202 lines
4.3 KiB
C
202 lines
4.3 KiB
C
/* FPU-related code for systems with GNU libc.
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Copyright (C) 2005-2014 Free Software Foundation, Inc.
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Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* FPU-related code for systems with the GNU libc, providing the
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feenableexcept function in fenv.h to set individual exceptions
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(there's nothing to do that in C99). */
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#ifdef HAVE_FENV_H
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#include <fenv.h>
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#endif
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void set_fpu (void)
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{
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if (FE_ALL_EXCEPT != 0)
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fedisableexcept (FE_ALL_EXCEPT);
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if (options.fpe & GFC_FPE_INVALID)
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#ifdef FE_INVALID
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feenableexcept (FE_INVALID);
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#else
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estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
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"exception not supported.\n");
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#endif
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/* glibc does never have a FE_DENORMAL. */
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if (options.fpe & GFC_FPE_DENORMAL)
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#ifdef FE_DENORMAL
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feenableexcept (FE_DENORMAL);
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#else
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estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
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"exception not supported.\n");
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#endif
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if (options.fpe & GFC_FPE_ZERO)
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#ifdef FE_DIVBYZERO
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feenableexcept (FE_DIVBYZERO);
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#else
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estr_write ("Fortran runtime warning: IEEE 'division by zero' "
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"exception not supported.\n");
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#endif
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if (options.fpe & GFC_FPE_OVERFLOW)
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#ifdef FE_OVERFLOW
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feenableexcept (FE_OVERFLOW);
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#else
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estr_write ("Fortran runtime warning: IEEE 'overflow' "
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"exception not supported.\n");
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#endif
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if (options.fpe & GFC_FPE_UNDERFLOW)
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#ifdef FE_UNDERFLOW
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feenableexcept (FE_UNDERFLOW);
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#else
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estr_write ("Fortran runtime warning: IEEE 'underflow' "
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"exception not supported.\n");
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#endif
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if (options.fpe & GFC_FPE_INEXACT)
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#ifdef FE_INEXACT
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feenableexcept (FE_INEXACT);
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#else
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estr_write ("Fortran runtime warning: IEEE 'inexact' "
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"exception not supported.\n");
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#endif
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}
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int
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get_fpu_except_flags (void)
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{
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int result, set_excepts;
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result = 0;
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set_excepts = fetestexcept (FE_ALL_EXCEPT);
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#ifdef FE_INVALID
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if (set_excepts & FE_INVALID)
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result |= GFC_FPE_INVALID;
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#endif
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#ifdef FE_DIVBYZERO
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if (set_excepts & FE_DIVBYZERO)
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result |= GFC_FPE_ZERO;
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#endif
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#ifdef FE_OVERFLOW
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if (set_excepts & FE_OVERFLOW)
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result |= GFC_FPE_OVERFLOW;
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#endif
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#ifdef FE_UNDERFLOW
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if (set_excepts & FE_UNDERFLOW)
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result |= GFC_FPE_UNDERFLOW;
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#endif
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#ifdef FE_DENORMAL
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if (set_excepts & FE_DENORMAL)
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result |= GFC_FPE_DENORMAL;
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#endif
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#ifdef FE_INEXACT
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if (set_excepts & FE_INEXACT)
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result |= GFC_FPE_INEXACT;
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#endif
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return result;
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}
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int
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get_fpu_rounding_mode (void)
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{
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int rnd_mode;
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rnd_mode = fegetround ();
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switch (rnd_mode)
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{
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#ifdef FE_TONEAREST
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case FE_TONEAREST:
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return GFC_FPE_TONEAREST;
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#endif
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#ifdef FE_UPWARD
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case FE_UPWARD:
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return GFC_FPE_UPWARD;
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#endif
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#ifdef FE_DOWNWARD
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case FE_DOWNWARD:
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return GFC_FPE_DOWNWARD;
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#endif
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#ifdef FE_TOWARDZERO
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case FE_TOWARDZERO:
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return GFC_FPE_TOWARDZERO;
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#endif
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default:
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return GFC_FPE_INVALID;
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}
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}
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void
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set_fpu_rounding_mode (int mode)
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{
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int rnd_mode;
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switch (mode)
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{
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#ifdef FE_TONEAREST
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case GFC_FPE_TONEAREST:
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rnd_mode = FE_TONEAREST;
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break;
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#endif
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#ifdef FE_UPWARD
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case GFC_FPE_UPWARD:
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rnd_mode = FE_UPWARD;
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break;
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#endif
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#ifdef FE_DOWNWARD
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case GFC_FPE_DOWNWARD:
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rnd_mode = FE_DOWNWARD;
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break;
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#endif
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#ifdef FE_TOWARDZERO
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case GFC_FPE_TOWARDZERO:
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rnd_mode = FE_TOWARDZERO;
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break;
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#endif
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default:
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return;
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}
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fesetround (rnd_mode);
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}
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