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/* s_isnanl.c -- long double version for i387 of s_isnan.c.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* isnanl(x) returns 1 is x is nan, else 0;
* no branching!
*/
#include <math.h>
#include <math_private.h>
int __isnanl(long double x)
{
int32_t se,hx,lx,pn;
GET_LDOUBLE_WORDS(se,hx,lx,x);
se = (se & 0x7fff) << 1;
/* Detect pseudo-normal numbers, i.e. exponent is non-zero and the top
bit of the significand is not set. */
pn = (uint32_t)((~hx & 0x80000000) & (se|(-se)))>>31;
/* Clear the significand bit when computing mantissa. */
lx |= hx & 0x7fffffff;
se |= (uint32_t)(lx|(-lx))>>31;
se = 0xfffe - se;
return (int)(((uint32_t)(se)) >> 16) | pn;
}
hidden_def (__isnanl)
weak_alias (__isnanl, isnanl)
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