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/*

 * isinff(x) returns 1 if x is +-infinity, else 0;

 *

 * isinf is a <math.h> macro in the C99 standard.  It was previously

 * implemented as isinf and isinff functions by newlib and are still declared

 * as such in <ieeefp.h>.  Newlib supplies it here as a function if the user

 * chooses to use <ieeefp.h> or needs to link older code compiled with the

 * previous <math.h> declaration.

 */

#include "fdlibm.h"

#include <ieeefp.h>

#undef isinff

int

_DEFUN (isinff, (x),

        float x)

{

        __int32_t ix;

        GET_FLOAT_WORD(ix,x);

        ix &= 0x7fffffff;

        return FLT_UWORD_IS_INFINITE(ix);

}

#ifdef _DOUBLE_IS_32BITS

#undef isinf

int

_DEFUN (isinf, (x),

        double x)

{

        return isinff((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */