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/*
* nan () returns a nan.
* Added by Cygnus Support.
*/
/*
FUNCTION
<<nan>>, <<nanf>>---representation of ``Not a Number''
INDEX
nan
INDEX
nanf
SYNOPSIS
#include <math.h>
double nan(const char *<[unused]>);
float nanf(const char *<[unused]>);
DESCRIPTION
<<nan>> and <<nanf>> return an IEEE NaN (Not a Number) in
double- and single-precision arithmetic respectively. The
argument is currently disregarded.
QUICKREF
nan - pure
*/
#include "fdlibm.h"
#ifndef _DOUBLE_IS_32BITS
double nan(const char *unused)
{
double x;
#if __GNUC_PREREQ (3, 3)
x = __builtin_nan("");
#else
INSERT_WORDS(x,0x7ff80000,0);
#endif
return x;
}
#endif /* _DOUBLE_IS_32BITS */