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510 lines
9.3 KiB
C
510 lines
9.3 KiB
C
/* FPU-related code for systems with GNU libc.
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Copyright (C) 2005-2024 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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/* Check we can actually store the FPU state in the allocated size. */
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_Static_assert (sizeof(fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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"GFC_FPE_STATE_BUFFER_SIZE is too small");
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void set_fpu_trap_exceptions (int trap, int notrap)
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{
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int mode_set = 0, mode_clr = 0;
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#ifdef FE_INVALID
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if (trap & GFC_FPE_INVALID)
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mode_set |= FE_INVALID;
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if (notrap & GFC_FPE_INVALID)
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mode_clr |= FE_INVALID;
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#endif
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/* Some glibc targets (like alpha) have FE_DENORMAL, but not many. */
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#ifdef FE_DENORMAL
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if (trap & GFC_FPE_DENORMAL)
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mode_set |= FE_DENORMAL;
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if (notrap & GFC_FPE_DENORMAL)
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mode_clr |= FE_DENORMAL;
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#endif
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#ifdef FE_DIVBYZERO
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if (trap & GFC_FPE_ZERO)
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mode_set |= FE_DIVBYZERO;
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if (notrap & GFC_FPE_ZERO)
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mode_clr |= FE_DIVBYZERO;
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#endif
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#ifdef FE_OVERFLOW
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if (trap & GFC_FPE_OVERFLOW)
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mode_set |= FE_OVERFLOW;
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if (notrap & GFC_FPE_OVERFLOW)
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mode_clr |= FE_OVERFLOW;
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#endif
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#ifdef FE_UNDERFLOW
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if (trap & GFC_FPE_UNDERFLOW)
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mode_set |= FE_UNDERFLOW;
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if (notrap & GFC_FPE_UNDERFLOW)
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mode_clr |= FE_UNDERFLOW;
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#endif
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#ifdef FE_INEXACT
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if (trap & GFC_FPE_INEXACT)
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mode_set |= FE_INEXACT;
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if (notrap & GFC_FPE_INEXACT)
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mode_clr |= FE_INEXACT;
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#endif
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/* Clear stalled exception flags. */
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feclearexcept (FE_ALL_EXCEPT);
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feenableexcept (mode_set);
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fedisableexcept (mode_clr);
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}
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int
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get_fpu_trap_exceptions (void)
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{
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int exceptions = fegetexcept ();
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int res = 0;
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#ifdef FE_INVALID
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if (exceptions & FE_INVALID) res |= GFC_FPE_INVALID;
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#endif
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#ifdef FE_DENORMAL
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if (exceptions & FE_DENORMAL) res |= GFC_FPE_DENORMAL;
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#endif
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#ifdef FE_DIVBYZERO
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if (exceptions & FE_DIVBYZERO) res |= GFC_FPE_ZERO;
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#endif
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#ifdef FE_OVERFLOW
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if (exceptions & FE_OVERFLOW) res |= GFC_FPE_OVERFLOW;
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#endif
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#ifdef FE_UNDERFLOW
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if (exceptions & FE_UNDERFLOW) res |= GFC_FPE_UNDERFLOW;
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#endif
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#ifdef FE_INEXACT
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if (exceptions & FE_INEXACT) res |= GFC_FPE_INEXACT;
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#endif
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return res;
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}
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int
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support_fpu_trap (int flag)
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{
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return support_fpu_flag (flag);
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}
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void set_fpu (void)
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{
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#ifndef FE_INVALID
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if (options.fpe & GFC_FPE_INVALID)
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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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#ifndef FE_DENORMAL
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if (options.fpe & GFC_FPE_DENORMAL)
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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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#ifndef FE_DIVBYZERO
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if (options.fpe & GFC_FPE_ZERO)
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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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#ifndef FE_OVERFLOW
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if (options.fpe & GFC_FPE_OVERFLOW)
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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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#ifndef FE_UNDERFLOW
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if (options.fpe & GFC_FPE_UNDERFLOW)
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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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#ifndef FE_INEXACT
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if (options.fpe & GFC_FPE_INEXACT)
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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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set_fpu_trap_exceptions (options.fpe, 0);
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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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void
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set_fpu_except_flags (int set, int clear)
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{
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int exc_set = 0, exc_clr = 0;
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#ifdef FE_INVALID
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if (set & GFC_FPE_INVALID)
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exc_set |= FE_INVALID;
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else if (clear & GFC_FPE_INVALID)
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exc_clr |= FE_INVALID;
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#endif
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#ifdef FE_DIVBYZERO
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if (set & GFC_FPE_ZERO)
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exc_set |= FE_DIVBYZERO;
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else if (clear & GFC_FPE_ZERO)
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exc_clr |= FE_DIVBYZERO;
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#endif
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#ifdef FE_OVERFLOW
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if (set & GFC_FPE_OVERFLOW)
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exc_set |= FE_OVERFLOW;
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else if (clear & GFC_FPE_OVERFLOW)
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exc_clr |= FE_OVERFLOW;
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#endif
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#ifdef FE_UNDERFLOW
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if (set & GFC_FPE_UNDERFLOW)
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exc_set |= FE_UNDERFLOW;
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else if (clear & GFC_FPE_UNDERFLOW)
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exc_clr |= FE_UNDERFLOW;
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#endif
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#ifdef FE_DENORMAL
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if (set & GFC_FPE_DENORMAL)
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exc_set |= FE_DENORMAL;
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else if (clear & GFC_FPE_DENORMAL)
