glibc/sysdeps/libm-ieee754/s_isnanl.c
Ulrich Drepper 9eb2730eab Update.
1998-02-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/libm-ieee754/s_isnanl.c: Ignore the explicit integer
	bit.
	* sysdeps/libm-ieee754/s_isinfl.c: Likewise.
1998-02-27 10:00:44 +00:00

45 lines
1.0 KiB
C

/* s_isnanl.c -- long double version of s_isnan.c.
* Conversion to long double by Ulrich Drepper,
* Cygnus Support, drepper@cygnus.com.
*/
/*
* ====================================================
* 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"
#ifdef __STDC__
int __isnanl(long double x)
#else
int __isnanl(x)
long double x;
#endif
{
int32_t se,hx,lx;
GET_LDOUBLE_WORDS(se,hx,lx,x);
se = (se & 0x7fff) << 1;
lx |= hx & 0x7fffffff;
se |= (u_int32_t)(lx|(-lx))>>31;
se = 0xfffe - se;
return (int)((u_int32_t)(se))>>16;
}
weak_alias (__isnanl, isnanl)