-/* Copyright (C) 1997, 1999, 2000, 2012 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2020 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ 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
/* 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;
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;
extern int feupdateenv (const fenv_t *__envp) __THROW;
-/* Include optimization. */
-#ifdef __OPTIMIZE__
-# include <bits/fenvinline.h>
+/* 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
+
+
+/* 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