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/* `NAN' constant for IEEE 754 machines. MIPS version.
Copyright (C) 1992-2017 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/>. */
#ifndef _MATH_H
# error "Never use <bits/nan.h> directly; include <math.h> instead."
#endif
/* IEEE Not A Number. */
/* In legacy-NaN mode MIPS has the qNaN and sNaN patterns reversed
compared to most other architectures. IEEE 754-1985 left the
definition of this open to implementations, and for MIPS the top bit
of the mantissa must be SET to indicate a sNaN. In 2008-NaN mode
MIPS aligned to IEEE 754-2008. */
#if __GNUC_PREREQ(3,3)
# define NAN (__builtin_nanf (""))
#elif defined __GNUC__
/* No 2008-NaN mode support in any GCC version before 4.9. */
# define NAN \
(__extension__ \
((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \
{ __l: 0x7fbfffffUL }).__d)
#else
# include <endian.h>
# if __BYTE_ORDER == __BIG_ENDIAN
# ifdef __mips_nan2008
# define __qnan_bytes { 0x7f, 0xc0, 0, 0 }
# else
# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff }
# endif
# endif
# if __BYTE_ORDER == __LITTLE_ENDIAN
# ifdef __mips_nan2008
# define __qnan_bytes { 0, 0, 0xc0, 0x7f }
# else
# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f }
# endif
# endif
static union { unsigned char __c[4]; float __d; } __qnan_union
__attribute__ ((__unused__)) = { __qnan_bytes };
# define NAN (__qnan_union.__d)
#endif /* GCC. */
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