818ab71a41
From-SVN: r232055
436 lines
7.9 KiB
C
436 lines
7.9 KiB
C
/* SysV FPU-related code (for systems not otherwise supported).
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Copyright (C) 2005-2016 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 SysV platforms with fpsetmask(). */
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/* BSD and Solaris systems have slightly different types and functions
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naming. We deal with these here, to simplify the code below. */
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#if HAVE_FP_EXCEPT
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# define FP_EXCEPT_TYPE fp_except
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#elif HAVE_FP_EXCEPT_T
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# define FP_EXCEPT_TYPE fp_except_t
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#else
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choke me
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#endif
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#if HAVE_FP_RND
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# define FP_RND_TYPE fp_rnd
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#elif HAVE_FP_RND_T
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# define FP_RND_TYPE fp_rnd_t
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#else
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choke me
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#endif
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#if HAVE_FPSETSTICKY
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# define FPSETSTICKY fpsetsticky
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#elif HAVE_FPRESETSTICKY
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# define FPSETSTICKY fpresetsticky
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#else
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choke me
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#endif
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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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FP_EXCEPT_TYPE cw = fpgetmask();
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#ifdef FP_X_INV
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if (trap & GFC_FPE_INVALID)
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cw |= FP_X_INV;
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if (notrap & GFC_FPE_INVALID)
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cw &= ~FP_X_INV;
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#endif
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#ifdef FP_X_DNML
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if (trap & GFC_FPE_DENORMAL)
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cw |= FP_X_DNML;
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if (notrap & GFC_FPE_DENORMAL)
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cw &= ~FP_X_DNML;
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#endif
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#ifdef FP_X_DZ
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if (trap & GFC_FPE_ZERO)
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cw |= FP_X_DZ;
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if (notrap & GFC_FPE_ZERO)
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cw &= ~FP_X_DZ;
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#endif
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#ifdef FP_X_OFL
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if (trap & GFC_FPE_OVERFLOW)
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cw |= FP_X_OFL;
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if (notrap & GFC_FPE_OVERFLOW)
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cw &= ~FP_X_OFL;
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#endif
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#ifdef FP_X_UFL
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if (trap & GFC_FPE_UNDERFLOW)
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cw |= FP_X_UFL;
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if (notrap & GFC_FPE_UNDERFLOW)
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cw &= ~FP_X_UFL;
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#endif
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#ifdef FP_X_IMP
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if (trap & GFC_FPE_INEXACT)
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cw |= FP_X_IMP;
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if (notrap & GFC_FPE_INEXACT)
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cw &= ~FP_X_IMP;
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#endif
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fpsetmask(cw);
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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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FP_EXCEPT_TYPE cw = fpgetmask();
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#ifdef FP_X_INV
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if (cw & FP_X_INV) res |= GFC_FPE_INVALID;
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#endif
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#ifdef FP_X_DNML
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if (cw & FP_X_DNML) res |= GFC_FPE_DENORMAL;
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#endif
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#ifdef FP_X_DZ
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if (cw & FP_X_DZ) res |= GFC_FPE_ZERO;
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#endif
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#ifdef FP_X_OFL
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if (cw & FP_X_OFL) res |= GFC_FPE_OVERFLOW;
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#endif
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#ifdef FP_X_UFL
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if (cw & FP_X_UFL) res |= GFC_FPE_UNDERFLOW;
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#endif
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#ifdef FP_X_IMP
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if (cw & FP_X_IMP) 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 FP_X_INV
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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 FP_X_DNML
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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 FP_X_DZ
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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 FP_X_OFL
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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 FP_X_UFL
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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 FP_X_IMP
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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;
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FP_EXCEPT_TYPE set_excepts;
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result = 0;
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set_excepts = fpgetsticky ();
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#ifdef FP_X_INV
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if (set_excepts & FP_X_INV)
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result |= GFC_FPE_INVALID;
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#endif
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#ifdef FP_X_DZ
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if (set_excepts & FP_X_DZ)
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result |= GFC_FPE_ZERO;
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#endif
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#ifdef FP_X_OFL
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if (set_excepts & FP_X_OFL)
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result |= GFC_FPE_OVERFLOW;
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#endif
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#ifdef FP_X_UFL
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if (set_excepts & FP_X_UFL)
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result |= GFC_FPE_UNDERFLOW;
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#endif
