sysdeps/ieee754/ldbl-128/s_isnanl.c

   1 /* s_isnanl.c -- long double version of s_isnan.c.
   2  * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: $";
  18 #endif
  19
  20 /*
  21  * isnanl(x) returns 1 is x is nan, else 0;
  22  * no branching!
  23  */
  24
  25 #include <math.h>
  26 #include <math_private.h>
  27
  28 int __isnanl(long double x)
  29 {
  30         int64_t hx,lx;
  31         GET_LDOUBLE_WORDS64(hx,lx,x);
  32         hx &= 0x7fffffffffffffffLL;
  33         hx |= (u_int64_t)(lx|(-lx))>>63;
  34         hx = 0x7fff000000000000LL - hx;
  35         return (int)((u_int64_t)hx>>63);
  36 }
  37 hidden_def (__isnanl)
  38 weak_alias (__isnanl, isnanl)