440 lines
7.7 KiB
C
440 lines
7.7 KiB
C
/* AIX FPU-related code.
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Copyright (C) 2005-2017 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 AIX. */
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#ifdef HAVE_FPTRAP_H
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#include <fptrap.h>
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#endif
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#ifdef HAVE_FPXCP_H
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#include <fpxcp.h>
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#endif
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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
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set_fpu_trap_exceptions (int trap, int notrap)
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{
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fptrap_t mode_set = 0, mode_clr = 0;
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#ifdef TRP_INVALID
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if (trap & GFC_FPE_INVALID)
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mode_set |= TRP_INVALID;
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if (notrap & GFC_FPE_INVALID)
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mode_clr |= TRP_INVALID;
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#endif
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#ifdef TRP_DIV_BY_ZERO
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if (trap & GFC_FPE_ZERO)
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mode_set |= TRP_DIV_BY_ZERO;
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if (notrap & GFC_FPE_ZERO)
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mode_clr |= TRP_DIV_BY_ZERO;
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#endif
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#ifdef TRP_OVERFLOW
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if (trap & GFC_FPE_OVERFLOW)
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mode_set |= TRP_OVERFLOW;
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if (notrap & GFC_FPE_OVERFLOW)
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mode_clr |= TRP_OVERFLOW;
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#endif
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#ifdef TRP_UNDERFLOW
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if (trap & GFC_FPE_UNDERFLOW)
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mode_set |= TRP_UNDERFLOW;
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if (notrap & GFC_FPE_UNDERFLOW)
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mode_clr |= TRP_UNDERFLOW;
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#endif
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#ifdef TRP_INEXACT
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if (trap & GFC_FPE_INEXACT)
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mode_set |= TRP_INEXACT;
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if (notrap & GFC_FPE_INEXACT)
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mode_clr |= TRP_INEXACT;
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#endif
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fp_trap (FP_TRAP_SYNC);
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fp_enable (mode_set);
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fp_disable (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 res = 0;
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#ifdef TRP_INVALID
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if (fp_is_enabled (TRP_INVALID))
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res |= GFC_FPE_INVALID;
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#endif
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#ifdef TRP_DIV_BY_ZERO
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if (fp_is_enabled (TRP_DIV_BY_ZERO))
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res |= GFC_FPE_ZERO;
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#endif
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#ifdef TRP_OVERFLOW
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if (fp_is_enabled (TRP_OVERFLOW))
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res |= GFC_FPE_OVERFLOW;
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#endif
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#ifdef TRP_UNDERFLOW
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if (fp_is_enabled (TRP_UNDERFLOW))
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res |= GFC_FPE_UNDERFLOW;
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#endif
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#ifdef TRP_INEXACT
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if (fp_is_enabled (TRP_INEXACT))
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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
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set_fpu (void)
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{
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#ifndef TRP_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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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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#ifndef TRP_DIV_BY_ZERO
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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 TRP_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 TRP_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 TRP_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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#ifdef HAVE_FPXCP_H
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if (!fp_any_xcp ())
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return 0;
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if (fp_invalid_op ())
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result |= GFC_FPE_INVALID;
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if (fp_divbyzero ())
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result |= GFC_FPE_ZERO;
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if (fp_overflow ())
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result |= GFC_FPE_OVERFLOW;
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if (fp_underflow ())
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result |= GFC_FPE_UNDERFLOW;
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if (fp_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 FP_INVALID
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if (set & GFC_FPE_INVALID)
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exc_set |= FP_INVALID;
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else if (clear & GFC_FPE_INVALID)
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exc_clr |= FP_INVALID;
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#endif
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#ifdef FP_DIV_BY_ZERO
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if (set & GFC_FPE_ZERO)
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exc_set |= FP_DIV_BY_ZERO;
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else if (clear & GFC_FPE_ZERO)
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exc_clr |= FP_DIV_BY_ZERO;
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#endif
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#ifdef FP_OVERFLOW
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if (set & GFC_FPE_OVERFLOW)
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exc_set |= FP_OVERFLOW;
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else if (clear & GFC_FPE_OVERFLOW)
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exc_clr |= FP_OVERFLOW;
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#endif
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#ifdef FP_UNDERFLOW
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if (set & GFC_FPE_UNDERFLOW)
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exc_set |= FP_UNDERFLOW;
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else if (clear & GFC_FPE_UNDERFLOW)
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exc_clr |= FP_UNDERFLOW;
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#endif
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/* AIX does not have FP_DENORMAL. */
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#ifdef FP_INEXACT
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if (set & GFC_FPE_INEXACT)
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exc_set |= FP_INEXACT;
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else if (clear & GFC_FPE_INEXACT)
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exc_clr |= FP_INEXACT;
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#endif
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fp_clr_flag (exc_clr);
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fp_set_flag (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 FP_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 FP_DIV_BY_ZERO
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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 FP_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 FP_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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/* AIX does not support denormal flag. */
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return 0;
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}
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else if (flag & GFC_FPE_INEXACT)
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{
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#ifndef FP_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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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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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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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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int
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support_fpu_underflow_control (int kind __attribute__((unused)))
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{
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return 0;
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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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return 0;
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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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}
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