glibc/sysdeps/x86/fpu/include/bits/fenv.h

/* Wrapper for x86 bits/fenv.h for use when building glibc.
   Copyright (C) 1997-2016 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 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
   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, see
   <http://www.gnu.org/licenses/>.  */

#include_next <bits/fenv.h>

/* Ensure __feraiseexcept calls in glibc are optimized the same as
   feraiseexcept calls.  */

#ifdef __USE_EXTERN_INLINES
__BEGIN_DECLS

extern int __REDIRECT_NTH (____feraiseexcept_renamed, (int), __feraiseexcept);
__extern_inline int
__NTH (__feraiseexcept (int __excepts))
{
  if (__builtin_constant_p (__excepts)
      && (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)
    {
      __feraiseexcept_invalid_divbyzero (__excepts);
      return 0;
    }

  return ____feraiseexcept_renamed (__excepts);
}

__END_DECLS
#endif