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#ifdef FP_X_DNML
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if (set_excepts & FP_X_DNML)
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result |= GFC_FPE_DENORMAL;
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#endif
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#ifdef FP_X_IMP
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if (set_excepts & FP_X_IMP)
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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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FP_EXCEPT_TYPE flags;
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flags = fpgetsticky ();
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#ifdef FP_X_INV
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if (set & GFC_FPE_INVALID)
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flags |= FP_X_INV;
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if (clear & GFC_FPE_INVALID)
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flags &= ~FP_X_INV;
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#endif
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#ifdef FP_X_DZ
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if (set & GFC_FPE_ZERO)
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flags |= FP_X_DZ;
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if (clear & GFC_FPE_ZERO)
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flags &= ~FP_X_DZ;
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#endif
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#ifdef FP_X_OFL
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if (set & GFC_FPE_OVERFLOW)
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flags |= FP_X_OFL;
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if (clear & GFC_FPE_OVERFLOW)
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flags &= ~FP_X_OFL;
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#endif
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#ifdef FP_X_UFL
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if (set & GFC_FPE_UNDERFLOW)
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flags |= FP_X_UFL;
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if (clear & GFC_FPE_UNDERFLOW)
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flags &= ~FP_X_UFL;
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#endif
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#ifdef FP_X_DNML
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if (set & GFC_FPE_DENORMAL)
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flags |= FP_X_DNML;
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if (clear & GFC_FPE_DENORMAL)
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flags &= ~FP_X_DNML;
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#endif
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#ifdef FP_X_IMP
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if (set & GFC_FPE_INEXACT)
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flags |= FP_X_IMP;
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if (clear & GFC_FPE_INEXACT)
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flags &= ~FP_X_IMP;
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#endif
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FPSETSTICKY (flags);
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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_X_INV
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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_X_DZ
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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_X_OFL
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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_X_UFL
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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 FP_X_DNML
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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 FP_X_IMP
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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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switch (fpgetround ())
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{
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case FP_RN:
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return GFC_FPE_TONEAREST;
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case FP_RP:
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return GFC_FPE_UPWARD;
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case FP_RM:
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return GFC_FPE_DOWNWARD;
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case FP_RZ:
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return GFC_FPE_TOWARDZERO;
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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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FP_RND_TYPE rnd_mode;
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switch (mode)
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{
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case GFC_FPE_TONEAREST:
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rnd_mode = FP_RN;
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break;
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case GFC_FPE_UPWARD:
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rnd_mode = FP_RP;
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break;
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case GFC_FPE_DOWNWARD:
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rnd_mode = FP_RM;
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break;
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case GFC_FPE_TOWARDZERO:
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rnd_mode = FP_RZ;
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break;
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default:
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return; /* Should be unreachable. */
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}
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fpsetround (rnd_mode);
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}
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int
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support_fpu_rounding_mode (int mode __attribute__((unused)))
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{
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return 1;
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}
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typedef struct
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{
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FP_EXCEPT_TYPE mask;
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FP_EXCEPT_TYPE sticky;
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FP_RND_TYPE round;
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} fpu_state_t;
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/* Check we can actually store the FPU state in the allocated size. */
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_Static_assert (sizeof(fpu_state_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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get_fpu_state (void *s)
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{
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fpu_state_t *state = s;
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state->mask = fpgetmask ();
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state->sticky = fpgetsticky ();
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state->round = fpgetround ();
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}
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void
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set_fpu_state (void *s)
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{
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fpu_state_t *state = s;
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fpsetmask (state->mask);
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FPSETSTICKY (state->sticky);
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fpsetround (state->round);
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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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