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Diffstat (limited to 'math/fenv.h')
| -rw-r--r-- | math/fenv.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/math/fenv.h b/math/fenv.h new file mode 100644 index 0000000000..c9a8a5c94b --- /dev/null +++ b/math/fenv.h @@ -0,0 +1,114 @@ +/* Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* + * ISO C 9X 7.6: Floating-point environment <fenv.h> + */ + +#ifndef _FENV_H + +#define __FENV_H 1 +#include <features.h> + +/* Get the architecture dependend definitions. The following definitions + are expected to be done: + + fenv_t type for object representing an entire floating-point + environment + + FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument + to functions taking an argument of type fenv_t; in this + case the default environment will be used + + fexcept_t type for object representing the floating-point exception + flags including status associated with the flags + + The following macros are defined iff the implementation supports this + kind of exception. + FE_INEXACT inxeact result + FE_DIVBYZERO devision by zero + FE_UNDERFLOW result not representable due to underflow + FE_OVERFLOW result not representable due to overflow + FE_INVALID invalid operation + + FE_ALL_EXCEPT bitwise OR of all supported exceptions + + The next macros are defined iff the appropriate rounding mode is + supported by the implementation. + FE_TONEAREST round to nearest + FE_UPWARD round toward +Inf + FE_DOWNWARD round toward -Inf + FE_TOWARDZERO round toward 0 +*/ +#include <fenvbits.h> + +__BEGIN_DECLS + +/* Floating-point exception handling. */ + +/* Clear the supported exceptions represented by EXCEPTS. */ +extern void feclearexcept __P ((int __excepts)); + +/* Store implementation-defined representation of the exception flags + indicated by EXCEPTS in the object pointed to by FLAGP. */ +extern void fegetexceptflag __P ((fexcept_t *__flagp, int __excepts)); + +/* Raise the supported exceptions represented by EXCEPTS. */ +extern void feraiseexcept __P ((int __excepts)); + +/* Set complete status for exceptions inidicated by EXCEPTS according to + the representation in the object pointed to by FLAGP. */ +extern void fesetexceptflag __P ((__const fexcept_t *__flagp, int __excepts)); + +/* Determine which of subset of the exceptions specified by EXCEPTS are + currently set. */ +extern int fetestexcept __P ((int __excepts)); + + +/* Rounding control. */ + +/* Get current rounding direction. */ +extern int fegetround __P ((void)); + +/* Establish the rounding direction represented by ROUND. */ +extern int fesetround __P ((int __round)); + + +/* Floating-point environment. */ + +/* Store the current floating-point environment in the object pointed + to by ENVP. */ +extern void fegetenv __P ((fenv_t *__envp)); + +/* Save the current environment in the object pointed to by ENVP, clear + exception flags and install a non-stop mode (if available) for all + exceptions. */ +extern int feholdexcept __P ((fenv_t *__envp)); + +/* Establish the floating-point environment represented by the object + pointed to by ENVP. */ +extern void fesetenv __P ((__const fenv_t *__envp)); + +/* Save current exceptions in temporary storage, install environment + represented by object pointed to by ENVP and raise exceptions + according to saved exceptions. */ +extern void feupdateenv __P ((__const fenv_t *__envp)); + +__END_DECLS + +#endif /* fenv.h */ |