source: trunk/libs/newlib/src/newlib/libm/common/s_nan.c @ 471

/*
 * 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 */