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