libgfortran/config/fpu-glibc.h

   1 /* FPU-related code for systems with GNU libc.
   2    Copyright 2005, 2007 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 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31
  32 /* FPU-related code for systems with the GNU libc, providing the
  33    feenableexcept function in fenv.h to set individual exceptions
  34    (there's nothing to do that in C99).  */
  35
  36 #ifdef HAVE_FENV_H
  37 #include <fenv.h>
  38 #endif
  39
  40 void set_fpu (void)
  41 {
  42   if (FE_ALL_EXCEPT != 0)
  43     fedisableexcept (FE_ALL_EXCEPT);
  44
  45   if (options.fpe & GFC_FPE_INVALID)
  46 #ifdef FE_INVALID
  47     feenableexcept (FE_INVALID);
  48 #else
  49     st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
  50                "exception not supported.\n");
  51 #endif
  52
  53 /* glibc does never have a FE_DENORMAL.  */
  54   if (options.fpe & GFC_FPE_DENORMAL)
  55 #ifdef FE_DENORMAL
  56     feenableexcept (FE_DENORMAL);
  57 #else
  58     st_printf ("Fortran runtime warning: IEEE 'denormal number' "
  59                "exception not supported.\n");
  60 #endif
  61
  62   if (options.fpe & GFC_FPE_ZERO)
  63 #ifdef FE_DIVBYZERO
  64     feenableexcept (FE_DIVBYZERO);
  65 #else
  66     st_printf ("Fortran runtime warning: IEEE 'division by zero' "
  67                "exception not supported.\n");
  68 #endif
  69
  70   if (options.fpe & GFC_FPE_OVERFLOW)
  71 #ifdef FE_OVERFLOW
  72     feenableexcept (FE_OVERFLOW);
  73 #else
  74     st_printf ("Fortran runtime warning: IEEE 'overflow' "
  75                "exception not supported.\n");
  76 #endif
  77
  78   if (options.fpe & GFC_FPE_UNDERFLOW)
  79 #ifdef FE_UNDERFLOW
  80     feenableexcept (FE_UNDERFLOW);
  81 #else
  82     st_printf ("Fortran runtime warning: IEEE 'underflow' "
  83                "exception not supported.\n");
  84 #endif
  85
  86   if (options.fpe & GFC_FPE_PRECISION)
  87 #ifdef FE_INEXACT
  88     feenableexcept (FE_INEXACT);
  89 #else
  90     st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
  91                "exception not supported.\n");
  92 #endif
  93 }