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47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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/* s_isnanl.c -- long double version for i387 of s_isnan.c.
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* Conversion to long double by Ulrich Drepper,
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* Cygnus Support, drepper@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: $";
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#endif
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/*
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* isnanl(x) returns 1 is x is nan, else 0;
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* no branching!
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*/
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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int __isnanl(long double x)
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#else
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int __isnanl(x)
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long double x;
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#endif
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{
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int32_t se,hx,lx;
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GET_LDOUBLE_WORDS(se,hx,lx,x);
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se = (se & 0x7fff) << 1;
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lx |= hx;
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/* The additional &hx is required because Intel's extended format
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has the normally implicit 1 explicit present. Sigh! */
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se |= (u_int32_t)((lx|(-lx))&hx)>>31;
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se = 0xfffe - se;
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return (int)((u_int32_t)(se))>>16;
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}
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weak_alias (__isnanl, isnanl)
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