-/* Copyright (C) 1997-2016 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
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
+ <https://www.gnu.org/licenses/>. */
/*
* ISO C99 7.6: Floating-point environment <fenv.h>
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)
+#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;
currently set. */
extern int fetestexcept (int __excepts) __THROW;
-#if __GLIBC_USE (IEC_60559_BFP_EXT)
+#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;
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