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exc_clr |= FE_DENORMAL;
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#endif
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#ifdef FE_INEXACT
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if (set & GFC_FPE_INEXACT)
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exc_set |= FE_INEXACT;
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else if (clear & GFC_FPE_INEXACT)
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exc_clr |= FE_INEXACT;
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#endif
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feclearexcept (exc_clr);
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feraiseexcept (exc_set);
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}
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int
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support_fpu_flag (int flag)
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{
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if (flag & GFC_FPE_INVALID)
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{
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#ifndef FE_INVALID
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return 0;
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#endif
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}
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else if (flag & GFC_FPE_ZERO)
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{
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#ifndef FE_DIVBYZERO
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return 0;
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#endif
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}
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else if (flag & GFC_FPE_OVERFLOW)
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{
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#ifndef FE_OVERFLOW
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return 0;
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#endif
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}
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else if (flag & GFC_FPE_UNDERFLOW)
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{
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#ifndef FE_UNDERFLOW
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return 0;
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#endif
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}
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else if (flag & GFC_FPE_DENORMAL)
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{
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#ifndef FE_DENORMAL
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return 0;
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#endif
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}
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else if (flag & GFC_FPE_INEXACT)
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{
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#ifndef FE_INEXACT
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return 0;
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#endif
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}
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return 1;
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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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#ifdef FE_TONEARESTFROMZERO
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case FE_TONEARESTFROMZERO:
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return GFC_FPE_AWAY;
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#endif
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default:
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return 0; /* Should be unreachable. */
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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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#ifdef FE_TONEARESTFROMZERO
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case GFC_FPE_AWAY:
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rnd_mode = FE_TONEARESTFROMZERO;
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break;
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#endif
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default:
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return; /* Should be unreachable. */
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}
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fesetround (rnd_mode);
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}
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int
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support_fpu_rounding_mode (int mode)
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{
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switch (mode)
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{
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case GFC_FPE_TONEAREST:
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#ifdef FE_TONEAREST
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return 1;
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#else
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return 0;
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#endif
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case GFC_FPE_UPWARD:
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#ifdef FE_UPWARD
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return 1;
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#else
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return 0;
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#endif
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case GFC_FPE_DOWNWARD:
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#ifdef FE_DOWNWARD
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return 1;
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#else
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return 0;
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#endif
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case GFC_FPE_TOWARDZERO:
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#ifdef FE_TOWARDZERO
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return 1;
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#else
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return 0;
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#endif
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case GFC_FPE_AWAY:
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#ifdef FE_TONEARESTFROMZERO
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return 1;
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#else
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return 0;
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#endif
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default:
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return 0; /* Should be unreachable. */
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}
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}
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void
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get_fpu_state (void *state)
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{
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fegetenv (state);
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}
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void
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set_fpu_state (void *state)
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{
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fesetenv (state);
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}
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/* Underflow in glibc is currently only supported on alpha, through
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the FE_MAP_UMZ macro and __ieee_set_fp_control() function call. */
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int
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support_fpu_underflow_control (int kind __attribute__((unused)))
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{
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#if defined(__alpha__) && defined(FE_MAP_UMZ)
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return (kind == 4 || kind == 8) ? 1 : 0;
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#else
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return 0;
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#endif
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}
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int
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get_fpu_underflow_mode (void)
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{
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#if defined(__alpha__) && defined(FE_MAP_UMZ)
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fenv_t state = __ieee_get_fp_control ();
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/* Return 0 for abrupt underflow (flush to zero), 1 for gradual underflow. */
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return (state & FE_MAP_UMZ) ? 0 : 1;
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#else
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return 0;
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#endif
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}
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void
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set_fpu_underflow_mode (int gradual __attribute__((unused)))
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{
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#if defined(__alpha__) && defined(FE_MAP_UMZ)
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fenv_t state = __ieee_get_fp_control ();
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if (gradual)
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state &= ~FE_MAP_UMZ;
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else
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state |= FE_MAP_UMZ;
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__ieee_set_fp_control (state);
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#endif
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}
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