117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/* Helper functions in C for IEEE modules
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Copyright (C) 2013-2015 Free Software Foundation, Inc.
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Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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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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#include "libgfortran.h"
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/* Prototypes. */
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extern int ieee_class_helper_4 (GFC_REAL_4 *);
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internal_proto(ieee_class_helper_4);
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extern int ieee_class_helper_8 (GFC_REAL_8 *);
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internal_proto(ieee_class_helper_8);
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/* Enumeration of the possible floating-point types. These values
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correspond to the hidden arguments of the IEEE_CLASS_TYPE
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derived-type of IEEE_ARITHMETIC. */
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enum { IEEE_OTHER_VALUE = 0, IEEE_SIGNALING_NAN, IEEE_QUIET_NAN,
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IEEE_NEGATIVE_INF, IEEE_NEGATIVE_NORMAL, IEEE_NEGATIVE_DENORMAL,
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IEEE_NEGATIVE_ZERO, IEEE_POSITIVE_ZERO, IEEE_POSITIVE_DENORMAL,
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IEEE_POSITIVE_NORMAL, IEEE_POSITIVE_INF };
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#define CLASSMACRO(TYPE) \
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int ieee_class_helper_ ## TYPE (GFC_REAL_ ## TYPE *value) \
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{ \
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int res = __builtin_fpclassify (IEEE_QUIET_NAN, IEEE_POSITIVE_INF, \
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IEEE_POSITIVE_NORMAL, \
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IEEE_POSITIVE_DENORMAL, \
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IEEE_POSITIVE_ZERO, *value); \
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\
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if (__builtin_signbit (*value)) \
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{ \
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if (res == IEEE_POSITIVE_NORMAL) \
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return IEEE_NEGATIVE_NORMAL; \
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else if (res == IEEE_POSITIVE_DENORMAL) \
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return IEEE_NEGATIVE_DENORMAL; \
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else if (res == IEEE_POSITIVE_ZERO) \
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return IEEE_NEGATIVE_ZERO; \
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else if (res == IEEE_POSITIVE_INF) \
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return IEEE_NEGATIVE_INF; \
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} \
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\
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if (res == IEEE_QUIET_NAN) \
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{ \
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/* TODO: Handle signaling NaNs */ \
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return res; \
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} \
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\
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return res; \
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}
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CLASSMACRO(4)
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CLASSMACRO(8)
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#define GFC_FPE_ALL (GFC_FPE_INVALID | GFC_FPE_DENORMAL | \
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GFC_FPE_ZERO | GFC_FPE_OVERFLOW | \
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GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT)
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/* Functions to save and restore floating-point state, clear and restore
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exceptions on procedure entry/exit. The rules we follow are set
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in Fortran 2008's 14.3 paragraph 3, note 14.4, 14.4 paragraph 4,
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14.5 paragraph 2, and 14.6 paragraph 1. */
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void ieee_procedure_entry (void *);
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export_proto(ieee_procedure_entry);
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void
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ieee_procedure_entry (void *state)
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{
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/* Save the floating-point state in the space provided by the caller. */
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get_fpu_state (state);
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/* Clear the floating-point exceptions. */
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set_fpu_except_flags (0, GFC_FPE_ALL);
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}
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void ieee_procedure_exit (void *);
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export_proto(ieee_procedure_exit);
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void
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ieee_procedure_exit (void *state)
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{
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/* Get the flags currently signaling. */
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int flags = get_fpu_except_flags ();
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/* Restore the floating-point state we had on entry. */
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set_fpu_state (state);
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/* And re-raised the flags that were raised since entry. */
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set_fpu_except_flags (flags, 0);
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}
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