-/* Copyright (C) 1997, 1999 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2019 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.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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.
+ Lesser 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. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
/*
* ISO C99 7.6: Floating-point environment <fenv.h>
#ifndef _FENV_H
#define _FENV_H 1
-#include <features.h>
+#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+#include <bits/libc-header-start.h>
/* Get the architecture dependend definitions. The following definitions
are expected to be done:
fexcept_t type for object representing the floating-point exception
flags including status associated with the flags
+ femode_t type for object representing floating-point control modes
+
+ FE_DFL_MODE macro of type pointer to const femode_t to be used as the
+ argument to fesetmode; in this case the default control
+ modes will be used
+
The following macros are defined iff the implementation supports this
kind of exception.
FE_INEXACT inexact result
- FE_DIVBYZERO devision by zero
+ FE_DIVBYZERO division by zero
FE_UNDERFLOW result not representable due to underflow
FE_OVERFLOW result not representable due to overflow
FE_INVALID invalid operation
/* Raise the supported exceptions represented by EXCEPTS. */
extern int feraiseexcept (int __excepts) __THROW;
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Set the supported exception flags represented by EXCEPTS, without
+ causing enabled traps to be taken. */
+extern int fesetexcept (int __excepts) __THROW;
+#endif
+
/* Set complete status for exceptions indicated by EXCEPTS according to
the representation in the object pointed to by FLAGP. */
-extern int fesetexceptflag (__const fexcept_t *__flagp, int __excepts) __THROW;
+extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
/* Determine which of subset of the exceptions specified by EXCEPTS are
currently set. */
extern int fetestexcept (int __excepts) __THROW;
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Determine which of subset of the exceptions specified by EXCEPTS
+ are set in *FLAGP. */
+extern int fetestexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
+#endif
+
/* Rounding control. */
/* Get current rounding direction. */
-extern int fegetround (void) __THROW;
+extern int fegetround (void) __THROW __attribute_pure__;
/* Establish the rounding direction represented by ROUND. */
extern int fesetround (int __rounding_direction) __THROW;
/* Establish the floating-point environment represented by the object
pointed to by ENVP. */
-extern int fesetenv (__const fenv_t *__envp) __THROW;
+extern int fesetenv (const fenv_t *__envp) __THROW;
/* Save current exceptions in temporary storage, install environment
represented by object pointed to by ENVP and raise exceptions
according to saved exceptions. */
-extern int feupdateenv (__const fenv_t *__envp) __THROW;
+extern int feupdateenv (const fenv_t *__envp) __THROW;
+
+/* Control modes. */
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Store the current floating-point control modes in the object
+ pointed to by MODEP. */
+extern int fegetmode (femode_t *__modep) __THROW;
+
+/* Establish the floating-point control modes represented by the
+ object pointed to by MODEP. */
+extern int fesetmode (const femode_t *__modep) __THROW;
+#endif
/* Include optimization. */
#ifdef __OPTIMIZE__
# include <bits/fenvinline.h>
#endif
+/* NaN support. */
+
+#if (__GLIBC_USE (IEC_60559_BFP_EXT_C2X) \
+ && defined FE_INVALID \
+ && defined __SUPPORT_SNAN__)
+# define FE_SNANS_ALWAYS_SIGNAL 1
+#endif
+
#ifdef __USE_GNU
/* Enable individual exceptions. Will not enable more exceptions than