW
  74     feenableexcept (FE_UNDERFLOW);
  75 #else
  76     st_printf ("Fortran runtime warning: IEEE 'underflow' "
  77                "exception not supported.\n");
  78 #endif
  79
  80   if (options.fpe & GFC_FPE_PRECISION)
  81 #ifdef FE_INEXACT
  82     feenableexcept (FE_INEXACT);
  83 #else
  84     st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
  85                "exception not supported.\n");
  86 #endif
  87 }