mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* s_isnanl.c -- long double version for i387 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>
|
|
|
|
int __isnanl(long double x)
|
|
{
|
|
int32_t se,hx,lx;
|
|
GET_LDOUBLE_WORDS(se,hx,lx,x);
|
|
se = (se & 0x7fff) << 1;
|
|
/* The additional & 0x7fffffff is required because Intel's
|
|
extended format has the normally implicit 1 explicit
|
|
present. Sigh! */
|
|
lx |= hx & 0x7fffffff;
|
|
se |= (u_int32_t)(lx|(-lx))>>31;
|
|
se = 0xfffe - se;
|
|
return (int)((u_int32_t)(se))>>16;
|
|
}
|
|
hidden_def (__isnanl)
|
|
weak_alias (__isnanl, isnanl)
|