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- /* `NAN' constant for IEEE 754 machines.
- Copyright (C) 1992,1996,1997,1999,2004,2006 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. */
- /*
- * Copied from the common code and modified for TI tool wrapper.
- * Copyright (C) 2010 Texas Instruments Incorporated
- */
- #if __GNUC_PREREQ(3,3)
- # define NAN (__builtin_nanf (""))
- #elif defined __GNUC__ && ! defined __TI_TOOL_WRAPPER__
- # define NAN \
- (__extension__ \
- ((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \
- { __l: 0x7fc00000UL }).__d)
- #else
- # include <endian.h>
- # if __BYTE_ORDER == __BIG_ENDIAN
- # define __nan_bytes { 0x7f, 0xc0, 0, 0 }
- # endif
- # if __BYTE_ORDER == __LITTLE_ENDIAN
- # define __nan_bytes { 0, 0, 0xc0, 0x7f }
- # endif
- static union { unsigned char __c[4]; float __d; } __nan_union
- = { __nan_bytes };
- # define NAN (__nan_union.__d)
- #endif /* GCC. */
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